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Johkoku mine (Jôkoku mine; Jokoku mine), Kaminokuni, Hiyama Subprefecture, Oshima peninsula, Hokkaido, Japan

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Hydrothermal rhodochrosite veins mined for manganese and base metals. This was once the largest of Japan's numerous manganese mines; now closed. (1958 production: 105,652 tons crude rhodochrosite.) The Uwaban No. 5 vein also carried nickel minerals in a dolomite veinlet.

Mineral List

73 entries listed. 63 valid minerals. 1 type locality (valid mineral).

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- Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
- Hariya, Yu; Hasegawa, Kiyoshi (1979) Contact Metasomatic Zone and Massive Ore Body in Manganese Epithermal Deposits of the Jokoku Mine, Hokkaido, Japan. Jour. Fac. Sci., Hokkaido Univ., Ser. IV, vol. 19, nos. 1-2, March, 1979, pp. 265-272.

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