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Tsuchidaru Mine

Tsuchidaru, Yuzawa city, Minami-Uonuma county, Niigata pref., Japan

Occurrence

Serpentinite skarn deposit

Serpentinite-hosted pneumatolytic-skarn deposit formed by the Miocene quartz porphyry and rhyolite dyke intruded in Miocene Matsukawa Formation and Tanigawadake body, a serpentinite block of Joetsu Belt. The quartz porphyry and rhyolite dykes are associated with Tanigawa Body, a Miocene quartz diorite, by which the deposit has been subjected to contact metamorphism. Approximately 2km apart from the quartz diorite dike, and less than 1 km apart from Tanigawa Body. Carbonate-mineral veins formed by oxidation of the serpentinite corresponds to limestone of skarn.

Reported Minerals

  • Mimetite
  • Cerussite
  • Cuprite
  • Tremolite
  • Actinolite
  • Axinite-(Fe)
  • Clinozoisite
  • Magnetite
  • Pyrite
  • Sphalerite
  • Galena
  • Garnierite
  • Serpentine

Mineral Assemblages

  • Actinolite - Mimetite
  • Quartz - Tremolite - Clinozoisite
  • Quartz - Axinite-(Fe)
  • Serpentine - Magnetite

History

  • 1868: The deposit was discovered.
  • 1926: Arsenic ore was mine.
  • 1943: Produced 300 t ore of Cu and As.
  • Temporarily restarted after the World War II.
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