Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM ANODE SLIME
No full textAnode slime is a byproduct collected from electro refining copper process. The valuable metals present in the slime are Au, Ag, Pt, Pd and Pb. Yet, the slime has not been processed in Indonesia but sent to another country. Extracting the gold from anode slime had been attempted in the laboratory by applying wet chlorination method. Sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2) served as the oxidizing agents. Effects of various parameters such as solvent concentration, leaching time and temperature on the percent extraction of gold were studied. The optimum recovery of gold with NaOCl is 98.86 % Au at leaching temperature of 40°C, solvent concentration 5 M, NaOCl 5 mL and 20% solid after 120 minutes leaching time. Silver loss under this condition is 2–3%. Leaching the gold by H2O2 provided the highest gold extraction of 99.99% Au at 7M HCl concentration, temperature 60°C, H2O2 0.5 M, leaching time 180 minutes, and 20% solid. The silver loss under this condition is only 0.6%
STUDY OF COMPRESSIONAL AND SHEAR WAVE VELOCITY TESTS IN THE LABORATORY AND FIELD APPLIED TO SEDIMENTARY ROCKS OF RANTAU NANGKA DISTRICT, SOUTH KALIMANTAN
No full textCompressional (Vp) and shear (Vs) wave velocities within rocks are often investigated by testing in the laboratory because it is easier and cheaper. However, it is more confidence with investigation results derived from the field due to the actual situation and conditions. In the laboratory, the wave velocities are commonly measured using ultrasonic pulse velocities test. But in the field, the velocities are commonly measured directly by several methods such as cross-hole seismic, down-hole seismic, suspension logging, seismic reflection, seismic refraction and spectral analysis of the surface wave. In the present study of field insitu tests, it has used down-hole seismic method. The field insitu test is more expensive than the laboratory test. Hence, this study would evaluate and compare data derived from both of laboratory and field insitu tests. Based on the measurements correlation, it is found that regression equation for each parameter are ... for compressional wave velocities, ... for shear wave velocities, xxxxx for shear modulus, ... for ... modulus of elasticity, for bulk modulus and ... for Lame constants. This equation can be applied to correct the laboratory test data in order to get close results between the laboratory and field insitu tests
IMPACT OF CORPORATE SOCIAL RESPONSIBILITY (CSR) IN INDONESIA: A CASE STUDY OF GENERAL MINING INDUSTRIES
No full textMining companies as the stakeholder of the community should implement community development (CD) as a translation of corporate social responsibility (CSR). In other words, they should involve business activities for developing humankind. The application of CSR in the general mining in Indonesia is expected to encourage min- ing company to allocate its profit for developing the local people who live around mining area. The quantitative models for evaluating the CD impact include net social gains (NSG) and net gain coefficient (NGC). The NGC shows that the value between 1 to 23% of the companies’ revenue has satisfied the local people. The values could be increased in the future to make beneficial for the regional sustainable development
ORGANIC PETROLOGY OF SELECTED COAL SAMPLES OF EOCENE KUARO FORMATION FROM PASIR AREA-EAST KALIMANTAN
No full textEight samples of Eocene Kuaro Formation were taken from Pasir area, East Kalimantan to be examined their lithotype, maceral, mineral matter and rank of the coals in terms of geologic factors. The samples were analysed according to the ASTM (2009). The result shows the dominance of brighter lithotypes and vitrinite over liptinite, inertinite and mineral matter. There is a strong correlation between lithotype and maceral composition of the coals. The brighter lithotypes have high vitrinite content. This indicates that the coals were formed under a wet condition. The presence of high content of pyrite and calcite reflects marine incursion, in which the coals were deposited under paralic and shallow marine environment. Thus, this environment strongly supports the above correlation, where the coals were formed under the wet condition. The slight differences in the coal type can be caused by the relatively short period of peat accumulation and similarity in climate during the peat formation, and slight differences in geological setting during the Eocene period. Vitrinite reflectance (Rvmax%) values show similar ranks (mostly subbituminous A to high volatile bitumi- nous C) with a slight difference due to the thickness of cover during the coalification
GEOLOGIC ASPECTS CONTROLLING MACERAL AND MINERAL MATTER CONTENT OF SATUI COALS- SOUTH KALIMANTAN
No full textCoal deposits were formed in Tertiary sequexnces in Satui area of Asem-Asem Basin, South Kalimantan. The coals were deposited in paralic to neritic environments. Lithotype of Satui coals is dominated by bright- banded and banded. Petrographically, vitrinite and liptinite are the dominant macerals in the Eocene coals. Inertinite is a minor component. Mineral content is relatively high in most of the coals. There is a significant relationship between lithotype and petrographic observations; the brighter coal is in association with the vitrinite-rich coal. The differences in the coal type are due to the interaction of geologic factors. There is a good correlation among lithotype, petrographic composition and geologic aspects that clearly influence the characteristics of the coals. The ranks of the Eocene coals ranging from brown coal to high volatile bitumi- nous indicate a normal regional coalification