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"The Problem With America’s Abandoned Mines"

"A mine plans its death before its birth. The leftover waste from mines is so hazardous that mining companies must figure out what to do with it decades in advance, even before they start digging.

That’s how it works today, at least. But in 1981, when the United States government began requiring mines to have rehabilitation plans, many operators simply up and left instead. The government has identified about 46,000 abandoned mines on public lands alone. Some of them are top-priority Superfund sites.

But most haven’t even been mapped. By some estimates, there are as many as half a million abandoned mines in the U.S. These sites have the potential to contaminate water, pollute soil, kill wildlife and sicken humans, to say nothing of the risks of falling down a hidden mine shaft. (This is a legitimate concern in some areas – in California, the state employs teams that scour the state looking for abandoned mines and plugging them up. There was even a “Dirty Jobs” episode about these folks.)"

Rachael Bale reports for the Center for Investigative Reporting October 21, 2014.