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.

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

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