AN UNENTERNTIONAL ROOF FALL WAS DISCOVERED ON 8-1-01 IN THE #6 HEADING INTAKE AT BACK 12. FALL WAS APPROX. 6' THICKER 20' LONGX 18' WIDE INTERSECTION. NO INJURIES, NO EQUPMENT CAUGHT, VENTILAT ION WAS NOT INTERRUPTED. THE AREA HAD BEEN BOLTED WITH 6' TENSION REBAR BOLTS.