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Yanahara mine, Okayama Prefecture, Chugoku Region, Honshu Island, Japan

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Ref: Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)

In the late 1950s this was the largest pyrite mine in the world. Ore consisted overwhelmingly of massive compact pyrite, with minor localized chalcopyrite, pyrrhotite and magnetite at the intrusive contacts. Mined principally for the pyrite (for sulphuric acid production), with minor byproduct copper, cobalt, and a special iron oxide (for magnetic audio tape). (1958 production: 626,594 tons ore, yielding 278,036 tons sulphur and 282 tons Cu.) Had closed by 1970.

The pyrite formed an irregular massive deposit emplaced concordantly in late Paleozoic sandstone and clayslate, intruded by younger quartz dioritic and granitic porphyry. Some of the slate has been altered to an unusual cordierite-anthophyllite rock at contact with the orebody.





Mineral List:
  		•  Actinolite
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Anthophyllite
    ☐[Mg
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  'Apatite'
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    Reference: [Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]
  		•  Biotite
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Bismuth
    Bi
    Reference: [Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]
  		•  Bismuthinite
    Bi
     
    2
    		S
     
    3
    Reference: [Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]
  		•  Calcite
    CaCO
     
    3
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)]
  		•  'Chlorite Group'
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Cordierite
    (Mg,Fe)
     
    2
    		Al
     
    4
    		Si
     
    5
    		O
     
    18
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.; Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]
  		•  Leucoxene
    Reference: [Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)]
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  'Pinite'
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Pyrite
    FeS
     
    2
    Reference: [Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)]
  		•  Pyrrhotite
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Reference: [Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)]
  		•  Quartz
    SiO
     
    2
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Rucklidgeite
    (Bi,Pb)
     
    3
    		Te
     
    4
    Reference: [Kase et al (1993) Canadian Mineralogist, 31, 99-104.]
  		•  Rutile
    TiO
     
    2
    Reference: [Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]
  		•  'Sericite'
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Reference: [Kano, H. (1963) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 3, #3, 1-17.]
  		•  'Tourmaline'
    AD
     
    3
    		G
     
    6
    		(BO
     
    3
    		)
     
    3
    		[T
     
    6
    		O
     
    18
    		]Y
     
    3
    		Z
    Reference: [Kato, T. (1922) Japanese Journal of Geology and Geography, 1, #3-4, 77-116.]


    26 entries listed. 19 valid minerals.

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