Recent Prospecting of The Kamaishi Mine, Iwate Prefecture
With Special Refernce to the Discovery of No.7 Ore Body in the Shinyama Deposit
1966 Volume 16 Issue 76-77 Pages 116-123
Details
1966 Volume 16 Issue 76-77 Pages 116-123
The Kamaishi mine is well known as one of the typical contact-pyrometasomatic iron and copper deposits in Japan. Recently, No. 7 ore body was found in the Shinyama deposit by tracing the contact zone of limestone lenses and igneous rocks. The ore body shows the following characteristics:
In the upper part, there occurs a large amount of skarn minerals, and the nature of the ore body is almost the same as that of the other iron-copper deposits in the mine, but a copper-rich zone with green skarn occurs along the limestone in the middle part.
In the lower part, a skarnized zone between limestone and igneous rock is very narrow in width, in which high-grade magnetite ore and chalcopyrite ore are deposited with relatively small amounts of skarn minerals.
Formation of the iron-rich zone is controlled by the form of igneous rocks. Copper-rich zone is on the same horizon as No.4 copper ore body, and it sometimes branches out, forming some small ore bodics along dyke rocks.
