This site addressed combination of multiple copper mining sites within southwestern New Mexico and southeastern Arizona, including the Chino, Tyrone and Cobre mines in New Mexico, and the Morenci Mine in Arizona. These open pit mines were mined in the late 1870 through 1900s. Hazardous substances released at the Sites include sulfuric acid and metals/metalloids, including arsenic, beryllium, cadmium, chromium, cobalt, copper, lead, manganese, mercury, nickel, selenium, and zinc. The primary sources of hazardous substances at the Sites include mine wastes, including tailings, waste rock, and spent ore leach piles, ore and leach stockpiles; mine waters, including pregnant leach solution, raffinate, tailings supernatant water,seepage from wastes and mined materials, and stormwater that contacts mine wastes. In 2011, rainwater ponded on leach piles that had been treated with sulfuric acid. These ponds then became acidic and injured migrating birds that stopped over in this desert area to rest.