Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Occurrances of Gold and Base-metal Mineralizations at the Arinem Area, Western Java, Indonesia

The Indonesia archipelago, 13,000 islands stretching for 5,200 km, contains an appreciable extent of Earth’s Cenozoic volcano-plutonic arcs, and is the location of 15% of its historically active volcanoes. These arcs total approximately 9,000 km in length, with some 80% comprising segments containing known mineral deposits. Indonesia metallogeny is dominated by porphyry Cu and epithermal Au deposits (Carlile & Mitchell, 1994).Arinem area is located at the south of Mt. Papandayan active volcano and is about 60 km southeast of Bandung City. The main mineralization in the area is represented by Arinem vein zone with total length about 5,900m, including unexposed vein zone at the south. Anomalies of Au, Ag, Cu, Pb and Zn elements were observed based on the evaluation of geochemical data of stream sediments. Distribution of Au anomaly has good correlation with Ag, Cu, Pb and Zn ones. Several drill holes data indicate that the occurrence of gold-silver is intimately associated with base metal mineral of copper, lead and zinc.