ROOF FALL WAS FOUND BY 3RD SHIFT MINE FOREMAN ON THE #1 UNIT AROUND 0600. THE ROOF FALL WAS IN THE PILLAR LINE BETWEEN THE 1ST & WND LINE OF RETURN ROOMS AT SPAD #10+50 IN THE #3 RETURN ROOM. THE FALL WAS 30' LONG, 18' WIDE, 8' HIGH. THE SECTION HAD ALREADY MOVED OUT OF THIS AREA. INVESTIGATED BY MSHA 5-1-2000.