EE STATED HE WAS IN THE PROCESS OF INSTALLING ROOF SUPPORT IN #7 ENTRY ON THE #001 CONTINUOUS MINER SECTION. APPROX. HALF OF THE CUT WAS BOLTED AND EE WAS SET UP ON THE 1ST BOLT OF THE NEXT ROW. WHEN HE STARTED DRILLING, A PIECE OF DRAW ROCK APPROX. 12"" X 8"" X 2"" THICK SUDDENLY FELL, STRIKING HIM ON THE LEFT HAND. LACERATION TO RING FINGER; 6 STITCHES TO CLOSE WOUND.