EE AND OTHER WERE REMOVING 4' LONG SECTIONS OF STEEL SKIRT BOARDS ONT HE NEW C3 CONVEYOR BEING CONSTRUCTED INT HE SOUTH END OF THE STONE TUNNEL. HE BEGAN TO PULL A SECTION AWAY FROM THE CONVEY OR OR AT APPROX. 10:30 AM STANDING BETWEEN THE CONVEYOR FRAME AND THE TUNNEL WALL IN AN AWKWARD POSITION AND TWISTED HIS BACK HANDLING THE SECTION WITH OTHER. HE CONTINUED WORKING. THE BACK G