The copper deposit of the Hamanaka area is located in the southern part of East Hokkaido. This ore deposit was discovered in the outer zone of Kuril arc, and is considered to be originated by the igneous activies of alkaline basic rocks. It must be a remarkable thing. The geological complex developed in the neighbourhood of this ore deposit are the Hamanaka formation with alkaline rocks of upper Cretaceous and some deposits of Quaternary age. The ore deposit is generally observed as massive or stratified bodies in the alternation member of black mudstone and tuffaceous sandstone, and these ore bodies consist of yellowish massive ore and dark gray Kuroko-like ore. The important minerals are pyrite and chalcopyrite, with minor quantities of sphalerite, galena, marcasite, quartz, and rarely calcite and barite. After all, this ore deposit is considered to be a cupriferous iron sulfide deposit from its geological situation, occurrence of ore bodies, and its distinctive character of ore. And it is an ore deposit that have been replaced by hydrothermal solutions.
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Tetsuo Fujiwara (1959) studied this question.
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