ROOF FELL, SPAD LOCATION 14+65 IN 2RIGHT WHILE ROOMING IN THE EAST MAIN SECTION. ROOF FELL FROM RT. CROSSCUT (15'DEEP) WHICH WAS NOT BOLTED TO THE INTERSECTION (THAT WAS BOLTED). AREA MEASURED 19.5'WIDE X 25'DEEP X 12'HIGH. AREA WAS DANGERED OFF WITH CRIBS AND 2 RIGHT WAS DROPPED. NO EQUIP./PERSONS AFFECTED.