UNINTENTIONAL ROOF FALL OCCURRED AT THE MILLENNIUM PORTAL AT THE 5N HEADGATE, ENTRY#2, CROSSCUT 40 @ 2721 NORTH. THE FALL WAS APPROX 35' LONG, APPROX 18' WIDE AND APPROX 10-15' THICK. THE FALL DID NOT AFFECT VENTILATION OR PASSAGE OF WORKERS. THE FALL WILL NOT BE CLEANED UP.