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Amo Mine

Amo, Kawai village, Hida city, Gifu pref., Japan

Occurrence

Low-P granulite facies middle-P metamorphic rocks

Graphite deposit in gneiss of the Hida metamorphic belt subjected to Granulite facies metamorphism as a part of the medium-P Hida metamorphism in the Late Ordovician to Carboniferous (450-300 Ma). The Hida metamorphic belt was formed by the collision of the Yangtze Craton with the North China Craton. The Hida metamorphic rocks had been subjected to Epidote-Amphibolite facies metamorphism in the Middle Triassic (240 Ma), and has been subjected to Greenschist facies metamorphism by the Late Triassic (220 Ma) Funatsu Granitic Rocks. The Funatsu Granitic rocks are I-type (Magnetite-series). Metamorphic age was determined by K-Ar and Rb-Sr radiometric dating, and granitic rocks by Th-Pb and SHRIMP dating.

Reported Minerals

Mineral Assemblages

  • Quartz - Feldspar - Graphite

Produced metal (around 1951)

  • Graphite: 15 tons/month

History

  • 1892: The deposit was discovered by Mr. Yajima.
  • 1897: Started to mine 7-8 t/day ore.
  • 1916: The mine was closed..
  • 1921: Yonosuke Genda restarted to mine.
  • 1949: The concentrator was built.
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