A tailgate blockage occurred when the roof fell near XC-8 in the LW tailgate. The fall blocked travel off the face into the TG. The fall was approx. 23 ft long and was up to approx. 14 feet high. It extended rib to rib and went outby the corner of the coal block approximately 3 feet. Two passes provided a passageway in to the TG. Contacted MSHA by phone.