Komaki Mine
Yokota, Oku-Izumo city, Nita county, Shimane pref., Japan
Occurrence
Pneumatolytic deposit formed in the early Paleocene (65 Ma) Komaki Granite. The Komaki Granite is intruded in the Carboniferous to Permian (350-270 Ma) limestone of the Akiyoshi Limestone Group, a member of the Akiyoshi accretionary complex. The Komaki Granite is I-type (Magnetite-series). The Akiyoshi Limestone Group is considered as the Carboniferous to Permian reef limetone, reef on the summit of the seamount in the Panthalassa (Panthalassic Ocean). Ages of limestone was determined by microfossils and coral fossils, granite by Rb-Sr whole rock isochron age and K-Ar radiometric dating of muscovite and biotite.
Reported Minerals
Mineral Assemblages
- Quartz(Gangue) - Molybdenite - Wolframite
- Quartz(Gangue) - Molybdenite - Ferrimolybdite
- Almandine - Chlorite - Quartz
History
- around 1900: The deposit was found during road construction.
- 1911: Began to mine.
Locality
- Takatori Mine (Ferberite)
- Ebisu Mine (Wolframite)
- Togane Mine (Wolframite)
- Komaki Mine (Wolframite)
- Itaga Mine (Andalusite)
- Otani Mine (Cassiterite, Scheelite)
- Taisho Mine (Cassiterite)
- Ichiyanagi Mine (Löllingite)
- Takane Mine (Bismuth)
- Karasawa Mine (Bismuth)
- Takemori (Dravite)