AN UNINTENTIONAL ROOF FALL OCCURRED IN THE #27 BLOCK OF 4 LEFT 1 NORTH RETREAT SECTION. THE FALL EXTENDED FROM THE GOB INTO THE #3 ENTRY PARTIALLY COVERING TWO MOBILE ROOF SUPPORTS. SIZE OF FALL COULD NOT BE DETERMINED, BUT APPEARED TO BE25'-35'HIGH. AREA WAS SUPPORTED WITH 6' CONVENTIONAL ROOF BOLTS ON A 4' CENTER PATTERN. PRODUCTION WAS INTERRUPTED FOR APPROX. 14 HOURS.