Why do they (or did they) keep digging shafts of say 30 or 40 feel wide to get at these guys? Why didn’t they just dig one big hole that wouldn’t collapse. Perhaps I am not saying this right but I hope someone can understand what I mean.
For that matter of fact why don’t they mine that way. Why dig tunnels, why not just start at the top and remove the dirt until they hit the coal?
Is it a matter of cost? Or is it an environment thing?