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Detecting and Sorting Disseminated Native Copper Ores.
Miller VR; Nash RW; Schwaneke AE
NTIS: PB 234 073 :14 pages
The Bureau of Mines developed and evaluated a detector-sorting device to separate the copper-bearing portion from the barren portion of native copper ores. Small-scale sorting tests were run on minus 1-inch plus 1/2-inch size materials from the following Michigan samples: Winona, Kingston, and Centenial ores, and "poor" rock from the Champion Mine dump. Results showed that 60 to 85 pct of the copper was recovered in 9 to 19 wt-pct of the sorted fraction. About 90 pct of the copper recovered was obtained in the first pass through the sorter. For the Kingston and Centennial ores, combinations of sorter concentrates and fines generated during crushing resulted in recoveries of 93 and 94 pct, respectively, of the total copper in the samples. The combined products constituted about 66 wt-pct of the total sample and allowed the balance to be discarded with only a 6 to 7 pct copper loss.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 234 073
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division