AN UNPLANNED ROOF FALL OCCURRED ON THE 22 RIGHT MAINS SECTION, #3 ENTRY, 150 FEET INBY SURVEY STATION NUMBER 2508, TRACK ENTRY. THE FALL MEASURED 18 FEET WIDE, 35 FEET LONG, 4 TO 5 FEET THICK. THE AREA WAS SUPPORTED WITH 4 FOOT RESIN ROOF BOLTS. THE ROOF FALL WILL BE CLEANED UP AND THE AREA RESUPPORTED. THE FALL OCCURRED ON AN IDLE SHIFT. A SUPERVISOR DISCOVERED THE FALL.