The Keweenaw Peninsula furnished eastern North America with the highest quality copper for millennia. Find out how archaic ...

A Canadian company has floated a plan to reopen the San Manuel copper mine more than 20 years after it closed northeast of Tucson, the Arizona Daily Star reported Sunday. Here are five takeaways from ...

Should you have feedback on this article, please complete the fields below. Please indicate if your feedback is in the form of a letter to the editor that you wish to have published. If so, please be ...