Located in Tucson, Arizona, ASARCO was organized in 1899 as American Smelting and Refining Company. They are one of the world's leading producers of copper, with mines, smelters and refineries located throughout the USA. The company also purchases concentrates containing silver and gold from other mining companies and has the capacity to produce more than 600,000 troy ounces of gold and over 60 million troy ounces of silver per year.