Rio Tinto has inked an agreement with Calibre Mining for the Borosi gold-silver-copper projects in northeast Nicaragua. The Borosi concessions include the mothballed La Luz-Siuna mine, the Santa Maria gold-silver project and the primavera gold-copper porphyry project. Rio Tinto and Calibre also plan to acquire exploration concessions in Nicaragua, with a focus on copper-gold porphyry, […]
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