Roof fall was found in the No. 1 entry of South Mains B return (outby) at 34 x-cut. Fall did not obstruct ventilation or escapeways. Fall will not be cleaned up and is supported over top. Size of fall was approx. 25 feet long by 14 feet wide and 7 to 10 feet high. Bolted with 8' Install II bolts and point anchor resin. Cause was deteriorating roof conditions.