2026-04-05T07:03:13Z https://jurnal.tekmira.esdm.go.id/index.php/imj/oai

oai::article/475 2024-01-11T13:59:43Z imj:APX

Note for Contributor Sumaryadi, Sumaryadi Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-01-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/475 10.30556/imj.Vol15.No1.2012.475 Indonesian Mining Journal; Vol. 15 No. 1 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 1 February 2012 Indonesian Mining Journal; Vol 15 No 1 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 1 February 2012 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/475/1070 Copyright (c) 2017 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/483 2023-07-18T03:49:59Z imj:ART

PRELIMINARY STUDY OF PARTICLE SIZE MEASUREMENT OF FINE PHOSPHATE ROCKS USING DYNAMIC LIGHT SCATTERING METHOD WAHYUDI, AGUS SARIMAN, SARIMAN ROCHANI, SITI phosphate rock particle size analyzer (PSA) dynamic light scattering (DLS) planetary ball mill (PBM) Particle size measurement is an important role in the utilization of phosphate rocks for nanofertilizer. In this study, the phosphate rocks from Wonosari and Ciamis were milled by planetary ball mill (PBM) into submicron size (0.19 μm). Measurements of the submicron size were conducted using a dynamic light scattering (DLS) method, i.e. iluminating. The milled products were also compared to the milled zeolite and bentonite from the same PBM. There is a relationship between the particle milled size and its chemical composition. The correlation is interpreted as the result of different hardness in minerals content. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-07-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/483 10.30556/imj.Vol14.No3.2011.483 Indonesian Mining Journal; Vol. 14 No. 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011; 115 - 122 Indonesian Mining Journal; Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011; 115 - 122 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/483/347 Copyright (c) 2017 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/994 2020-11-24T00:42:12Z imj:ART

DELAY EFFECT OF MUD LOADING TO THE OPEN PIT DESIGN IN TERMS OF MEETING 2018 – A COAL PRODUCTION TARGET CASE STUDY OF PIT XYZ AT SOUTH KALIMANTAN Warda, Karel Lutan Wiyono, Bagus Cahyadi, Tedy Agung Prabowo, Sigit Bagus delay mud loading sequence coal production Mine Planning and Production Based on the 2018, there a mining plan, two temporary sumps, namely the ABC and BCD sumps. They located in a mining sequence pattern. These sumps required a  mud loading process prior to mining the coal below the sequence. The mud loading process is loaded sequentialy. However, the problem occurs when the mud loading process in the ABC sump is delayed, and resulted only 42% of mud production. Such the delay resulted in hindering the mining sequence pattern which forced changes in plans, designs, and decrease of coal production. These condition led to study the cause, impact, and alternative solution of the delay during mud loading process. The method used in this study includes direct observations and data collection of working conditions, equipment capabilities, material properties, and operation timeline. In this study, the statistical analysis is used to determine the cause and effect of delayed mud loading process. A Minex Software is then used to simulate the alternative of redesign the mining sequence pattern. The study found that the delay in mud loading process is due to the external and internal factors, that result in underproduction of coal only 505,833 tons, and delayed of coal production around 64 days. An alternative that can be conducted is to change the direction progress to the area that has low stripping ratio.  Factors that can hinder the progress are need to be considered for anticipating the plan distraction at mid-term-plan. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/994 10.30556/imj.Vol23.No2.2020.994 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 67 - 82 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 67 - 82 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/994/897 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1044 2021-10-30T10:01:55Z imj:ART

STABILITY STUDY OF OPEN MINE SLOPES AT PIT 22 GN PT KITADIN SITE EMBALUT, KUTAI KARTANEGARA REGENCY, EAST KALIMANTAN PROVINCE Deny, Tandidatu T. Hariyadi, Sundek highwall slope stability open mine pit 22 GN coal The stability of slope, both on the slope of work and the final slope, is a very important aspect of slope stability, both on the slope of work and the final slope in open pit mining activities. The inconsistency of the slopes will result in the collapse of rocks around the excavation site. This happens because the condition of the rock when it has not been excavated is generally balanced. However, due to the discontinuous patterns that occur other than naturally and also due to the mining activities such as excavation, blasting and others, cause a reduction in the retaining force of the rock on the slope results in the equilibrium of the force tends to shift and is not balanced. Study of the stability of the open pit highwall slope at PIT 22 GN PT Kitadin Site Embalut, Kutai Kartanegara Regency, East Kalimantan Province was carried out with the aim to know the rock characteristics, to calculate slope geometry stable safety factors, and to recognize the type of landslide using a bishop method. The results of the modeling consist of several heights and slopes, as well as angles that is formed. Section AA’ has a safety factor value of 1.387, section BB has a safety factor of 1.482, section BB' has a safety factor value of 1.390, section DD' has a safety factor value of 1.318, section EE has a safety factor value of 2,381, section FF' has a safety factor value of 2.426, section GG' has a safety factor value of 2.424, section HH 'has a safety factor value of 2.339. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1044 10.30556/imj.Vol24.No1.2021.1044 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 47 - 56 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 47 - 56 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1044/936 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1105 2020-11-24T00:42:12Z imj:ART

THE INFLUENCE OF STEAM DRYING PROCESS ON COMBUSTION BEHAVIOR OF INDONESIAN LOW-RANK COALS Umar, Datin Fatia Suganal, Suganal Monika, Ika Hudaya, Gandhi Kurnia Diniyati, Dahlia low rank coal drying calorific value moisture combustion Steam drying process of the Low Rank Coals (LRCs) has been conducted to produce coal which is comparable with the High Rank Coal (HRC). Characterization of the raw and dried coals was carried out through proximate, ultimate, calorific value, Fourier Transform Infrared (FTIR) spectroscopy and Thermo Gravimetry-Differential Thermal Analysis (TG-DTA) to study the combustion behavior of the coals. This study used Indonesian low rank coals coming from Tabang (TKK coal) and Samurangau (SP coal), East Kalimantan. The results indicate that the calorific value of the dried coals increases significantly due to the decrease in moisture content of the coal. The FTIR spectrums show that the methylene-ethylene (RCH3/CH2) and aromaticity-aliphaticity ratios (Rar/al) of the dried coals increased while the ratio of RCO/ar decreased which reflect that the rank of the coals increased equivalent to the high rank coal (bituminous). Meanwhile, the TG-DTA indicates that the ignition temperature (Tig) and combustion rate (Rmax) of the dried coals increased. This analysis expresses that the dried coals produced by steam drying process have better combustion behavior due to the higher calorific value than those of the raw coals. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1105 10.30556/imj.Vol23.No2.2020.1105 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 105 - 115 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 105 - 115 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1105/898 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1112 2020-11-24T00:42:12Z imj:ART

MAKING A SYNTHETIC ZEOLITE FROM A RESIDUE OF BAUXITE WASHING Hidayat, Kukuh Nur Wahyudi, Agus Husaini, Husaini alumina bauxite reactive silica waste washing bauxite zeolite NaA A zeolite synthetic of NaA type is generally prepared by mixing the alumina and silicate-containing materials (alkali alumino hydro-silicates). The used raw materials include the amorphous solids such as metakaolin, siliceous earth, coal ash, kimberlite waste, alumina trihydrate [Al(OH)3], bauxite, and aluminum metal. Residue of bauxite washing retains a fine texture and contains significant alumina and silica content, namely 30-36% Al2O3 and 10-15% SiO2. Both components are required for making the zeolite NaA . In this research, the zeolite NaA was made by extracting the alumina from residue of bauxite washing with caustic soda, and followed by reacting it with a water glass after through the flushing and washing process. The composition of zeolite NaA is as follows: 33.87% SiO2, 27.63% Al2O3, 16.31% Na2O, and 22.18% H2O with Na96Al96Si96O384.216H2O or Na12(AlO2)12(SiO2)12.27H2O as its mineral composition. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1112 10.30556/imj.Vol23.No2.2020.1112 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 99 - 104 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 99 - 104 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1112/899 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1120 2020-11-24T00:42:12Z imj:ART

APPLICATION OF CUCKOO SEARCH METHOD IN 3D SLOPE STABILITY ANALYSIS FOR LIMESTONE QUARRY MINE Azizi, Masagus Ahmad Marwanza, Irfan Hartanti, Nadya A. Ghifari, Muhammad K. Anugrahadi, Afiat Zulfahmi, Zulfahmi open pit mine limestone slope stability analysis 3D-limit equilibrium method Cuckoo Search Mining geotechnics The Cuckoo Search (CS) is a very fast and efficient global optimization method to locating the slip surface which carried out by iteration. However, the Grid Search (conventional method) method in 3D slope stability analysis takes longer than this method on the computation process. Slope stability analysis was performed using the 3D limit equilibrium method “Bishop” with Cuckoo Search of slip surface by maximizing iteration of the simulation and columns in X or Y. To ensure that the slip surface within the global minimum slip surface, the maximum iteration in CS was also specified from 40 to 1200. Based on maximum columns in X or Y, the safety factor value of the 3D CS results was then compared to the Grid Search results to determine the final 3D safety factor and the estimated volume of potential failure. The final 3D safety factor obtained from the average 3D safety factor (with maximum iteration 400, 800, 1000, and 1200) is about 2,01 with the average estimated volume of slope failure of 190.000 m3 that located at the north of the pit. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1120 10.30556/imj.Vol23.No2.2020.1120 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 57 - 65 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 57 - 65 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1120/900 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1131 2021-10-30T10:01:55Z imj:ART

SHALLOW SEISMIC REFLECTION SURVEY FOR IMAGING DEEP-SEATED COAL LAYER - CASE STUDY FROM MUARA ENIM COAL Ramdhani, Muhammad Rizki Ibrahim, Muhammad Abdurachman Siregar, Hans E. A. Rahadinata, Tony shallow seismic reflection deep-seated coal Muara Enim formation Indonesia has a great potential for deep-seated coal resources. To assist and support the deep-seated coal exploration, a shallow seismic reflection method is applicable for this purpose. This study has conducted a shallow seismic reflection method in Musi Banyuasin Regency, South Sumatera Province. The Muara Enim coal target varies from 100 to 500 meters from the surface. The thickness of the coal layer varies from 2 to 10.65 meters. This study uses 48 channels with 14 Hz single geophone and Mini-Sosie as the energy source. The receiver and source interval is 15 meters. This study uses a fixed receiver and moving source configuration. From the interpreted seismic section, this study identified a deep-seated coal layer target. These layers are Mangus, Burung, Benuang, Kebon and Benakat layers. A simple interpretation is analyzed by combining the seismic amplitude characteristics and the thickness of the coal layer from the borehole data. From the interpreted seismic section, deep-seated coal layer targets have strong amplitude characteristics and are continuous from southwest to the northeast with a down-dip of around 20-30°. This study helps to inform the operator companies who develop the utilization of deep-seated coal (coalbed methane, underground coal gasification and underground coal mining) about the effective and proper geophysical method for imaging deep-seated coal layer. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1131 10.30556/imj.Vol24.No1.2021.1131 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 15 - 29 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 15 - 29 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1131/939 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1132 2020-11-24T00:42:12Z imj:ART

SUBSIDENCE AND HEAT PROPAGATION MODELING ON THE UNDERGROUND COAL GASIFICATION (CASE STUDY AT MUARA ENIM FORMATION, SOUTH SUMATERA) Zulfahmi, Zulfahmi Syafri, Ildrem Abdurrokhim, Abdurrokhim Wattimena, Ridho Kresna numerical modeling subsidence cap rock kaolinite non-kaolinite Modeling and simulation geo-mechanics/geotechnics One of the important issues to study underground coal gasification (UCG) is the prediction of surface subsidence. Several parameters that influence these conditions are the thickness of cap rock, the physical and mechanical characteristics, the structure condition, the minerals composition of the rock, and external conditions. This study had been carried out simulation and modeling to determine the level of surface subsidence risk and the effect of high temperatures due to the activities. The modeling results show that the thickness of the rock above the UCG coal seam greatly affects the surface subsidence. The depth is more than 200 m and found that the SF value is 1.59 which indicates UCG reactor depth of ≥ 200 m is safe from the risk of subsidence. From the characteristic aspect of the cap rock, the claystone types which not contain kaolinite minerals are more prone to collapse than those of contain kaolinite minerals. From this models, the gasifier at 150 m depth was estimated that there will be a decline of -7.23 m, and the minimum subsidence is at 275 m about 0.1 m. The heat propagation modeling results show that at 50 m the temperature is estimated to be 213- 289°C, but if the thickness of the cap rock is > 200 m depth, the temperature is around 29-28°C. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1132 10.30556/imj.Vol23.No2.2020.1132 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 83 - 98 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020; 83 - 98 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1132/901 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1133 2021-10-30T10:01:55Z imj:ART

APPLICATION OF MAGNETIC AND INDUCED POLARIZATION METHOD FOR DELINEATING GOLD-BEARING VEIN ZONES AT CIBALIUNG, PANDEGLANG REGENCY, BANTEN Sidiq, Muhammad Yatini, Y. Fajrin, Agus hydrothermal alteration gold mineralization susceptibility resistivity chargeability Magmatic processes occurred during the Miocene period caused the formation of epithermal gold deposits in Cibaliung area. The deposit has previously been investigated through geological surveys which basically only covers the surface aspect, so in this study a subsurface analysis was carried out through magnetic and IP surveys to determine the distribution and continuity of the gold deposits. The magnetic survey was conducted over an area of about 3 km2 with sampling interval 20 m east and 100 m north. The magnetic data were processed using Oasis Montaj with magnetic intensity map as an output, which was then interpreted to determine the presence of structures and magnetite destruction zones as mineralization clues. The IP survey was conducted on 20 east-west oriented lines with length of about 1.2 km. The electrode configuration used is Wenner with 25 m spacing. IP data were processed using RES2DINV software to eliminate bad datum points and invert the apparent chargeability values into the true ones. IP data are then interpreted to clearly determine the position, direction, and distribution of gold mineralization body by detecting the presence of sulfide minerals as ligands carrying gold. Magnetic data analysis shows that gold mineralization tends to occur at low magnetic anomaly, ranging from 37 nT to 240 nT and generally associated with northwest-oriented structures. The mineralization zone is found in four main vein zones with resistivity and chargeability values < 51  and > 50 ms. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1133 10.30556/imj.Vol24.No1.2021.1133 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 1 - 14 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 1 - 14 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1133/937 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1148 2020-11-24T00:42:12Z imj:CVR

Front Cover Wayudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1148 10.30556/imj.Vol23.No2.2020.1148 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1148/902 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1149 2020-11-24T00:42:12Z imj:CVR

Table of Content Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1149 10.30556/imj.Vol23.No2.2020.1149 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1149/903 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1150 2020-11-24T00:42:12Z imj:CVR

From the Editor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1150 10.30556/imj.Vol23.No2.2020.1150 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1150/904 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1151 2020-11-24T00:42:12Z imj:CVR

Abstract Index Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1151 10.30556/imj.Vol23.No2.2020.1151 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1151/905 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1152 2020-11-24T00:42:12Z imj:APX

Note for Contributor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1152 10.30556/imj.Vol23.No2.2020.1152 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1152/906 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1153 2020-11-24T00:42:12Z imj:APX

Back Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2020-11-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1153 10.30556/imj.Vol23.No2.2020.1153 Indonesian Mining Journal; Vol. 23 No. 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 Indonesian Mining Journal; Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1153/907 Copyright (c) 2020 Indonesian Mining Journal

oai::article/1173 2021-10-30T10:01:55Z imj:ART

LITHOGEOCHEMICAL EXPLORATION FOR DELINEATING PRIMARY GOLD OCCURRENCES IN WEST KAO AREA, NORTH HALMAHERA DISTRICT, NORTH MALUKU PROVINCE Idrus, Arifudin Fadlin, Fadlin BLEG exploration geochemical anomaly Halmahera Halmahera Island retains several gold deposits. One of the gold deposits is called as low sulphidation epithermal (LSE) quartz veins which is currently being mined and is situated in the Gosowong goldfield. The veins mostly originated in N-S and NNE-SSW direction. This study is aimed to determine the prospect area in the northern portion of Gosowong goldfield covering the West Kao sub district based on surface mapping and rock/float- and BLEG stream sediment survey. A total of 16 rock/vein float and 120 BLEG samples were analyzed by FA/AAS and CNO2 cyanide leach methods, respectively. The study area is occupied by tuffaceous sandstone, andesite, porphyritic andesite and lava andesite units. In the eastern part, tuffaceous sandstone is suffered from argillic and propylitic alteration, which may be controlled by the NW-SE-trending structures. The gold grade of rock/float samples is up to 0.044 ppm. BLEG data indicates a calculated threshold of 10 ppb for Au and 72 ppb for Ag. The highest Au and Ag contents (anomalies) are identified in the eastern part of the study area. This is spatially (and maybe genetically) related to the argillic-altered tuffaceous sandstone, structures and occurrences of quartz vein floats. To follow up this finding, a detailed exploration is recommended to be conducted within the prospect area. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1173 10.30556/imj.Vol24.No1.2021.1173 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 31 - 45 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 31 - 45 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1173/938 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1192 2021-10-30T10:01:55Z imj:ART

