News3 mins ago
Coal Mining
3 Answers
On a similar vein (no pun intended!) to the question below, how did they sink coal shafts hundreds of feet in depth vertically years ago? I'm currently reading a book on coal mining in my area and the book seems to evade this issue. I can well understand the use of picks and shovels to dig the horizontal adits but how do you dig a hole to that sort of depth without it collapsing?
thanks
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