Gold King Mine
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| Date | August 5, 2015 |
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| Location | Gold King Mine Silverton, Colorado, United States |
| Coordinates | 37°53′40″N 107°38′18″W / 37.89444°N 107.63833°WCoordinates: 37°53′40″N 107°38′18″W / 37.89444°N 107.63833°W |
| Cause | Accidental waste water release, approx. 3 million US gal (11 ML) |
| Participants | Environmental Protection Agency |
| Outcome | River closures (until about Aug 17 with ongoing tests) Ongoing water supply & irrigation issues |
| Waterways affected | Animas and San Juan rivers |
| States affected | Colorado, New Mexico, Utah |
| Website | EPA updates |
The 2015 Gold King Mine waste water spill was an environmental disaster that began at the Gold King Mine near Silverton, Colorado, when EPA personnel, along with workers for Environmental Restoration LLC (a Missouri company under EPA contract to mitigate pollutants from the closed mine), caused the release of toxic waste water into the Animas River watershed. They caused the accident while attempting to drain ponded water near the entrance of the mine on August 5. The maintenance by the EPA was necessary because local jurisdictions had previously refused Superfund money to fully remediate the regions' derelict mines, due to a fear of lost tourism. After the spill, the Silverton Board of Trustees and the San Juan County Commission approved a joint resolution seeking Superfund money.
Contractors accidentally destroyed the plug holding water trapped inside the mine, which caused an overflow of the pond, spilling three million US gallons (11 ML) of mine waste water and tailings, including heavy metals such as cadmium and lead, and other toxic elements, such as arsenic,beryllium,zinc,iron and copper into Cement Creek, a tributary of the Animas River in Colorado. The EPA was criticized for not warning Colorado and New Mexico about the operation until the day after the waste water spilled, despite the fact the EPA employee "in charge of Gold King Mine knew of blowout risk."
The EPA has taken responsibility for the incident, but refused to pay for any damages claims filed after the accident on grounds of sovereign immunity, pending special authorization from Congress or re-filing of lawsuits in federal court. Governor of Colorado John Hickenlooper declared the affected area a disaster zone. The spill affects waterways of municipalities in the states of Colorado, New Mexico, and Utah, as well as the Navajo Nation. As of August 11, acidic water continued to spill at a rate of 500–700 US gal/min (1.9–2.6 m3/min) while remediation efforts were underway.
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