AN UNINTENTIONAL ROOF FALL OCCURRED ON THE NO. 2 RETURN ENTRY BETWEEN NO. 50 AND NO. 51 ROOMS HAULAGE; THE FALL OCCURRED ABOVE THE ANCHORAGE POINT OF THE BOLTS. THERE WERE NO INJURIES NOR WAS VENTILATION AFFECTED; FALL WAS ABOUT 4' HIGH X 18' WIDE AND OCCURRED ON THE ENTRY BETWEEN INTERSECTIONS.