I forget the name of the mine, but there was a labor contract between the miner's Union and the owners that included a clause requiring that if the mine were ever closed the owners had to allow the Knockers to leave and move on to another mine. I believe this was in or around the 1930's but I could be mistaken.
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Amazing! I like that a lot. I'm from northern England and just remembered the tradition of Bluecaps here; a type of coal mining kobold who would push the wagons about with great strength and get paid for it. I could swear there were legends of floating lights in the mines here too, but can't find anything on that beyond will o' wisps.