ANALYSIS OF POTENTIAL ENERGY AND ENVIRONMENTAL IMPACT FROM COAL GASIFICATION THROUGH SIMULATION OF PLASMA GASIFICATION PROCESS OF INDONESIAN LOW-RANK COAL Sesotyo, Priyo Adi Nur, Muhammad Muraza, Oki plasma gasification environmental impact low-rank coal syngas energy potential New Energy Indonesia's coal reserve is abundant with its lower price and widely distributed than oil and natural gas. However, the coal emits high carbon dioxide gas (CO2) and sulfur compounds (H2S, SOx) to the environment during utilization. Plasma gasification can overcome those lacks using the external electric energy through a plasma torch. The chemical properties of coal have impacts on the energy content and environmental benchmarking. Using steam as a gasifying agent should be adequate to produce H2 and CO syngas. A research has been carried out to analyze and understand the benefit of using different gasifying agent for maximizing the H2 production and minimizing the environmental impact. Pure Steam (PS) gasifying agent to coal ratio of 0.4 has shown 43.76% H2 composition in syngas and cold gasification efficiency (CGE) with 37.71%. The PS to coal ratio of 0.2 has a significant carbon conversion efficiency of 4.75% and the PS to coal ratio of 0.6 has a gross energy potential of 86.5 kW. Using such the PS is significantly better than the mixture of steam oxygen (SO) as the gasifying agent since it needs to have a greater SO flow rate to have the SO to coal ratio of 1.00. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1192 10.30556/imj.Vol24.No1.2021.1192 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 57 - 70 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021; 57 - 70 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1192/940 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1216 2021-12-08T08:39:58Z imj:ART

EFFECT OF SULFUR IN THE REDUCTANTS ON SULFIDATION MECHANISM OF NICKEL LATERITE Nurjaman, Fajar Sari, Yuliana Handoko, Anton Sapto Bahfie, Fathan Herlina, Ulin Miftahurrahman, Muhammad Priadi, Dedi Ferdian, Deni Suharno, Bambang selective reduction nickel laterite reductant sulfur ferronickel nickel laterite processing (pyrometallurgy) Processing nickel laterite conventionally, namely by pyrometallurgy method, requires high temperature and energy, results in a costive process. Due to its lower temperature reduction process, selective reduction with additives could be an alternative in nickel ore processing. Additives such as sulfur/sulfate have a critical role in promoting the low melting point phase. Sulfur is also found in coal. Therefore, it is important to investigate the effect of sulfur content in reductant on selective reduction of lateritic nickel ore. In this work, the effect of sulfur content (2.68% and 5% S) in anthracite coal as a reductant on selective reduction of limonitic ore was studied clearly. Nickel ore, reductant and sodium sulfate were mixed homogenously and pelletized up to 10-15 mm in diameter. Pellets were reduced using a muffle furnace at 950 to 1150°C for 60 min. Reduced pellets were crushed into -200 mesh before separating the ferronickel and its impurities using a wet magnetic separation process. The result showed that the anthracite coal with 5% S produced concentrate containing 3.56% Ni with 95,97% recovery, which is higher than 2.68% S. The sulfur content in reductant could replace the addition of sulfur/sulfate as the additives in the selective reduction of lateritic nickel ore. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1216 10.30556/imj.Vol24.No2.2021.1216 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 93-103 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 93-103 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1216/946 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1217 2021-12-08T08:39:58Z imj:ART

THE APPLICATION OF FAILURE METHOD PROBABILITY FOR ANALYZING IN PIT DUMP STABILITY AT WEST BLOCK ‘X’ PIT PT BERAU COAL - EAST KALIMANTAN Adriansyah, Yan Saprana, Rifqi Dwi Sophian, Irvan Khoirullah, Nur In-pit probabilistic probability of failure safety factor syncline West Block 'X' pit is one of the coal mining locations operated by the Lati Mine Operation – PT Berau Coal. Administratively, the Lati Mine is located as part of Berau Regency – East Kalimantan. The study area is located at the north side of the concession, in a syncline fold structure zone. The disposal design in this area needs to special attention from slope stability aspect due it is located on the wing of a mega syncline with a certain slope and constituent of unconsolidated materials. The pit design needs to be stable. The purpose of this study is to determine the level of stability of the in-pit dump by analyzing the current in-pit dump stability based on the value of the safety factor (FS) and the probability of failure (PoF). The method used in this study is a probabilistic analysis of slope stability based on the Morgenstern-Price method to obtain the value of the safety factor and the probability of failure. The study results show that the slope is in the safe category (stable slope) in the range of PoF values 0 – 1%, marginal slope 1 – 12%, and unstable slope above 12%. Based on such as results, it is necessary to modify the slope geometry categorized as unstable to carry out mine operation safely underneath the toe of slope. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1217 10.30556/imj.Vol24.No2.2021.1217 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 71-83 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 71-83 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1217/950 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1234 2021-12-08T08:39:58Z imj:ART

EFFECT OF LOW RANK COAL TEMPERATURE AND MOISTURE CONTENT ON SLOW PYROLYSIS PROCESS Handoko, Slamet Rianda, Sapta Nurhadi, Nurhadi slow pyrolysis water content temperature char quality char energy content coal process The government of Indonesia has made policies to increase the added value of coal. It can be completed using technology of slow pyrolysis. This study aimed to increase the added value of coal by analyzing the effect of temperature and water content of the feed on slow pyrolysis products. Water content variation in the feed form of coal was 10.57 wt% and 16.86 wt%. Temperature variations in the slow pyrolysis process were 500, 600, 700, and 800 ºC. Result of this research showed that the low moisture content of coal produced more char in the slow pyrolysis process. Based on the variations of the used temperature, a higher temperature of pyrolysis produced fewer char but its calorific value of coal product was also higher. The optimum operating condition was achieved at 500-600 ºC. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf application/vnd.openxmlformats-officedocument.wordprocessingml.document https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1234 10.30556/imj.Vol24.No2.2021.1234 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 105-111 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 105-111 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1234/947 https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1234/1018 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1235 2021-12-08T08:39:58Z imj:ART

GROWTH AND PRODUCTION OF TEA PLANT (Camellia sinensis (L.) O Kuntze) AFTER PRUNING WITH BIO-ORGANOMINERAL AMELIORANT Wulansari, Restu Athallah, Faris Nur Fauzi Pranoto, Eko Maryono, Maryono Darmawan, Didit Adi Supriyanto, Budhy Agung bio-organomineral plant health shoot production tea plant West Java Tea plant (Camellia sinensis (L.) O Kuntze) is one of the important plantation commodities that has long been cultivated in Indonesia. Mineral based ameliorant fertilization is one of the important factors to produce high productivity and maintenance of healthy plants. Ameliorant bio-organomineral (BIOM) is a fertilizer that utilizes mineral resources, potential microbes, and organic matter. This study aimed to determine the effect of BIOM's ameliorant on plant health and tea productivity after pruning. The Randomized Block Design (RBD) was accomplished by 8 treatments and three replications (100% conventional fertilizer, 100% BIOM, 80% single fertilizer + 100% BIOM, 80% conventional fertilizer + 80% BIOM, 80% conventional fertilizer + 60% BIOM, 60% conventional fertilizer + 100% BIOM, 60% conventional fertilizer + 80% BIOM, and 60% conventional fertilizer + 60% BIOM). The results showed that there was a significant effect of the combination of conventional fertilizer and BIOM ameliorant on shoot production and pekoe percentage, but not significantly different in tipping production, pekoe shoot ratio and banji shoots. The combination of 60% conventional fertilizer and 60% BIOM showed the highest total production of 31.81 kg/plot. Shoot production in the BIOM treatment was 17.36% higher than that of the conventional fertilizer application. The application of BIOM ameliorant was able to improve the plant health after pruning on the GMB 7 clone. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1235 10.30556/imj.Vol24.No2.2021.1235 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 85-92 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 85-92 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1235/948 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1236 2021-10-30T10:01:55Z imj:CVR

Table of Content Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1236 10.30556/imj.Vol24.No1.2021.1236 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1236/941 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1237 2021-10-30T10:01:55Z imj:CVR

From the Editor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1237 10.30556/imj.Vol24.No1.2021.1237 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1237/942 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1238 2024-01-11T14:04:00Z imj:CVR

Abstract Index Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1238 10.30556/imj.Vol24.No1.2021.1238 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1238/1071 Copyright (c) 2021 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/1239 2021-10-30T10:01:55Z imj:APX

Note for Contributor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1239 10.30556/imj.Vol24.No1.2021.1239 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1239/943 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1240 2021-10-30T10:01:55Z imj:CVR

Front Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1240 10.30556/imj.Vol24.No1.2021.1240 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1240/944 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1241 2021-10-30T10:01:55Z imj:APX

Back Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-10-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1241 10.30556/imj.Vol24.No1.2021.1241 Indonesian Mining Journal; Vol. 24 No. 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 Indonesian Mining Journal; Vol 24 No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1241/945 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1242 2021-12-08T08:39:58Z imj:ART

STUDY ON CHEMICAL CHARACTERISTICS OF COAL AND BIOMASS BLEND AND THE TENDENCY OF ITS ASH DEPOSITION Umar, Datin Fatia Rohayati, Taty biomass proximate ultimate slagging fouling A coal and biomasses of empty fruit bunch (EFB), mesocarp fiber (MF) and palm kernel shell (PKS) were characterized in terms of its proximate, ultimate, calorific value and ash chemical composition. Ash fusion temperature (AFT) was carried out on coal and biomass blends with a composition in weight % of 95-5; 90-10 and 85-15. The coal used in this research has high calorific value of 6,106 cal/g. Results indicate that based on the AFT, the coal-biomass blends at some composition shows a medium tendency to ash deposition. While based on the chemical composition, generally the coal-biomass blends have a low tendency to slagging but have a high tendency to fouling. Coal-biomass blend at the coal composition of 85 wt% and PKS of 15 wt% (85-15) is recommended to be applied. The less the coal is used, the less the CO2 emission, so it is expected to reduce the GHG significantly. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1242 10.30556/imj.Vol24.No2.2021.1242 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 113-126 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021; 113-126 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1242/949 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1251 2021-12-08T08:39:58Z imj:CVR

Front Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1251 10.30556/imj.Vol24.No2.2021.1251 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1251/951 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1252 2021-12-08T08:39:58Z imj:CVR

Table of Contents Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1252 10.30556/imj.Vol24.No2.2021.1252 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1252/952 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1253 2021-12-08T08:39:58Z imj:CVR

From the Editor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1253 10.30556/imj.Vol24.No2.2021.1253 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1253/953 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1254 2021-12-08T08:39:58Z imj:CVR

Abstract Index Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1254 10.30556/imj.Vol24.No2.2021.1254 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1254/954 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1255 2021-12-08T08:39:58Z imj:APX

Note for Contributor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1255 10.30556/imj.Vol24.No2.2021.1255 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1255/955 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1256 2021-12-08T08:39:58Z imj:APX

Back Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2021-12-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1256 10.30556/imj.Vol24.No2.2021.1256 Indonesian Mining Journal; Vol. 24 No. 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 Indonesian Mining Journal; Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1256/956 Copyright (c) 2021 Indonesian Mining Journal

oai::article/1260 2022-07-05T10:32:59Z imj:ART

EFFECT OF VACUUM RESIDUE AND PETROLEUM BENZINE AS THE ADDITIVE CALORIFIC VALUE AND MOISTURE OF COAL Putri, Ezra Bella Ramadhani Zahar, Wahyudi Marlinda, Lenny coal upgrading additives coal moisture content calorific value Upgrading the coal is a process that increases the calorific value of low-rank coal through decreasing the moisture content of the coal. This method usually uses mixed heavy oil to close the opened pores after coal upgrading. The additives have a molecule structure like heavy oil. The aim of this study is to determine the effect of additives on the moisture content and calorific value after coal upgrading process. Coal upgrading in this study applies several variations i.e., coal particle size and coal mass mixed with an additive which is a mixture of vacuum residue and petroleum benzine with a ratio of  0.005 g: 1 mL as a coater. Before upgrading process, the moisture content and calorific value of the coal is 13.39 %adb and 6,663 cal/g db. After the process, the lowest moisture content of the coal in the ratio of coal (b/v) and additives was 4:3 with 21.75% ad. The highest calorific value of the coal was shown in the ratio of coal (b/v) and additives 1:1 with 7,189 kcal/kg. The lowest moisture content is indicated by the particle size of -120 mesh. The highest calorific value of coal is shown by the particle size of -120 mesh. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1260 10.30556/imj.Vol25.No1.2022.1260 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 41-47 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 41-47 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1260/980 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1261 2022-12-19T12:19:02Z imj:ART

DEVELOPMENT OF LATERITE ORE PROCESSING AND ITS APPLICATIONS Bahfie, Fathan Manaf, Azwar Astuti, Widi Nurjaman, Fajar Prastyo, Erik Herlina, Ulin nickel bioleaching nickel laterite ore hydrometallurgy pyrometallurgy Nickel ore is found in two types sulfide and laterite. The sulfide is a nickel ore that has high nickel content and low reserves of natural resources than of the zinc laterite. In contrast, the laterite is a rock mineral that contains the iron-nickel oxide compounds. There are two methods of processing nickel laterite, namely hydrometallurgy and pyrometallurgy. The former is a method that uses leaching by a chemical solution or solid such as acid, as a reducing agent. The alkaline leaching (ammonia) is the most optimal method to obtain a nickel grade with the highest recovery but it needs more modification. Pyrometallurgical method uses high heat up to 1800°C, so it requires a lot of energy and needs improvement to decrease the carbon usage. The rotary kiln-electric furnace method is the optimal method for developing the nickel laterite. These methods generate products that can be applied to various fields. For example, the pyrometallurgy method produces nickel pig iron and ferronickel as raw materials for stainless steel and steel alloys. The hydrometallurgy method produces nickel sulfate and nickel oxide with a purity of 99% by weight as raw materials for magnets, sensors, and batteries. Hence, the hydrometallurgy method still needs improvements for the environmentally friendly reagent. Therefore, bioleaching will be a nickel laterite leaching process in the future by using bacteria as the reducing agent. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1261 10.30556/imj.Vol25.No2.2022.1261 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 89 - 104 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 89 - 104 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1261/1004 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1271 2025-11-05T04:33:07Z imj:ART

IMPACT OF ILLEGAL GOLD MINING IN JAMBI, INDONESIA Wibowo, Yudha Gusti Ramadan, Bimastyaji Surya Maryani, Anis Tatik Rosarina, Desy Arkham, La Ode illegal mining social-economy impact environmental impact Environmental mine Illegal gold mining caused various environmental damages in the world. Indonesia is one of the countries with abundant mineral reserves, especially Jambi Province. Jambi has much of natural resources, such as coal and gold. Unfortunately, the management of these natural resources has not been appropriately managed, which has resulted in much illegal gold mining. Illegal mining activities have caused environmental damage, mainly decreased water quality and changed landscapes. This paper explains the illegal mining activities at Jambi Province, including its history, socio-economic and environmental impacts, as well as recent technologies to reduce the environmental damage. Quantitative and qualitative methods were used in this research, including interviews, questionnaires, and laboratory measurements. The results showed that the people of Sarolangun, Bungo, and Tebo were aware that their illegal gold mining activities caused environmental damage. However, economic conditions and insufficient employment opportunities made unlawful gold miners have no other choice. Illegal gold mining activities have also shifted people's livelihoods who previously worked as farmers. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1271 10.30556/imj.Vol25.No1.2022.1271 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 29-40 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 29-40 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1271/982 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1279 2022-07-05T10:32:59Z imj:ART

GEOTECHNICAL STUDY FOR ANALYZING SLOPE STABILITY BETWEEN TWO MINING PIT BOUNDARY Zulfahmi, Zulfahmi production pit boundary slope stability numerical modeling Geotechnics This paper is a new concept to increase the safety and mining conservation on PT-X and PT-Y with no boundary gap between the two areas. To optimize coal recovery as a basis of supporting conservation, the two companies needed to adjust coal production in terms of avoiding technical problems at the mining time process due to the rock structure and coal seam at the border were the same. PT-X plans to produce 2 million tons of coal, but the government only approved 1 million tons, while PT-Y still approved 2 million tons. This paper discusses the instability of mining in border locations due to the differences of coal production. The applied methodology is conducting geotechnical modeling by considering statistical aspects of data distribution and the probability of failure. Based on the results of geotechnical modeling by numerical methods on the basis of 2D and 3D for the difference in the production level of 1 million tons in all cross-sections, the FK value is 0.992 - 1.248 with a probability of failure (PI) of 5.40 - 48.00%. Results of modeling analysis show that both single and overall slopes are at a critical level and are not safe. If this difference is narrowed by increasing PT-X's coal production by 1.5 million tons, the border location's mining conditions will stabilize. Therefore, it is necessary to propose to the government for PT-X's coal production to be added by at least 500.000 tons so that the production process of each company runs safely. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1279 10.30556/imj.Vol25.No1.2022.1279 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 1-11 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 1-11 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1279/984 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1281 2022-12-20T11:51:29Z imj:ART

