The Iron Mountain Mine is a former copper mine located in California's Shasta County. It is known for its significant environmental issues, particularly the contamination of nearby water sources due to acid mine drainage. The mine operated from the late 19th century until the 1960s, leaving behind a legacy of pollution that has affected local ecosystems. Efforts have been made to remediate the site, including the construction of treatment facilities to manage the toxic runoff. The mine is also a part of the Iron Mountain Superfund site, designated by the U.S. Environmental Protection Agency for cleanup due to its hazardous waste.