Swaths of Pennsylvania and many other states are honeycombed with old, unstable mines that can cause the earth to suddenly give way and threaten people and property. That's what searchers in ...

PENNSYLVANIA, USA — Swaths of Pennsylvania and many other states are honeycombed with old, unstable mines that can cause the earth to suddenly give way — a phenomenon known as “mine subsidence” that ...

An excavator clears out trees Thursday on an old mine site near Pella in Marion County. A state program is working to reclaim land that was once used for coal mining. The land will be turned into a ...

Below: Horse teams work the Smith Brothers coal pit in the community of Dawson, now part of Tulsa, in 1898. "If permitted to go on, this mining will jeopardize more than a half million dollars worth ...

Swaths of Pennsylvania and many other states are honeycombed with old, unstable mines that can cause the earth to suddenly give way and threaten people and property. That's what searchers in ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Swaths of Pennsylvania and many other states ...

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The device is called a Forced Reset Trigger; it allows a semi-automatic weapon to fire at a faster rate Read full article: Stop what you’re doing—get this MacBook Air for $199.97 (79% off!) Costco ...