This was the site of the Swallow Hill Vitriol works which is marked on first edition OS maps but which fell out of use at the end of the 19th century. Prior to this there was an ironworks on the site which was run by Richard Swallow and comprised of two blast furnaces. 1855 maps named the cottages which would have housed the workforce at the ironworks as Furnace Cottages. Only one building remains. The ironworks transported its produce via the nearby Barnsley Canal which opened in 1799. Richard Swallow was declared bankrupt in 1808 and 1823. (ASWYAS 2002a). Historic maps show the area adjacent to this polygon to be made up of long thin fields which would have been part of the medieval open fields around Darton and Mapplewell. Darton is recorded in the Domesday Book but the earliest record of Mapplewell is from between 1190 to 1210 (Smith 1961, 317). There is no legibility of the former enclosures or the industrial uses of this land as it has been relandscaped.