The recent sinkholes on I-80 were caused by long-abandoned mines. See the map showing hundreds of closed New Jersey mines.

There are about 500,000 abandoned mines in the United States ... While there are obvious safety risks associated with these old mines, experts are also sounding the alarm on environmental factors ...

But the old mines also left behind a legacy of trouble for today’s Westerners. Abandoned mines dot the Western landscape, polluting the region’s streams with acid mine drainage and connecting the ...

Old mines pose myriad dangers, with 381 people killed and 152 injured at abandoned mine sites nationwide between 2000 and 2013, according to the U.S. Bureau of Land Management. In many cases ...