From the Engineering and Mining Journal:
This week, the U.S. Environmental Protection Agency (EPA) added three mining-related sites to the National Priorities List (NPL) of Superfund sites. These include the Bonita Peak Mining District (BPMD) site in San Juan County, Colorado; the Argonaut mine, Amador County, California; and the Anaconda Aluminum Co.’s Columbia Falls Reduction Plant site, also known as the Columbia Falls Aluminum Co. (CFAC) site, in Columbia Falls, Montana.
The law establishing the Superfund program, the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), requires the EPA to update the NPL at least annually and clean up hazardous waste sites. The designation comes a little more than a year after the EPA released 3 million gallons of water from the Gold King mine into the Animas River fouling rivers and lakes from Colorado to Nevada. The Gold King mine is one of several abandoned mines in the Bonita Peak district…
The lawsuits stemming from this mishap are just now coming to a head. The state of New Mexico, however, is suing the state of Colorado, claiming it approved the plans that led to this situation.
The Bonita Peak Mining District site consists of historic and ongoing releases from mining operations in three drainages, which converge into the Animas River near Silverton, Colorado. Water quality in the BPMD has been impaired by acid mine drainage for decades. Since 1998, the state of Colorado has designated portions of the Animas River downstream from Cement Creek as impaired for heavy metals, including lead, iron and aluminum. The EPA has waste quantity data on 32 of Bonita Peak’s 48 sources. These 32 sources have waste rock and water discharging out of adits at a combined rate of 5.4 million gallons per day. Cadmium, copper, manganese and zinc are the known contaminants associated with these discharges.