Grupo Mexico is a transnational mining company with operations in the U.S., Mexico and Peru. ASARCO (American Smelting and Re ... fining Company), the U.S. based subsidiary of Grupo Mexico, is an integrated copper mining, smelting and refining company with approximately 1,700 employees. The company operates three mines, associated mills and smelter in Arizona and a refinery complex in Texas, which includes plants that produce copper cathode & rod. read more