Consolidated Mines, Engine House

The Consolidated Mines Engine House is a ruin of a beam engine house dating from the early 19th century. It is constructed from killas rubble, featuring granite voussoirs, some jambstones, and a lintel on the ground floor to the east, while the rest of the structure uses wooden lintels and wooden bearing pads for the floors. The building has a rectangular plan with a thicker bob wall on the north side, which still stands to a full two-floor height and was originally topped with a timber-studded gable. The south wall is partly built into a bank and has mostly collapsed, while the west wall is half fallen. The east wall remains at the north end, reaching three floors high, with one ground floor window on the right and two first-floor windows on the left, although the left window is blocked.

The bob wall features an arched opening on the ground floor, with dressed granite jambstones and voussoirs. The doorway is designed for load bearing, with the outer half being narrower and having a segmental arch with a projecting keystone, while the inner half has a complete round-headed arch. Timber floor bearing pads are present above.

There is a detached chimney to the south at a higher level, which is a separate item. This engine house was part of the Consols Mine, known as Cornwall's most productive mine in the early 19th century. Between 1823 and 1825, the Consolidated Mines accounted for 12.5% of the total copper production in Great Britain and 15-25% of the total in Cornwall.