Allen Mill was the centre of the lead mining industry in the Valley between 1600 and 1897. In the 19th century the site became one of the largest producers of Northumbrian silver at over 16,000 ounces a year. Part of the Allen Mill Regeneration site is scheduled ancient monument comprising ore bunkers, flue tunnels, smelting hearths and water wheel pits. This is being preserved and will be developed and interpreted as an industrial heritage trail. The site will also include nature trails and is linked to the river walk to Allendale town.