Hagidaira Mine
Konaka, Azuma village, Midori city, Gunma pref., Japan
Occurrence
Hornblende-hornfels facies bedded manganese deposit
Chert-hosted bedded manganese deposit in Permian - Jurassic chert block of Omama Complex, a member of Jurassic accretionary complex of Tamba-Mino-Ashio Belt. The deposit was subjected to Hornblende-hornfels facies contact metamorphism by Sori Granodiorite of Sori-type Granitic Rocks, and W, Te, Bi were supplied. Slate near this deposit was metamorphosed to Cordierite-bearing hornfels. Approximately 3 km apart from Sori Granodiorite, the heat source.
Reported Minerals
- Tephroite
- Alleghanyite
- Rhodochrosite
- Manganosite
- Alabandite
- Rhodonite
- Pyroxmangite
- Spessartine
- Pyrophanite
- Hübnerite
- Pyrite
- Pyrrhotite
- Chalcopyrite
- Galena
- Sphalerite
- Gersdorffite
- Cosalite
- Joséite(Joseite)
- Nickeline
- Bustamite
- Vivianite
- Opal
Mineral Assemblages
- Tephroite - Alleghanyite - Rhodochrosite - Manganosite - Alabandite
- Rhodonite - Pyroxmangite - Spessartine - Quartz
- Rhodonite - Spessartine - Pyrophanite - Hübnerite - Sphalerite
History
- 1895: Mr. Sakamoto, a village person, discovered the deposit and mined manganese oxide ore.
- 1951: Started to mine maganese ore.
Localities
- Oashi Mine (Helvite)
- Hagidaira Mine (W, Bi, Te)
- Takanosu Mine (Axinite-(Mn))
- Higashizawa Mine (Axinite-(Mn))
Related Occurrences
- Bedded Mn (Diagenesis)
- Bedded Mn (Low-T zeolite facies)
- Bedded Mn (High-T zeolite facies)
- Bedded Mn (Prehnite-Pumpellyite facies)
- Bedded Mn (Pumpellyite-Actinolite facies)
- Bedded Mn (Greenschist facies)
- Bedded Mn (Epidote-Amphibolite facies)
- Bedded Mn (Amphibolite facies)
- Bedded Mn (Albite-Epidote-hornfels facies)
- Bedded Mn (Hornblende-hornfels facies)
- Bedded Mn (Pyroxene-hornfels facies)
- Ocean-floor Mn Nodule
- Ocean-floor Mn Crust
- Bedded Mn (Meteoric supergene)
- Bedded Mn (Marine supergene)