A roof fall occurred 10'-15' inby survey station #6023 in the No. 3 entry on the 003-0 section. The fall measured approx 40' long x 20' w x 8' thick. The area had been bolted with 48"" resin bolts & supplemented with 12' cable bolts. The fall occurred in an area of known bad roof & began working on the 3rd shift. The area was dangered off. The fall occurred at approx 6:35 am.