EE WAS RAISING WATER LINE ACROSS BELT AND TRACK ENTRY USING 1-1/2 TON CHAIN RATCHET. HE ATTACHEDRATCHET TO CLEVIS IN ROOF BOLT PLATE AND WHEN HEAPPLIED PRESSURE IT PULLED THE PLATE AND THE NUT OFF THE ROOFBOLT AND A PIECE OF DRAWROCK FELL STRIKING HIM IN THE SHOULDER.