A federal judge said the argument over allowing a land swap to proceed "tips sharply" in favor of the opponents of a copper ...

Copper mine foes asked a judge to stop the government from acting on Oak Flat mine plans until Supreme Court rules.

In Arizona, mining has long been one of ... By 1999, it was the largest underground copper mine in the country, but in 2003, it closed down and left thousands of miners without jobs.

The Alacrán project is positioned to be Colombia’s largest copper mine, and has already been ... will be the Perseverance copper project in Arizona, which it is exploring under a joint venture ...

Necessary minerals: Why can't the US mine and refine all its ... potential to become one of the largest copper mines in America, add $1 billion a year to Arizona’s economy and create thousands ...