EE WAS SETTING A TIMBER ALONG THE RIB WHEN THE RIB ROLLED OFF AND STRUCK HIM, TRAPPING HIM UNDERNEATH THE RIB, RESULTING IN FATAL INJURIES. THE TOTAL RIB ROLL WAS APPROXIMATELY 26'LONG x 8' HIGH x 18"" THICK. ACCIDENT WAS REPORTED TO MSHA HOT LINE ON THE DAY OF THE ACCIDENT.