A ROOF FALL WAS DISCOVERED DURING PRESHIFT INSPECTION AT THE #1 ENTRY 2 NORTH MAINS SS#4080 MEASURING 35'X 20'X 10' INTERSECTION FELL AND EXTENDED 5' ON EITHER END AND APPROX. 15' INTO RIGHT C ROSS CUT. THE ROOF WAS BOLTED WITH 6'TR BOLTS & PROBABLY (6) 10"" CABLE BOLTS IN INTERSECTION. CABLES TO (MINER, SHUTTLE CAR & BOLTER) WERE INVOLVED.VENTILATION O-K, INJURY DID NOT OCCUR.