Engine House and Attached Chimney Approximately 50 Metres West of Trelane

The engine house and attached chimney, located approximately 50 meters west of Trelane, dates from the mid to late 19th century. It is constructed from roughly coursed slate stone with red brick window dressings and features a slate roof. The building has a rectangular plan and includes a circular chimney covered in ivy at the southwest corner. It stands three storeys tall, with round-headed openings on each floor on the north side, a damaged round-headed opening on the south side, a round-headed opening on the ground floor at the east end, and rectangular openings at the west end.

Inside, the structure retains a stone block for a beam engine, with part of the gearing still present. The roof is scissor-braced and consists of six bays. The site was first mentioned in 1836 as Wheal Martha, later known as the Luckett or New Consols Mine, which experienced various name changes and periods of inactivity until it was renamed New Great Consols in 1867. The mine operated until 1879, focusing on the extraction of copper, silver, tin, and a small amount of gold. It was reopened on a smaller scale in 1946 and remained operational until 1952.