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Takane Mine

Hirukawa, Nakatsugawa city, Gifu pref., Japan


Pneumatolytic deposit

Pneumatolytic deposit near the boundary between the Late Cretaceous (75 Ma) Nohi Rhyolite and the Late Cretaceous (70 Ma) Naegi-Agematsu Granite intruded in it. The Nohi Rhyolite is composed of ryolitic to dacitic welded tuff, and considered as the pyroclastic flow from the Cretaceous Ena Caldera. The Naegi-Agematsu Granite is S-type (Ilmenite-series), and considered as plutonic rock related to the Ena Caldera. Ages of igneous rocks were determined by the fission track dating of zircon.

Takane Mine

Dump of an old mine. White boulders are biotite granite of the Naegi-Agematsu Granite, the host of the deposit.

Reported Minerals

Mineral Assemblages

  • Quartz - Bismuth - Bismutite - Zavaritskite
  • Quartz - Wolframite
  • Quartz - Muscovite - Fluorite
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