WHILE WORKING TO FREE A CONTINUOUS MINER STUCK IN A CUT A PIECE OF SHALE 2' X 1.5' X 6' FELL FROM THE ROOF & STRUCK THE MINER, BREAKING INTO SEVERAL PIECES, ONE OF WHICH STRUCK THE VICTIM. A ROW OF ROOF BOLTS WAS 1.5'-2' FROM EDGE OF THE BROW. WORK AREA WAS FULLY BOLTED & 4 ROWS BEHIND UNSUPPORTED ROOF. LACERATION NEAR LEFT EYEBROW. RELEASED TO FULL DUTY.