THE EFFECT OF USING CACO3 AND LIME GLASS IN THE PROBABILITY OF PORE STRUCTURE FORMING ON A CERAMIC GLASS BASED ON SCORIA BASALT ROCKS Birawidha, David Candra Hendronursito, Yusup Isnugroho, Kusno Amin, Muhammad Handoko, Anton Sapto Nuringjati, Sentausa Syafriadi, Syafriadi Basalt CaCO3 foam glass foam agent light-material. Mineral With the development of technology lately, the technology for making lightweight materials is also growing, where the goal is to reduce the total weight of the material without reducing its mechanical strength. Several parameters that influence the manufacture of lightweight materials are the number of pores, materials weight, and physical resistance. One commonly used method is mixing ceramic glass with a foaming agent. In this study, basalt rock from East Lampung, Indonesia, and lime glass was used as a ceramic glass material mixed with CaCO3, which melted down at a temperature of 1200 0C. Variations in composition were carried out by mass comparison between basalt and lime glass, namely A sample (100:0), B sample (70:30), C sample (50:50), and D sample (30:70) with 50%wt CaCO3 added for each sample and heated up to 1200 0C. Treatment variations (annealed and normalized) are also applied to see the phenomena occur. Based on the characterization results, the best sample obtained is in B sample with normalized treatment, whose has porosity value of 53.2% and density value of 1.08 gr/cm3. Based on the results of the SEM test, the pores with a size ≤ 0.5µm are 95%, and ≥ 0.5µm are 5%, where the crystals formed are pyroxene and calcite with the compositions of CaO and SiO2, respectively 39.46% and 41.90%. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1281 10.30556/imj.Vol25.No2.2022.1281 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 105 - 113 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 105 - 113 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1281/1005 Copyright (c) 2022 Jurnal Teknologi Mineral dan Batubara

oai::article/1282 2022-07-05T10:32:59Z imj:ART

BIO-ORGANO MINERAL EFFECT ON SOIL FERTILITY, NUTRIENT UPTAKE, AND SWEET CORN (Zea mays L. saccharata) GROWTH PLANTED IN INCEPTISOLS SOILS Wulansari, Restu Maryono, Maryono Darmawan, Didit Adi Athallah, Faris Nur Fauzi Hakim, Fardian Khairul bio-organomineral nutrient uptake soil fertility sweet corn Sweet corn (Zea mays L. saccharata) is a horticultural product widely consumed by Indonesian people because of its sweetness. Corn requires sufficient nutrients to grow and produce the optimal yield so that the fertilization is a determining factor in corn cultivation. Bio-organomineral fertilizer (BIOM) is a fertilizer that combines mineral, organic, and biological elements (microorganisms). This study aims to examine the effect of BIOM on growth of sweet corn, nutrient uptake, and soil fertility. Experimental design used in this research was Randomized Block Design (RBD) with nine treatments and three replications which consist of treatments control; 1 NPK; ½ BIOM; 1 BIOM; 1 NPK + ½ BIOM; 1 NPK + ¾BIOM; 1 NPK + 1 BIOM; ¾NPK + 1¼BIOM; and ¾NPK + 1½BIOM. Effect of BIOM fertilizer at 100% dosage significantly increased the plant height, stem diameter, and canopy diameter compared to the control. BIOM fertilizer had a significant effect on the N uptake, total N, P-potential, P-available, K-potential, and K- exchangeable. The fertilizer is able to provide positive results on the growth of sweet corn, so it’s more effective for the availability of nutrients needed by sweet corn plants. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1282 10.30556/imj.Vol25.No1.2022.1282 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 49-58 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 49-58 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1282/983 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1283 2022-12-19T12:19:02Z imj:ART

GIS APPLICATION FOR MONITORING THE MINE AREAS Weningsulitri, Weningsulitri Damayanti, Retno Masduki, Tri Widarti Sulistyowati, Jeani Lutfi, Muhamad Sirait, Bagaraja geographical information system satellite imagery environmental monitoring coal mine Technology development is growing fast, such as satellite imagery and GIS for various applications, one of them is mining technology. Several regulations for the mining sector regarding the mandatory use of satellite imagery have been stated in some regulations to be implemented in mining sectors. Some mine environmental studies showed that the remote sensing and the GIS analysis could detect the small changes in its environment area with effective cost as the coverage of the sensory images is quite broad. The purpose is to monitor land alteration by observing the changes at the taking place, in either the number of voids or their area, using the 2019 and 2020 SPOT 6/7 image data. The algorithm change detection analyzes the number and void changing, mainly to provide a visual description of the void image trend and other applications. The trend of void numbers and its area can be predictable and correlated with the coal mine activities yearly. The results of 2019 SPOT 6/7 image showed that the total area of coal mine pit increased from 2% of the total area of the IUP to 2.53% in 2020. But, its allegation of environmental changes due to the mining activities will be strengthened by a ground check survey that cannot be conducted now. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1283 10.30556/imj.Vol25.No2.2022.1283 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 77 - 88 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 77 - 88 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1283/1006 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1285 2023-05-22T06:20:16Z imj:ART

EXPLORATION OF INDIGENOUS ARBUSCULAR MYCORRHIZAL FUNGI ON ARENGA PINNATA MERR IN POST-MINING LAND EKSPLORASI FUNGI MIKORIZA ARBUSKULA INDIGENOS PADA ARENGA PINNATA MERR DI LAHAN PASCATAMBANG Samal, Shaleha Istiqamah Mansur, Irdika Junaedi, Ahmad indigenous AMF revegetation root colonization spores sugar palm plant FMA indigenos revegetasi kolonisasi akar spora aren Mining activities have a positive impact that can generate income for the state, but the activities also cause negative impacts in the form of soil damage, vegetation and animal losses to disrupt the ecosystems. Therefore, it is necessary to carry out a reclamation with revegetation using local plant species. PT Berau Coal has conducted revegetation using a local sugar palm plant (Arenga pinnata). The success of sugar palm plant growth in post-mining reclamation land is influenced by several factors, one of it is the symbiosis of the arbuscula mycorrhizal fungi (AMF) with the sugar palm planted by PT Berau Coal. The purpose of this study was to determine the diversity of indigenous spores in the arenga rhizosphere and root colonization of sugar palm plants. Identification of the AMF diversity was carried out by observing the soil taken from the palm rhizosphere with a depth of 0-20 cm and 20-40 cm. Isolation of spores using the wet pouring technique method with centrifuges and AMF spores were identified using the INVAM methods. The observation of AMF colonization on plant roots was carried out through the root staining technique with the Clapp modification method. The results showed that the AMF spores were found in 3 AMF genera at the observation site, namely genus Glomus (15 sp), Acaulospora (3 sp), and Gigaspora (1 sp). The highest spore abundance is genus Glomus sp at a soil depth of 0-20 cm. The AMF structures found colonizing the roots of sugar palm plants are hyphae, vesicles, and spores. Kegiatan pertambangan memiliki dampak positif yang dapat menghasilkan pendapatan bagi negara, namun juga menimbulkan dampak negatif berupa rusaknya tanah, hilangnya vegetasi dan satwa hingga mengganggu ekosistem, oleh karena itu perlu dilakukan reklamasi dengan revegetasi menggunakan jenis tanaman lokal. PT Berau Coal telah melakukan revegetasi menggunakan tanaman lokal aren (Arenga pinnata). Keberhasilan pertumbuhan tanaman aren pada lahan reklamasi pascatambang dipengaruhi oleh beberapa faktor, salah satunya adalah adanya simbiosis fungi mikoriza arbuskula (FMA) dengan tanaman aren yang ditanam oleh PT Berau Coal. Tujuan penelitian ini adalah untuk mengetahui keanekaragaman spora indigenous pada rizosfer aren dan kolonisasi akar pada tanaman aren. Identifikasi keanekaragaman FMA dilakukan pengamatan pada tanah yang diambil dari rizosfer aren dengan kedalaman 0-20 cm dan 20-40 cm. Isolasi spora menggunakan metode teknik tuang saring basah dengan sentrifugase dan spora FMA diidentifikasi dengan metode INVAM. Pengamatan kolonisasi FMA pada akar tanaman dilakukan melalui teknik pewarnaan akar (staining) dengan metode modifikasi Clapp. Hasil penelitian menunjukkan bahwa spora FMA yang ditemukan di lokasi pengamatan ada 3 genus FMA yaitu Glomus (15 sp), Acaulospora (3 sp) dan Gigaspora (1 sp) dengan kelimpahan spora terbanyak adalah genus Glomus sp pada kedalaman tanah 0-20 cm. Struktur FMA yang ditemukan mengkolonisasi akar tanaman aren adalah hifa, vesikula dan spora. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1285 10.30556/imj.Vol26.No1.2023.1285 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023; 39-47 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023; 39-47 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1285/1030 Copyright (c) 2023 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/1288 2022-07-05T10:32:59Z imj:ART

OVERVIEW ON AN OPEN PIT MINE PLANNING OF THE PICKSTONE PEERLESS IN A VOLATILE ENVIRONMENT Ngoroyemoto, Tapiwa Frank Kwachara Chewu, Charles Runganga, Desire Nyamagudza, Tatenda Sabao, Ashley Ruvimbo availability environment mining scheduling volatile The prevailing mining climate is highly characterized by unstable consumables pricing systems, a volatile economy and skyrocketing operational costs, and exacerbated by a steady decline and intermittence in the availability of electricity. Zimbabwean mines need to extensively capitalize on the opportunity to improve productivity by emphasizing variables they can control, predominantly operational efficiency to avoid resizing of operations or facilitating downsizing by relatively insignificant factors. In this study, cycle times, rig penetration, utilization, availability and payloads were used to evaluate the mining cycles, operator costs and the information was compared against the life of mine plans with block models. Shifts were restructured to be concordant to the schedule provided by the utility company to save fuel that was being used to power metallurgical plant. Several challenges have been identified as the principal reasons behind discrepancies between the theoretical capabilities of equipment were proven to be achievable by a trial schedule which reduced the 7 days/month to less than 2 days a month. The new schedule reflects a theoretical improvement of close to 25% and significantly lower operational costs. The current mining fleet is capable of meeting the stipulated targets and even achieving more even within tough working environments characterized by harsh load shedding schedules and volatile inflation rates; however, this requires stringent monitoring and evaluation of unit process. By adopting the recommended short term production plans will avoid resizing of operations as it automatically reduces the operational costs by US $3 million annually whilst coercing both operators and management to improve their operational efficiency. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1288 10.30556/imj.Vol25.No1.2022.1288 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 13-27 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022; 13-27 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1288/979 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1301 2023-05-22T06:20:16Z imj:ART

LEACHING OPTIMIZATION OF MANGANESE ORE FROM NORTH CENTRAL TIMOR USING H2O2 AS A REDUCING AGENT OPTIMALISASI PELINDIAN BIJIH MANGAN ASAL TIMOR TENGAH UTARA MENGGUNAKAN H2O2 SEBAGAI PEREDUKSI Abi, Faustina De Yesu Prisila Tjahjanto, Rachmat Triandi Prananto, Yuniar Ponco hydrometallurgy leaching manganese ore peroxide sulfuric acid hidrometalurgi pelindian bijih mangan peroksida asam sulfat Optimization of manganese ore leaching process from North Central Timor, Indonesia has been investigated. The final product of the leaching process was MnSO4. Variables that were optimized during the process were volume of H2O2, reaction temperature, and reaction time. The final products were characterized by FTIR, powder-XRD, XRF, and AAS. Experimental data shows that the optimum conditions for the leaching process were 50 mL H2SO4 4 M, 25 mL H2O2 2 M, in which the reaction was done at room temperature for two hours. This optimum condition resulting in 38.2% of Mn extraction with 96.88% purity. Based on powder-XRD, the products were a mixture of crystalline MnSO4.4H2O, MnSO4.5H2O and [NH4]8[Mn8(SO4)12]. Penelitian optimalisasi proses pelindian bijih mangan dari Timor Tengah Utara, Indonesia telah dilakukan. Produk akhir proses pelindian berupa MnSO4. Variabel yang dioptimalkan selama proses pelindian adalah volume H2O2, suhu reaksi, dan waktu reaksi. Produk akhir dikarakterisasi dengan FTIR, powder-XRD, XRF dan AAS. Data hasil penelitian menunjukkan bahwa kondisi optimum proses pelindian untuk mendapatkan MnSO4 adalah 50 mL H2SO4 4 M, 25 mL H2O2 2 M, dan reaksi dilakukan pada suhu ruang selama dua jam. Kondisi optimum ini menghasilkan ekstrasi Mn sebesar 38,2% dengan kemurnian 96,88%. Berdasarkan analisis powder-XRD, produk yang dihasilkan adalah campuran kristal MnSO4.4H2O, MnSO4.5H2O and [NH4]8[Mn8(SO4)12]. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1301 10.30556/imj.Vol26.No1.2023.1301 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023; 19-27 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023; 19-27 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1301/1027 Copyright (c) 2023 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/1317 2022-07-05T10:32:59Z imj:CVR

Front Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1317 10.30556/imj.Vol25.No1.2022.1317 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1317/985 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1318 2022-07-05T10:32:59Z imj:CVR

Table of Content Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1318 10.30556/imj.Vol25.No1.2022.1318 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1318/986 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1319 2022-07-05T10:32:59Z imj:CVR

From the Editor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1319 10.30556/imj.Vol25.No1.2022.1319 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1319/987 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1320 2022-07-05T10:32:59Z imj:CVR

Abstract Indext Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1320 10.30556/imj.Vol25.No1.2022.1320 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1320/988 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1321 2022-07-05T10:32:59Z imj:APX

Note for Contributor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1321 10.30556/imj.Vol25.No1.2022.1321 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1321/989 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1322 2022-07-05T10:32:59Z imj:APX

Back Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-06-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1322 10.30556/imj.Vol25.No1.2022.1322 Indonesian Mining Journal; Vol. 25 No. 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 Indonesian Mining Journal; Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1322/990 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1329 2023-05-22T06:20:16Z imj:ART

EVALUATION OF ROCK SLOPE USING Q-SLOPE, LIMIT EQUILIBRIUM AND FAILURE PROBABILITY AT ANDESITE MINE OF SIDOMULYO VILLAGE EVALUASI KESTABILAN LERENG BATUAN MENGGUNAKAN Q-SLOPE, KESETIMBANGAN BATAS DAN PROBABILITAS LONGSOR PADA TAMBANG ANDESIT DESA SIDOMULYO Akbar, Wahyu Nusantara Wiyono, Bagus open pit slope stability q-slope limit equilibrium probability of failure Open Pit Geotechnical tambang terbuka kestabilan lereng q-slope kesetimbangan batas probabilitas longsor For an open pit mine, the rock slope stability is one of the major significant challenges at every stage in the operation of an open pit mine. It became a concern from the planning until the mining closure. Mining activities in the research location have entered the mining closure phase and produced the final slope that consists of 4 single slopes with an overall slope height of 65m and an angle of 62° that its stability is not yet known. The actual overall slope has discontinuities which affect the potential for failure. Most of the methods used in geotechnical practice for estimating slope stability are based on the traditional limit equilibrium methods. On the other side, very few empirical techniques exist to assess the slope stability. The empirical method of the Q-Slope is a relatively new methodology for assessing the slope stability in terrains built from rock masses. This method was developed over the last decade by Barton and Bar (2015), with modifications to the original Q-System for application in rock slope stability through the parameter of RQD, Jn, Jr, Ja, O-Factor, Jwice, SRFa, SRFb and SRFc. The stability analysis by Q-Slope method has resulted the slope in stable condition because the value of βQ-Slope > βSlope. The factor of safety limit equilibrium method and probability of failure used the actual geometry and Q-Slope geometry is known in stable condition because it fulfils acceptance criteria with FoS ≥ 1,1 and PoF ≤ 37,5% according to the regulation Ministry of Energy and Mineral Resources Decree 1827/K/30/MEM/2018. Pada tambang terbuka, kestabilan lereng menjadi salah satu tantangan utama pada setiap tahapan dalam operasional pertambangan yang menjadi perhatian mulai dari tahap perencanaan hingga tahap penutupan tambang. Kegiatan pertambangan di lokasi penelitian sudah memasuki tahap penutupan tambang dan menghasilkan lereng akhir yang terdiri dari 4 lereng tunggal dengan tinggi lereng keseluruhan 65m dan sudut 62° dengan kondisi yang belum diketahui nilai tingkat stabilitasnya. Lereng keseluruhan aktual memiliki bidang diskontinu sehingga dapat mempengaruhi potensi adanya longsor. Pada umumnya metode yang diaplikasikan dalam kajian geoteknik untuk mengetahui kestabilan lereng didasarkan pada metode kesetimbangan batas. Di sisi lain, masih kurangnya metode empiris yang diaplikasikan untuk penilaian kestabilan lereng tambang. Metode empiris Q-Slope adalah metode baru yang diaplikasikan untuk penilaian kestabilan lereng pada massa batuan. Metode baru ini dikembangkan oleh Barton dan Bar (2015) yang merupakan modifikasi dari metode Q-System yang diaplikasikan untuk kestabilan lereng melalui parameter RQD, Jn, Jr, Ja, O-Factor, Jwice, SRFa, SRFb dan SRFc. Hasil analisis kestabilan lereng dengan metode Q-Slope diketahui bahwa lereng dalam keadaan stabil karena nilai βQ-Slope > βLereng. Tingkat faktor keamanan (FK) metode kesetimbangan batas dan probabilitas longsor (PL) pada setiap lereng tunggal menggunakan geometri lereng actual dan geometri lereng Q-Slope diketahui dalam keadaan yang stabil karena memenuhi kriteria penerimaan dengan nilai FK ≥ 1,1 dan PL ≤ 37,5% sesuai dengan peraturan pada Keputusan Menteri Energi dan Sumber Daya Mineral nomor 1827 K/30/MEM/2018. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1329 10.30556/imj.Vol26.No1.2023.1329 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023; 1-17 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023; 1-17 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1329/1037 Copyright (c) 2023 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/1343 2022-12-23T06:44:26Z imj:ART

