Unintentional roof fall. Area was heard to be working prior to falling. Fall measured 40'L X 18'W X 10'H. Area was mined on11/14/06. Overburden is 360' in this area. Previously supported with 6' resin grouted roof bolts, supplemented with additional 6' bolts and jacks. Fall is located on #2 Section , 3 entry,Spad 5181. Reported to MSHA at 3:40A (G. Fetty)