A ROOF FALL OCCURRED MEASURING 20'LONG X 20'WIDEX 0-8'HIGH IN THE INTERSECTION OF SS #1604 ~5700FT OUTBY WORKING FACE. ABANDONED RETURN AREA. ABOVE ANCHORAGE BOLTED WITH 6' PA & 5' SUPER BOLTS NO EQUIPMENT INVOLVED. NO VENTILATION DISTURBED.NO INJURY OCCURRED. THE FALL WILL NOT BE CLEANEDUP.