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Pennsylvania’s Coudersport Ice Mine is a typical example of a cold trap called a Glacière. The cold air in winter is heavier than the warmer air in the pit, so it falls deep into the pit, cooling it down. When the shaft was built, the cracks in the rocks were filled with ice, causing the miners to joke that they found an ice mine instead of a silver mine, which is how it got its name. Certainly they never found and silver there. And therefore the entire hill is called Ice Mountain after the ice in the Coudersport Ice Mine shaft.
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