An Arizona land auction for a Canadian mining company's Copper World project faces opposition from residents and Pima County.

A recent court ruling allows one of world’s largest mining companies to move forward in an area of religious and cultural ...

By Ernest Scheyder HOUSTON, March 24 (Reuters) - Rio Tinto aims to open Arizona's Resolution Copper mine by the mid-2030s but ...

A Canadian company wants to reopen the San Manuel copper mine more than 20 years after it closed northeast of Tucson.Five takeaways from Sunday's story about a Canadian company's plan ...

The U.S. Forest Service transferred ownership of Oak Flat to Resolution Copper on Monday, a major setback for opponents of a ...

A federal land transfer giving Resolution Copper nearly 2,500 acres in eastern Arizona, including a sacred site for the Western Apache and other Indigenous people, is officially complete.

The closed mine in San Manuel could reopen under a deal announced by a Canadian company that also wants to develop a major new mine 55 miles northeast of Tucson.

The transfer of federal forest land in Arizona to a pair of international companies that plan to mine one of the largest ...

In a news release issued March 16, the U.S. Department of Agriculture’s Forest Service says it has completed the Southeast Arizona Land Exchange and issued the final record of decision for the ...

Establishes a major copper hub in southern Arizona with the addition of the Cactus project to Hudbay’s existing Arizona business, including the Copper World project Strategically positions Hudbay to ...

Rio Tinto expects to open Arizona's Resolution Copper mine ​by the mid-2030s, a senior executive of ‌the miner told Reuters ...