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Occurrence of Placer Gold Deposits from the Takaoi Area of the Middle Kalimantan, Indonesia  

Kim In-Joon (Korea Institute of Geoscience and Mineral Resources)
Lee Jae-Ho (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.39, no.2, 2006 , pp. 191-212 More about this Journal
Abstract
Placer gold deposits is mainly distributed in the Takaoi area. The alluvium is unconsolidated or semiconsolidated deposit consisting of gravel, sand, and soil beds in ascending order. They unconformably overlies the Carboniferous-Permian schist and Cretaceous granodiorite substratum. Based on detailed facies analysis, the alluvium can be interpreted as a typical fluvial deposits containing gravel and sand beds of channel-fill unit and soil deposit of floodplain. Gold grains are included mainly in the gravel bed and vein quartz is only contained gold among all kinds of gravels. These features indicates that the source rock of the gold grain is vein quartz and gold grains are separated from vein quartz during transport and abrasion. The reserves of gold in this area reach to at least 792 kg.
Keywords
placer gold deposit; fluvial deposits; gravel bed; reserves of gold; Takaoi;
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