Resolution Copper (RCM) is a joint venture owned by Rio Tinto and BHP Billiton formed to develop and operate an underground copper mine near Superior, Arizona, U.S. The project targets a deep-seated porphyry copper deposit located under the now inactive Magma Mine. Rio Tinto has reported an inferred resource of 1.624 billion tonnes containing 1.47 percent copper and 0.037 percent molybdenum at depths exceeding . Following the passage of the 2015 National Defense Authorization Act, many Native American and conservation groups fear the copper mine will destroy sacred and environmentally sensitive land. - Source: Wikipedia
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