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After 2 years (1674), Abe Kodaira, an engineer (an expert on mine development), takes development on track and Oyorizawa grows into a powerful copper mine. Oyosezawa after this is to mark the history of the rise and fall for over 200 years until Meiji Restoration, as a prestige by a mountain teacher or a merchant, or as Mateyama directly managed.
Shosh 府 5 (1715) The Shogunate orders Morioka Sakai to deliver 650,000 pots of Nagasaki-use copper (390 tons) from the copper mines of Shikakon (three mountains of Shirane, Oyorizawa and Tateishi). Nagasaki Sankushi Copper is copper used for trade settlement with China and the Netherlands, and Osaka Sabukiya (smelter) collected copper collected from copper mines across the country. As 650,000 tons a year were severe allocations for the Oyorizawa Mine and the purchase price was a low price far below the actual cost of production, the mine management put pressure on finance and the people who work there also had severe conditions. It was a good thing to do. At Morioka Nishiki, we manage the unstable Oyorizawa Copper Mine in Meiwa 2 (1765).
Even under such adverse conditions, the production amount gradually improved, and at the end of the Bakumatsu, it was now to divide the national copper production along with Iyo (Ehime Prefecture) Bezi and Akita Ani. The output of the copper era is estimated to be about 57 million pots (342 tons) annually with about 61 million pots (36,600 tons).