Sumitomo Metal Mining Co., Ltd., together with its subsidiaries, engages in mining, smelting, refining, and other businesses in Japan and internationally. It operates through three segments: Mineral Resources, Smelting & Refining, and Materials. The Mineral Resources segment engages in the exploration, development, production, and sale of non-ferrous metal resources, such as gold, silver, copper concentrates, and copper. The Smelting & Refining segment primarily engages in smelting and selling copper, electrolytic nickel, ferronickel, and zinc, as well as precious metals, including gold, silver, and platinum; and chemical products. The Materials segment is involved in the manufacture, processing, and sale of semiconductor materials comprising tape materials, as well as advanced materials that include pastes, powder materials, battery materials, and crystalline materials; and manufacture and sale of automotive exhaust processing catalysts, chemical catalysts, and petroleum refinery and desulfurization catalysts, as well as autoclaved lightweight concrete products. It also provides thick film materials, crystal materials, thin film materials, magnetic materials, package materials, oil refining catalysts, and lubricants. The company also engages in real estate and technical engineering businesses. The company was formerly known as Seika Kogyo (Mining) Co., Ltd. and changed its name to Sumitomo Metal Mining Co., Ltd. in June 1952. Sumitomo Metal Mining Co., Ltd. was founded in 1590 and is headquartered in Tokyo, Japan.