Pump Engine House To Lyle'S Shaft At Sw 688 401

The pump engine house for Lyle's shaft, located at SW 688 401, was built between 1879 and 1880 for Wheal Basset Mine. It is now derelict and constructed from coursed granite rubble, featuring a bob wall made of large granite blocks and brick arches over the openings. The building has a rectangular plan aligned on a north-south axis, with the bob wall on the north side and a chimney attached at the south-west corner.

The structure consists of three stages, with round-headed openings, except for the driver's window in the bob wall, which is segmental-headed. There is a very large cylinder door in the rear wall and one wide window on each stage above. Some windows are present in the side walls, but these are mostly hidden by ivy as of the last survey in 1988. The tapered cylindrical chimney, now covered in ivy, terminates at gable level.

Historically, this engine house was erected when Wheal Basset Mine acquired the southern half of the former North Basset Mine. It housed an 80-inch engine and was responsible for pumping from Grace's shaft to the west using a flat rod. This building functioned alongside the winding engine house to the west and is visually grouped with the West Basset stamps to the north.