An unplanned roof fall occurred in the #2 entry on #9 Belt Panel at spad 4402. Fall measured 20' long x 20' wide x 6' thick. No equipment or injuries. Roof fall did not affect ventilation and/or passage of persons. The fall will not be rehabilitated. Area was developed 3/2010. Federal & State agencies notified immediately. There is no active section at this operation at this time.