
The stones of Oya Stone Mining was already popular in year 741.
The stone tower of Kokubunji Temple was built by Oya Stone. In year 810, Oya Kannon was created on the cliff of the Oya Stone. In Showa period, it produced over 800,000 tons of stones per year. There are over 30 stone mining are still digging around the Oya, and the Oya Stone Mining is now for open as the park and event hole.