A ROOF FALL MEASURING 60' LONG, 19' WIDE, AND 6' HIGH HAD OCCURRED IN THE #8 ENTRY RETURN OF THE SOUTHWEST SUBMAIN AT SPAD 25 + 50, APPROX 540' OUTBY TAILPIECE. DUE TO HIDDEN SLIP. THE AREA HA D BEEN TIMBERED AND BOLTED. THE FALL HAD BEEN TIMBERED AROUND.