At approx 11:20 am belts went off. At 11:50 am a fall of roof was found between #7 cc and #8 cc on 5 belt. This is non 4 entry on 2 left off of north mains. Fall was between spad #5, 6871 and 6872. Fall is approx. 50' long x 18' wide x 8'-10' high. No injury occured. Area was timbered off and dangered off. Federal was notified. via 1-800 number at 12:05 pm