There was an iron bloomery at Rockley from about 1522 (Umpleby 2000, 170). The site was excavated prior to the building of the M1 in 1966 which indicated that the bloomery was working at a time when many blast furnaces were replacing bloomeries (Crossley and Ashurst 1968, 10). The ponds associated with the site were just south west of the smelting site (ibid, 12). The site fell out of use in the mid 17th century (ibid, 29) and the pond and dam were destroyed at about this time. Stone from the dam may have been used to construct later dwelling on the site (ibid, 32). There is now no legibility of the iron working site or the later cottages beneath the motorway but there is partial legibility of the former woodland as trees have regenerated around the road. The site of Rockley corn mill may have also been within this polygon although the exact site is uncertain. The mill was working between the mid 13th century up until at least 1723 (Umpleby 2000, 168).