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Otome Mine

Yanagidaira, Makioka village, Yamanashi city, Yamanashi pref., Japan

"No Trespassing" sign was erected.


Otomezaka Mine, Kurasawa Mine


Titanium type rare-element pegmatite

High-temperature hydrothermal deposit at the bondary between granodiorite of the Kinbu body and granite of the Shosenkyo body of the middle Miocene (13 Ma) Shosenkyo Granite. Granodiorite of the Kinbu body was intruded by granite of the Shosenkyo body. The gangue of the deposit is large pegmatitic quartz veins of the late Miocene (9 Ma) intruded in granodiorite. The Shosenkyo Granite is I-type and Ilmenite-series. Ages of granite was determined by K-Ar radiometric dating of biotite and whole rock, deposit by K-Ar radiomtric dating of sericite. The type locality of reinite, ferberite pseudomorph after scheelite.

Otome Mine

Adit on a huge quartz vein in granodiorite. Side walls of this adit are white quartz. Wooden frames are in the adit. The cave at the right end of this photograph is a pocket.

Reported Minerals

  • Quartz
  • Anatase
  • Brookite
  • Rutile
  • Molybdenite
  • Galena
  • Pyromorphite
  • Tetradymite
  • Cosalite
  • Chalcopyrite
  • Pyrite
  • Ferberite
  • Scheelite
  • Tungstite

Mineral Assemblages

  • Quartz - Rutile
  • Quartz - Pyrite
  • Quartz - Molybdenite

Details of the mine

Clear quartz was mined.

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