U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

SIXTH FIVE-YEAR REVIEW REPORT FOR IRON MOUNTAIN MINE SUPERFUND SITE, SHASTA COUNTY, CALIFORNIA
U.S. EPA Region 9, 107 pp, 2018

From the 1860s through 1963, the 4,400-acre Iron Mountain Mine site was mined for iron, silver, gold, copper, zinc, and pyrite. Though mining operations were discontinued in 1963, underground mine workings, waste rock dumps, piles of mine tailings, and an open mine pit still remain at the site. Exposure of the mine workings, waste rock piles, and the open pit mine to oxygen and water have produced acid mine drainage management issues. The Richmond Mine of the Iron Mountain copper deposit contains some of the most acid mine waters ever reported. Values of pH have been measured as low as -3.6, combined metal concentrations as high as 200 g/L, and sulfate concentrations as high as 760 g/L. The installation and operation of a full-scale neutralization system, the capping of areas of the mine, and the construction and operation of the Slickrock Creek Retention Reservoir to collect contaminated runoff for treatment have significantly reduced acid and metal contamination in surface water at the site. https://semspub.epa.gov/work/09/100010569.pdf



The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at adam.michael@epa.gov or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.