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Department of Energy, Worker at the Schwartzwalder Uranium Mine, undated, Flickr
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Schwartzwalder Mine

Located in the Front Range of the Rocky Mountains just west of Denver, Colorado, the Schwartzwalder uranium deposit is the largest vein-type deposit in the United States. Uranium was discovered in the 1940s and the mine operated from 1953-1995, producing 99% of all uranium in the Front Range.

In 1984, the mine was declared a Superfund site due to contamination of nearby creeks and the Ralston Reservoir, which provides drinking water for 1.3 million Denver metro residents. While Schwartzwalder closed in 1995, its previous owner, Cotter Corporation, estimated 16 million pounds of uranium oxide remain in the mine and used a legal loophole that allowed it to remain open on "intermittent status" and therefore eligible for numerous cleanup exemptions.

The Schwartzwalder Mine has faced many environmental issues: the mine received almost 100 separate environmental violations from 2000 to 2010. Although a 2010 groundwater field test revealed uranium 1,000 times higher than state standards, the Colorado Department of Public Health and Environment (CDPHE) claimed that the water supplies for Denver, Arvada, and other Front Range communities are safe.

In March 2018 the mine was sold to Colorado Legacy Land, a partnership between Colorado Legacy Land Stewardship and Alexco Environmental Group. Part of the public benefit corporation's mission is to clean up contaminated properties and convert them into useable, eco-friendly spaces. On April 3, 2018, Alexco Water and Environment (like Alexco Environmental Group, a subsidiary of Alexco Resource Gorp.), became the Operator of Responsible Charge for the cleanup of the Schwartzwalder Mine.

Sources

Alexco Resource Corp. "Alexco Environmental Group and Colorado Legacy Land LLC Partner to Cleanup Legacy Uranium Mining and Processing Sites in Central Colorado." CISION PR Newswire. April 10, 2018. Accessed July 31, 2020.

Hudson Institute of Mineralogy. "Schwartzwalder Mine (Ralston Creek Mine)." Minedat.org. Accessed July 31, 2020.

Lewis, Hilary. "Schwaltzwalder Mine.​​​​​​​" Earthworks, May 1, 2017. Accessed January 13, 2023.


 

Last Updated:

01/13/2023

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