AN UNINTENTIONAL ROOF FALL OCCURRED AT THE MAIN NORTH RETURN, ENTRY #4 INTERSECTION OF OLD BELT LINE, NUETRAL AIR, 1650'NORTH. THE FALL WAS APPROXIMATELY 55'LONG, APPROXIMATELY 20'WIDE AND APP ROXIMATELY 10'THICK. THE FALL DID NOT AFFECT VENTILATION OR PASSAGE OF MINERS. THE FALL WILL NOT BE CLEANED UP.