A ROOF FALL OCCURRED IN THE 6 NORTH PANEL IN THE #1 ENTRY STARTING AT THE PILLAR LINE OF CROSSCUT #58 AND PROCEEDING THROUGH THE INTERSECTION OF CROSSCUT #60. THE FALL MEASURED APPROXIMATELY 110' X 19' X 5'. THE AREA WAS SUPPORTED WITH 5' FULLY GROUTED REBAR BOLTS. THE FALL WAS CAUSED BY AN UNDETECTED SLIP.