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Bachtiar Effendi
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INDONESIA
Indonesian Mining Journal
Published by Balai Besar Pengujian Mineral dan Batubara tekMIRA
ISSN : 08549931     EISSN : 25278797     DOI : 10.30556/imj
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
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 : Energi (semua kategori) - Energi (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 12 No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009" : 5 Documents clear
ENVIRONMENTAL IMPACT OF ARTISANAL GOLD MINING AT CIKANGEAN RIVER IN MULYAJAYA VILLAGE, GARUT, WEST JAVA Retno Damayanti; M. Lutfie Lutfie
Indonesian Mining Journal Vol 12 No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol12.No1.2009.571

Abstract

The artisanal and small scale gold mining usually utilize mercury for its gold recovery. Mercury is used as the best alternative by many miners due to its effectiveness, simple and cheap process for gold recovery. The increasing mercury utilization motivates tekMIRA to prevent more pollution caused by uncontrolled or incorrect mercury utilization. For this purpose, the artisanal gold mining located in Mulyajaya Village, Garut was chosen for monitoring mining activities. Grab sampling method was used to evaluate environmental monitoring on terrestrial water and its sediment, soil and tailing surrounding the artisanal gold mining. The monitoring results show that mercury was found in all waters and sediment surrounding the artisanal gold mine. The mercury concentration in river sediment was around 0.08 – 0.15 ppm and this was higher than its concentration in the river water (0.0002 ppm). The same concentration occurred at the upstream and downstream (0.0002 ppm). The mercury concentration in the sediment coming from sedimentation pond were 2.27 – 7.60 ppm. Eventhough the mercury was still in low concentration either in the water or in the sediment, a guidance should be delivered to the miners about the danger of mercury substances used in the mining activities.
GEOLOGIC AND PETROGRAPHIC ASPECTS FOR COAL EXPLORATION IN SANGATTA-EAST KALIMANTAN BINARKO SANTOSO; BUKIN DAULAY
Indonesian Mining Journal Vol 12 No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol12.No1.2009.572

Abstract

The Miocene Sangatta coals indicate similarities and differences in type and rank characteristics. The phenomena express the geological setting that includes the stratigraphic aspect and the pres- ence of intrusive body. The stratigraphic aspect relates to geologic age and cover thickness; the lower coal seam having a thicker cover has a higher rank than the upper coal seam. The intrusive body changes the rank of the coal up to semi-anthracite. The coals that are not affected by the intrusion have rank of brown coal to subbituminous. The rank of the coals increases from east to west toward the Meratus Range due to the cover thickness, where the western part has a thicker cover than the eastern part. These geological phenomena could be an exploratory target for the prospective coals.
OCCURRENCE OF PHILLIPSITE MINERAL IN SUB- SEAFLOOR OF ROO RISE-INDIAN OCEAN : A TECTONIC EROSION SYNTHESIS Dida Kusnida
Indonesian Mining Journal Vol 12 No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol12.No1.2009.573

Abstract

A single deep-sea core (MD982156) of 30.30 meters long which is obtained during the MD III-IMAGES IV Expedition from Roo Rise - Indian Ocean in 1998 was studied. Down to 30 meters of the core length, the sediment consists of abundance planktonic foraminiferas. Below 30 meters, it is mostly composed of phillipsite mineral-rich sediment that is associated with nannoplanktons.The Paleocene authigenic phillipsite minerals associated with nannoplanktons is separated from Late Miocene to Holocene planktonic foraminiferas rich-sediments by hiatus. This hiatus or non deposi- tional in Roo Rise suggest be triggered by long Cenozoic tectonic erosion.
DEVELOPMENT OF CYCLONE COAL BURNER FOR FUEL OIL BURNER SUBSTITUTION IN INDUSTRIES Sumaryono SUMARYONO
Indonesian Mining Journal Vol 12 No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol12.No1.2009.574

Abstract

The high fuel oil price forces the industries to seek cheaper alternative energy. Coal is the most promising alternative energy in Indonesia. To face this situation, R & D Centre for Mineral and Coal Technology (tekMIRA) has developed a cyclone burner. This burner has the combustion characteris- tics nearly the same as the fuel oil burner that this burner may alter the fuel oil burner in various industrial facilities, such as steam boiler, oil heater, rotary dryer, metal smelter and heat exchanger. The cyclone burner combusting coal powder of -30 mesh may match the energy output of the former altered fuel oil burner. The burning of coal emits long flame and the combustion rate may be con- trolled by a variable feeder. It may be shut of and then put on instantaneously as it is practiced in oil burner. Fine adjustment of the coal and air supply were performed and this burner was set up in vertical and horizontal position. In this substitution 1 litre fuel oil was substituted by 1.5 up to 1.8 kg of coal of 5700 kcal/kg.
FINANCIAL ANALYSIS ON DEVELOPMENT OF COAL LIQUEFACTION PLANT IN INDONESIA USING BROWN COAL LIQUEFACTION (BCL) TECHNOLOGY MIFTAHUL HUDA; Granit Agustina; NINING S. Ningrum; BUKIN DAULAY
Indonesian Mining Journal Vol 12 No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol12.No1.2009.575

Abstract

Financial analysis of Mulia coal liquefaction plant has been conducted in the year 2002 and up dated in the year 2007. However, the increase of coal price, currently, has promoted coal companies to export their coal rather than to allocate it as raw material for coal liquefaction. To maintain the stability of coal supply in a liquefaction plant, the use of stranded mining coal as raw material for the plant should be studied. This study was aimed to conduct financial analysis of stranded coal from South Sumatera (Pendopo Coal) and to update the financial analysis of Mulia coal liquefaction. Discounted cash flow was used as the method for the analysis. The result indicates that with the oil price higher than US$ 70/bbl and coal price below US$ 25/ton, the Internal Rate of Return (IRR) of Pendopo coal liquefaction plant achieved value higher than 10%. Reducing corporate tax from 30% to 15% in- creased IRR value of approximately 1%. Meanwhile, by enlarging the plant scale from 3,000t/d to 12,000 t/d will increase the IRR value as much as 5%. On the other hand, the IRR of Mulia coal liquefaction plant was less than 9% when the oil price was lower than US$ 70/bbl and coal price was above US$ 55/ton.

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