Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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MINERALOGICAL CHARACTERS OF KARANG PANINGAL EPITHERMAL VEIN DEPOSITS, WEST JAVA
No full textKarang Paningal gold-ore deposits belong to the epithermal deposits. As hydrothermal deposits, the alter- ation that occurs in this area comprises argillitization, sericitization and silicification. The gold is included within several veins that perform three texture types, namely chalcedony, comb and vuggy. Based on its mineral contents and vein deposit types, mineralization at Karang Paningal took place in two stages that was early epithermal process producing comb-vuggy vein deposit and final epithermal deposit retaining chalcedony vein deposit. Zone of prospective mineralization takes place within vein and rocks beneath and above vein
MARBLE WASTE AND FLY ASH UTILIZATIONS FOR FINE CERAMIC RAW MATERIALS
No full textThe possibility of using marble waste and fly ash taken from a textile industry as raw materials for producing fine ceramics was studied. Besides those two materials, clay was also used as the formed agent for ceramic body. There were four compositions noted as T1, T2, T3 and T4 that consist of marble waste 10 %, fly ash 10– 25 % and clay 65 – 80 %. They were formed by the method of slip casting.The tests pieces of these fine ceramic bodies were then fired at temperature of 600 °C. The glaze were applied to the bodies and further fired at temperature of 1150 °C in a gas kiln. Characterization results of those four composition tests show that the composition of T2 (70 % of clay, 10 % of marble waste and 20 % of fly ash) gives the best result
ENVIRONMENTAL IMPACT OF ARTISANAL GOLD MINING AT CIKANGEAN RIVER IN MULYAJAYA VILLAGE, GARUT, WEST JAVA
No full textThe 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
THE CURRENT STATUS OF IRON MINERALS IN INDONESIA
No full textIndonesia has great iron mineral resources, comprising primary iron ore (17 %), iron sand (8 %) and lateritic iron ore (75 %). Nowadays, Indonesia’s primary iron (hematite, magnetite) has not been em- powered yet, due to the scattered area of the resources location. Meanwhile, national iron sand is commonly used for cement industries and its potency has not supported national steel industries yet because of low iron content (45-48 %). However there is an opportunity to be processed by using Ausmelt process technology. At present, lateritic iron ore is being used as coal liquefaction catalyst in the form of limonite, but hydrometallurgy would be a promising solution to beneficiate lateritic iron ore for steel industries
MAGNETIC SUSCEPTIBILITIES DISTRIBUTION AND ITS POSSIBLY GEOLOGICAL SIGNIFICANCE OF SUBMERGED BELITUNG GRANITE
No full textAn appraisal of the marine magnetic anomalies over the Belitung water provides information on the distribution of the magnetic susceptibility values. The 0.001 to 0.003 cgs unit contour values charac- terize the zone of submerged Belitung granite coincides with the zone of less than 50 nT total mag- netic anomaly contour value. Susceptibilities distribution analyses reveal a strong correlation between magnetic susceptibility and type of granites. The nature of submerged Belitung intrusive is suggested to be granitic pluton of biotite-granite that is associated with cassiterite minerals
