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Researchers say they found accumulations of heavy metals along 60 miles of riverbanks in Colorado and New Mexico after the Gold King Mine spill.
David Weindorf of Texas Tech University and Kevin Lombard of New Mexico State University say they found discolored sludge containing elevated levels of iron, copper, zinc, arsenic and lead along the Animas River.
Weindorf says the concentrations of metals in the sludge were higher than at other sites on the banks and on nearby irrigated and non-irrigated land. About 3 million gallons of wastewater rushed out of the mine Aug. 5 after a cleanup crew supervised by the Environmental Protection Agency inadvertently breached a debris dam.
