UNINTENTIONAL ROOF FALL IN THE 4-WAY INTERSECTION OF THE #7 ENTRY OF THE 6TH NORTH AT 63+30. 60'LONG, 19' WIDE, 10' THICK. DID NOT IMPEDE TRAVELOR IMPAIR VENTILATION. ROOF SUPPORTED BY 4' FULL Y GROUTED ROOF BOLTS. THE INTERSECTION WAS DANGEDEVELOPED MAY 2001.