Yamanaka Mine
Yamanaka, Kami-Naguri, Hanno city, Saitama pref., Japan
Occurrence
Prehnite-Pumpellyite facies bedded manganese deposit
Chert-hosted bedded manganese deposit in a chert block of Sumaizuku unit, a member of accretionary complexes of Northern Chichibu Belt.
Outcrop of an oxidation zone near a manganese deposit. The thick black crust is manganese oxide ore, possibly composed of cryptomelane. The pale red host is chert of Sumaizuku unit.
Reported Minerals
- Manganite
- Manganese dioxide
Mineral Assemblages
- Manganese dioxide - Manganite
Details of the mine
This deposit was mined for a few years between 1955 to 1965.
Localities
- Okura Mine (Chichibu belt, Jurassic)
- Agano Mine (Chichibu belt, Jurassic)
- Kamado Mine (Chichibu belt, Jurassic)
- Naguri Mine (Chichibu belt, Jurassic)
- Yamanaka Mine (Chichibu belt, Jurassic)
- Masutomi Mine (Koma Group, Miocene)
- Ochiai Mine (Koma Group, Miocene)
- Tomisato Mine (Koma Group, Miocene)
- Inago Mine (Tanzawa Group, Miocene)
- Takamatsu Mine (Tanzawa Group, Miocene)
- Dainichi Mine (Tanzawa Group, Miocene)
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)