Stone from the Oya Stone Mine was already popular in the year 741. The stone tower of the Kokubunji Temple was built using Oya Stone. In the year 810, the Oya Kannon statue was created on the side of a cliff using Oya Stone. In the Showa period (1926-1989), the mine produced over 800,000 tons of stone per year. There are more than thirty stone mines still is use in the Oya area, and the Oya Stone Mine is now for open as a park and venue for events.
official homepage: http://www.oya909.co.jp/