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Polymetallic Mineralization at the Nakakoshi Copper Deposits, Central Hokkaido, Japan

Abstract: Polymetallic mineralization at the Nakakoshi deposits, Kamikawa town, central Hokkaido, occur as fracture‐filling veins in Cretaceous slate of the Hidaka Supergroup. Ten veins have been recognized in NE‐SW and E‐W directions. Sericite in altered slate which is the host of the deposits, was dated at 31. 1 Ma, Oligocene in age.