An unplanned roof fall occurred on the #1 section in entry #4 at spad #4367. No injuries reported. No equipment involved ventilation and passage of persons not affected. Fall measured 90' x 19' x 4'-6'. All entrances to fall have been breakened off. Area will not be relbilitated. Fell was 6 roof from the active face. MSHA and slate were notifed immediatley.