WHILE INSTALLING PRIMARY ROOF SUPPORT IN THE FACE OF #1 WEST, THE EMPLOYEE WAS STRUCK IN THE CALF OF HIS LEFT LOWER LEG BY DRAW ROCK. THE ROCK 2' X 3' X 3"" FELL BETWEEN THE PREVIOUS TWO ROWS OF ROOF BOLTS, STRUCK THE OPERATOR'S CANOPY, THEN STRUCK THE OPERATOR. AN AIR SPLINT WAS APPLIED AS A PRECAUTION. HE WAS TAKEN TO THE SURFACE, THEN TRANSPORTED TO THE LOCAL HOSPITAL FOR X-RAYS.