Oya Stone Mine In Tochigi
The History of Oya Stone Mine. Historical records show that some 1,500 years ago, Oya-ishi - the type of stone that is specific to the Oya area in Tochigi - was mined for use in building burial chambers. Full-scale mining operations began some 80 years ago which eventually resulted in the excavation of over 300,000 cubic meters of …