MINER WAS RETREAT MINING IN #7 HEADING, THE 2ND LIFT HAD BEEN FINISHED UP ON THE BLOCK AND THE MINER HAD STARTED BACKING OUT WHEN A PILLAR FALL OCCURRED WHICH CAUGHT THE HEAD OF THE CONT. MINI NG MACHINE. PILLAR FALL WAS INBY ROOF BOLTS AND UNABKE TO DETERMINE SIZE. NO VENTILATION WAS DISTRUBED. NO INJURY OCCURRED, AND THE FALL WILL NOT BE CLEANED UP.