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The Hachinohe mine (八戸鉱山, Hachinohe Kōzan) is an open-pit mine in Hachinohe, Aomori Prefecture, Japan. It is mined for limestone and currently operated by the Sumimetal Mining Company.
The mine is the lowest point in Japan at 170 meters below sea level, and digging still continues. It is known locally as the "Hachinohe Canyon."
References
Hachinohe mine Wikipedia(Text) CC BY-SA