This polygon covers the site of Ruddle Mill, the mill goit and millpond. Formerly known as the Union Colour Mill, the water powered site was used for grinding ruddle, a type of red ochre. The current building was built around 1812, probably replacing an earlier mill on the site. It was converted to a corn mill by 1840 and had fallen into disuse by 1877 when it was put up for sale. The mill pond has been filled but the goit, 'Ruddle Dike', appears to still be extant. The mill itself appears ruinous in an aerial photograph of 2003. Legibility is partial as the buildings, although ruinous, still survive as do the place names Ruddle Mill, Ruddle Dike and Ruddle Mill Holt.