Sumitomo Metal Mining. 

Sumitomo Metal Mining Co., Ltd. (SMM), established in Tokyo, Japan, in 1590, stands as a global leader in the mining, smelting, and refining of non-ferrous metals. Operating internationally and domestically within Japan, the company—which adopted its current name in June 1952, having previously been known as Seika Kogyo (Mining) Co., Ltd.—structures its extensive operations across three principal divisions: Mineral Resources, Smelting & Refining, and Materials. SMM's core business involves producing a variety of metallic products, including copper, nickel/cobalt, gold/precious metals, and other mineral deposits. The company is also an innovator in advanced materials, offering battery components such as nickel hydroxides and lithium nickel-cobalt-aluminum oxides. Its crystal materials segment is responsible for products like lithium tantalates/niobates, optical isolators, and faraday rotators. The Materials division further develops a wide array of powder products, encompassing thick film pastes, nickel and fine copper powders, nickel oxides, near-infrared shielding and deep-tinting compounds, sputtering targets/tablets, electromagnetic sheets and coils, rare earth magnetic materials, and lubricants. Additionally, SMM manufactures package materials, including copper-clad polyimide films and printed wiring boards, alongside diverse catalysts for automotive, chemical, hydro processing (including rejuvenation and regeneration services), and petrochemical applications. Its product portfolio is rounded out by construction materials, terminals, connectors, and lens barrels. Beyond its robust manufacturing base, SMM provides a range of specialized services. These include water and precious metal recycling, environmental engineering and water treatment solutions, sterilization and material property modification through irradiation, and domestic marine transportation. The company also holds interests in real estate and offers expert technical engineering capabilities.