ROOF FALL OCCURRED IN A KNOW BAD ROOF AREA. AREA WAS BOLTED WITH 3' AND 6' FULLY GROUTED RESIN. AREA HAD BROKEN UP WITH WATER COMING OUT SO ARE SET 4 WOODEN CRIBS INBY INTERSECTION. AFTER WE H AD MOVED TO NEXT SET OF ROOMS. FALL WAS 25'X 20'LONG AND WIDE 6' HIGH. FALL WAS IN THE #3 ROOM #4 INTERSECTION AT ABOUT 210' IN FROM STAFF OF ROOMS.