AN UNPLANNED ROOF FALL OCCURRED ON 8/31/00; THE FALL OCCURRED APPROXIMATELY 5 MI. FROM THE ACTIVE FACE. NO PERSONAL INJURIES AND NO EQUIPMENT WAS INVOLVED. TYPE OF AIRWAY IS NEUTRAL; VENTILA TION WAS NOT AFFAECTED. SIZE OF FALL 20' X 20' X 4'. ALL ENTRANCES TO THE FALL HAVE BEEN BREAKERED OFF. THE FALL AREA WILL BE REHABILITATED.