Mitsui Mining & Smelting Co., Ltd. engages in the manufacture and sale of functional materials, electronic materials, and automotive parts. It operates through the following segments: Engineered Materials, Metals, Automotive Parts and Components, and Affiliates Coordination. The Engineered Materials segment offers battery materials, exhaust gas purification catalysts, functional powders, copper foil, and ceramic products. The Metals segment provides zinc, lead, copper, gold, and silver. It also deals with the resource recycling business. The Automotive Parts and Components segment handles the manufacture and sale of door locks for automobiles. The Affiliates Coordination segment covers die cast, powder metallurgy, copper, and pearlite products. The company was founded in September 1874 and is headquartered in Tokyo, Japan.