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Iron Mountain Mine, also known as the Richmond Mine at Iron Mountain, is a mine near Redding in Northern California. Geologically classified as a massive sulfide ore deposit, the site was mined for iron, silver, gold, copper, zinc,and pyrite intermittently from the 1860s until 1963. The mine is the source of extremely acidic mine drainage which also contains large amounts of zinc copper and cadmium. One of America's most toxic waste sites, it has been listed as a Federal Superfund site since 1983.