CHARACTERIZATION, BENEFICIATION, AND REES EXTRACTION OF COAL BOTTOM ASH Rodliyah, Isyatun Rochani, Siti Sariman, Sariman Suganal, Suganal Umar, Datin Fatia Pramusanto, Pramusanto beneficiation coal bottom ash nitric acid leaching rare earth elements Rare earth elements are strategic materials. The elements have critical roles in meeting the needs of raw material for producing the modern industrial products. Most of the REE minerals is available in the form of associated minerals. One of them is coal. In terms of obtaining an overview regarding the possibility of coal to be a source of REEs, a research was carried out by beneficiating the bottom ash of the coal using a shaking table and a magnetic separator, and was followed by extracting the REEs using the alkaline fusion and leaching them using the nitric acid. The results showed that the bottom ash of gasified coal from the Palimanan pilot plant contained cerium, lanthanum, samarium, neodymium, praseodymium, europium, gadolinium, dysprosium, and yttrium, with a total content of 77.85 ppm. Concentrating the REEs using the shaking table and the magnetic separator result in a recovery of 32.96% and 50.5%, respectively. Extracting the REEs by alkaline fusion using NaOH as flux was not promising  while leaching with nitric acid was able to extract the REEs with various percentage extraction values, and the highest extraction for Neodymium was 73.46% under conditions of 2M nitric acid leaching and heated at 80°C. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1343 10.30556/imj.Vol25.No2.2022.1343 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 115 - 126 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 115 - 126 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1343/1003 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1344 2023-12-29T14:33:58Z imj:ART

APPLICATION OF INDUCED POLARIZATION (IP) METHOD FOR IDENTIFYING METALLIC MINERAL DISTRIBUTION IN THE LEON AREA APLIKASI METODE INDUCED POLARIZATION (IP) UNTUK MENGIDENTIFIKASI PENYEBARAN MINERAL LOGAM DI DAERAH LEON Nugraheni, Elleona Septi Yatini, Y Santoso, Agus chargeability induced polarization metallic minerals resistivity ketermuatan polarisasi terimbas mineral logam resistivity The research was conducted in the Leon area to determine the presence and quantity of metallic mineral resources. The stratigraphy of the study area is composed of alluvium and coastal deposits, Molasa Sarasin Formation, Tinombo Formation, and Intrusion. Exploration was carried out in the Leon area using Induced Polarization Method with a dipole-dipole configuration with an area of ​​950 m2. The length of the track is 580 meters with a North-South orientation. The number of tracks in this study was 15, with spacing electrodes as far as 20 meters and n = 1-10. The analysis showed that the distribution of resistivity values ​​in the study area was from (13.6 to 1337) Ωm, while the chargeability values ​​had a range of values ​​(1.7 to 50.6) ms. The low resistivity values ​​below 50 Ωm are interpreted as claystone to sandstone and the medium resistivity values ​​between 50 Ωm - 500 Ωm are interpreted as compact sandstone to breccia. The resistivity values ​​above 500 Ωm are interpreted as igneous rock. The presence of metallic minerals in the study area is characterized by changeability values ​​above 22 ms in claystone, sandstone, breccia, and igneous rock. Calculating hypothetical resources was conducted the Block model method at Oasis Montaj that obtained 11.8 million tons of resources. Penelitian dilakukan di Daerah Leon untuk mengetahui keberadaan dan besarnya sumberda ya mineral logam. Stratigrafi daerah penelitian disusun oleh alluvium dan endapan pantai, Formasi Molasa Sarasin, Formasi Tinombo, dan Batuan Terobosan. Eksplorasi yang dilakukan di Daerah Leon menggunakan Metode Polarisasi Terimbas konfigurasi dwikutub dengan luas kavling 950 m2. Panjang lintasan 580 meter dengan orientasi lintasan Utara-Selatan. Jumlah lintasan dalam penelitian ini sebanyak 15  dengan spasi antar elektroda sejauh 20 meter dan n=1-10. Hasil analisis didapatkan hasil persebaran nilai resistivitas daerah penelitian dari (13,6 – 1337) Ωm, sedangkan nilai ketermuatan memiliki rentang nilai (1,7 – 50,6) ms. Nilai resistivitas rendah dibawah 50 Ωm diinterpretasikan sebagai batulempung hingga batupasir Nilai resistivitas sedang antara 50 Ωm - 500 Ωm diinterpretasikan sebagai batupasir kompak hingga batubreksi. Nilai resistivitas tinggi di atas 500 Ωm diinterpretasikan sebagai batuan beku. Keberadaan mineral logam di daerah penelitian ditandai dengan nilai ketermuatan di atas 22 ms pada batulempung, batupasir, breksi, dan batubeku. Perhitungan sumberdaya hipotetik dilakukan dengan metode Block model pada Oasis Montaj diperoleh sumberdaya sebesar 11,8 juta ton. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1344 10.30556/imj.Vol26.No2.2023.1344 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023; 61-72 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023; 61-72 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1344/1059 Copyright (c) 2023 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/1346 2022-12-19T12:19:02Z imj:ART

ANALYSIS OF EXPLOSIVE ENERGY DISTRIBUTION AT PIT 7 WEST PT. MAKMUR MANDIRI UTAMA BINUNGAN SUARAN - BERAU, EAST KALIMANTAN PROVINCE Gusman, Mulya Fauzi, Fellya Septia Octova, Andree blastability index fragmentation blasting geometry R.L.Ash VED Blasting geometry and blasting material filling are closely related to the rock mass characteristics and the geological conditions to obtain ideal fragmentation. Blastability Index analysis, including Description of Rock Mass, Combined Plane Spacing, Combined Plane Orientation, Specific Gravity Influencey, and Hardness, are the alternative geometry experiment conducted to overcome the problem of rock fragmentation so that the speed of excavation equipment can increase according to the productivity of Komatsu PC2000 plan at PT. BUMA Jobsite BINSUA. Furthermore, the actual rock values obtained from blasting location and alternative geometry recommendations using R.L.Ash theory combined with Vertical Energy Distribution theory. In the C2 layer with a rock factor value of 5.95, the recommended load is 7.2 m, space is 8.3 m, and the VED explosive power is 48%. In layer D2 the rock factor value is 6.89 with a load of 7.5 m, space of 8.3 m, and 55% VED explosive charge. While in the DU layer, the rock factor value is 6.39 with a load of 7.3 m, 8.4 m space, and 51% VED filling of explosives. Prediction of blasting fragmentation analysis using Kuz-ram theory obtained fragmentation > 100 cm, namely 14.99% for the C2 layer, 14.84% for the D2 layer, and 14.82% for the DU layer. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1346 10.30556/imj.Vol25.No2.2022.1346 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 59 - 75 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022; 59 - 75 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1346/1007 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1364 2023-05-22T06:20:15Z imj:ART

STUDY OF SUPPLY-DEMAND OF INDONESIA BUTON ASPHALT KAJIAN PEMASOKAN-KEBUTUHAN ASPAL BUTON INDONESIA Miswanto, Agus Suherman, Ijang Suseno, Triswan Pravianto, Willy Asbuton road asphalt demand asphalt import Asbuton jalan kebutuhan aspal impor aspal National asphalt that was needed around 1.2 million tons per year are fulfilled by Pertamina's oil asphalt production around 272,040 tons (22.27%).  Such a production is related to US$283.77 million, Indonesian natural asphalt (Asbuton) from Buton around 21,226 tons (1.74%) that is worth US$9.13 million. Its shortfall was met by the an import of 945,180 tons (77.39%) that is worth of US$473.77 million. The Asbuton resources are enormous around 792.5 million tons and its reserve is approximately 182.65 million tons. There are 16 Asbuton processing factories with the total capacity of roughly 2.03 million tons per year. However, their production is still 43,128 tons per year. It means the production utility is only 2.1% of the total production capacity. This study aims to optimize the use of Asbuton. Secondary data is obtained from various agencies, official websites, research reports, journals, and sharing sessions. Data analysis using an econometric model with a simple linear regression equation. The results show that the import substitution program starts in 2023, where the national asphalt needs are 935,180 tons, and its production is 253,473 tons and its import substitution in the first year is gradually around 96,061 tons, which means that the will be 585,647 tons so that the country can save foreign exchange of US $ 65.66 million. In 2031, substitution has exceeded the imports number, result and the excess capacity, thus opening up the export opportunities of 96,060 tons. Referring to such condition, the country can get additional income around US$656.59 million. This situation will continue until the end of the projection year in 2045. Kebutuhan aspal nasional sebesar 1,2 juta ton per tahun, dipenuhi oleh aspal minyak produksi Pertamina 272.040 ton (22,27%) senilai US$283,77 juta, aspal alam buton Indonesia (Asbuton) sebesar 21.226 ton (1,74%) senilai US$9,13 juta, dan kekurangannya dipenuhi oleh impor 945.180 ton (77,39%) senilai US$473,77 juta. Sumber daya Asbuton sangat besar sekitar 792,5 juta ton dengan cadangan sekitar 182,65 juta ton. Ada 16 pabrik olahan Asbuton dengan total kapasitas sekitar 2,03 juta ton per tahun, namun produksinya hanya 43.128 ton per tahun artinya utilitas produksi hanya 2,1% dari total kapasitas produksi. Penelitian ini bertujuan untuk optimalisasi pemanfaatan Asbuton. Data yang digunakan adalah data sekunder yang diperoleh dari berbagai instansi, website resmi, laporan penelitian, jurnal, juga melalui sharing session. Analisis data menggunakan model ekonometrika dengan persamaan regresi linier sederhana. Hasil penelitian menunjukan bahwa program substitusi impor dimulai pada 2023, dengan kebutuhan aspal nasional 935.180 ton, dan menghasilkan produksi 253.473 ton. Substitusi  impor secara bertahap pada tahun pertama sebesar 96.061 ton yang berarti jumlah impor menjadi 585.647 ton sehingga negara dapat menghemat devisa US$65,66 juta. Pada 2031, substitusi telah melampaui jumlah impor sehingga terjadi ekses kapasitas sehingga terbuka peluang ekspor sebesar 96.060 ton dan negara berkesempatan untuk mendapatkan tambahan pendapatan sebesar US$656,59 juta. Keadaan ini akan berlangsung terus hingga akhir tahun proyeksi pada 2045. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1364 10.30556/imj.Vol26.No1.2023.1364 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1364/1031 Copyright (c) 2023 Indonesian Mining Journal http://creativecommons.org/licenses/by-nc/4.0

oai::article/1431 2022-12-19T12:19:02Z imj:CVR

Table of Content Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1431 10.30556/imj.Vol25.No2.2022.1431 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1431/1008 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1432 2022-12-19T12:19:02Z imj:CVR

From the Editor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1432 10.30556/imj.Vol25.No2.2022.1432 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1432/1009 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1433 2022-12-19T12:19:02Z imj:CVR

Abstract Indext Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1433 10.30556/imj.Vol25.No2.2022.1433 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1433/1010 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1434 2022-12-19T12:19:02Z imj:APX

Note for Contributor Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1434 10.30556/imj.Vol25.No2.2022.1434 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1434/1011 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1435 2022-12-19T12:19:02Z imj:CVR

Front Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1435 10.30556/imj.Vol25.No2.2022.1435 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1435/1012 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1436 2022-12-19T12:19:02Z imj:APX

Back Cover Wahyudi, Tatang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2022-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1436 10.30556/imj.Vol25.No2.2022.1436 Indonesian Mining Journal; Vol. 25 No. 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 Indonesian Mining Journal; Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1436/1013 Copyright (c) 2022 Indonesian Mining Journal

oai::article/1477 2023-05-22T06:20:15Z imj:ART

LITHIUM EXTRACTION FROM DIENG GEOTHERMAL BRINE USING SOLVENT EXTRACTION – A PRELIMINARY STUDY STUDI PENDAHULUAN: EKSTRAKSI LITIUM DARI FLUIDA PANAS BUMI DIENG MELALUI EKSTRAKSI PELARUT Wahyudi, Agus Septiarani, Andina Hairunnisa Rodliyah, Isyatun lithium solvent extraction geothermal brines brine panas bumi litium ekstraksi pelarut This preliminary study aims to obtain the lithium compounds from a geothermal brine through a solvent extraction. The brine samples were collected from PT Geodipa Energi Geothermal Power Plant in Dieng, Central Java, Indonesia. The ICP analysis was conducted to measure brine chemical composition. Brine’s lithium content was 62.73 ppm with the dominant impurities silica (Si), calcium (Ca), potassium (K), sodium (Na), and boron (B). Silica removal was conducted by centrifugation technic with the addition of flocculants, while calcium removal was achieved by adding sodium carbonate. The CYANEX® 936P was used for the extraction process and was diluted in kerosene (1:1 O/A ratio). The extraction pH was adjusted by adding 10% H2SO4 solution (acid condition) and 10% NH4OH (alkaline condition). The optimum condition for lithium extraction was observed at pH = 11, with the highest lithium recovery of 90%. The eluate from the stripping process was then precipitated by adding Na2CO3 to produce lithium carbonate powder. Melalui ekstraksi pelarut, studi pendahuluan ini bertujuan untuk memperoleh senyawa litium dari fluida/brine panas bumi. Percontoh brine diambil dari Pembangkit Listrik Tenaga Panas Bumi PT Geo Dipa Energi di Dieng, Jawa Tengah, Indonesia. Analisis ICP dilakukan untuk mengukur komposisi kimia brine. Kandungan litium brine adalah 62,73 ppm dengan pengotor dominan berupa silika (Si), kalsium (Ca), kalium (K), natrium (Na), dan boron (B). Penghilangan silika dilakukan dengan proses sentrifugasi dan penambahan flokulan, sedangkan proses penghilangan kalsium dilakukan dengan penambahan natrium karbonat. CYANEX® 936P digunakan untuk proses ekstraksi dan dilarutkan dalam kerosin (rasio O/A 1:1). Pengaturan pH saat proses ekstraksi dilakukan dengan menambahkan larutan H2SO4 10% (kondisi asam) dan NH4OH 10% (kondisi basa). Kondisi optimum untuk ekstraksi litium terjadi pada pH = 11, dengan perolehan litium tertinggi sebesar 90%. Eluat dari proses stripping kemudian diendapkan dengan menambahkan Na2CO3 sehingga terbentuk padatan litium karbonat. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1477 10.30556/imj.Vol26.No1.2023.1477 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023; 29-37 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023; 29-37 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1477/1028 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1488 2023-12-29T14:33:58Z imj:ART

IMPACT OF BLASTING WITH ELECTRONIC DETONATOR USING SEGMENTATION AND NON-SEGMENTATION METHODS DAMPAK HASIL PELEDAKAN DENGAN DETONATOR ELEKTRONIK MENGGUNAKAN METODE SEGMENTASI DAN NON-SEGMENTASI Handayana, Raden Haris Alghifari, Mohamad Rifki Salahudin, Sani Carlo, Nasfryzal segment non-segment vibration electronic detonator blasting segmen non-segmen getaran detonator elektronik peledakan Sebuku Tanjung Coal, a mining company, has a blasting location close tobuilding structures. This building is included in the Class 2 building on SNI 7571:2010 with a maximum peak vector sum (PVS) value of 3 mm/s or peak particle velocity (PPV) value of 3 - 7 mm/s at the frequency of 0-100 Hz. Several critical areas are located between 200 and 700 meters from the blasting location. The used initiation system is Hanwha Electronic Blasting System 2nd Generation (HEBS II), which uses HiMex 70 (emulsion) as an explosive type. In this paper, the tie-up design of blasting uses segment and non-segment methods to compare the results of blasting using the two methods. Based on 16 compared data points, the vibration results obtained using segment and non-segment had a value range of 2,767-15,102 mm/s. The average result of the digging time using the segment method is 10.9 seconds, while the non-segment method takes 10.3 seconds. The average size of fragmentation (D80) with the segment method is 49.1 cm, while the non-segment method is 45.4 cm. Sebuku Tanjung Coal adalah sebuah perusahaan pertambangan yang memiliki lokasi peledakan berdekatan dengan struktur bangunan. Struktur bangunan tersebut termasuk ke dalam bangunan Kelas 2 menurut SNI 7571:2010 dengan maksimal nilai peak vector sum (PVS) sebesar 3 mm/s atau nilai peak particle velocity (PPV) sebesar 3-7 mm/s pada frekuensi 0-100 Hz. Beberapa area kritis berada pada jarak 200-700 m dari lokasi peledakan. Sistem inisiasi yang digunakan adalah Hanwha Electronic Blasting System 2nd Generation (HEBS II) dengan kombinasi HiMex 70 (Emulsion) sebagai jenis bahan peledaknya. Penelitian ini, menerapkan rangkaian peledakan metode segmen dan non-segmen untuk membandingkan hasil peledakan kedua metode tersebut. Berdasarkan 16 data yang dibandingkan, didapatkan hasil getaran menggunakan segmen dan non-segmen dengan kisaran 2.767-15.102 mm/s. Rata-rata hasil digging time menggunakan metode segmen sebesar 10,9 detik, sedangkan menggunakan metode non-segmen sebesar 10,3 detik. Rata-rata ukuran fragmentasi (D80) dengan metode segmen sebesar 49,1 cm, sedangkan dengan metode non-segmen sebesar 45,4 cm. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1488 10.30556/imj.Vol26.No2.2023.1488 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023; 73-81 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023; 73-81 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1488/1060 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1490 2023-05-22T06:20:15Z imj:CVR

