Fall was outby survey station in the #2 neutral entry on Southwest Mains. It fell in an intersection and measured 30' long by 30' wide by 8' in thickness. It was located approximately 1800' outby the 010 mmu. No persons or equipment were affected by the fall. Set at least 2 rows of timbers on each side of the fall. Do not intend on cleaning the fall up. No ventilation was impaired.