The Lamb and Flag Smelting Works, Including Entrance Gate Piers, Flanking Walls and Gate

The Lamb and Flag Smelting Works, including the entrance gate piers, flanking walls, and gate, is a former tin-smelting facility established in 1715. It was rebuilt in 1825 and extended shortly thereafter. The building is constructed from granite and killas rubble with granite dressings, and it features mostly grouted scantle slate roofs, with a three-quarter-hipped roof over the original building and gable ends on part of the later additions.

The layout consists of two nearly adjoining buildings positioned at right angles to each other. The main building, located on the left, includes the original rectangular foundry, an outshut in front of the left side, a wing at right angles to the rear left on lower ground, and an extension on the right side. The other building at the front right is rectangular and built in three stages.

The exterior has a simple design with wide doorways at the main front (in the middle and on the right), and a gable over the right-hand doorway. The other building, which faces left, has two narrow doorways (one midway and the other towards the right) with old panelled doors. The left-hand doorway features an old overlight with glazing bars, and to the left of this doorway is an original 12-pane, two-light casement window. An arched window opening is present in the left-hand wall of the rear wing. At the rear and right side of the rear wing, there are large doorways that open onto a loading platform.

The interior is simple and largely unaltered since the 19th century, with large round-arched openings at the front and rear of the original room. The original king post roof is heavily smoke blackened, and the machinery has been removed. Originally known as Treloth, the works were bought and operated by Doubus from 1825 until 1883.