A unplanned roof fall occurred in the #1 Entry at spad # 6731. Fall is 500' from active 003-0/004-0 section. Area was initially supported with 5' torque tension bolts. Fall meas. 20' L. X 24' W. X 6' H. Ventilation and passage of persons were not affected. Fall will not be rehabilitated. State and Federal agencies were notified immediately.