Swaths of Pennsylvania and many other states are honeycombed with old, unstable mines that can cause the earth to suddenly ...

Others left pillars of coal in place to support the roof, but they don't always prevent settling over time. The state Bureau of Abandoned Mine Reclamation will examine the scene when the search ...

Crews will return to the abandoned coal mine in Unity Township Friday and start to drill holes in the ground — about 40 feet deep — to send cameras and drones down into the mine to try and ...

Credit: Illustration by Julia Wytrazek / Getty Images There are about 500,000 abandoned mines in the ... from poisonous gases present in many old coal mines." Mine shafts "can extend hundreds ...