Unintentional roof fall discovered during examination. Fall was located at No. 1 section, 10 block, 9 entry, station 4824. Fall measured approximately 100'L X 18'W X 10'H. Previously supported with 10' cable bolts and 6' full grout resin bolts. Area developed on or about 8-3-2006. Approaches to the area were dangered off.