We had a non-injury roof fall occurring on the Right Fork Mains, in the 3 Entry, at xcut 22. The fall occurred in the Secondary Escapeway. There were no employees underground at the time. It measured approx. 30'long X 65'wide X 4-5'thick. The area was dangered off, both agencies contacted. An action plan was submitted and approved. EE discovered the fall conducting weekly exam.