Rockley Low Furnace was build between 1698 and 1704. At this time the earlier blast furnace (HSY6894) further to the west was still in operation (Umpleby 2000, 165). The furnace was supplied by the local Tankersley ironstone outcrops and the charcoal was available from coppiced woods in the surrounding area (Crossley 1980, 445). The furnace initially used charcoal but archaeological evidence has shown it was later converted to coke (Crossley 1995, 382). The furnace was supplied by water from two ponds east of Warren Dike. The ponds are now dry but the route the dike took remains. The furnace stack survives well above ground. There is significant legibility of the former wet wood as much of the site is covered by regenerated woodland.