Superfund Site Profile
The 10-acre Standard Mine site is located in the Ruby Mining District of the Gunnison National Forest in Gunnison County, Colorado. Silver mining began in the southern Ruby Mining District in 1874, and continued up to 1974 at several mine sites. Mineralized waste rock exposed to air and water causes acidic conditions. These acidic conditions mobilize the release of heavy metals to the surrounding environment. These heavy metals are being deposited into Elk Creek, which flows into Coal Creek and eventually to downstream water users. Mining activities at the site have contaminated soil, surface water and groundwater with heavy metals. Design of the site’s remedy is underway.