AN UNINTENTIONAL ROOF FALL OCCURRED AT THE 5420' STATION #1 ENTRY OF THE 1N LONGWALL TAILGATE ENTRY, MILLENNIUM PORTAL. THE FALL WAS APPROXIMATELY 75' LONG, APPROX 18' WIDE AND APPROX 8' THICK . THE FALL DID NOT AFFECT VENTILATION. SECONDARY ESCAPEWAY WAS REROUTED IN ACCORDANCE WITH THE APPROVED ROOF CONTROL PLAN. FALL #20D.