With copper prices surging, Tucson-based Asarco LLC is likely to expand two of its Southern Arizona mines. The Ray and Mission mines are the ones most likely to be expanded, a United Steelworkers ...

PHOENIX — A federal appeals court has halted efforts by Tucson-based Asarco LLC to obtain nearly 11,000 acres of federal land near the company's Ray Mine to expand its copper mining operations. In a ...

With help from the White House, a shuttered copper smelter in Hayden could reopen and boost a 'ghost town's economy.

Add Yahoo as a preferred source to see more of our stories on Google. Arizona’s water laws are badly outdated on multiple fronts, so changes to federal laws that affect the safety and security of our ...