The EPA is considering using robots and other sophisticated technology to help prevent mine "blowouts" or clean them up if they happen.
Gold King Mine
The UN Environment Program report tallied 40 significant mine waste accidents in the past decade. Most involved dams or other storage areas that failed.
The EPA is installing a barrier at the mine outside Silverton to prevent another spill like the one in 2015 that sent 3 million gallons of toxic water into rivers.
Health care, not the environment, was top of mind for many attendees at the crowded public meeting
Utah wants cleanup compensation and unspecified damages in the 3-million-gallon Gold King Mine spill that was accidently triggered by EPA contractors.
New Mexico sued Colorado in June 2016, saying Colorado should be held responsible for the contamination as well as decades of toxic drainage from other mines.
Some 300 gallons of toxic water are released each minute from the site above the town of Silverton.
The agency started work on safety standards after the spill and expects to soon finish them, investigators from the EPA's Office of Inspector General said.
Farmers, business owners, residents and others initially said they suffered a staggering $1.2 billion in lost income. But the total now appears to be about $420 million.
These are the largest cuts and potential impacts in EPA Region 8, which covers Colorado, Montana, North Dakota, Utah, Wyoming and 27 Tribal Nations.