A FALL OF THE ROOF OCCURRED IN THE 3RD S.W. SUB-PANEL, #6 ENTRY AT X-CUT 12. THE FALL WAS 50' OUTBY THE TAILPIECE. THE FALL MEASURED 90' LONG X 19' WIDE X 8' HIGH. NO PERSONNEL OR VENTILATION WAS AFFECTED. A SHUTTLE CAR WAS UNDER THE FALL. THE CAR HAS BEEN REMOVED.