CompaÃ±Ãa de Minas Buenaventura S.A.A., a precious metals company, engages in the exploration, mining, concentration, smelting, and marketing of polymetallic ores and metals in Peru, the United States, Europe, and Asia. It explores for gold, silver, lead, zinc, and copper metals. The company operates four operating mining units, including Uchucchacua, Orcopampa, Julcani, and Tambomayo in Peru; and San Gabriel, a mining unit under development stage. It also owns interests in Colquijirca, La Zanja, Yanacocha, Cerro Verde, El Brocal, Coimolache, Yumpaq, and San Gregorio mines, as well as Trapiche, a mining unit at the development stage. In addition, the company produces manganese sulphate, which is used in agriculture and mining industries. Further, it provides energy generation and transmission services through hydroelectric power plants; chemical processing services; insurance brokerage services; and industrial activities. The company was founded in 1953 and is based in Lima, Peru.