AN UNINTENTIONAL ROOF FALL WAS DISCOVERED ON 1-22-01 IN THE #7 ENTRY(RETURN) AT #86 BREAK. FALL WAS APPROX. 20' W X 20' L X 6'-7'H(INTERSECTION). NO INJURIES, NO EQUIPMENT CAUGHT, VENTILATION WAS NOT INTERUPTED. THE AREA HAD BEEN BOLTED WITH 5' FULLY GROUTED RESIN BOLTS.