Pine Creek Tungsten Mine, California

Once the largest tungsten producer in the United States (over 2,000 tons per day), this mine on the slope of Mount Morgan, in the eastern Sierras, west of Bishop, has been in caretaker status since 1999, when milling operations ceased. Currently owned by Pine Creek Development LLC, who acquired it from Avocet Tungsten, who in turn purchased it from Union Carbide.