A ROOF FALL OCCURRED ON UNIT 2 IN ENTRY #1 INTO OLD RETURN ROOMS. THE FALL MEASURED 300' LONG X 18 1/2' WIDE X 9' THICK. THIS AREA HAD BEEN BOLTED WITH 6' FULLY GROUTED & 9'THICK. THIS AREA HA D BEEN BOLTED WITH 6' FULLY GROUTED & 9' DOUBLE LOCK BOLTS. ALL APPROACHES TO THIS AREA WILL BE TIMBERED OFF.