Superfund Site Profile
The 360-acre Gilt Edge Mine site is located about 6.5 miles east of Lead, South Dakota. The primary mine disturbance area encompasses a former open pit and a cyanide heap-leach gold mine, as well as prior mine exploration activities from various companies. In the late 1990s, the most recent mine operator, Brohm Mining Company (BMC), left about 150 million gallons of acidic heavy-metal-laden water in three open pits and millions of cubic yards of acid-generating waste rock. Historical operations at the site contaminated surface water and leachate with hazardous chemicals. Investigation and cleanup activities at the site are ongoing. Interim remedies are currently in place for two of the site’s three areas.
TOPICS IN FOCUS
EPA has begun the third five-year review of the site. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. This review will be completed by June 2017.