A roof fall occurred in the J1 butt section in the #3 entry 75ft. inby survey station 2682. The fall measured 20ft in width and 95ft in length, it was approx 7ft in height. Fall was found on a pre shift exam. No men underground when cave was found. Entrance to cave were timbered and dangered off. Moved to location 300ft outby cave area to resume mining in J1 butt rooms.