EE WAS ASSISTING IN OPERATION OF STOPER DRILL. WHEN DRILL RETRACTED FROM ROOF, DRILL STEEL HUNGUP IN HOLE THEN FELL STRIKING EE IN BACK OF HANDNEAR WRIST JOINT. HE CONTINUED WORKING UNTIL 10/ 2. WHEN OPERATING SINKER DRILL EXPERIENCED SWELLING IN HAND. X-RAYS REVEALED FRACTURE TO HAND.