Currently occupied by an electricity substation this site represents the weir (possibly surviving near Heeley Baths) and the site of the head race and buildings associated with the 'Heeley Corn Mill' described by Crossley et al in 1989 (p106) and SMR PRN 1735. Crossley and his team suggested this mill was in existence before the establishment of Norton 'New Mill' in 1513. A Fairbank plan of the mill in 1770 (Sheffield Archives HC 61) shows that by 1770 a significant small urban settlement was developing between the Mill and the newly turnpiked road to Chesterfield. Fragmentary legibility of this complex persists in a small overgrown channel to the north of this polygon which may represent part of the dam overflow.