Engine House At Sw639323, Nancegollan Mine Or Florence United Tin Mine

The engine house at Nancegollan Mine, also known as Florence United Tin Mine, is a disused beam engine house dating from around the mid-1860s. It is constructed from granite rubble with dressed granite quoins and jambstones, featuring brick arches and dressed coursed granite that is almost ashlar on the bob wall. The structure has a rectangular single-cell plan with a thicker bob wall on the south side, which overlooks the former shaft.

Although the machinery, floors, roof structure, and the framed and weather-boarded second floor and gable end over the bob wall have been removed, the tall engine house retains its original masonry, including the gable end on the north side. It stands 2-3 storeys over a basement and has round-headed window openings. The south bob wall features a wide central opening for the basement and a narrower opening above it. There are openings on each floor of the opposite north wall and a middle opening on the left-hand (west) wall of the first floor. Smaller openings for beams or machinery are spanned by wooden lintels.

This engine house was built for a 40-inch pumping engine, which presumably ceased operation in 1873 when the engine was advertised for sale. It is recognized as a good example of its type and is unusually complete.