I can just see it now...what happens to an Oxygen tank in a fire or explosion? Miners who would have survived would be killed in the (more intense) fire or hit with shrapnel. Oxygen tanks in an enclosed area with a risk of fire are not a good idea.
I commend governor Manchin. Quick fixes tend to be ill conceived. Screw the tree huggers. One human life is worth 1,000,000 acres of trees. We can grow more trees. If snail darters and spotted owls are destined for the ash heap, so be it. I do not see anyone demanding the dismantling of the Hoover Dam.