A ROOF FALL OCCURRED IN #6 ENTRY OF L-MAINS SECTION. THE FALL IS IN AN INTAKE AIR COURSE. THIS FALL IS LOCATED 2 XCUTS OUTBY STA. #14727. NO PERSONS INJURED. VENTILATION WAS NOT INTERRUPTED. T HE FALL WAS 15' L X 18' W X 6'H. THE FALL WILL NOT BE CLEANED UP. ALL ACCESSES WERE TIMBERED OFF.