This polygon was last depicted as retaining industrial buildings (a later section of Hadfield's Hecla Works) on the 1987 OS 1:10000. The semi circular form of the site relates to the original course of the River Don. The river is shown on the 25 inch to the mile OS series as having been canalised at this point to its present course between 1891 and 1905. By 1925 Hadfields have colonised the site with an extension of the Hecla works.