AN UNINTENTIONAL ROOF FALL OCCURRED IN THE #3 ENTRY (RETURN) AT #6 CROSS CUT IN THE FIRST SOUTH, MAIN EAST - THIRD SOUTH PANEL. THE ROOF FALL WAS 80'LONG, 18'WIDE AND 8'HIGH. THE AREA WAS BOLT ED WITH 6'FULLY GROUTED ROOF BOLTS AND 2"" X 6"" X14'LONG BOARDS HAD BEEN INSTALLED IN THE IMMEDIATE AREA AS SUPPLEMENTAL SUPPORTS. THE ROOF MATERIAL CONSISTED OF LAMINATED SANDY DARK GRAY SHAL