A ROOF FALL OCCURED ON UNIT #1 NW MAINS IN ENTRY #2 FROM SURVEY STATION 11 & 90 TO 12 & 60. THE FALL MEASURED 90' LONG X 18'9"" WIDE X 10'-12' THICK. THIS AREA HAD BEEN BOLTED WITH 6' FULLY GRO UTED & 9' DOUBLE LOCK BOLTS. ALL APPROACHED TO THIS AREA HAVE BEEN TIMBERED OFF.