Mining is the main source of revenue for Cananea and will be for the foreseeable future. Eighty percent of the population is directly or indirectly supported by mining companies in Cananea. The first and most important mining company is Buenavista del Cobre, S.A. de C.V. (formerly Mexicana de Cananea, S.A. de C.V.) owned by the Southern Copper Corporation, and still shares ownership with Grupo Mexico, S.A.B. de C.V. Grupo Mexico plans to invest $3.7 Billion US Dollars at the Cananea Mine. This program is expected to increase Buenavista's production capacity from 180,000 tons of copper per year to over 450,000 tons. During 2Q11, Buenavista reached its full capacity and produced 45,588 tons of copper: 15,170 tons of copper cathode at its SX/EW Plant and 30,417 tons of copper concentrate at the Concentrator Plant.