Freeport-McMoRan, Rio Tinto and BHP are among the miners testing sulfide leaching as tariff threats send copper prices soaring.

Arizonans can still weigh in on the Copper Creek exploratory project. The Bureau of Land Management’s public comment period ...

The North America Copper Mines segment operates open-pit copper mines in Morenci, Bagdad, Safford, Sierrita, Miami in Arizona and Chino, and Tyrone in New Mexico. The South America Operations ...