The 3000-acre Stibnite/Yellow Pine Mining Area site is located along the East Fork of the South Fork of the Salmon River (EFSFSR), 14 miles southeast of the town of Yellow Pine in Valley County, Idaho, in the Payette National Forest. Mining operations took place on site from the early 1900s until the late 1990s. The mine was a major producer of antimony and gold. Mining-related source areas of potential contaminants include the Bradley tailings (main deposition area), smelter process area and wastes, process ponds, five heap-leach pads, and an open-pit mine. Past mining activities have deposited metals, spent and neutralized ore, waste rock, and mine tailings over half of the site. Contaminants associated with mining operations include heavy metals and cyanide in area soil, groundwater, seeps and sediments. The Idaho Department of Environmental Quality (IDEQ) is addressing cleanup and site operation and maintenance activities.