A PILLAR FALL OCCURRED 1 BREAK IN BY SS # 2644 WHILE PULLING THE END LIST OF #5 BLOCK. THE FALL MEASURED 25' DEEP BY 12' HIGH BY 12' WIDE. THE FALL WILL BE CLEANED UP ENOUGH TO RECOVER MINER. THE VENTILATION WAS NOT DISTURBED. NO INJURY OCCURRED. CONDITION CONTRIBUTING TO THE FALL WERE SLICK SIDED SLIP.