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

Photo: 2008, JGW
Latitude: 41°40'0"N
Longitude: 140°3'10"E
 
 
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

Acanthite
Actinolite
'Andradite-Grossular Series'
Ankerite
Annabergite
Argyrodite
Arsenopyrite
Calcite
var: Manganoan Calcite
Chalcopyrite
'Chert'
'Chlorite Group'
Coronadite
Cryptomelane
Diopside
Dolomite
Epidote
Ferrohexahydrite
Freibergite
Galena
'Garnet'
Geocronite
Gersdorffite
Goethite
Gold
Goslarite
Gypsum
Hexahydrite
Ilesite
Jôkokuite (TL)
Kaolinite
Kutnohorite
Lepidocrocite
Lithiophorite
Mallardite
Manganite
Marcasite
Matildite
Melanterite
'Mica Group'
Millerite
Muscovite
var: Sericite

Nickeline
Nsutite
Pararammelsbergite
Pentlandite
Plumbogummite
Polybasite
Prehnite
Proustite
Pyrargyrite
Pyrite
var: Bravoite
Pyrolusite
Pyrrhotite
Quartz
Rhodochrosite
Rozenite
Siderotil
Silver
Sphalerite
Stephanite ?
Szmikite
Szomolnokite
Talnakhite ?
Tetrahedrite
var: Argentian Tetrahedrite

Tremolite
Violarite
'Wad'
Wollastonite
Zincmelanterite
Zoisite


72 entries listed. 62 valid minerals. 1 type locality (valid mineral).

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References

- 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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