A mercury mine in Kitami, Hokkaido. It was discovered in 1937 and developed by Nomura Mining from 1939. It is produced in association with metamorphic andesite, a Tertiary volcanic rock in the upper reaches of the Muka River, and is known for its particularly high natural mercury content. At its peak in 1944, annual production reached 196 tons, and in the early 1950s it remained at around 150 tons per year, but production subsequently declined due to resource depletion, falling prices, and reduced demand due to pollution issues, and the mine closed in 1973. Source : Heibonsha Encyclopedia About MyPedia Information |
北海道北見市にある水銀鉱山。1937年発見され,1939年から野村鉱業により開発された。無加川上流の第三紀火山岩である変朽安山岩に伴って産出され,特に自然水銀を多く含むことで知られた。最盛期の1944年には年産196tに達し,昭和30年代の前半にも年産150t前後を維持したが,その後資源の枯渇や価格の低下,公害問題による需要の減少などから生産量は低下,1973年閉山した。
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