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

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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

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