AN UNINTENTIONAL ROOF FALL WAS DISCOVERED IN THEBARRIER CUT-THRU FROM 4 LEFT 1 NORTH SECTION INTO THE OLD 3 LEFT 1 NORTH BLEEDER ENTRY (SURVEY STATION 7842- 7140.) SIZE OF FALL COULD NOT BE DETERMINED, BUT THE HEIGHT WAS ABOVE THE ROOF BOLT ANCHORAGE. THE APPROACH HAD BEED SUPPORTED AND DANGERED OFF. AGE OF FALL COULD NOT BE DETERMINED BECAUSE FALL WAS NOT REPORTED TO MINE.