AN UNINTENTIONAL ROOF FALL OCCURRED BETWEEN 10 + 10 ON THE 16TH IN BELTLINE. THE FALL 55'LONG & 19'WIDE & 5'THICK. DID NOT IMPEDE TRAVEL OR IMPAIR VENTILATION BUT DID CAUSE DAMAGE TO THE BELT & BELT STRUCTURE. THE ROOF WAS SUPPORTED BY 4'GLUE BOLTS & TIMBERS & CRIBS. THE AREA WAS DEVELOPED IN JANUARY 2001.