The Pacific War Online Encyclopedia
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Ashio (139.453E 36.649N) was a rich porphyritic copper deposit (23,000 tons per year) in the central mountains of Honshu. The veins of ore were first discovered in 1610, and the Ashio mine played an important role in Japan’s modernization. However, environmental damage from acid mine discharge led to riots in 1907, and the area is still badly polluted today.
Van Royen and Bowles (1952)
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