At approximately 4:33pm a non-injury roof fall was found in the No. 1 entry on the MMU No. 001-0 section. The roof fall is located in the intersection at crosscut No 20 @ survey station No. 4739. The roof fall is approx. 20 ft wide x 30 ft long x 6' - 10' high. The areas adjacent to fall dangered off w/timbers and/or cribs to prevent access. MSHA was notified immediately