Latitude: 39°56'N
Longitude: 140°56'E
A large iron and sulfur mine formed by impregnation and replacement in Pleistocene andesite and tuff strata. Four ore beds, the largest measuring 1 km x 800m x 80m, dipping 10%. The major ore mineral was marcasite! In the 1950s this was the 3rd largest mine in Japan in terms of gross tonnage of ore moved: 702,000 tons in 1958, including 469,000 tons FeS2 and 200,000 t of sulfur. The ore was burned to produce SO2 for sulfuric acid production and the clinker was used as iron ore.
References
Takeo Kato, Takeo Watanabe, Akira Nakamoto (1934) on the sulphur deposits associated with iron sulphide ore, found in the Quaternary Formation of Japan. Japan Journal of Geology and Geography, 15, 3-4, 287-324.
Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan
Mineral List
13 entries listed. 11 valid minerals.
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