AN UNINTENTIONAL WAS DISCOVERED AT SPAD 4 WHICH IS ONE BREAK INBY THE O/D NO.1 VENT SHAFT. THE FALL DIMENSION WERE APPROX. 6'H, 20'WIDE X 60' LONG. ONLY 1/2 OF THE INTERSECTION FELL AND EXTEND ED INTO CROSSCUT. THERE WAS NO INJURIES NOR EQUIPMENT AFFECTED.