NEW JERSEY — An unstable crater in the forest floor is just another reminder of the state's rich mining history and the many tunnels left behind and hiding just under the surface. Timothy Rack stands ...
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500,000 abandoned US coal mines to become giant underground water batteries with a new storage method
Beneath parts of the Appalachian Mountains, thousands of mine shafts still descend deep into the earth. Some of these vertical passages drop more than 1,000 feet, connecting long corridors carved ...
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