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Koryu mine (Kohryu mine), Ishikari Province, Hokkaido, Japan

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Locality type:Mine

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 List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

25 valid minerals.

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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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

Mineral and/or Locality  
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