Koryu mine (Kohryu mine), Ishikari Province, Hokkaido, Japan
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Abandoned gold-silver mine.
Epithermal gold-silver quartz vein deposit in an east-west shear zone within Miocene black mudstone.
A first mineralisation stage is characterized by manganocalcite, johannsenite and small amounts of ore minerals, whereas later stages are characterized by large amounts of ore minerals.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
25 valid minerals.
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T. Shimizu, H. Matsueda, D. Ishiyama & O. Matsubaya (1998): Genesis of epithermal Au-Ag mineralization of the Koryu mine, Hokkaido, Japan. Economic Geology, 93, 303-325.
Kitakaze, A., Itoh, H., Komatsu, R., & Higuchi, Y. (2012). Baumstarkite from the Koryu Mine, Hokkaido, Japan. The Canadian Mineralogist, 50(1), 101-109.
Shimizu, T. Evolution of subaerial magmatic-hydrothermal systems: A comparative study between Koryu Au-Ag deposit and Toyoha polymetallic deposit at Sapporo-Iwanai district, Hokkaido, Japan. AUSIMM