Toya Mine
Hayatsuki, Toyako city, Abuta county, Iburi branch, Hokkaido, Japan
Synonym
Takarada Mine
Occurrence
Kuroko massive sulfide deposit
Kuroko Massive Sulfide deposit in ryolitic-dacitic tuff breccia in the upper part of the early Miocene (17 Ma) Osarugawa Formation. The Osarugawa Formation is continental to marine sediments, and overlies unconformably Mesozoic sediments and Paleogene granitic rocks. Tuff breccia, the host of the deposit, has been subjected to smectitization alteration. The maximum size of the Massive Sulfide deposit was 50 m x 20 m x 0.5 m. There are many gypsum deposits associated with mudstone beds. Kaolinite in the alteration zone was also mined.
A damp of Toya mine. The damp looks white because of gangue minerals such as gypsum and baryte. The damp at upper left is composed of gypsum only and looks snow white.
Reported Minerals
- Chalcopyrite
- Pyrite
- Galena
- Sphalerite
- Tetrahedrite
- Pyragyrite
- Stephanite
- Uchucchacuaite
- Andorite
- Bournonite
- Geocronite
- Diaphorite
- Benavidesite
- Zinkenite
- Stibnite
- Getchellite
- Chabournéite(Chabourneite)
- Orpiment
- Fizélyite(Fizelyite)
- Heteromorphite
- Enargite
- Robinsonite
- Baryte
- Gypsum
- Alunite
Mineral Assemblages
- Gypsum
- Chalcopyrite - Pyrite - Sphalerite - Galena - Tetrahedrite
- Baryte - Uchucchacuaite - Andorite - Bournonite
- Baryte - Uchucchacuaite - Geocronite - Diaphorite
- Baryte - Benavidesite - Zinkenite - Stibnite
- Baryte - Getchellite - Chabournéite(Chabourneite) - Orpiment
- Baryte - Fizélyite(Fizelyite) - Heteromorphite - Enargite
- Baryte - Robinsonite
- Alunite
History
- 1934-1942: Massive Sulfide deposit was mined. (Toya Mine)
- 1947-1954: 7,000 ton Kaolinite ore was mine. (Takarada Mine).
Localities
- Kosaka Mine (Tertiary,Sulfide)
- Hanawa Mine (Tertiary,Sulfide)
- Hanaoka Mine (Tertiary,Sulfide)
- Toya Mine (Tertiary,Sulfide)
- Takara Mine (Funnel structure,Sulfide)
- Asahi Mine (Tertiary,Gypsum)