Merthyrdare, Merthyr-Dare or Merthyr Dare Colliery (nprn 85004) is in Cwmdare, 2 km west of Aberdare, and dates from before 1851. Around 1906 it seems the mine was resusitated, having been closed, and a new winder house built. T-shaped in plan, the winder house has a plaque on its northern gable bearing the legend '1906' and 'Bwllfa Collieries'. By 1948 the mine was again shown as disused on the Ordnance Survey 25in mapping; the whole site was demolished and landscaped in the early 1970s, forming part of the Dare Valley Country Park.
(See also: NMR site file Glamorgan/Industrial/SN90SE: Council for British Archaeology Industrial Archaeology Report Card of 15 July 1965)
B.A.Malaws, RCAHMW, 27 January 2009.