An unplanned roof fall was discovered on weekly exam app. 12000 ft from the active #1 sect 1 xcut inby s.s. 2897 in the right return the fall does not impede travel nor block airway. The air is 100 ft in length x 19 ft x 6.5 in height. all entradces are areakered off. It will not be rehabiliated this was phoned in the field supervisor on 5/15/09.