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The huge amount of water nearly flooded Cement Creek as it flowed into the Animus River, after breaking free from a shoddy dam at the Gold King Mine. EPA officials said that a blockage of loose soil and little more was holding in the bright orange wastewater at Gold King, a former gold mine, when water broke loose. An EPA official estimated that 200 gallons of wastewater per minute was still flowing out of the mine as of Friday afternoon.
The EPA was working at the property as part of a plan to remediate the superfund site and stop a longtime flow of acidic, heavy metal-laden wastewater from the nearby Red and Bonita mine, all near the abandoned Gladstone mining town. The work would have installed a bulkhead, or massive plug, at the end of the inactive mining tunnel.
The EPA’s initial tests of the wastewater and sediment in Animus found substances known to be harmful to be human health, including lead, arsenic, cadmium, copper, calcium and other heavy metals “at varying levels,” though at concentrations enough for officials to warn people away from the river. The PH of the water near the mouth of the mine was found to be 4.5, roughly that of beer. Lake water typically ranges from 6.5 to 8.5 on the PH scale.
EPA officials later told reporters that the impact on human and environmental health was not immediately clear, because toxicologists are still analyzing data from water samples.
“First off, I’d like to just say I’m sorry for what’s happened,” David Ostrander, the EPA’s head of emergency management told a standing-room-only crowd in Durango, Colorado Friday afternoon. “This is a huge tragedy, and it’s hard being on the other side of this, in terms of being the one who caused this incident.”
“We usually respond to emergencies, we don’t cause them,” said Ostrander.
The wastewater is the vestige of gold rush mining of more than 100 years ago. Though the mine still has an owner it appears to have been all but abandoned.
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