Kuroko deposit - Kuroko deposit

Japanese: 黒鉱鉱床 - くろこうこうしょう（英語表記）kuroko deposit

Lenticular to massive polymetallic sulfide deposits associated with acidic volcanic rocks such as green tuff from the middle Miocene of the Neogene period in Japan. They contain many useful metals such as copper, lead, zinc, gold, and silver, and are of high grade, making them profitable. They usually contain 1-2% copper, 2-5% lead, 5-10% zinc, 1g/t gold, and several tens of g/t silver, with barite and pyrite also being recovered as by-products. They were also once an important source of gypsum. Kosaka, Hanaoka, and Shakanai in Akita Prefecture are typical examples, and all of them are among the largest mines in Japan.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本の新第三紀中新世中期のグリーンタフなどの酸性火山岩類に伴われるレンズ状～塊状の多金属硫化物鉱床。銅，鉛，亜鉛，金，銀などの多くの有用金属を含み，高品位であるために採算性がよい。ふつう銅1～2％，鉛2～5％，亜鉛5～10％，金1g/t，銀数十g/tを含むほか，重晶石，黄鉄鉱も副産物として回収される。またかつては，セッコウの重要な資源であった。秋田県の小坂，花岡，釈迦内などは典型的な例であり，いずれも日本屈指の大鉱山である。

出典　株式会社平凡社世界大百科事典第２版について　情報

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