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Blaencwm (Welsh: Blaen-y-Cwm) is a village in the county borough of Rhondda Cynon Taff, Wales, lying at the head the Rhondda Fawr valley. Blaencwm is very small village and is part of the community of Treherbert.

History
Before the industialisation of the Rhondda, Blaencwm was a forested agricultural and rural area. There is evidence in the area of Mesolithic and Neolithic human activity, mainly through the discovery of basic hunting, foraging and tool making items. Blanecwm is also the site of three ruinous 16th century hafotai (summer houses ; Welsh language hafod), small agricultural dwellings discovered on the north-east slope of the village. Of all the hafotai discovered in the Rhondda the most important is Lluest discovered in Blaencwm and proof of the agricultural history of the area.

In the 19th century with the coming of the Taff Vale Railway, coal mines began opening in the upper Rhondda Fawr. Two mines were sunk in Blaencwm, the first was the Dunraven Colliery opened by Thomas Joseph's Dunraven United Collieries in 1865. The business went in liquidation in 1866 and was taken over by Watts and Company in 1872. Between then and 1913 when it was purchased again, this time by the Cory Brothers, it changed its name to Tydraw Colliery. It closed in 1956. The second colliery, Glen Rhondda, was opened in 1911 by Glenavon Garw Collieries. The mine was served by the Rhondda and Swansea Bay Railway which would travel through the Rhondda Tunnel. This pit was closed by the National Coal Board in 1966.