THE RIPPER HEAD ON THE CONTINUOUS MINER WAS CAUGHT BY A SANDSTONE ""HORSE-BACK"" SLIP THAT STARTED FALLING FROM THE PREVIOUS BLOCK THAT HAD BEEN PILLARED BACK IN THE PILLAR LINE. SIZE OF ROCK UN EQUIPMENT DAMAGE; NO BLOCKAGE OF VENTILATION ORESCAPEWAY. FALL NOT CLEANED UP: TIMBERED OFF AND DANGERED.