Abstract
Dowa Mining commenced its activity in 1884 with mining Kuroko and have endeavoured to fully utilize underground resources. At first, only silver and small amounts of gold and copper were recovered from Kuroko. With epochmaking research and dovelopment, Dowa Mining succeeded in recovering valuable elements to the greatest extent possible from Kuroko. A large scale of pyritic smelting of Kuroko lump ore was the first epochmaking development. Success separating Kuroko into each concentrate was the next one. The mineral processing technology improved year by year and was accelerated by the development of the ‘hot water flotation’ technology. Smelting processes have changed corresponding with the improvements in the mineral processing results. A Kosaka smelter complex was established to effectively recover valuable metals in other concentrates. A comprehensive network to recover valuable elements in underground resources is described.
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