Winding Engine House on Site of Wheal Uny Mine at SW 695 407

The winding engine house, also known as a "whim," is located on the site of the former Wheal Uny tin mine and is now derelict. It was likely built in the later 19th century. The structure is made of dressed granite blocks and killas rubble, featuring a bob wall constructed from large granite blocks. The window arches are made of brick, and there is a brick upper stage to the chimney, which is currently roofless.

The building has a rectangular plan oriented on a north-south axis, with the bob wall positioned to the north and the chimney attached at the south-east corner. It consists of three stages, which include round-headed openings, a two-stage window in the bob wall separated by timber beams, a cylinder door in the rear wall, and several square-headed openings in the side walls, including damaged doorways with timber lintels. The tapered cylindrical chimney has a moulded brick cornice at the stone stage, but the top of the brick stage is missing.

This winding engine house is part of a prominent and attractively situated group, visible from the remains of the Basset Mines at Carnkie and Carn Brea.