Underground Mine
Now a national historic site, this mill operated from 1913 to 1943, processing ore brought via the 22,000 foot Argo Tunnel. At the time it was built, it was the largest mill of its type in the world. It is now a tourist attraction.
This mine complex is among the largest in the state, employing over 1,600 people in 2000. Nearly 2 million ounces of gold is extracted here annually, valued at over $600 million. Its is one of three large mines in the state operated by the Newmont Mining Company, one of the pioneer mining companies...
The FMC mine is the largest trona mine in the world, with 2,000 miles of tunnels, most of which are 14 feet wide and 8 feet tall. It extracts as much as 900 tons an hour. It is one of several mines working the vast layer of trona that lies beneath the surface in the region. Trona is a soft, soda...
In 1994, this was the largest salt mine in North America, and the second largest in the world. 300 people worked within the 6,000 acres of excavated space, a thousand feet below ground, extracting salt from a natural deposit for use as road salt, table salt, and in industry. In March of1994,...
One of the largest copper smelters in the nation was located here until 2006, when it was torn down. It and the adjacent rod plant produced 325,000 tons of refined copper per year, for use in wires, cable, and rod. Australia's Broken Hill Proprietary Co. Ltd (BHP) took over operations of the mine,...