Tabel of Content Daftar Isi Daftar Isi Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1490 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1490/1032 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1491 2023-05-22T06:20:15Z imj:CVR

From the Editor Dari Editor Dari Editor Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1491 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1491/1033 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1494 2023-05-22T06:20:15Z imj:CVR

Front Cover Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1494 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1494/1034 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1495 2023-05-22T06:20:15Z imj:APX

Note for Contributor Petunjuk Penulis Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1495 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1495/1035 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1496 2023-05-22T06:20:15Z imj:APX

Back Cover Cover Belakang Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-05-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1496 Indonesian Mining Journal; Vol. 26 No. 1 (2023): Indonesian Mining Journal, April 2023 Indonesian Mining Journal; Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1496/1036 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1497 2024-12-31T15:34:22Z imj:ART

OPERATING COST COMPARISON SURFACE MINER AND DRILL & BLAST PERBANDINGAN BIAYA OPERASIONAL SURFACE MINER DAN PENGEBORAN & PELEDAKAN Handayana, Raden Haris Pratama, Panji Lubis, Jihan Farhan Salahudin, Sani operating cost surface miner fragmentation drill and blast initiation system biaya operasional surface miner fragmentasi pengeboran dan peledakan sistem inisiasi The method of rock breakage is commonly blasting. A few mining companies in Indonesia with facilities near community residences use alternative methods to breaking rock; one of them is using a surface miner. Aspects considered when choosing the method include economic aspects, especially operating costs. In this study case, the size of material that can continue on the next process is ≤ 400 mm; material from surface miner production is at the target; on blasting results, the fragmentation above the target is reduced using a hydraulic breaker; the initiating systems use an electronic detonator (HEBS II) and a non-electric detonator. This difference will affect the cost of the drill and blast. Based on calculated project data, surface miner operating costs are more costly, with an operating cost per ton of USD 1.16 compared with drill and blast methods including hydraulic breaker costs on the initiation system using an electronic detonator (HEBS II) of USD 0.88 per ton and non-electric operating costs of USD 0.83 per ton. Metode pemberaian batuan umumnya menggunakan peledakan, beberapa perusahaan tambang di Indonesia dengan kondisi dekat tempat tinggal warga menggunakan metode alternatif untuk memberai batuan, salah satunya menggunakan surface miner, aspek untuk memilih metode salah satunya ialah aspek ekonomi, terutama biaya operasional. Pada studi kasus ini ukuran material yang dapat berlanjut ke proses berikutnya adalah ≤ 400 mm, material hasil produksi surface miner memenuhi target tersebut, pada hasil blasting fragmentasi melebihi target dikurangi ukurannya menggunakan hidrolik breaker, sistem inisiasi yang digunakan electronic detonator (HEBS II) dan non-electric detonator, perbedaan ini akan berdampak pada biaya pengeboran dan peledakan. Berdasarkan perhitungan dari data proyek biaya operasional surface miner lebih mahal dengan biaya operasional per ton $ 1,16 dibandingkan dengan pengeboran dan peledakan sudah termasuk biaya hidrolik breaker pada sistem inisiasi menggunakan detonator elektronik sebesar $ 0,87, pada detonator non-electric biaya operasional sebesar $ 0,83 per ton. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1497 10.30556/imj.Vol27.No1.2024.1497 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024; 11-18 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024; 11-18 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1497/1091 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1498 2023-12-29T14:33:57Z imj:ART

INQUIRING THE FLYROCK TO DETERMINE MINIMUM SAFE DISTANCE OF COAL OVERBURDEN BLASTING AGAINST RESIDENTIAL AREA KAJIAN BATU TERBANG UNTUK MENENTUKAN JARAK AMAN MINIMUM PELEDAKAN LAPISAN PENUTUP BATUBARA TERHADAP WILAYAH PERMUKIMAN Handayana, Raden Haris Shodik, Fajar Salahudin, Sani fly rock safe radius stemming batu terbang radius aman stemming Fly rock is a rock fragmentation that is thrown as a result of blasting. Such fragmentation that is thrown beyond the specified safe distance can cause a damage to the infrastructure, mechanical equipment and humans. This study aims to determine the safe radius of the fly rock that resulting from blasting residential area which that has a distance 200-300 m and has potentially distressing to cause damage. Calculating of the flying rock throwing distance is carried out theoretically and actually with orientation to the distance between spaces, the distance between burdens, minimum stemming height, minimum hole depth, powder factor, average charge blast hole and distance initial burdens. For theoretical calculations, the save distance is calculated by empirical methods and dimensional analysis. Results of the study shows that the maximum distance of the actual fly rock throw is 05.31 m and based on the predictions using the Cratering Method, the maximum distance of fly rocks is 172 m with a safety factor of 2 and the maximum distance of fly rocks is 199.04 m with a safety factor of 2. Based on the actual and predicted data above, it is not safe for blasting locations that is less than 200 m from residential areas, that refers to the safe radius threshold based on the regulation of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018. Batu terbang adalah fragmentasi batuan yang terlempar akibat hasil peledakan. Fragmentasi batuan yang terlempar melebihi jarak aman yang ditentukan dapat menyebabkan kerusakan infrastruktur, alat mekanik dan manusia. Penelitian ini bertujuan untuk mengetahui radius aman batu terbang yang dihasilkan dari peledakan terhadap perumahan warga yang berjarak antara 200 – 300 m dan berpotensi menimbulkan kerusakan. Perhitungan jarak lemparan batu terbang dilakukan secara teoritis dan aktual dengan berorientasi pada jarak antar spasi, jarak antar burden, tinggi stemming minimum, kedalaman lubang minimum, powder factor, rata – rata isian per lubang ledak dan jarak burden awal. Untuk perhitungan teoritis menggunakan metode empirik dan analisis dimensi. Dari hasil penelitian diperoleh jarak maksimum lemparan batu terbang yang sebenarnya adalah 105,31 m dan berdasarkan prediksi menggunakan Cratering Method jarak maksimum batu terbang adalah 172 m dengan faktor keamanan 2 dan jarak maksimum batu terbang adalah 199,04 m dengan faktor keamanan 2. Berdasarkan data aktual dan prediksi di atas, peledakan dibawah radius 200 m tidak aman untuk dilakukan, mengacu pada nilai ambang batas radius aman peraturan Keputusan Menteri Energi dan Sumber Daya Mineral Nomor 1827K/30/MEM/2018. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1498 10.30556/imj.Vol26.No2.2023.1498 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023; 107-113 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023; 107-113 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1498/1061 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1505 2024-12-31T15:34:21Z imj:ART

MINI REVIEW OF ADSORPTION METHOD USING CONVENTIONAL MATERIALS FOR ACID MINE DRAINAGE TREATMENT TINJAUAN SINGKAT TENTANG METODE ADSORPSI MENGGUNAKAN BAHAN KONVENSIONAL UNTUK PENGOLAHAN AIR ASAM TAMBANG Wibowo, Yudha Gusti Tsabitah, Natasya Pratiwi, Cantika Nur'ani, Herlina Irene, Rilis Syahnur, Mirza Al-azizah, Putri Yudhoyono, Aryo Wijaya, Candra Bonifasius Kholivia Dody Oktantiyo S Anis acid mine drainage adsorption activated carbon biochar conventional material air asam tambang adsorpsi karbon aktif biochar material konvensional Acid mine drainage (AMD) is a highly dangerous form of water pollution results from coal mining activities. AMD is characterized by its high concentration of heavy metals and low pH levels, which have been linked to various health problems, including skin disease, cancer, and poisoning. This paper presents a comprehensive review of the available information on the AMD and its alternative low-cost treatment methods. One such method is adsorption, an eco-friendly and cost-effective approach to treating the AMD. This review draws on 99 published papers as the sources that provide a comprehensive overview of the AMD sources and problems worldwide. This study explores the potential of conventional materials, such as activated carbon, biochar, and other materials for treating the AMD. A special section on conventional materials is well-detailed and provides valuable insights into their effectiveness. It is essential to explore the alternative treatment methods that are both environmentally friendly and cost-effective. This review provides valuable insights in this regard. By using the low-cost and sustainable methods, we can effectively treat AMD and reduce its impact on the environment and human health. Air Asam Tambang (AAT) merupakan air tercemar berbahaya yang diakibatkan oleh aktivitas pertambangan batubara. AAT memiliki karakteristik konsentrasi logam berat yang tinggi dan nilai pH rendah. Kondisi ini dapat menyebabkan berbagai masalah kesehatan, seperti penyakit kulit, kanker, dan keracunan. Artikel ini menyajikan tinjauan ilmiah yang komprehensif tentang pengelolaan AAT menggunakan metode sederhana dan berbiaya rendah. Salah satu metode yang ramah lingkungan dan ekonomis dalam pengelolaan AAT adalah adsorpsi. Artikel ini meninjau 99 publikasi ilmiah untuk memperoleh informasi mengenai permasalahan AAT di seluruh dunia. Selain itu, penelitian ini mengeksplorasi potensi bahan konvensional, seperti karbon aktif, biochar, dan bahan lainnya, dalam menurunkan parameter pencemar pada AAT. Bagian khusus mengenai bahan konvensional dijelaskan dengan mendalam dan mendiskusikan efektivitasnya. Eksplorasi metode pengolahan alternatif yang ramah lingkungan dan berbiaya rendah sangat penting. Tinjauan ini memberikan wawasan berharga dalam konteks tersebut. Menggunakan metode yang ekonomis dan berkelanjutan, pengolahan AAT dapat dilakukan secara efektif sehingga mengurangi dampaknya terhadap lingkungan dan kesehatan manusia. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1505 10.30556/imj.Vol27.No1.2024.1505 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024; 19-37 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024; 19-37 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1505/1092 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1527 2023-12-29T14:33:57Z imj:ART

EFFECT OF MODIFYING THE HEATING TEMPERATURE ON THE BASALT GLAZE MIXTURES QUALITY FOR STONEWARE CERAMICS PENGARUH MODIFIKASI SUHU PEMANASAN PADA KUALITAS CAMPURAN GLASIR BASALT UNTUK KERAMIK TEMBIKAR Birawidha, David Candra Amanda, Jihan Fhara Syafriadi Amin, Muhammad Yanti, Evi Dwi Pratiwi, Indah Jannah, Wirdatul glaze Basalt temperature variation stoneware coating glasir basalt variasi suhu batu pelapisan Research has been conducted on the effect of temperature variations on basalt-based glaze mixtures for stoneware ceramic applications using temperature variations of 1100, 1200, and 1300°C. This research aims to determine the optimum temperature for the best quality basalt glaze. The glaze sample was made using raw materials of asalt, kaolin, and feldspar their composition around 60%, 10%, and 30% wts respectively performing their grain sizes under 100 mesh. Material characterization was carried out by analyzing their XRF, XRD, and optical microscopy. At a burning temperature of 1200oC, the basalt-based glaze mixture significantly influences the structure and changes of glaze on the surface of the specimen from a macro-structural perspective. At the temperature of 1200°C, the glaze layer has reached the perfect melting point and coats the specimen surface evenly and results in not easily cracked and broken. It was proven that the glaze liquid could penetrate the pores, completely covering the surface morphology of the test object. Regarding the multitude of colors formed at temperature of 1200°C, it can optimize the content of dye metals such as iron, manganese, and cobalt in the glaze materials. Telah dilakukan penelitian efek perubahan suhu pada campuran glasir berbasis basalt untuk aplikasi keramik batu menggunakan variasi suhu 1100, 1200 dan 1300°C. Penelitian ini bertujuan untuk menentukan suhu optimum untuk menghasilkan kualitas terbaik glasir basalt. Percontoh glasir dibuat menggunakan bahan baku basalt, kaolin, dan feldspar dengan komposisi 60%, 10%, dan 30% wt dan ukuran butir di bawah 100 mesh. Karakterisasi material dilakukan dengan menganalisis XRF, XRD, dan pengamatan mikroskop optik. Pada suhu pembakaran 1200°C, campuran glasir berbasis basalt memiliki pengaruh yang signifikan pada struktur dan perubahan glasir pada permukaan percontoh dari perspektif makrostruktur. Pada suhu 1200°C, lapisan glasir telah mencapai titik peleburan sempurna; glasir menutupi permukaan percontoh secara merata, dan tidak mudah pecah ataupun retak. Larutan glasir terbukti mampu meresap ke dalam pori-pori, menutupi morfologi permukaan benda uji dengan baik. Pembakaran pada suhu ini juga mengoptimalkan kandungan logam pewarna seperti besi, tembaga, dan kobalt yang terkandung dalam bahan glasir. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1527 10.30556/imj.Vol26.No2.2023.1527 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023; 83-91 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023; 83-91 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1527/1058 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1528 2023-12-29T14:33:56Z imj:ART

TECHNO-ECONOMIC OF GRAPHITE ANODE RECYCLING PROCESS OF ELECTRIC VEHICLE LITHIUM-ION BATTERIES TEKNO EKONOMI PROSES DAUR ULANG ANODA GRAFIT BATERAI LITHIUM-ION KENDARAAN LISTRIK Miswanto, Agus Wahyudi, Tatang Prakosa, Agus Birawidha, David Candra lithium-ion batteries electric vehicle graphite anode recycle economic baterai lithium-ion kendaraan listrik daur ulang anoda grafit ekonomi Graphite is the primary material for battery anodes used in electronic devices such as cell phones, laptops, and electric vehicles. Exploiting natural graphite in Indonesia is still in the exploration stage. The ever increasing demand for energy storage devices poses challenges in producing battery-grade graphite. One possible approach is to recycle the graphite anode (AG) from used Lithium-ion Batteries (LIB) into battery components. By utilizing waste as a raw material, production costs are lower as well as the use of LIB becomes more sustainable. This study discusses the techno-economics of AG recycling from electric vehicle (EV) LIBs. Secondary data is used from various research reports, journals, and books published through the official website as references and assumptions in calculations and analysis. Mechanical separation to remove plastic components, washing with organic solvents (using dimethyl carbonate-DMC) and using dimethyl carbonate (DMC) and N-methyl-2-pyrrolidone (NMP), then washing process with H2SO4 + H2O2 purifies graphite to be reused as anode material for the new LIB. Economic analysis shows that the Net Present Value is IDR 388,675,699, the Internal Rate of Return is 33.79% per year, and the Payback Period is two years and ten months. These three indicators show that the project is financially viable. The sensitivity analysis shows that it is still profitable if there is an increase in production costs of up to 20% and a decrease in selling prices of up to 20% or USD 12,000 per tonne. Grafit merupakan bahan utama anoda baterai yang digunakan pada perangkat elektronik seperti ponsel, laptop, dan kendaraan listrik. Pemanfaatan grafit alam di Indonesia masih dalam tahap eksplorasi. Permintaan perangkat penyimpanan energi yang semakin meningkat menimbulkan tantangan dalam memproduksi grafit tingkat baterai. Salah satu pendekatan yang mungkin dilakukan adalah dengan mendaur ulang anoda grafit (AG) dari Baterai Lithium-ion (LIB) bekas menjadi komponen baterai. Dengan memanfaatkan limbah sebagai bahan baku, biaya produksi menjadi lebih rendah serta penggunaan LIB menjadi lebih berkelanjutan. Penelitian ini membahas tentang tekno-ekonomi daur ulang AG dari LIB kendaraan listrik (EV). Data sekunder digunakan dari berbagai laporan penelitian, jurnal, dan buku yang diterbitkan melalui situs resmi sebagai referensi dan asumsi dalam perhitungan dan analisis. Pemisahan mekanis untuk menghilangkan komponen plastik, pencucian dengan pelarut organik (menggunakan dimetil karbonat-DMC) dan menggunakan dimetil karbonat (DMC) dan N-metil-2-pirolidon (NMP), kemudian proses pencucian dengan H2SO4 + H2O2 memurnikan grafit untuk digunakan kembali sebagai bahan anoda untuk LIB baru. Analisis ekonomi menunjukkan Net Present Value sebesar Rp388.675.699, Internal Rate of Return sebesar 33,79% per tahun, dan Payback Period dua tahun sepuluh bulan. Ketiga indikator ini menunjukkan bahwa proyek ini layak secara finansial. Analisis sensitivitas menunjukkan masih menguntungkan jika terjadi kenaikan biaya produksi hingga 20% dan penurunan harga jual hingga 20% atau USD 12.000 per ton. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1528 10.30556/imj.Vol26.No2.2023.1528 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023; 93-106 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023; 93-106 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1528/1062 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1531 2024-12-31T15:34:21Z imj:ART

