Years of mining for zinc and lead has left Picher, Oklahoma, near the border with Kansas, literally full of holes—including this sinkhole seen in 2008. Some mines were dug too close to the surface, and the roofs were unable to support the weight of earth on top, leading to collapses.
“It has happened in Missouri and in western Pennsylvania from coal mining,” Missouri State’s Gouzie said. “We’ve gotten better with buidlng mines so the roofs can support the weight over top of them.”
“It has happened in Missouri and in western Pennsylvania from coal mining,” Missouri State’s Gouzie said. “We’ve gotten better with buidlng mines so the roofs can support the weight over top of them.”
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