The Cleveland Mill Site is located in southwestern New Mexico, approximately 5.5 miles north of Silver City, at the headwaters of a small tributary of Little Walnut Creek. The Site includes about 14 acres in and along the stream bed of a small tributary to Little Walnut Creek. Contamination of the Site with hazardous substances, including mine spoils located in a small drainage next to the Cleveland Mine portal, and tailings sediment located within the stream bed of Little Walnut Creek and its tributaries. Additionally, localized ground water-contamination had been identified at the base of the tailings piles. Hazardous substances released from the Site and found in soils as well as in shallow ground water include, but are not necessarily limited to: arsenic, beryllium, cadmium, copper, lead, mercury, and zinc. The State of New Mexico and Department of the Interior - U.S. Fish and Wildlife Service are trustees for natural resources injured by releases at the site.