佐々連鉱山附近の地質と佐々連鉱床群について

抄録

The Sazare Mine is located east of the Besshi Mine. It was operated almost continuously from 1930 to 1945 under various cwners and milled 4, 500 t pm of ore containing 1.5% copper.
Later prospecting activities by the Sumitomo Metal Mining Co., Ltd. have been encouraging. In 1953, new ore bodies were discovered by extensive diamond drilling and as the result of development and exploration, it was found that the ore bodies, having an en echelon arrangement, have mutual continuity as mineralized layers. Both sides of the ore bodies can be traced for distances of about 2, 500m. From outcrops to deep levels, the west ore bodies contain more copper, a mine having an output of 350t pm in copper falls into the rank of an important mine in Japan. The bedded cupriferous pyritic deposits of the mine are found in a series of highly schistose green rocks belonging to the Yoshinogawa formation which are believed to be of pre-Carboniferous age (the Sambagawa metamorphic rocks), and lie on the south limb of the main anticline, called the Yakushi anticline. The present form of the ore bodies was controlled by a main and minor fold of different orientations which were formed after the deposition of the original, bedded, mineralized alyers. The direction of pitch of ore bodies is SW and coincides with that of the ores of the minor fold.