ROOF FALL WAS DISCOVERED WHEN I WAS GOING BACK TO BUILD WOODEN CRIBS IN 62 & 63 ROOM FACES OF THE 2ND NORTH BUTT SECTION. AREA WAS CHIPPING AND I HAD BUILD TO WOODEN CRIBS THERE. CAVE WAS 50' LONG X 18-20' WIDE AND 3 1/2' HIGH. AREA WAS BOLTED WITH 3' BOLTS ON 4' CENTERS.