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Leaching Tests on Chino "J" Dump Core Samples.
McKinney-WA; Evans-LG; Simpson-WW
Soc Min Eng AIME Feb 15-19 1970 Preprint 70-Ag-77, 1970 Feb; :5 pages
The U.S. Bureau of Mines, Kennecott Copper Corp., and New Mexico Institute of Mining and Technology are cooperating on a research project to improve extraction of copper from previously leached waste dumps that are in part compacted and impervious to leach solutions. The field work is being done at the "J" leach dump, Chino Mines Division, Kennecott Copper Corp., Santa Rita, New Mexico. The laboratory percolation leaching tests were made at the Bureau of Mines Salt Lake City Metallurgy Research Center on drill core samples from the "J" dump to determine how much copper might be leached if permeability could be restored by explosive heaving or other means. The core samples from nine drill holes on "J" dump contained from 0.06 to 0.14 percent copper. Copper extractions ranging from 15 to 38 percent were obtained in 75 days by percolation leaching of minus-1-inch material with dilute sulfuric acid. The tests results indicate that about 27 percent of the copper remaining in the "j" dump could be extracted under ideal leaching conditions.
Soc. Min. Eng. AIME, Feb. 15-19, 1970, Preprint No. 70-Ag-77