An unintentional roof fall was found at 8:10PM in return airway. The fall was between #3 and 4 entries. Approx 60' Long X 19' Wide X 6.5' High. The area was bolted with 4' resin and 6' torque tension bolts. Fall will not be cleaned up. Called toll free # @ 8:25PM on 01/08/11.