Darnall Works, part of which is designated as a Scheduled Ancient Monument with most of the other buildings protected as Listed Buildings, contains a unique survival of a large crucible works. The date of most of the current fabric (1871) reflects rebuilding on a site first occupied by steel refiners Sanderson Bros in 1835. The site was rebuilt with 180 crucible holes in order to provide bulk steel castings which could then be further processed at the company's Attercliffe Works (See Wray 1998 and Bayliss 1995). The site is currently disused with a large central building shown in 1964 recently demolished. In addition to the extremely significant remains of the crucible works the site is likely to contain significant archaeological deposits, the earlier mapping and SMR records recording at least two separate glassworks and a number of kilns and clay pits to the north and west of the site (possibly representing an earlier brick works.) Before industrialisation the site was likely to have been enclosed strip fields. Legibility is recorded as significant due to the prominence of visible crucible stacks, and surviving office buildings.