Hikida Mine
Hikida, Kanuma city, Tochigi pref., Japan
Occurrence
Moderately high-T hydrothermal deposit
Moderate temperature hydrothermal deposit probably associated with the early Paleocene (65 Ma) welded tuff of the Okunikko Rhyolites. The Okunikko Rhyolites unconformably overlies the Late Jurassic (145 Ma) Kurohone-Kiryu Unit. The Kaolinite-Siderite ore in the deposit suggests that the deposit was formed from neutral to alkaline fluid. The Kurohone-Kiryu Unit corresponds to the Kanayama Unit of the Tamba-Mino-Ashio accretionary complex. Ages of sedimentary rocks were determined by radiolarians, and welded tuff by K-Ar radiometric dating.
Reported Minerals
- Sphalerite
- Galena
- Pyrite
- Chrysocolla
- Siderite
- Kaolinite
Mineral Assemblages
- Quartz(Gangue) - Galena - Sphalerite - Pyrite
- Quartz(Gangue) - Kaolinite - Siderite
Details of the mine
Two major deposits, main deposit and Iwahana deposit, were mined.
History
- 1938: Started to mine.
- 1945: The mine was closed.
Localities
- Hikida Mine (Cu-Pb-Zn, Siderite)
- Okorogawa Mine (Cu)
- Shizuki Mine (Cu, Marine oxidation)