ARTIFICIAL NEURAL NETWORK EVALUATION AND PREDICTION OF BLAST-INDUCED PEAK PARTICLE VELOCITY - A CASE STUDY OF LIMESTONE MINING PENILAIAN DAN PREDIKSI JARINGAN SYARAF TIRUAN TERHADAP KECEPATAN PARTIKEL YANG DIINDUKSI PELEDAKAN - STUDI KASUS PENAMBANGAN BATUGAMPING Prastowo, Rizqi Hendro Purnomo Firhad Firmansyah Ipmawan, Vico Luthfi peak particle velocity blast-induced ground vibration artificial neural network conventional predictors peak particle velocity getaran tanah artificial neural network model prediksi konvensional In recent decades, generation of ground vibrations results from blasting activities in mining sector has been identified as a significant cause of extensive harm to nearby structures, vegetation, and individuals. Hence, it is imperative to closely monitor and accurately forecast the uncertain levels of vibration, and implement the appropriate steps to mitigate their potentially harmful impact. The objective of this study was to establish a correlation between the peak particle velocity and the various parameters that influence it. This study employed the deployment of the artificial neural network approach to assess and forecast the uncertain ground vibrations. In this study, a multilayer perception neural network with three layers and a feed-forward back-propagation architecture was employed. The network consisted of five input parameters, namely the distance from the blast face, maximum charge per delay, spacing, burden, and depth hole. The output of interest was the peak particle velocity. The neural network was trained using the Levenberg–Marquardt algorithm, and the training dataset comprised 29 experimental records and blast event data obtained from the limestone mine in Indonesia. In order to assess the effectiveness and the precision of the artificial neural network model that was created, a total of four conventional predictor models were utilized. These models were proposed by reputable sources such as the US Bureau of Mines, Ambraseys–Hendron, Langefors–Kihlstrom, and the Bureau of Indian Standards. The results collected from the demonstrate study show that the artificial neural network model suggested in this research has the ability to provide more precise estimations of ground vibrations in comparison to existing conventional prediction models. The artificial neural network model yielded a coefficient of determination (R2) of 0.9332 and a root mean square error (RMSE) of 0.4763. Dalam beberapa dekade terakhir, getaran tanah yang dihasilkan dari aktivitas peledakan pada sektor pertambangan telah teridentifikasi sebagai penyebab kerusakan struktur tanah, vegetasi, dan masyarakat sekitar. Oleh karena itu, perlu adanya pemantauan getaran secara akurat untuk memperkirakan tingkat getaran, dan menerapkan langkah-langkah yang tepat untuk mengurangi dampak kerusakan akibat getaran peledakan. Tujuan penelitian ini adalah memprediksi peak particle velocity (PPV) dan berbagai parameter yang mempengaruhinya. Penelitian ini menggunakan pendekatan jaringan syaraf tiruan untuk menilai dan meramalkan getaran tanah yang tidak menentu. Dalam penelitian ini, jaringan saraf persepsi multilayer dengan tiga lapisan dan arsitektur feed-forward back-propagation digunakan. Jaringan ini terdiri dari lima parameter input, yaitu jarak permukaan ledakan, muatan maksimum per penundaan, spasi, burden, dan kedalaman lubang. Keluaran yang diinginkan adalah kecepatan partikel puncak. Jaringan syaraf tiruan dilatih menggunakan algoritma Levenberg-Marquardt, dan kumpulan data pelatihan terdiri dari 29 aktivitas peledakan dan data kejadian ledakan yang diperoleh dari tambang batugamping di Indonesia. Untuk menilai efektivitas dan ketepatan model jaringan syaraf tiruan yang telah dibuat, sebanyak empat model prediktor konvensional digunakan sebagai pembanding. Model prediksi tersebut adalah US Bureau of Mines, Ambraseys–Hendron, Langefors–Kihlstrom, dan Bureau of Indian Standards. Hasil yang diperoleh dari penelitian ini menunjukkan bahwa model jaringan syaraf tiruan memiliki kemampuan untuk memberikan estimasi peak particle velocity (PPV) yang lebih akurat dibandingkan dengan model prediksi konvensional yang sudah ada. Model jaringan syaraf tiruan menghasilkan koefisien determinasi (R2) sebesar 0,9971 dan root mean square error (RMSE) sebesar 0,08133. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1531 10.30556/imj.Vol27.No1.2024.1531 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024; 1-9 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024; 1-9 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1531/1090 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1533 2024-12-31T15:34:20Z imj:ART

EFFECT OF THERMAL UPGRADING WITH VARIOUS REDUCTANTS ON SAPROLITIC NICKEL ORE: A PRELIMINARY STUDY DAMPAK PENINGKATAN PANAS DAN JENIS REDUKTAN TERHADAP SAPROLIT: STUDI PENDAHULUAN Bahfie, Fathan Manaf, Azwar Astuti, Widi Nurjaman, Fajar Prasetyo, Erik Susanti, Diah Sipahutar, Wahyu Solafide microstructure phase transformation reductant variation type saprolite thermal upgrading strukturmikro transformasi fasa jenis variasi reduktor saprolit peningkatan secara termal Indonesia significantly contributes to the global electric vehicle battery market due to its substantial medium- and low-grade nickel reserves. This study utilized saprolitic nickel ore from Halmahera, Maluku, Indonesia. However, the research on saprolite needs some improvements due to its complex mineral composition, which affected on the roasting process significantly. Therefore, a thorough understanding of the properties of laterite ores is critically important, particularly concerning laterite pre-reduction processes. The ore was finely sieved to a particle size of less than 100 mesh and then heated at temperatures of 250, 900, and 1150°C with the variation of reductant (anthracite and palm kernel charcoal). Extensive mineralogical analysis was conducted using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). The analysis of saprolite showed that it contains about 1.82% nickel, 30.47% iron, 10-20% magnesium, 4.86% aluminum, and 8.1% silicon by weight. Its mineral composition is mainly 53.1% goethite, 38.3% lizardite, and 8.7% quartz. The study found that goethite in saprolite was transformed into hematite around 250°C. At 900°C, the forsterite was crystallized, and at 1150°C, the ferronickel was formed. The transformation of lizardite is important as it affected on nickel diffusion within the iron matrix, which impacted on the material's properties. A thermal upgrading method with reductants like anthracite and palm kernel charcoal was used at lower temperatures to enhance the properties of saprolite. These findings provided valuable insights into saprolite's mineralogical composition and behavior, potentially offering improvements in various industrial processes and applications. Indonesia memberikan kontribusi signifikan terhadap pasar baterai kendaraan listrik global karena cadangan nikel kadar menengah dan rendah yang besar. Penelitian ini memanfaatkan bijih saprolit dari Halmahera, Maluku, Indonesia. Namun, penelitian mengenai saprolit memerlukan beberapa perbaikan karena komposisi mineral bijih saprolit yang kompleks sehingga berdampak signifikan pada proses pemanggangan. Oleh karena itu, pemahaman menyeluruh tentang sifat-sifat bijih laterit sangatlah penting, khususnya mengenai proses pra-reduksi laterit. Bijih diayak halus hingga mencapai ukuran partikel 100 mesh, ukuran optimal yang diketahui untuk bijih laterit, dan kemudian dilakukan pemanasan terkontrol pada suhu 250, 900, dan 1150°C dengan variasi reduktan (antrasit dan arang cangkang sawit). Analisis mineralogi ekstensif dilakukan dengan menggunakan difraksi sinar-X (XRD), fluoresens sinar-X (XRF), dan pemindaian mikroskop electron dengan spektroskopi dispersive energi (SEM-EDS). Analisis saprolit menunjukkan mengandung sekitar 1,82% nikel, 30,47% besi, 10-20% magnesium, 4,86% aluminium, dan 8,1% silicon menurut beratnya. Komposisi mineralnya terutama 53,1% goetit, 38,3% lizadit, dan 8,7% kuarsa. Studi ini menemukan bahwa goetit dalam saprolit berubah menjadi hematit pada suhu sekitar 250°C. Pada suhu 900°C, forsterit mengkristal, dan pada suhu 1150°C, feronikel terbentuk. Transformasi lizardit penting karena mempengaruhi difusi nikel dalam matriks besi, sehingga berdampak pada sifat material. Penggunaan metode peningkatan termal pada suhu yang lebih rendah dengan reduktor seperti antrasit dan arang cangkang sawit dimaksudkan untuk meningkatkan sifat saprolit. Temuan ini memberikan wawasan berharga mengenai komposisi dan perilaku mineralogi saprolit, yang berpotensi menawarkan perbaikan dalam berbagai proses dan aplikasi industri. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1533 10.30556/imj.Vol27.No1.2024.1533 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024; 53-62 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024; 53-62 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1533/1094 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1538 2024-12-31T15:34:20Z imj:ART

RECOVERY OF IRON MINERAL FROM INDONESIAN BAUXITE RESIDUE PEROLEHAN MINERAL BESI DARI RESIDU BAUKSIT INDONESIA Sariman Rochani, Siti Saleh, Nuryadi Wijayanti, Retno Dianawati, Erika Arum bauxite residue iron concentrate iron mineral recovery magnetic separation roasting residu bauksit konsentrat besi perolehan kembali mineral besi pemisahan magnetik pemanggangan Bauxite residue, a solid waste discharged during alumina extraction, is a hazardous material. Its disposal leads to a serious environmental issue although it contains valuable matter such as titanium, silica, rare earth elements, and high iron content (20-60%). This work aims to improve the recovery of iron content within the bauxite residue using three methods, namely direct magnetic separation, roasting followed by magnetic separation, and reduction followed by magnetic separation. Coal as a reductant and Na2CO3 and Na2SO3 as fluxes were used in the reduction process. The result of the study reveals that the direct magnetic separation produces iron concentrate with the Fe content of 53.69% and a recovery of 26.72%, while the roasting process at 900˚C and magnetic separation produces a concentrate of 54.57% Fe with a recovery of 37.33%. The best method was by reduction and magnetic separation process using 4% of Na2CO3  producing iron concentrates with a content of 63.53% Fe and recovery of 74.73%. Residu bauksit merupakan limbah padat yang dibuang pada saat ekstraksi alumina. Karena limbah ini merupakan bahan berbahaya dan beracun, pembuangannya dapat menimbulkan masalah lingkungan yang serius. Di sisi lain, residu bauksit mengandung bahan berharga seperti titanium, silika, unsur tanah jarang, dan kandungan besi yang tinggi (20-60%). Penelitian ini bertujuan untuk meningkatkan perolehan kembali kandungan besi menggunakan tiga metode, yaitu pemisahan magnetik langsung, pemanggangan diikuti pemisahan magnetik, dan reduksi diikuti pemisahan magnetik. Pada proses reduksi, sebagai reduktor digunakan batubara serta Na2CO3 dan Na2SO3 sebagai fluks. Pemisahan magnet secara langsung menghasilkan konsentrat besi dengan kandungan 53,69% Fe dengan perolegan sebesar 26,72, sedangkan proses pemanggangan pada suhu 900˚C dan pemisahan magnetik menghasilkan konsentrat mengandung 54,57% Fe dengan perolehan sebesar 37,33%. Metode terbaik adalah proses reduksi dan pemisahan magnetik menggunakan fluks Na2CO4 4% yang menghasilkan konsentrat besi dengan kandungan 63,53% Fe dan perolehan sebesar 74,73%. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1538 10.30556/imj.Vol27.No1.2024.1538 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024; 39-51 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024; 39-51 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1538/1093 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1539 2025-10-31T02:47:08Z imj:ART

THE EFFECT OF HYDROTHERMAL PROCESS ON INCREASING HEATING VALUE AND REDUCING MOISTURE CONTENT OF LOW-RANK COAL PENGARUH PROSES HIDROTERMAL TERHADAP PENINGKATAN NILAI KALOR DAN PENURUNAN KADAR AIR PADA BATUBARA PERINGKAT RENDAH Marlinda, Lenny Pane, Xena Maharani Wiratama, Jarot Zahar, Wahyudi Khadafi, Muhammad Reza Rahmi hydrothermal low-rank coal calorific value water content hidrotermal batubara peringkat rendah nilai kalori kadar air As a low-rank coal, brown coal is characterized to have high water content. It is required a method to improve coal quality that can be used for effective coal utilization. One of the methods is to apply thermal dewatering technology which focuses on improving the quality of low-rank coal using water medium and autoclave. The purpose of this study was to determine the effect of coal to water ratio (w/v) and the effect of particle size of a low rank-coal on water content and calorific value using the hydrothermal method. Coal was processed under hydrothermal conditions at 150 °C for 60 min. For a mixture of 100 g of 25 mesh coal and 50 mL of water, the calorific value and water content after the hydrothermal process reached 5,849 kcal/kg and 5.10% (adb), respectively. While for a mixture of 100 g of 40 mesh coal and 50 mL of water, the calorific value and water content after the hydrothermal process reached 5,789 kcal/kg and 4.94% (adb), respectively. The calorific value obtained increased from the initial value of 3,296 kcal/kg and the water content decreased from the initial value of 44.34% for the coal condition before hydrothermal process. It can be concluded that the hydrothermal process with heating without oxygen carried out by a hydrothermal reactor could increase the calorific value of low-rank coal and reduce water content. Batubara coklat sebagai batubara peringkat rendah mempunyai kandungan air yang tinggi. Diperlukan metode untuk meningkatkan kualitas batubara yang dapat digunakan untuk pemanfaatan batubara secara efektif. Salah satu caranya adalah dengan menerapkan teknologi hidrotermal yang fokus pada peningkatan kualitas batubara peringkat rendah dengan media air dan alat autoklaf. Tujuan penelitian ini adalah untuk mempelajari pengaruh dua variabel proses hidrotermal yaitu perbandingan batubara dengan air (b/v) dan ukuran partikel batubara peringkat rendah, terhadap kadar air dan nilai kalor. Pada proses hidrotermal, batubara dipanaskan pada suhu 150 °C dengan waktu pemanasan ±60 menit. Untuk campuran 100 g batubara berukuran 25 mesh dan 50 mL air, nilai kalor dan kadar air setelah proses hidrotermal masing-masing mencapai 5.849 kkal/kg dan 5,10%. Sedangkan untuk campuran 100 g batubara berukuran 40 mesh dan 50 mL air, nilai kalor dan kadar air mencapai 5.789 kkal/kg dan 4,94%. Nilai kalor yang diperoleh ini meningkat dari nilai awal sebesar 3.296 kkal/kg dan kadar air menurun dari nilai awal sebesar 44,34% untuk kondisi batubara sebelum mengalami proses hidrotermal. Dapat disimpulkan bahwa proses hidrotermal dengan kondisi dan variabel proses penelitian dapat meningkatkan nilai kalor batubara peringkat rendah dan menurunkan kadar air. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2025-04-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1539 10.30556/imj.Vol28.No1.2025.1539 Indonesian Mining Journal; Vol. 28 No. 1 (2025): Indoneisan Mining Journal, April 2025; 45-52 Indonesian Mining Journal; Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025; 45-52 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1539/1124 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1544 2025-03-17T18:26:46Z imj:ART

HEAVY OIL FROM CATALYTIC CRACKING OF POLYPROPYLENE-LOW DENSITY POLYETHYLENE PLASTIC WASTE PYROLYSIS OIL TO IMPROVE THE QUALITY OF LIGNITE PEMANFAATAN MINYAK BERAT HASIL PERENGKAHAN KATALITIK MINYAK PLASTIK POLYPROPYLENE-LOW DENSITY POLYETHYLENE UNTUK MENINGKATKAN KUALITAS LIGNIT Marlinda, Lenny Mardhatillah Raden Ilham Rahmi Muhammad Al Muttaqii lignite heavy oil PP/LDPE slurry dewatering moisture calorific value lignit minyak berat PP/LDPE slurry dewatering moisture nilai kalori The most obvious characteristics of lignite are its high moisture content (30-50%) and relatively low calorific value compared to other types of coal. This causes low combustion efficiency, making it not optimal for use as fuel. In this study, the slurry dewatering process was applied to coal that has a low calorific value of 3,662 cal/g and a moisture content of 37.29%. The addition effect of heavy oil from catalytic cracking of Polypropylene-Low Density Polyethylene (PP/LDPE) plastic waste pyrolysis oil on improving quality of lignite was investigated in this study. Heavy oil was used as additive. The ratio of 120 mesh lignite to heavy oil used was 100:15, 100:30, 100:45, 100:60, 100:75, and 100:90 (g/mL). Coal was carried out with a slurry dewatering process in an autoclave at various temperatures of 140 and 150 °C for 60 min. The test results obtained the highest calorific value of 6,374 cal/g and the moisture content of 2.81% for a ratio of lignite to heavy oil of 100: 45 g/mL at a temperature of 140 °C. Karakteristik lignit yang paling jelas adalah kadar airnya yang tinggi (30-50%) dan nilai kalor yang relatif rendah dibandingkan dengan jenis batubara lainnya. Hal ini menyebabkan efisiensi pembakarannya rendah, sehingga kurang optimal untuk digunakan sebagai bahan bakar. Dalam penelitian ini, proses dewatering slurry diterapkan pada batubara yang memiliki nilai kalor rendah yaitu 3.662 kal/g dan kadar air 37,29%. Pengaruh penambahan minyak berat hasil perengkahan katalitik minyak pirolisis limbah plastik Polypropylene-Low Density Polyethylene (PP/LDPE) terhadap peningkatan kualitas lignit dipelajari dalam penelitian ini. Minyak berat digunakan sebagai zat aditif. Perbandingan lignit 120 mesh dan minyak berat yang digunakan adalah 100:15, 100:30, 100:45, 100:60, 100:75, dan 100:90 (g/mL). Batubara diproses dengan metode slurry dewatering dalam autoklaf pada suhu 140 dan 150 °C selama 60 menit. Hasil pengujian diperoleh nilai kalor tertinggi sebesar 6.374 kal/g dan kadar air 2,81% untuk perbandingan lignit terhadap minyak berat 100:45 g/mL pada suhu 140 °C. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-10-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1544 10.30556/imj.Vol27.No2.2024.1544 Indonesian Mining Journal; Vol. 27 No. 2 (2024): Indonesian Mining Journal, October 2024; 125-136 Indonesian Mining Journal; Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024; 125-136 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1544/1105 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1548 2025-10-23T02:31:14Z imj:ART

