A FALL OF ROOF OCCURRED IN THE NORTHWEST MAINS IN THE #4 ENTRY FROM XCUT 68 1/2 TO XCUT 70. THE FALL WAS APPROX 80' LONG X 19' WIDE X 7-10' HIGH. THE AREA WAS PREVIOUSLY MINED AROUND 2-28-95 A ND WAS SUPPROTED WITH 7' DOUBLE LOCK BOLTS AND TIMBER, CRIBS, RAILBARS. THE PROBABLE CAUSE WAS AN UNDETECTED SLIP.