Korea Zinc Company, Ltd. is a non-ferrous metal smelter headquartered in Seoul, South Korea. It is one of the leading refined zinc-producing companies alongside Nyrstar, Hindustan Zinc, and Boliden. Korea Zinc produces 18 types of valuable metals and chemical products by processing various raw materials from zinc and lead concentrates to low-grade ore and scrap metal. Korea Zinc was founded by Choi Ki-ho and Chang Byung-hee in 1974. Since its establishment, Korea Zinc has been co-managed by the Choi and Chang families. Wikipedia