The Magma copper mine, which started operation in Superior in the early 1900s, was halted in 1982 as copper prices plummeted. Superior’s population fell from more than 5,000 in 1970 to around ...

Resolution Copper plans to pump up to 600,000 acre-feet of groundwater — nearly 200 billion gallons — to process ore and transport nearly 1.4 billion tons of toxic mine waste to a site called ...

Arizona federal land swap for copper mine would further exploit Native Americans (Letters) Oak Flat Arizona, which risks becoming a two-mile-wide copper mine due to a federal land transfer to a ...

A study by Arizona-based Elliot D. Pollack and Company found that Resolution Copper Mine could produce as much as $64.1 billion in economic value over the estimated 60-year mine life, about a ...

Congress approved a land swap in 2014 that would give Resolution Copper 3.75 square miles (9.71 square kilometers) of forest land in return for eight parcels it owns in Arizona.

The Supreme Court on Tuesday rejected an appeal from Apaches who are fighting to halt a massive copper mining project on federal land in Arizona that they hold sacred. The justices left in place ...

A federal agency says an environmental review for a proposed copper mine in Arizona falls short on details about water and the potential impacts of climate change.Ross D. Franklin/AP ...

PHOENIX — Rosemont Copper Co. agreed in principle to give the Arizona Game and Fish Department $10 million for programs protecting wildlife habitat around a proposed mine near Tucson.

BHP Billiton <BHP.AX> has agreed to sell its Pinto Valley copper mine and a railroad in Arizona to Capstone Mining Corp <CS.TO> for $650 million (418 million pounds), reaping far more ...

WASHINGTON (AP) — The Supreme Court on Tuesday rejected an appeal from Apaches who are fighting to halt a massive copper mining project on federal land in Arizona that they hold sacred. The ...