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 C...
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.