Helen Schneyer sings a song about coal mining which goes:

Lie there my laddies lie easy, lie easy The thoughts you were thinking will never be known Under two thousand feet of the Cumberland Plateau Where it's blacker than thunder and cold in the stone

I thought is was traditional, but when Helen sang it a NEFFA last spring and she said there was a songwriter, but I don't remember her name. Does anyone know who wrote it? I'd like to give credit when I sing