Rio Tinto’s Nuton venture is using microbes to remove copper from ores that are otherwise uneconomical to mine.

The decade-long legal saga over Resolution Copper’s planned copper mine in Superior has a new twist with involvement from an ...

The first-term lawmaker — who won a special election in September to fill her late father’s Arizona congressional seat — also ...

One of the world’s most productive copper mines is also one of Arizona’s most reliable sources of Rocky Mountain bighorn sheep. The bighorns are not shy about entering the Freeport McMoRan open-pit ...

Spanning over 60,000 acres, the Morenci copper mine in eastern Arizona — one of the largest-open-pit mines in the world — produces hundreds of millions of tons of copper ore each year. But the steep ...

A U.S. appeals court has temporarily blocked the transfer of federal forest land in Arizona to a pair of international companies that plan to mine one of the largest copper deposits in North America.

As her first piece of legislation, Rep. Adelita Grijalva has introduced a bill that aims to protect Oak Flat and halt what ...

Congresswoman Adelita Grijalva introduced her first bill, the Save Oak Flat from Foreign Mining Act, aiming to protect a ...

The federal appeals court temporarily blocked the land swap right as a public comment period wrapped up. A federal appeals court Monday temporarily blocked a land exchange in Arizona just hours before ...

Finding other people on the Arizona Trail is energizing, but people are also changing the trail along its final miles.

In the midst of a bleak economy and big losses in construction jobs, Arizona's copper star is shining brightly. Employment in the state's copper industry increased 25 percent last year, according to ...