Boundary wall of former Hafod Copperworks canal docks

A high wall of copper slag, sandstone and brick, some 80m in length. The adjacent canal has been filled in. The lower parts of the wall are almost entirely of copper slag, either in carefully bedded rough nodules or in moulded blocks. A row of square slag copings seem to have been placed on top of this, but the wall was subsequently raised in stone and slag and topped with crenellations of oblong slag blocks interspersed with spade-shaped slag copings laid sideways. The wall was again raised in brick and stone, probably in the late nineteenth century. Two wide blocked archways can be seen supporting the wall where the canal dock entrances passed through.