AN UNPLANNED ROOF FALL WAS DISCOVERED BY SUPERINTENDENT. FALL LOCATED IN #4 ENTRY, SPAD #0583 ATA DISTANCE OF 4600' FROM ACTIVE FACE. RETURN AIRWAY VENTILATION IS NOT AFFECTED BUT IT WILL NOT ALLOW THE PASSAGE OF PERSONS. FALL MEASURES 80' X 18' X 9' AND IS SUPPORTED BY 8'TORQUE TENSION BOLTS. THIS AREA HAS BEEN DANGERED OFF.