AN UNINTENTIONAL ROOF FALL OCCURRED ON THE #5 BELT (#4 ENTRY) SIZE OF FALL WAS ESTIMATED TO BE 12' HIGH BY 17-19' WIDE BY 300-400' LONG, AREA HAD BEEN SUPPORTED WITH 4' RESIN BOLTS WITH SUPP LEMENTAL SUPPORT CONSISTING OF 6-9' CABLE BOLTS IN INTERSECTIONS. NO INJURIES OCCURRED, VENTILATION WAS NOT INTERRUPTED, FALL WILL NOT BE CLEANED UP.