An unplanned roof fall occurred in the #5 entry on the #1 section @ Shonk Round Bottom. The fall occurred in the #5 entry spad #3989-4002. Fall measured 20' long x 17-18' wide x 4-8' thick. Area was previously supported by 5' Torque tension bolts with 8' cable bolts in intersections. This fall occurred 500' from the active 001-002 section. Area was originally developed 12/23/2010.