TrekGEO > Mineral Trail > Kanto region > Ibaraki pref. > Hidaka Mine

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Hidaka Mine

Iwamoto, Ogitsu village, Hitachi city, Ibaraki pref., Japan

This mine is seemed to be under the dam lake.

Occurrence

Besshi massive sulfide deposit

Besshi Massive Sulfide Deposit in Greenschist of the Cambrian Series 3 (500 Ma) Daioin Formation subjected to Greenschist facies metamorphism in the Late Cretaceous (100 Ma) Abukuma metamorphic belt. Metamorphic grade is near the boundary between Greenschist facies and Epidote-Amphibolite facies. Age of sedimentary rock was determined by coral fossil, and metamorphic age by K-Ar radiometric dating of muscovite.

Hidaka Mine

Outcrop of oxidation zone near a bedded Cu-Fe deposit in the Daioin Formation. The origin of brown color of the outcrop is limonite which was formed by oxidation of iron sulfide minerals in the deposit. Oxidation zones are sign for searching deposits near by. This outcrop is composed of greenschist, and its original fresh color is observed as grayish green at approximately 30 meter apart from this outcrop.

Reported Minerals

  • Chalcopyrite
  • Pyrite
  • Malachite
  • Chrysocolla

Mineral Assemblages

  • Pyrite - Chalcopyrite - Quartz

History

  • around 1600: Satake feudal domain found the deposit.
  • 1904: Began to mine copper.
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