In Arizona alone, the Department of Environmental Quality estimates that between 40,000 and 100,000 abandoned mines could be scarring the landscape, although a full inventory has never been completed.

Arizona’s best ghost towns aren’t just empty buildings collecting dust. They’re gold mines frozen in time, saloons where you ...

Freeport-McMoRan, Rio Tinto and BHP are among the miners testing sulfide leaching as tariff threats send copper prices ...