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Excelsior Mining says it has signed a collaborative agreement with Nuton LLC to evaluate the use of Nuton’s copper heap leaching technologies in southern Arizona, Kallanish reports. Nuton, a Rio Tinto venture, would use the technology at Excelsior’s past-producing Johnson Camp copper mine in Cochise County, Arizona. The technologies are aimed primarily at sulphide minerals including lower-grade copper that might not otherwise be processed. The technolo…
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