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 ...

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

Rocky Mountain bighorn sheep have found a haven from predators at the Morenci copper mine in Arizona. State wildlife managers are relocating the sheep to prevent overpopulation and potential accidents ...

In a future defined by climate change and its consequences, some experts say Arizona will need copper mines for the wires in solar panels, desalination plants for reclaiming salty groundwater, and ...

The land swap at the heart of the long-running fight to block a controversial mine on Arizona land sacred to the San Carlos Apache Tribe could be undone by legislation introduced by U.S. Rep. Adelita ...

A newly elected Arizona congresswoman has introduced legislation that could upend a controversial land swap involving ...

President Trump this week threw his full support behind a massive project to turn a sacred Apache site outside Phoenix into one of the world's largest copper mines, meeting with mining executives at ...

The federal government ceded control to Arizona of "injection wells," a technology important in water management, mining and carbon capture. State environmental authorities will now take charge of the ...