The Exploration of the Shimokawa Mine
1971 Volume 21 Issue 106 Pages 104-118
Details
1971 Volume 21 Issue 106 Pages 104-118
The recent exploration in the neighbouring areas of the Shimokawa Mine, brought about several geological data which made the discovery of new orebodies possible in the deeper part of the producing area and the Nakanosawa area.
The important geological data obtained are as follows:
1. The ore deposits occur near the boundary between diabase and slate at, the eastern part of the so-called diabase complex. Diabase and slate strike at NNW and dip 50-70°E.
2. Diabase can be classified into two types; the "effusive type" and the "intrusive type". There is no correlation between the occurrence of the ore deposits and the types of diabase.
3. The ore deposits are slightly oblique to the direction of diabase. They are arranged "en echelon".
4. The wall rocks near the ore bodies is intensely sheared and is characterized by amphibolitization, chloritization and silicification-sericitization.
5. The ore bodies consist of some respective bonanzas which are oblique to the shoot of the ore bodies. The bonanzas are arranged "en echplon".
