釜石鉱業所選鉱場の概況

抄録

Kamaishi Mine has two kinds of ore dressning plant. One is a magnetic separation plant for iron ore, and the other is a flotation plant for copper ore.
ore. The magnetic separation plant treats a magnetite ore containing 21-25% magnetic iron and has a capacity of 3, 200t per day. The production of the concentrate, which has average grade is 58% iron, is 430, 000 t per year.
The kinds of ores treated at the copper plant are three as follows:
(1) The copper bearing low grade iron ore which has 13-15% magnetic iron and 0.3-0.8 copper.
(2) The mixed ore of chalcopyrite and pyrrhotite which has 7-10% iron and 1.7-2.5% copper.
(3) The wet tailing from magnetic separation plant which has 0.5-0.7% magnetic iron and 0.15-0.2% copper.
Total capacity of the copper plant is 2, 560t per day and it produces the copper concentrate of 17-18% copper and the magnetite concentrate of 57-59% iron.
Average recoveries are about 90% for copper and 90% for magnetic iron.