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Molycorp proposes to construct and operate a molybdenum tailings disposal facility on 1,230 acres of public land near Questa, New Mexico ... the project would consist of a 568-acre tailings pond in the saddle of Guadalupe Mountain. The pond would be formed by the construction of two rock-filled dams at either end of the saddle. Other facilities would include a tailings pump station, an extension of the tailings pipeline, tailings distribution lines, access roads and a patrol road, a powerline, a seepage collection pond, surface water diversion channels, and a decant water channel. The project would provide additional storage for approximately 200 million tons of tailings from Molycorp's molybdenum mine located approximately 12 miles east of Guadalupe Mountain.
"In May 1985, Dames & Moore was retained by Molycorp to expand on previous hydrogeologic investigations pertaining to the siting of a new tailings disposal facility at the Questa Division. The focus Dames & Moore's investigations has been the evaluation of ground-water flow patterns, ambient ground-water quality, and possible impacts of tailings leachate to ambient ground-water quality in the area near the confluence of the Red River and the Rio Grande"--from Summary and Discussion.