A 29-acre disposal cell created by the DOE in 1995 to contain the contaminated tailings and mill buildings from a uranium mill in Gunnison, Colorado, six miles away, which was cleaned up as part of the federal Uranium Mill Tailings Remedial Action Project. The mound is 1,200 feet long, 50 feet high, and contains 740,000 cubic yards of contaminated material. It is next to a landfill.