A lead-zinc-indium-silver mine featuring the Izumo, Soya and Sorachi veins. Located 30 km SW of Sapporo, close to an active hydrothermal system (some tunnels reached temperatures of 100 C). This was until recently the world's largest indium producer (30t/yr), but closed when ore reserves were exhausted in June 2006.
References:
- Encyclopedia of Minerals, 2nd. edition: 842
- Min. Jour. (Japan): 15: 222-232.
- Kozan Chishitsu (1989), 39, 107-22.
- Masuta, Kenzo; Kamiki, Takashi; Narui, Eiichi (1996): Polymetallic mineralization at the Toyoha south district, Hokkaido, Japan. Shigen Chishitsu 46, 45-61.
- Ishihara, Shunso (2005): An attractive mineral resource: indium from the Toyoha Mine. Chishitsu Nyusu 605, 46-54 (in Japanese).
Mineral List:48 entries listed. 42 valid minerals. 1 type locality (valid mineral).
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