An unintentional roof fall occured on the 4C travel road at 46 crosscut. The fall did not affect ventilation or cause personal injury. The secondary escapeway was re-routed around the roof fall area. The fall measured 30 foot x 30 foot x 12 foot high. The area had been bolted with 6 foot fully grouted roof bolts and 12 and 16 foot cable bolts.