A roof fall was found in numbers 1 and 3 entries at cross cut 20 in our M4 zone. The falls were approx. 20' X 20' X 15' high. The falls did not affect ventilation, passage of miners or cause injury. The falls occurred in the intersections only. The area had been supported with 6' fully grouted roof bolts. The MSHA hotline was notified of the accident.