The Morenci open pit mine and the topography of the Arizona Transition Zone, with Morenci’s two 600-foot-high smelter stacks at left.

Trump is giving Resolution the boost it needs, but obstacles remain for the $10 billion project ...

Reaching the site of the biggest undeveloped US copper deposit requires a 15-minute drop by steel cage into the sweltering bowels of the Arizona desert. There, more than a mile beneath the surface, ...

With only weeks until a disputed land swap opens the door to a huge copper mine at Oak Flat, opponents seek a late reprieve.

An appeal from Apaches who want to halt a massive copper mining project on federal land in Arizona that they hold sacred has been rejected by the Supreme Court.

The San Carlos Apache Tribe and environmental groups say exploratory drilling near the San Pedro could imperil protected ...

Social Security checks will be sent out pretty much like normal in August, with one exception. Here's what to know about ...