An unplanned roof fall occurred in the #6 entry 2 breaks inby spad #4322. This fall is approx 2800' from active section in the return airway. Area was developed 10/15/09. Roof fall did not affect ventilation and/or passage of persons. The fall will not be rehabilitated. Size of fall 20'w X 20'l X 8' thick. State and Federal agencies notified immediately.