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Kisan-mori Mine

Kyowa-Funaoka, Daisen city, Akita pref., Japan

Synonym

Kisamori Mine

Occurrence

Moderate-T hydrothermal deposit

Moderate temperature hydrothermal deposit in the early Miocene (23 Ma) Kitanomata Formation and lower Hikarizawa Formation. The deposit was formed by the volcanic activity of the middle Miocene (15 Ma) Nakanomatayama dacite member of the middle Hikarizawa Formation. The Kitanomata Formation is composed of andesite, andesitic pyroclastics, and welded tuff deposited under shallow sea environment, and unconformably overlies the basement, the Late Cretaceous (100 Ma) Taiheizan plutonic-metamorphic complex. The Hikarizawa Formation conformably overlies the Kitanomata Formation, and the lower part is composed of alternating beds of sandstone and mudstone. There are Kuroko Massive Sulfide deposits such as Babame mine in the Nakanomatayama dacite member of the Hikarizawa Formation. Ages of sedimetary rocks were determined by microfossils, and plutonic rocks by K-Ar radiometric dating of biotite.

A scientific report in 1901 by Yaichiro Wakabayashi, mining engineer of this mine, suggests that the name of this mine is Kisan-mori, not Kisamori.

Reported Minerals

Mineral Assemblages

  • Quartz(Gangue) - Chalcopyrite - Galena
  • Malachite - Azurite
  • Brochantite - Linarite
  • Chrysocolla - Leadhillite
  • Pyromorphite - Tsumebite
  • Pyromorphite - Hinsdalite - Osarizawaite
  • Pyromorphite - Hinsdalite - Beaverite
  • Formed in the following order: Phosphate(Pyromorphite) - Phosphate+Sulfate(Hinsdalite) - Sulfate(Osarizawaite+Beaverite)
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