An unplanned Roof Fall was found at 6:50 AM in the common Intake of 3rd West. In Entry #3 at XC #35.5. It is 35 ft long by 20 ft wide and 5 ft high. It is at the anchorage zone and impedes travel. No one was injured or entrapped. Ventilation was not interrupted. Preliminary diagnoses; strata failure due to roof support not having good anchorage in competent top.