Montana Tech's Dr. Mohammad Sadeghi told residents Sunday that his team could have their findings in two to three weeks after studying the extent of the abandoned gypsum mine beneath ...

The U.S. Interior Department on Thursday took steps to increase recovery of critical minerals, used in everything from electric vehicles to high-tech weapons, from mine waste, coal refuse, tailings ...

A lawyer leading the class action lawsuit on behalf of a Black Hawk neighborhood against the state of South Dakota warned current and future homeowners that the ...

"Over 40 percent of small mountain streams in the West are polluted by heavy metals from abandoned mines," said CEO Chris Wood. "This bill is about clean water and healthy communities.

More than 23,000 abandoned mines dot public and private land in Colorado and at least 500 of them measurably harm water quality, according to the Colorado Division of Reclamation, Mining and Safety.

Arizona has an estimated 40,000-100,000 abandoned mines, according to the state's Department of Environmental Quality, though many are not mapped or marked.