COMPARATIVE ASSESSMENT OF ROCK SLOPE STABILITY ANALYSIS USING GENERALIZED ANISOTROPIC AND JOINT NETWORK PENILAIAN PERBANDINGAN KESTABILAN LERENG BATUAN MENGGUNAKAN GENERALIZED ANISOTROPIC DAN JOINT NETWORK Akbar, Wahyu Nusantara Barlian Dwinagara Singgih Saptono Dahono Haryanto Shofa Rijalul Haq Bagus Wiyono Oktarian Wisnu Lusantono slope stability limit equilibrium method finite element method anisotropy jointed rock masses kestabilan lereng kesetimbangan batas elemen hingga anisotropi massa batuan Rock slope stability analysis in a geotechnical study is an important issue in mining engineering. Kinematic analysis is a well-known method to determine potential failures of the rock slope based on structural orientations, but it sometimes disregards the structural properties information. Structural properties are often known as the highly interpreted domains in rock slope engineering; thus, simplification was made for the analysis. Simplification may lead to vague conditions of analysis and reduce its accuracy. Therefore, the aims of this research is to assess the effect of rock structure properties such as heterogeneity, discontinuity, and anisotropic properties of the rock mass. The assessment conducted using the limit-equilibrium method employed the Generalized Anisotropic (GA) material model were compared with finite element method (FEM) using the shear strength reduction (SSR) method employing the joint network rock mass model. The analysis results show that an actual rock slope with a generalized anisotropic material model in the LEM analysis and joint network material model in the FEM analysis is stable with Safety Factor > 1, and the maximum strain model is less than the minimum strain threshold (maximum strain < 0.1). Combining rock slope stability analysis methods aims to produce accurate and representative results regarding the rock mass' condition. This research improves the interpretation of rock slope stability analyses, resulting in a more accurate estimation of the factor of safety (FOS). Analisis kestabilan lereng batuan dalam kajian geoteknik merupakan permasalahan penting dalam bidang teknik pertambangan. Analisis kinematika adalah metode yang pada umumnya digunakan untuk menentukan potensi keruntuhan lereng batuan berdasarkan orientasi struktur dan terkadang mengabaikan informasi sifat struktur. Karakteristik struktur sering dikenal sebagai domain yang diinterpretasikan dalam rekayasa lereng batuan sehingga dilakukan penyederhanaan untuk analisisnya. Penyederhanaan dapat menyebabkan analisis menjadi samar dan mengurangi tingkat keakuratannya. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh dari karakteristik struktur batuan yaitu heterogenitas, diskontinuitas, dan anisotropi terhadap massa batuan. Analisis kestabilan dilakukan dengan menggunakan metode kesetimbangan batas dengan material model generalized anisotropic (GA) dan dibandingkan dengan metode elemen hingga (FEM) dengan metode reduksi kekuatan geser (SSR) dengan menggunakan model massa batuan joint network. Hasil analisis menunjukkan bahwa lereng batuan aktual dengan material model generalized anisotropic pada analisis LEM dan material model joint netwok pada analisis FEM diketahui dalam keadaan stabil dengan nilai faktor keamanan > 1, dan regangan maksimum model lebih kecil dari ambang batas regangan minimum (regangan maksimum < 0,1). Kombinasi metode analisis kestabilan lereng batuan bertujuan untuk menghasilkan hasil yang akurat dan representatif mengenai karakteristik massa batuan. Penelitian ini meningkatkan interpretasi analisis kestabilan lereng batuan sehingga menghasilkan nilai faktor keamanan yang lebih akurat. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2025-04-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1548 10.30556/imj.Vol28.No1.2025.1548 Indonesian Mining Journal; Vol. 28 No. 1 (2025): Indoneisan Mining Journal, April 2025; 1-15 Indonesian Mining Journal; Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025; 1-15 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1548/1121 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1555 2023-12-29T14:33:56Z imj:CVR

Front Cover Fron Cover Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1555 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1555/1063 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1556 2023-12-29T14:33:56Z imj:CVR

From the Editor From the Editor Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1556 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1556/1064 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1557 2023-12-29T14:33:56Z imj:CVR

Table of Contents Table of Contents Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1557 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1557/1065 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1558 2023-12-29T14:33:56Z imj:CVR

Abstract Index Abstract Index Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1558 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1558/1066 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1559 2023-12-29T14:33:56Z imj:APX

Note for Contributor Note for Contributor Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1559 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1559/1067 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1560 2023-12-29T14:33:56Z imj:APX

Back Cover Back Cover Balai Besar Pengujian Mineral dan Batubara tekMIRA 2023-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1560 Indonesian Mining Journal; Vol. 26 No. 2 (2023): Indonesian Mining Journal, October 2023 Indonesian Mining Journal; Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1560/1068 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1561 2025-03-17T18:26:45Z imj:ART

ESTIMATION OF POST-MINING GUARANTEES FOR PT. X’S MINERAL ROCK MINING OPERATIONS IN MANOKWARI REGENCY ESTIMASI JAMINAN PASCATAMBANG USAHA PERTAMBANGAN MINERAL BATUAN PT. X DI KABUPATEN MANOKWARI Setiawan, Arif Imbo, Yuldi Christiani Paradida, Yulia Putri post-mining guarantee production operations direct and indirect costs jaminan pascatambang operasi produksi biaya langsung dan tidak langsung PT. X is one of the companies in Manokwari that is engaged in rock mining. Currently, the company has conducted a feasibility study and has progressed to the production operation stage. Any company that aims to upgrade its license from an Exploration Mining Business License (IUP) to a Production Operation License is required to prepare a post-mining plan document, which includes post-mining financing. The amount of this financing will be deposited in a bank as a post-mining guarantee to the government. This study aims to estimate the amount of the post-mining guarantee that will be deposited on behalf of the government. To achieve this objective, the study employs an applied research method by referring to the Minister of Energy and Mineral Resources Decree No. 1827 K/30/MEM/2018. The results of this study show that the post-mining guarantee consists of direct costs amounting to IDR 92,750,110 and indirect costs amounting to IDR 15,303,768, resulting in a total post-mining cost of IDR 108,053,878 to be deposited. Based on these findings, the post-mining guarantee will not be fully paid at once, but will be divided into three installments: in the first year, IDR 55,242,545 will be deposited, followed by IDR 33,891,302 in the second year, and IDR 23,102,571 in the third year. PT. X merupakan salah satu perusahaan di Manokwari yang bergerak di bidang usaha pertambangan batuan. Saat ini, perusahaan telah melakukan studi kelayakan dan melanjutkan ke tahap operasi produksi. Setiap perusahaan yang akan meningkatkan perizinannya dari Izin Usaha Pertambangan (IUP) Eksplorasi ke Izin Usaha Pertambangan Operasi Produksi diwajibkan untuk mempersiapkan dokumen rencana pascatambang yang mencakup pembiayaan pascatambang. Besaran biaya tersebut akan didepositokan ke bank sebagai jaminan pascatambang kepada pemerintah. Penelitian ini bertujuan untuk memperkirakan besaran jaminan pascatambang yang akan didepositokan atas nama pemerintah. Untuk mencapai tujuan tersebut, penelitian ini menggunakan metode penelitian terapan dengan mengacu pada Keputusan Menteri ESDM No. 1827 K/30/MEM/2018. Hasil penelitian ini menunjukkan bahwa jaminan pascatambang terdiri dari biaya langsung sebesar Rp 92.750.110 dan biaya tidak langsung sebesar Rp 15.303.768, sehingga jumlah total biaya pascatambang yang akan didepositokan adalah Rp 108.053.878. Berdasarkan hasil tersebut, jaminan pascatambang tidak akan dibayarkan sekaligus, melainkan dilakukan dalam tiga tahap. Pada tahun pertama, akan didepositokan sebesar Rp 55.242.545, pada tahun kedua sebesar Rp 33.891.302, dan pada tahun ketiga sebesar Rp 23.102.571. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-10-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1561 10.30556/imj.Vol27.No2.2024.1561 Indonesian Mining Journal; Vol. 27 No. 2 (2024): Indonesian Mining Journal, October 2024; 73 - 88 Indonesian Mining Journal; Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024; 73 - 88 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1561/1102 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1578 2025-03-17T18:26:45Z imj:ART

CALCULATION OF FUEL CONSUMPTION IN HD 465-7R USING ENGINE RPM METHOD AND APPROACH PER SEGMENT AT MINING INDUSTRY IN EAST KALIMANTAN PERHITUNGAN KONSUMSI BAHAN BAKAR PADA HD 465 -7R MENGGUNAKAN METODE RPM MESIN DAN PENDEKATAN PER SEGMENT PADA PERUSAHAAN PERTAMBANGAN DI KALIMANTAN TIMUR Pranajiwa Shalaho Dina Devy Albertus Juvensius Pontus Windhu Nugroho Harjuni Hasan fuel fuel consumption RPM machine segment bahan bakar konsumsi bahan bakar RPM mesin segmen Fuel is usually used by engines to move or do work. In this article, the machine is a mining industry vehicle with the code HD 465 – 7R type from the Komatsu company. The vehicle is used to move overburden material from the loading area to the disposal area. Fuel consumption is usually influenced by several factors, the most influential of which are the slope of the road, the type of material used for the road, and the distance from the loading place to the dumping place. There are several methods are used to calculate fuel consumption, the most familiar of which is the vehicle working hours (hour meter) method. In this research, the calculation of fuel consumption uses engine RPM with a segment approach method taken with a segment distance of between 100 - 200 meters. The results of calculating fuel usage on the HD 465 – 7R have a figure of 51.7 liters/hour, with the actual value being 51.9 liters/hour. The conclusion of this research is that by using the engine RPM method, the results of fuel usage calculations are also close to the actual values. Testing by RPM with an hour meter is very different, where testing by RPM is based on the length of duration at that RPM number; the higher the RPM and the longer the duration of time, the greater the fuel released. This is continuous with the road segment, where an uphill road segment will definitely increase travel time due to a decrease in speed, and the RPM will increase. Pengunaan bahan bakar biasanya digunakan oleh mesin untuk berpindah ataupun melakukan sesuatu pekerjaan. Pada artikel ini, mesin tersebut ialah kendaraan pada industri pertambangan dengan jenis HD 465 – 7R dari perusahaan Komatsu. Kendaraan tersebut digunakan untuk memindahkan material tanah penutup dari tempat pemuatan hingga ke tempat pembuangan (disposal area). Konsumsi bahan bakar biasanya dipengaruhi oleh beberapa faktor, antara lain yang paling berpengaruh adalah kemiringan jalan, jenis material yang digunakan untuk jalan, dan jarak dari tempat loading menuju ke tempat dumping. Terdapat beberapa metode yang digunakan untuk menghitung konsumsi bahan bakar, yang paling familiar ialah metode jam kerja kendaraan (hour meter). Pada penelitian kali ini, perhitungan konsumsi bahan bakar menggunakan RPM mesin dengan metode pendekatan persegment yang diambil dengan jarak persegment antara 100 – 200 meter. Hasil perhitungan pengunaan bahan bakar pada HD 465 – 7R memiliki torehan angka sebesar 51,7 liter/jam, dengan nilai aktualnya sebesar 51,9 liter/jam. Kesimpulan dari penelitian ini ialah dengan menggunakan metode RPM mesin, hasil perhitungan pengunaan bahan bakar juga mendekati nilai aktual. Pengujian secara RPM dengan Hour meter sangat berbeda, dimana pengujian secara RPM didasari dari lamanya durasi pada angka RPM tersebut, semakin tinggi RPM dan semakin lama durasi waktu, maka bahan bakar yang dikeluarkan semakin besar. Hal ini berkesinambungan dengan segmen jalan, dimana segmen jalan yang menanjak pasti akan membuat waktu tempuh menjadi lama karena penurunan kecepatan, dan RPM menjadi naik. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-10-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1578 10.30556/imj.Vol27.No2.2024.1578 Indonesian Mining Journal; Vol. 27 No. 2 (2024): Indonesian Mining Journal, October 2024; 89 - 96 Indonesian Mining Journal; Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024; 89 - 96 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1578/1103 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1595 2025-10-31T02:33:56Z imj:ART

TECHNICAL AND ECONOMIC ASSESSMENT ON ENVIRONMENTAL QUALITY MANAGEMENT OF COAL STOCKPILE FOR ENVIRONMENTAL SUSTAINABILITY PENILAIAN TEKNIS DAN EKONOMIS KUALITAS PENGELOLAAN LINGKUNGAN STOCKPILE BATUBARA UNTUK LINGKUNGAN BERKELANJUTAN Juniah, Restu Ambarita, Novitasari Syarifudin Zakir, Syaifudin Rahmi, Hisni Amanda, Ridho Rizky assessment technical economic environmental management stockpile penilaian teknis ekonomi pengelolaan lingkungan stockpile Coal mining has positive impacts in the form of increasing the national economy and people's income. However, it also has negative impacts, including the decrease of environmental quality such as air, soil, and noise, as well as the potential for spontaneous combustion. The research was conducted to assess the technical and economic aspects of environmental management at coal stockpiles in the Tarahan Port Unit of PT Bukit Asam Tbk to support environmental sustainability. The technical assessment of stockpile environmental management was carried out by comparing observation results with the Environmental Management and Monitoring Plan Document (RKL/RPL) and Indonesia’s applicable Environmental Quality Standards. The economic assessment focused on the cost of environmental monitoring and management by observing the discrepancies between the planned and realization in the first and second quarters. The technical assessment results show that environmental management at the stockpile has been implemented effectively. Air quality parameters and noise levels remain below the established standards, soil quality is classified good as indicated by vegetation growth, and no spontaneous combustion occurred during the observation period. The economic assessment revealed a discrepancy of 2.02% between the planned cost of IDR 121,183,548 to the actual realization of IDR 123,641,668. This increase was attributed to the construction of a dust reduction system and an operational chimney for the 2X8 MW Steam Power Plant, through the use of Electrostatic Precipitators. The study recommends a detailed inventory of environmental cost plans and potential cost escalation to anticipate risk factors. It also highlights the need for regular maintenance of machines that are known to frequently produce emissions. These efforts are expected to reduce the emissions and lower the costs of environmental management and monitoring. Pertambangan batubara memberikan dampak positif dalam meningkatkan perekonomian negara dan pendapatan masyarakat. Di sisi lain juga memberikan dampak negatif berupa menurunnya kualitas lingkungan hidup, seperti kualitas udara, tanah, kebisingan, dan potensi swabakar. Penelitian ini bertujuan untuk menilai kualitas pengelolan lingkungan stockpile batubara Unit Pelabuhan Tarahan PT Bukit Asam Tbk secara teknis dan ekonomis untuk lingkungan berkelanjutan. Penilaian teknik pengelolaan lingkungan stockpile dilakukan dengan melihat kesesuaian hasil observasi dengan dokumen rencana pengelolaan/pemantauan lingkungan (RKL/RPL), dan Standar Mutu Lingkungan yang berlaku di wilayah Indonesia. Penilaian ekonomi dilakukan pada biaya pemantauan dan pengelolaan lingkungan dengan mengamati ketidaksesuaian antara rencana dan realisasi dengan Kuartal I dan II. Hasil penilaian teknis menunjukkan bahwa pengelolaan lingkungan hidup di stockpile sudah dilaksanakan dengan baik, terlihat dari parameter kualitas udara dan tingkat kebisingan masih di bawah baku mutu lingkungan yang ditetapkan, kualitas tanah tergolong baik, terbukti dengan tumbuhan yang tumbuh, dan untuk swabakar tidak pernah terjadi selama masa pengamatan. Penilaian ekonomi pengelolaan lingkungan yang direncanakan dengan realisasi terdapat ketidaksesuaian sebesar 2,02% dari rencana semula sebesar Rp 121.183.548 menjadi Rp 123.641.668. Peningkatan ini disebabkan oleh pembangunan sistem peredam debu dan cerobong operasional Pembangkit Listrik Tenaga Uap 2X8 MW, melalui penggunaan Electrostatic Precipitator. Penelitian ini merekomendasikan inventarisasi rinci rencana biaya lingkungan dan eskalasinya guna mengantisipasi faktor risiko dan juga melakukan perawatan mesin yang diketahui sering menghasilkan emisi. Dengan demikian emisi yang dihasilkan terpantau menurun, dan dana pengelolaan dan pemantauan lingkungan juga berkurang. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2025-04-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1595 10.30556/imj.Vol28.No1.2025.1595 Indonesian Mining Journal; Vol. 28 No. 1 (2025): Indoneisan Mining Journal, April 2025; 53-72 Indonesian Mining Journal; Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025; 53-72 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1595/1125 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1605 2025-03-17T18:26:44Z imj:ART

