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Taiheiyo Coal Mining Co.,Ltd. Kushiro Colliery (Taiheiyo Coal Mine) is Located on the southeastern part of Kushirocity in Hokkaido prefecture, Japan. Taiheiyo Coal Mine, which is an underground coal mine, was established in 1920. The total output of clean coal during its 80 years of operation was more than 100 million tons. Its mining fields gradually expanded into sea beds in the Pacific