Kounomai mine

Japanese: 鴻之舞鉱山 - こうのまいこうざん

A gold and silver mine located in northeastern Hokkaido, about 25km south of the downtown area of Monbetsu. It is located in the upper valley of the Mobetsu River. It was discovered in 1915. It was transferred to Sumitomo Metal Mining in 1917, and mining began the following year in 1918. There is a mining village, a smelter, and a settling pond. The deposit is an epithermal vein in which volcanic rock penetrates the Neogene layer, and is a quartz vein containing gold and silver. In 1971, the mine was reduced to one third in order to streamline operations. The annual production targets were set at 320kg of gold, 9.7t of silver, and 220t of ore processing per day. It was the largest gold mine in Japan, but closed in 1973 when gold was liberalized.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

北海道北東部，紋別市市街地の南方約 25kmにあった金銀鉱山。藻鼈川（もべつがわ）の上流河谷に位置する。1915年発見。1917年住友金属鉱山に移管され，翌 1918年から出鉱。鉱山集落，精錬所，沈殿池がある。新第三紀層を火山岩が貫いた浅熱水性鉱脈で，金銀を含む石英脈が鉱床。1971年鉱山合理化のため規模を 3分の1に縮小。年生産目標を，金 320kg，銀 9.7t，鉱石処理は 1日 220tとした。金産出量で日本一を誇っていたが，金の自由化を機に，1973年閉山。

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