TECHNOLOGY

Excelsior pens deal for Rio Tinto backed copper technology

US-based Excelsior Mining has signed an option agreement with Rio Tinto venture Nuton.

 Excelsior also operates the Gunnison copper project also in Cochise County. Excelsior

Excelsior also operates the Gunnison copper project also in Cochise County. Excelsior

The two-stage agreement will see Excelsior permit Nuton to "further evaluate" its copper heap leaching technologies at Excelsior's Johnson Camp mine in Cochise County, Arizona. Nuton will also absorb...

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