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A rotary dump
A rotary dump

    We too must go back to the surface. First we ask our guide about the timbers we see. Do they keep the mine roof from falling down on the miners' heads? "No," he says, "the timbers overhead merely help to keep loose pieces of rock and coal from falling down." (The hard, light helmets the miners wear often save them from being hurt by such falling rock or coal.) Huge posts or pillars of coal twenty or thirty feet thick have been left to hold up the roof until the rooms are "worked out" and the miners are ready to leave that part of the mine and let the roof fall.

View down mine tunnel