RE: Confidence booster12 Sep 2018 18:17
In 1872 Deep Navigation Colliery Treharris was sunk to a depth of 692m at the time it was the deepest mine in the uk,
It was excavated by hand ,no d walling to stop water ingress and no shaft boring machine.and all this effort for a 3 meter coal seam the mine closed in 1992 how’s that for apples.