Quote:
Originally Posted by jem
I can't see why not - I would imagine that if not maintained then the shafts and galleries would eventually flood, collapse or be far too hazardous to use again but I can't imagine that it would be impossible to dig new ones.
I expect that it would be far more expensive to dig new tunnels and hence make the cost of the coal higher but it might still be economic to do so in the future.
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Iirc it is impossible, shale gets in the coal seam and makes it unusable, that is iirc