A ROOF FALL OCCURRED ON THE #1 UNIT IN THE 1ST LINE OF X-CUTS IN THE RETURN ROOMS IN THE 3RD NORTH PANEL OFF THE 3RD EAST STARTING AT SPAD #11+00 INTESECTION & CONTINUTING THROUGH INTERSECTIO N 12+ 00. THE ROOF FALL WAS 100' LONG, 18' WIDE AND 8' HIGH. MSHA PERSONNEL WERE CALLED AND IT WAS INVESTIGATED.