A MINE EXAMINER DISCOVERED ROOF FALL ON PRESHFT IN THE 2ND SOUTHWEST BELT SECTION IN #17 ROOM AND XCUT TO #16 ROOM NECKS. AREA WAS ALREADY TIMBERED OFF BECAUSE OF BAD ROOF. FALL WAS 50'LONG BY 10' TO 20' WIDE AND ABOUT 7' TO 10' HIGH. AREA WAS BOLTED WITH 4' FULLY GROUTED RODS WITH OVERSIZE BEARING PLATES.