An extensive flue system, likely to have been below ground, was in use at the lead works (SMR 4116). It was well developed by c.1850 and parts of it may date from the first use of a smelter on the site in 1787. Two widths of flue are shown on the plan, approximately 0.70m and 1.40m wide. Flues on lead smelting sites vary in cross-section but were often rectangular to allow children to clean them and reclaim precipitated lead fumes. These flues may therefore be up to 1.5m deep. {1}

A quay is shown here in 1771 and may have been established much earlier. It was therefore in existence before the establishment of the leadworks (SMR 4116), and appears to be the quay leased by the lead works in 1784. The quay was subsumed by land reclamation when the edge of the river was reclaimed between 1827 and 1844. {1}

Inclined plane linking nearby colliery (SMR 4118) to the river. First shown on a map of c.1830, although it is likely to be earlier than this since the colliery was opened in c.1805. It was closed and removed between 1849 and 1859. It appears likely to lie beneath Back Mitford Street although inaccuracies with the historic mapping mean this cannot be confirmed. {1}

An open rope walk is shown on the OS map of 1859 but not on the 1894 map, when it had been built over by a school and a number of other unidentified buildings, probably industrial in nature. It is not shown on an 1849 map, and is unlikely to have consisted of any substantial structures {1}.

These coal drops are of a type that would usually be fed from a railway line. One of the drops is of apparently 19th century stone construction and was located immediately behind an engine house shown on the c.1850 plan. It is probable that a wagonway or other track existed between the coal shaft (SMR 4118) and the engine house, although there is no map evidence for this {1}.

A roughly circular mound, measuring c45m in diameter, apparently with a spiral track leading to its top. It appears to be a spoil heap, and is shown on maps from 1859 to 1914, but is no longer shown in 1940. It is possible that this mound contained lead smelting waste, although it is unlikely that any ore smelting took place on the site. It is more likely to be either a coal heap/storage area from the coal mine to the north (SMR 4118) or a general waste tip containing spent tanning bark, coal ash or broken ceramic jars. {1}

A building referred to as the power house on a site plan of 1955, and referred to as the power house by the present managing director. It is not clear whether it housed a hydraulic engine or was a hydraulic pumping house. It appears likely to have been a source of hydraulic power for powering presses etc, in the pipe mill (SMR 4901) on the site. The structure was built between 1914 and 1940, relatively late for the use of hydraulic power, and consists of four stories, all presently unused. The lower floors have been unused since before 1955 and may contain the remains of hydraulic machinery {1}.

This building was constructed after 1859, probably in 1874, on the site of a number of earlier buildings. It was built as a pipe mill and probably contained the 6 hydraulic presses noted in a sale catalogue of 1884. The upper floor was rebuilt and re-roofed prior to 1980 to be used as offices, but currently houses welfare facilities. The lower floors are not used at present. The two northern corners of the original building survive at upper floor level. The southern face of the building was rendered between 1969 and 1980. Lead pipe was originally produced by soldering or welding sheet lead which had been rolled into a cylinder. Later it was produced by drawing and extrusion, in a similar way to the manufacture of wire. The pipe mill built in c.1874 would almost certainly have been producing pipe by drawing and extrusion. The earlier pipe mill, shown to the west of the main white lead stacks area on a plan of c.1850 is likely to have been producing pipe by welding. {1}

A jetty to provide lead works (SMR 4116) site level access to the river, built between 1827 and 1844. It may have been easier to move goods on the level and then to lower or hoist them rather than using an inclined plane. It seems to replace the use of the quay (SMR 4907) as the main point of site access from the river {1}.

The lead works (SMR 4116) site office, if it survives inside the later rebuilding, is probably the oldest upstanding structure on the site. It appears to have lain in the residential part of the original 2 acre site, and is apparently shown on the earliest map available of the site. It may have originally been housing rather than an office {1}.