Exploration in the Southern Part of the Shimokawa Mine, Hokkaido

Abstract

A cupriferous pyritic ore deposit was discovered by recent exploration drilling works at the southern part of the Shimokawa mine. The deposit occurs near the boundary between diabase and phyllite in the eastern part of the so-called diabase complex. The deposit consits of several lenticular orebodies and its total length is about 1800 m. The ore zone strikes NNW and dips east at 50 to 70 degrees. The elongated directions of individual orebodies are slightly oblique to the general strike of diabase body. The orebodies are arranged en echelon fashion. The ores are divided into massive and banded types and their major metallic minerals are pyrite, pyrrhotite, chalcopyrite, and sphalerite.