A ROOF FALL OCCURRED IN THE NORTHEAST MAINS #1 ENTRY #21 XCUT EXTENDING OUT APPROX 50 FT. THE FALL OF RIB IS AN UNDETERMINED HEIGHT. FALL WAS FOUND BY MINE EXAMINER MAKING HIS WEEKLY AIR COURS E EXAM. ALL APPROACHES WERE POSTED AND DANGERED OFF. VENTILATION NOT AFFECTED, NO INJURUES TO MINERS.