Former Lewis Merthyr Colliery Trefor pithead and headframe

A stone and brick pitbank covered by a wrought iron trussed corrugated roof through which rises a lattice girder headframe. Pitbank formed of plinth of rubble and rockfaced sandstone with irregular openings and arches to service tunnels, and curving sides of fan passage leading from shaft to fan house on E side. Parts of superstructure above pit bank are of brick, some new, but cover building is largely of corrugated iron on a wrought iron frame, typical of collieries of this period. Airlock doors and heavy wooden guillotine gates and knocking irons still in situ. Headframe rising through roof is of wrought iron lattice girder type with 4 splayed legs over shaft and 2 sweeping supports from the axle of the sheaves to stone plinths butting N wall of adjacent winding engine house; these connected to legs by diagonal braces. Maintenance platform surrounds sheaves with access by ladder up SW leg. Interior of headframe contains later steel plate air lock.

Interior of headframe contains later steel plate air lock.