AdvertisementMore Than A Year After Spill, Colorado's Gold King Mine Named Superfund SiteSeptember 08, 2016Christopher Dean HopkinsfacebookEmailWater flows through a series of sediment retention ponds in August 2015 that were built to contain heavy metal and chemical contaminants from the Gold King Mine wastewater accident in Colorado. That site, and 47 others in southwest Colorado, were declared Superfund sites on Wednesday. (AP)