A ROOF FALL OCCURRED 40' INBY SPAD 13663 IN THE #1 ENTRY (YIELD PILLAR PROP ENTRY) OF THE ""F"" PANEL DRIVAGE OFF THE W. MAINS; IT AVERAGED 30'L, 21'W & 7.5'H. IT STARTED AT TIP OF SHIELDS & EX TENDED OUTBY FOR A DISTANCE OF 30'. THE ENTRY WAS TWIN SEAM MINED, AND NO PERSONS OR PROPERTY DAMAGE OCCURRED.