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Kyurazawa Mine

Ashio village, Nikko city, Tochigi pref., Japan

Occurrence

Albite-Epidote-hornfels facies bedded Manganese deposit

Chert-hosted bedded manganese deposit in Permian - Jurassic chert blocks of Middle Jurassic Omama Complex. The deposit has been subjected to Albite-Epidote-hornfels facies contact metamorphism by Sori Granodiorite and Kobugahara Granodiorite. Approximately 2 km apart from Kobugahara Granodiorite, 3 km from Sori Granodiorite.

Kyurazawa Mine

The entrance of the lowest level adit of Shin-sanjin ore body of Kyurazawa mine. The adit is on the outcrop of bedded chert of Omama Complex.

Reported Minerals

Mineral Assemblages

  • Rhodonite - Manganpyrosmalite - Calcite
  • Rhodonite - Manganocummingtonite
  • Quartz - Spessartine

Produced metal

  • year 1949: Concentrate 860 t (Mn 40 %)
  • year 1950: Concentrate 790 t (Mn 40 %)
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