GLOBAL CRITICAL MINERAL REVIEW AND CHALLENGES ON ITS EXPLORATION IN INDONESIA REVIEW MINERAL KRITIS GLOBAL DAN TANTANGAN EKSPLORASINYA DI INDONESIA Rizal, Khairu Nurkhamim Idrus, Arifudin potential critical minerals global REE geology exploration mineral potensi mineral kritis LTJ global geologi eksplorasi mineral Global critical minerals will highlight critical minerals such as lithium, cobalt, rare earth elements (REEs) and nickel that are critical in the clean energy transition. The analysis also covers the distribution of critical minerals in different regions of the world, including Europe, Africa, the Middle East, and Asia. It also discusses challenges in the extraction and processing of critical minerals and implications for sustainable exploration practices. The method used was a literature review of journals. The results show that countries such as Australia, the Democratic Republic of Congo, and China have significant critical mineral reserves. However, the African continent also has great potential in providing critical minerals needed for the clean energy transition. Therefore, emphasizing the importance of securing a reliable supply of critical minerals to support industrial and technological ambitions. In conclusion, then, with Australia, China, and Africa as major providers of clean energy, the provision of critical minerals such as nickel, lithium, cobalt, and REEs is essential for the clean energy transition and to control processes and reduce production costs, improve geological data and laboratory facilities for analysis are required. Indonesia has significant reserves for the global transition to clean energy and technological advancement. Hence, it is strategically positioned in the global mineral market as it becomes a focal point for geopolitical competition, especially between major powers. The regulatory framework in Indonesia can be complex and can pose challenges for foreign investment to enter, so addressing these challenges through increased research and regulatory alignment will be critical to unlocking Indonesia's abundant REE resources and meeting global demand. Mineral kritis global akan menyoroti mineral-mineral kritis seperti litium, kobalt, logam tanah jarang (LTJ), dan nikel yang sangat penting dalam transisi energi bersih. Analisis ini juga mencakup distribusi mineral kritis di berbagai wilayah dunia termasuk Eropa, Afrika, Timur Tengah, dan Asia. Selain itu juga membahas tantangan dalam ekstraksi dan pengolahan mineral kritis serta implikasi untuk praktek eksplorasi yang berkelanjutan. Metode yang digunakan yaitu literatur review dari jurnal. Hasil penelitian menunjukkan bahwa negara-negara seperti Australia, Republik Demokratik Kongo, dan Cina memiliki cadangan mineral kritis yang signifikan. Namun, benua Afrika juga memiliki potensi besar dalam menyediakan mineral kritis yang diperlukan untuk transisi energi bersih. Oleh karena itu, menekankan pentingnya mengamankan pasokan mineral kritis yang dapat diandalkan untuk mendukung ambisi industri dan teknologi. Maka, kesimpulannya dengan Australia, Cina, dan Afrika sebagai penyedia utama energi bersih, penyediaan mineral kritis seperti nikel, litium, kobalt, dan LTJ sangat penting untuk transisi energi bersih dan untuk mengontrol proses dan mengurangi biaya produksi, diperlukan peningkatan data geologi dan fasilitas laboratorium untuk analisis. Indonesia memiliki cadangan yang signifikan untuk transisi global menuju energi bersih dan kemajuan teknologi, maka Indonesia berada pada posisi strategis dalam pasar mineral global karena menjadikannya titik fokus persaingan geopolitik, terutama antara negara-negara besar. Kerangka peraturan di Indonesia bisa jadi rumit dan dapat menimbulkan tantangan bagi investasi asing untuk masuk, maka mengatasi tantangan-tantangan ini melalui peningkatan penelitian dan penyelarasan regulasi akan sangat penting untuk membuka sumber daya LTJ Indonesia yang melimpah dan memenuhi permintaan global. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-10-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1605 10.30556/imj.Vol27.No2.2024.1605 Indonesian Mining Journal; Vol. 27 No. 2 (2024): Indonesian Mining Journal, October 2024; 97 - 123 Indonesian Mining Journal; Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024; 97 - 123 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1605/1104 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1608 2025-03-17T18:26:44Z imj:ART

DISTRIBUTION AND CHARACTERISTICS OF ULTRAMAFIC ROCKS AS POTENTIAL NICKEL LATERITE AND THEIR RELATION TO CARBON STORAGE IN SOROWAKO REGION SEBARAN DAN KARAKTERISTIK BATUAN ULTRAMAFIK SEBAGAI POTENSI NIKEL LATERIT SERTA KAITANNYA DENGAN PENYIMPANAN KARBON PADA DAERAH SOROWAKO Sambodo, Tri Hananto Priyo Sukiyah, Emi Hutabarat, Johanes ultramafic rocks nickel laterite carbon capture Sorowako sulawesi batuan ultramafik nikel laterit perangkap karbon Sorowako Sulawesi Ultramafic rocks, as the main raw material for the formation of nickel laterite in nature, are important object to study and explore for their availability since nickel is very important mineral in producing batteries for electric cars which is expected to reduce carbon emissions in the future. Along with that, the storage of carbon dioxide in ultramafic rocks is considered as one of the safest storage method because carbon dioxide reacts naturally with magnesium-rich minerals contained in these rocks. The reaction between carbon dioxide and magnesium-rich minerals such as olivine, pyroxene, and serpentine will produce magnesite (MgCO3), which is more stable in nature. Ultramafic rocks have wide distribution in southeastern arm of Sulawesi Island, especially in Sorowako and the surrounding areas. The method used in this research is an observation method on outcrops and supported by laboratory analysis. Ultramafic rocks in Sorowako area have wide distribution and have varying degrees of serpentinization. The magnesium (Mg) element contained in the research area is widely spread as well as the development of geological structure allows the potential development of ultramafic rocks as carbon storage. Batuan ultramafik sebagai bahan baku utama pembentukan nikel laterit di alam menjadi objek yang penting untuk dikaji dan dieksplorasi keterdapatannya karena nikel merupakan mineral yang sangat penting dalam pembuatan baterai mobil listrik yang mana diharapkan dapat mengurangi emisi karbon dimasa depan. Sejalan dengan itu, penyimpanan karbon dioksida pada batuan ultramafik dianggap sebagai salah satu metode penyimpanan yang aman karena karbon dioksida direaksikan secara alami dengan mineral yang kaya unsur magnesium (Mg) yang terkandung dalam batuan tersebut. Reaksi antara karbon dioksida dengan mineral kaya magnesium seperti olivin, piroksen, dan serpentin menghasilkan mineral magnesit (MgCO3) yang bersifat lebih stabil di alam. Batuan ultramafik memiliki sebaran yang luas di lengan tenggara pulau Sulawesi khususnya daerah Sorowako dan sekitarnya. Metoda yang digunakan dalam penelitian ini adalah metoda pengamatan pada singkapan batuan di daerah Sorowako dan sekitarnya, didukung dengan analisis laboratorium. Batuan ultramafik daerah Sorowako dan sekitarnya memiliki sebaran yang luas serta memiliki derajat serpentinisasi yang bervariasi. Unsur magnesium (Mg) yang terkandung di daerah penelitian yang tersebar luas serta struktur geologi yang berkembang memungkinkan pengembangan potensi batuan ultramafik sebagai penyimpan karbon. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-10-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1608 10.30556/imj.Vol27.No2.2024.1608 Indonesian Mining Journal; Vol. 27 No. 2 (2024): Indonesian Mining Journal, October 2024; 63 - 72 Indonesian Mining Journal; Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024; 63 - 72 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1608/1101 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1623 2026-03-17T13:06:14Z imj:ART

GEOTECHNICAL EVALUATION OF LANDSLIDE THROUGH A BACK ANALYSIS APPROACH ON THE DISPOSAL AREA SLOPE AT PIT 'X', TANJUNG ENIM, SOUTH SUMATRA Bahasa Inggris EVALUASI GEOTEKNIK KELONGSORAN DENGAN PENDEKATAN ANALISIS BALIK PADA LERENG AREA DISPOSAL PIT 'X', TANJUNG ENIM, SUMATRA SELATAN Sugiawati, Gisa Nurputri Sophian, Raden Irvan Alfadli, Muhammad Kurniawan Khoirullah, Nur Putra, Meilan Aditya disposal area back analysis Slope stability analysis safety factor 3D-limit equilibrium method area disposal analisis balik analisis kestabilan lereng faktor keamanan metode kesetimbangan batas In open pit mining, the main activities include excavating the material from its original state and transporting it to the disposal area or stockpile, which forms an embankment. Slope stability in the disposal area should be monitored regularly to prevent losses caused by landslides. If a landslide occurs, it is important to identify the cause as a basis for recommending new slope design and implementing appropriate engineering measures to prevent future landslide occurrences. This study was conducted on a slope that had experienced a landslide in the Pit 'X' disposal area, Tanjung Enim, South Sumatra. This study aims to analyze the cause of the landslide by using a back analysis approach. Slope stability analysis was conducted using the Morgenstern-Price boundary equilibrium method, with failure probabilities calculated using Slide 2 software. Input data consisted of cohesion, internal friction angles, and unit weight of slope material. Based on the slope stability analysis, landslides occurred on slopes with a safety factor of 1 and a 40% probability of failure. This was caused by a 67.43% decrease in cohesion caused by the water-saturated condition of the clay material and the influence of the steep slope geometry. The proposed engineering solutions include slope grading, which increases the factor of safety by 30.31%, and the addition of counterweights, which further increases the factor of safety by 32.10%. Pada kegiatan penambangan terbuka, aktivitas utama meliputi penggalian material dari kondisi aslinya dan pengangkutannya ke lokasi pembuangan atau penimbunan, yang pada akhirnya membentuk geometri timbunan. Stabilitas lereng pada area disposal perlu dipantau secara berkala untuk mencegah kerugian akibat longsor. Apabila longsor terjadi, identifikasi penyebabnya menjadi penting sebagai dasar untuk merekomendasikan desain lereng baru serta melakukan rekayasa yang tepat guna mencegah longsor di masa mendatang. Penelitian ini dilakukan pada lereng yang telah mengalami longsor di area disposal Pit 'X', Tanjung Enim, Sumatera Selatan, dengan tujuan untuk menganalisis penyebab longsor menggunakan pendekatan analisis balik. Analisis kestabilan lereng dilakukan dengan menggunakan metode kesetimbangan batas Morgenstern-Price, dengan probabilitas kelongsoran yang dihitung menggunakan perangkat lunak Slide 2. Data yang digunakan terdiri dari kohesi, sudut geser dalam, dan unit weight material lereng.  Hasil analisis menunjukkan bahwa longsor terjadi pada lereng dengan faktor keamanan (FK) sebesar 1 dan probabilitas kegagalan mencapai 40%, yang disebabkan oleh penurunan kohesi hingga 67,43% akibat jenuhnya material lempung serta pengaruh geometri lereng yang curam. Rekayasa yang dapat dilakukan adalah dengan melakukan pelandaian pada lereng yang dapat meningkatkan nilai faktor keamanan sebesar 30,31% dan melakukan penambahan penahan pada kaki lereng yang dapat meningkatkan faktor keamanan sebesar 32,10%. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2025-10-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1623 10.30556/imj.Vol28.No2.2025.1623 Indonesian Mining Journal; Vol. 28 No. 2 (2025): Indonesian Mining Journal, October 2025; 73-84 Indonesian Mining Journal; Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025; 73-84 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1623/1142 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1628 2025-10-27T13:41:08Z imj:ART

LANDSLIDE PROBABILITY IN THE EAST ASAM DUMP IN PIT AREA OF PT ARUTMIN INDONESIA CONCESSION AREA ASAMASAM MINE, SOUTH KALIMANTAN PROBABILITAS LONGSOR TIMBUNAN DI AREA IN PIT DUMP ASAM TIMUR DAERAH KONSESI PT ARUTMIN INDONESIA TAMBANG ASAMASAM, KALIMANTAN SELATAN Fahrezi, Muhammad Akmal Zakaria, Zulfiadi Khoirullah, Nur Laksana, Prima disposal area slope stability slope failure probability slope stability simulation area pembuangan kestabilan lereng probabilitas kelongsoran simulasi kestabilan lereng Open pit mining involves excavation of soil and overburden, which requires a well-planned disposal area to maintain stockpile stability. This is achieved through an analysis of soil bearing capacity and slope stability. The research was conducted at the ASTIM In Pit Dump (IPD) using actual materials. Data were obtained from direct shear tests and physical properties tests, then statistically analyzed to determine the average value, standard deviation, and minimum and maximum relative values. These data were subsquetly input into geotechnical software to perform a slope stability analysis under pessimistic conditions, including water-saturated slopes with a horizontal seismicity coefficient of 0.045. The simulation results did not meet the stability criteria, yielding a safety factor of 0.647. Therefore, engineering design modifications were necessary, including widening the slope angle to 7.61°, consisting of six steps with a level height of 5 meters, a width of 30 meters, and a slope angle of 25°. This redesign resulted in a safety factor (SF) of 1.254 which meets slope stability criteria based on Bowles (1989) and a probability of failure (PoF) of 4.1%, in accordance with the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018. Penambangan terbuka melibatkan penggalian tanah dan lapisan penutup yang membutuhkan area pembuangan yang dirancang dengan baik untuk menjaga kestabilan timbunan melalui analisis daya dukung tanah dan kestabilan lereng. Penelitian ini dilakukan di In Pit Dump (IPD) ASTIM menggunakan material aktual dengan data diperoleh dari uji geser langsung dan uji sifat fisik, kemudian dianalisis secara statistik untuk menghitung nilai rata-rata, standar deviasi, serta nilai relatif minimum dan maksimum. Data tersebut kemudian dimasukkan ke dalam perangkat lunak geoteknik untuk dilakukan analisis kestabilan lereng pada kondisi pesimis, yaitu lereng jenuh air dengan koefisien kegempaan horisontal sebesar 0,045. Hasil simulasi menunjukkan bahwa lereng tidak memenuhi kriteria kestabilan, dengan nilai faktor keamanan sebesar 0,647. Oleh karena itu, perlu dilakukan rekayasa desain dengan memperlebar sudut lereng menjadi 7,61° yang terdiri atas 6 undakan dengan tinggi jenjang 5 meter, lebar 30 meter, dan sudut 25°. Desain ini menghasilkan faktor keamanan (FK) sebesar 1,254 yang memenuhi kriteria kestabilan lereng berdasarkan Bowles (1989) dan probabilitas keruntuhan (PK) 4,1% sesuai dengan Kepmen ESDM No. 1827 K/30/MEM/2018. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2025-04-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1628 10.30556/imj.Vol28.No1.2025.1628 Indonesian Mining Journal; Vol. 28 No. 1 (2025): Indoneisan Mining Journal, April 2025; 17-29 Indonesian Mining Journal; Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025; 17-29 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1628/1122 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1629 2024-12-31T15:34:20Z imj:CVR

Front Cover Cover Depan Front Cover Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1629 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1629/1098 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1630 2024-12-31T15:34:20Z imj:CVR

From the Editor From the Editor Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1630 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1630/1096 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1631 2024-12-31T15:34:20Z imj:CVR

Table of Contents Daftar Isi Table of Contents Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1631 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1631/1095 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1632 2024-12-31T15:34:20Z imj:CVR

Abstract Index Index Abstrak Abstract Index Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1632 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1632/1097 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1633 2024-12-31T15:34:20Z imj:APX

Note for Contributor Note for Contributor Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1633 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1633/1099 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1634 2024-12-31T15:34:20Z imj:APX

Back Cover Back Cover Balai Besar Pengujian Mineral dan Batubara tekMIRA 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1634 Indonesian Mining Journal; Vol. 27 No. 1 (2024): Indonesian Mining Journal, April 2024 Indonesian Mining Journal; Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1634/1100 http://creativecommons.org/licenses/by-nc/4.0

oai::article/1641 2026-03-17T13:06:13Z imj:ART

HARNESSING ADVANCED MATERIALS AND EXTRACTIVE METALLURGY FOR OPTIMIZING MINERAL AND ENERGY RESOURCE VALUE CHAINS Nopriantoko, Rahadian advanced materials extractive metallurgy sustainability mineral and energy resource value chains material maju metalurgi ekstraktif keberlanjutan mineral dan energi rantai nilai sumber daya This research examines recent advancements in advanced materials and extractive metallurgy for optimizing mineral and energy resource value chains. The study's purpose is to synthesize current research, emerging technologies, and future prospects in resource value chain optimization. The novelty lies in the comprehensive analysis of synergies between advanced materials, innovative extractive techniques, and cutting-edge technologies like AI and biotechnology. A systematic literature review methodology was employed, focusing on peer-reviewed papers from 2018 onwards, with data extracted and analyzed using standardized forms and qualitative software. Key findings include significant improvements in extraction efficiency and selectivity through nanostructured materials and high-performance membranes, with lab-scale efficiency increases of 50-70% translating to 20-30% in industrial settings. Bio-inspired techniques in extractive metallurgy have shown promise, reducing energy consumption by up to 40% in some processes. The integration of AI and machine learning has demonstrated potential for optimizing complex ore beneficiation, improving overall recovery rates. The study discusses challenges in scaling up laboratory innovations to industrial applications and the need to address hidden environmental costs of new technologies. Limitations include the exclusion of non-English studies and potential delays in reflecting very recent advancements. This review contributes to the field by offering insights for researchers, industry professionals, and policymakers to foster sustainable and efficient resource utilization practices, highlighting the transformative potential of integrating advanced materials, extractive metallurgy innovations, and emerging technologies in reshaping resource value chains. Balai Besar Pengujian Mineral dan Batubara tekMIRA 2025-10-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1641 10.30556/imj.Vol28.No2.2025.1641 Indonesian Mining Journal; Vol. 28 No. 2 (2025): Indonesian Mining Journal, October 2025; 101-117 Indonesian Mining Journal; Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025; 101-117 2527-8797 0854-9931 eng https://jurnal.tekmira.esdm.go.id/index.php/imj/article/view/1641/1143 http://creativecommons.org/licenses/by-nc/4.0 8e1e3a973935d4a4bab6a778d99f4e3f