Engine House, Boilerhouse, Bunker and remains of chimney to south

Sawn squared slate blocks with gable-ended slate roof 3 storeys over basement. Rectangular plan, aligned roughly north-west to south-east. Small-paned sash windows with slate lintels and cills on each face. Entrance in south-east end wall under brick arch approached by sawn slab steps. Large ground-floor opening in north-west end wall, also with brick arch. Remains of clock high up between top-floor windows on north-east wall. Iron beam of engine supported high up on north-west wall and projecting through vertical timber boarding in gable; pair of doors flanking beam open out on to remains of wooded inspection balconies. At the north-west end the shaft head is surrounded by a wall of sawn slate blocks approximately 2m high and attached to the engine house; the shaft head is spanned by 2 steel joists. Against the south-west wall of the engine house are the remains of the boiler house, now roofless but with the principal timbers surviving; it houses the remains of 2 boilers. To the south is the square base of the remote chimney, constructed of sawn slate blocks, approximately 3m high; the former iron extension has been removed.

Access to interior not available at time of survey but noted as retaining its early C20 Cornish beam engine.