A fall of roof above the anchorage of the 4ft resin roof bolts occurred in the #5 intake entry at 30c/c along the #2 belt. The fall was apx 20'lg X 20'wd X 6'thk. No one was injured during this event. The primary escapeway was blocked & all persons were evacuated outby the location until another primary escapeway could be established. The area was dangered & approaches cribbed.