Fall discovered 3/24/09 at 1:40 pm. #5 belt, #2 entry, spad 17688, in the return. Fall was 30' x 20' x 8010' high. There was no equipment involved, no ventilation affected & no personal injury, however, passage of people was affected. MSHA & OMSL were notified and MSHA inspected. Area was breakered off and will be rehabilitated.