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INDONESIA
Indonesian Mining Journal
Published by PUSLITBANG Teknologi Mineral dan Batubara
ISSN : 08549931     EISSN : 25278797     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science
This Journal is published periodically two times annually : April and October, containing papers of research and development for mineral and coal, including exploration, exploitation, processing, utilization, environment, economics and policy. The editors only accept relevant papers with the substance of this publication.
Arjuna Subject : -
Articles 264 Documents
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A SHEAR TEST OF DEBRIS ROCK AT LABORATORY SCALE Saviqri Suryaputra; Made Astawa Rai; Nuhindro Priagung Widodo; Bob Andrea Lingga
Indonesian Mining Journal Vol 23, No 1 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 1, April 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No1.2020.1090

Abstract

As one of rock’s mechanical properties, the shear strength is one of the most significant factors that affect rock-dump slope stability. On previous research, one of the tests that needs to be conducted for shear strength characteristic estimation is the field-scale tilt test that requires a lot of expense and material. In this research, a direct shear test was conducted to 3 different mudstone specimens for modeling the Barton and Kjaernsli shear strength at laboratory-scale, using the fragment size of coarse (50 mm - 1 mm), medium (<1 mm – 0.25 mm), and fine (<0.25mm). Then, the results was compared to the shear strength of the debris rock that was come from the value of the equivalent roughness (R) both derived from back-calculated and empirical calculation. This research delivers the estimated shear strength that is more representative because the specimens were controllable in regards to its fragment size and composition. The more predominant big rock fragment in a composition, the bigger its back-calculated R-value. The obtained crushed rock shear strength with empirical R was lower in value compared to the one with back-calculated R.
Abstract Indext Tatang Wahyudi
Indonesian Mining Journal Vol 23, No 1 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 1, April 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No1.2020.1102

Abstract

ECONOMIC ANALYSIS OF MINI COAL GASIFIER (GasMin) COMMERCIALIZATION FOR SMALL AND MEDIUM INDUSTRIES (SMIs) Ijang Suherman
Indonesian Mining Journal Vol 23, No 1 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 1, April 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No1.2020.699

Abstract

The Research and Development Centre for Mineral and Coal Technology (tekMIRA) has conducted a research on the GasMin since 2011, and currently enters the commercialization stage with a partnership scheme (KSO). This technology is one solution to solve the problem regarding the availability of cheap, clean and sustainable energy as well as environmentally friendly which is specifically intended for SMIs. Economic analysis is one of the activities in the commercialization process. From the analysis results, it can be seen that the Net Present Value of IDR is 808,273,705, the Internal Rate of Return 28.68% per year and the Payback Period 3 years and 8 months. The three indicators show that the project is financially feasible, with a level of sensitivity to changes in production costs is up to a 5% increase, and a level of sensitivity to a decrease in selling prices is up to -4%. This economic analysis is very important for both tekMIRA as a technology provider to find out the value of technology, and its potential partners as input in making decisions as a partnership with tekMIRA.
APPLICATION OF CUCKOO SEARCH METHOD IN 3D SLOPE STABILITY ANALYSIS FOR LIMESTONE QUARRY MINE Masagus Ahmad Azizi; Irfan Marwanza; Nadya A. Hartanti; Muhammad K. Ghifari; Afiat Anugrahadi; Zulfahmi Zulfahmi
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1120

Abstract

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.
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 Karel Lutan Warda; Bagus Wiyono; Tedy Agung Cahyadi; Sigit Bagus Prabowo
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.994

Abstract

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.
SUBSIDENCE AND HEAT PROPAGATION MODELING ON THE UNDERGROUND COAL GASIFICATION (CASE STUDY AT MUARA ENIM FORMATION, SOUTH SUMATERA) Zulfahmi Zulfahmi; Ildrem Syafri; Abdurrokhim Abdurrokhim; Ridho Kresna Wattimena
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1132

Abstract

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.
MAKING A SYNTHETIC ZEOLITE FROM A RESIDUE OF BAUXITE WASHING Kukuh Nur Hidayat; Agus Wahyudi; Husaini Husaini
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1112

Abstract

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.
THE INFLUENCE OF STEAM DRYING PROCESS ON COMBUSTION BEHAVIOR OF INDONESIAN LOW-RANK COALS Datin Fatia Umar; Suganal Suganal; Ika Monika; Gandhi Kurnia Hudaya; Dahlia Diniyati
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1105

Abstract

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.
APPLICATION OF MAGNETIC AND INDUCED POLARIZATION METHOD FOR DELINEATING GOLD-BEARING VEIN ZONES AT CIBALIUNG, PANDEGLANG REGENCY, BANTEN Muhammad Sidiq; Y. Yatini; Agus Fajrin
Indonesian Mining Journal Vol 24, No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No1.2021.1133

Abstract

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.
LITHOGEOCHEMICAL EXPLORATION FOR DELINEATING PRIMARY GOLD OCCURRENCES IN WEST KAO AREA, NORTH HALMAHERA DISTRICT, NORTH MALUKU PROVINCE Arifudin Idrus; Fadlin Fadlin
Indonesian Mining Journal Vol 24, No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No1.2021.1173

Abstract

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.

Page 22 of 27 | Total Record : 264

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