A roof fall was discovered by the fireboss at approx 1:15 pm. The fall is located in the left return off Lick Fork Mains #3 approx 3,700 feet outby the #002 MMU near SS #8571 at the mouth of the Panel 12 Left. The fall measured approx 20' long x 26' wide x 7-9' thick. No equipment, no injury occurred and no ventilation interruption occurred as a result of the fall.