AN UNINTENTIONAL ROOF FALL WAS DISCOVERED IN THE #1 ENTRY ON 2 LEFT OFF 2 NORTH MAINS 1 BRK INBY SPAD #2646. SIZE 60' LONG X 4' HIGH X 18-20' WIDE. WAS SUPPORTED WITH 4' FULLY-GROUTED RESIN BOLTS. NO INJURIES, NO EQUIPMENT CAUGHT, VENTILATION WAS NOT INTERRUPTED. FALL WILL NOT BE CLEANED UP.