Re: Hebburn Colliery 78 years ago the pit shafts?
Some old mine shafts were capped with timbers and covered with rubble and soil. Over time that timber will have rotted and could be the case with local pit shafts that closed in the early 1900s. In later years Ive heard an inflatable plug was lowered into place so many feet down the shaft & then inflated to seal the shaft. Then tons of concrete was poured in to create a massive plug.
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