A unplanned roof fall occurred in the 1st panel in the #7 entry at spad 1686 in the return air course. Fall is approx. 5,700' from nearest active section. Fall will not be rehab. Passage of person and ventilation was not affected. Fall meas. 160'X20'X4' area was initially supported with 5' torque tension roof bolts. Federal and State agencies were notified immediately.