A ROOF FALL OCCURED IN THE NO1 LW F PANEL ENTRY DURING RETREAT MINING. EGRESS WAS BLOCKED OFF THE TAILGATE TRAVELWAY & THE EGRESS PLAN WAS IMMEDIATELY IMPLEMENTED THE ROOF FAILURE WAS ORIGINAL LY 25' LX21'WX5' H & WITHIN 24 HRS HAD EXTENEDEDANOTHER 108 FT. THE TAILGATE WAS SUPPLEMENTAL SUPPORTED WITH CRIBS ON 15' CENTERS. THE ENTIEREFALL STARTED 38' INBY SPAD 13110 & EXTENDED TO 5