All-out remediation effort targets acid mine drainage near Keystone Ski Area
By Bob Berwyn
FRISCO — For decades, the abandoned Pennsylvania Mine has been oozing heavy metals — zinc, manganese, cadmium, lead and and arsenic — into the waters of Peru Creek, a small tributary of the Snake River near Keystone, Colorado. The site has been the focus of intensive study during the past 15 years with the goal of improving water quality downstream.
Last week, engineers and environmental experts took a big step toward trying to staunch that flow by blocking one of the mine tunnels. If all goes well, the new bulkhead could reduce the direct discharge from the mine by about two-thirds, said Jeff Graves, a remediation expert with the Colorado Division of Reclamation Mining and Safety.
Graves explained that the new plug should force the water back into its natural underground pathways, trickling and percolating down through layers of rock and earth, and not as prone to the oxidation that’s key in the formation of acid mine drainage. Essentially, the work will restore the groundwater flow to more natural, pre-mining conditions, he said. Continue reading
Filed under: Environment, rivers, water, water quality | Tagged: abandoned mine pollution, acid mine drainage, EPA, Pennsylvania Mine, Peru Creek, Snake River Colorado, Snake River watershed task force | Leave a comment »