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 poses a threat to people and property.
That's what searchers in Westmoreland County, just southeast of Pittsburgh, fear led to the disappearance of 64-year-old Elizabeth Pollard. Pollard and a young granddaughter were looking for a lost cat when she went missing Monday evening. At about the same time, a sinkhole appeared roughly 20 feet (6 meters) from where she had parked her car, in an area above an old coal mine. The granddaughter was found safe inside the car hours later, while the difficult and potentially dangerous search for Pollard continues.
