AT 20 XCUT IN THE NO. 1 ENTRY OF SOUTH MAINS ""B""MAIN RETURN A ROOF FALL WAS FOUND. FALL IS APPROX. 8-10'HIGH X 20'LONG X 23'WIDE. AREA WAS SUPPORTED BY 8'INSTALL III BOLTS AND RESIN WITH WIRE MESH SCREEN. FALL DID NOT AFFECT VENTILATION BUT DID AFFECT ALTERNATE ESCAPEWAY WHICH WAS CORRECTED BY TIMBERING OVER TOP OF FALL. CAUSE WAS ROOF DETERIORATION.