AN UNINTENTIONAL ROOF FALL OCCURRED IN THE #2 ENTRY, AT THE #8 X-CUT LOCATED IN THE PANEL 8 EAST RETURN AIR COURSE. THE ROOF FALL WAS 40'LONG X 18'WIDE X 8'HIGH. SUPPLEMENTAL SUPPORTS HAVE BEEN INSTALLED AROUND THE ROOF FALL & THE ROOF FALL WILL NOT BE CLEANED UP. INITIALLY BOLTED WITH 4'FULLY GROUTED ROOF BOLTS. THE ROOF MATERIAL CONSISTED OF LAMINATED BLACK SHALE & A SAND STONE.