101 1/2 BLOCK #9 MOTHER BELT-INJURED AND CO WORKER WERE BOLTING WITH A GOPHER DRILL. INJURED LOWERED DRILL AND WAS REMOVING DRILL STEELS FROM THE ROOF. A 5' STEEL FOULED IN THE HOLE, AS INJURE D WAS PREPARING TO REMOVE IT, IT FELL AND STRUCKHIM ON THE BACK OF HIS LEFT HAND.