Mexico's largest mining company, Grupo México is the world's #3 copper producer, behind Chile's Codelco and Freeport-McMoRan Copper & Gold of the US. The company's mining segment (83% of sales in 2011) has operations in Mexico (Minera México), the US (ASARCO), and Peru (81%-owned Southern Copper). It mines and refines copper, silver, zinc, molybdenum, lead, and other metals, as well as coal, and produces intermediate copper products (cathodes and rods) and sulfuric acid. The company's Ferroviario Mexicano (Ferromex) rail transport division operates Mexico's largest rail fleet with 12,400 railcars, 590 locomotives, and 6,000 miles of track. México Compania Constructora engages in infrastructure development.