Engine house

Square-plan structure built in the form of a castellated tower. Roughly coursed slate slab construction, formerly with gabled roof concealed by crenellated parapet but roof structure now gone. Entrance on north side through square-headed doorway with round-headed opening directly above. Twin round-headed arches to ground stage on east and west sides (latter now blocked) formerly housed shafts for winding gear. Round-headed openings to upper level on east and south sides (infilled to latter) and twin round-headed openings (also blocked) to upper level on west.

Roofless but wall sockets for joists to former first floor survive, along with extensive lime render below the former gable line. South wall has round-headed fireplace to first floor and another fireplace to ground floor with massive slate lintel.