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.