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| Pembrokeshire Coalfield | |
|---|---|
| Name | Pembrokeshire Coalfield |
| Location | Pembrokeshire, Wales |
| Geology | Coal measures, Carboniferous |
| Period | Carboniferous |
| Area | West Wales |
Pembrokeshire Coalfield is a small Carboniferous coal-bearing area in West Wales located within Pembrokeshire near Milford Haven, Haverfordwest and Pembroke Dock. The deposit lies within the broader geological context of the Welsh Basin, the Variscan orogeny-modified landscape and the regional succession that also includes the South Wales Coalfield and the Powys coal-bearing sequences. Iterations of exploration, extraction and community change link to industrial centers such as Cardiff Docks, Swansea, Newport, Wales and transport routes like the South Wales Railway and Great Western Railway.
The coalfield comprises Carboniferous Pennsylvanian stratigraphy with interbedded sandstones, mudstones and coal seams within the Coal Measures Group influenced by Variscan folding and faulting adjacent to the St Davids Peninsula and the Preseli Hills. Its seams occur with local equivalents to seams in the South Wales Coalfield and are spatially associated with outcrops near Amroth, Tenby, Pembroke, Milford Haven and the Daugleddau estuary. Structural controls include numerous normal and reverse faults similar to those mapped in the Bristol Channel Basin and features comparable to the Northern Ireland Coalfield and the Forest of Dean. Coal rank is generally bituminous with variations reflecting burial and thermal history like those seen in the Bannockburn and Fife districts.
Commercial exploitation dates from the late medieval period and intensifies during the Industrial Revolution when demand from ironworks in Merthyr Tydfil, Neath and maritime fuel needs at Pembroke Dockyard rose. Nineteenth-century investment and technology transfer involved agents and entrepreneurs linked to South Wales ironmasters, shipping at Milford Haven Port, and capital flows through financial centers such as the City of London. Local mines were affected by national events including the Rebecca Riots, the Chartist movement and labour actions related to the Miners' Federation of Great Britain and later the National Union of Mineworkers (Great Britain). Decline began in the late 19th and early 20th centuries with competition from larger basins, the impact of the Great Depression, wartime reorganization during World War I and World War II, and postwar nationalisation under the Coal Industry Nationalisation Act 1946.
Early adits and bell pits echoed medieval methods seen in Staffordshire and South Yorkshire while later workings adopted shaft sinking, room-and-pillar and longwall techniques as used in the South Wales Coalfield and Derbyshire collieries. Steam-powered pumping and winding engines influenced by designs from Boulton and Watt and Robert Stephenson enabled deeper mining similar to practices in Yorkshire. Ventilation, gas management and safety practices evolved alongside legislation such as the Mines Regulation Act 1872 and the Coal Mines Regulation Act 1872 with local implementation reflecting inquiries like the Royal Commission on Accidents in Mines (1877). Working conditions paralleled those recorded in reports from the Royal Commission on the Coal Industry (1919) and in union archives of the British Miners' Association.
Key localities included small-scale pits and shafts around Milford Haven, Pembroke Dock, St Ishmaels, Amroth, Angle and Brunel’s transport corridors. Notable operations historically connected to regional trade were sited to serve naval facilities at Pembroke Dockyard, shipbuilding in Swansea and export through Haverfordwest and Fishguard. Connections with tramways, inclines and later branch lines linked pits to ports similar to the networks of the Cambrian Railways and the Great Western Railway in west Wales. Collieries shared characteristics with workings documented in the Burry Port and Kidwelly complexes.
Coal extraction shaped settlement patterns around villages and towns such as Milford Haven, Pembroke, Tenby and Haverfordwest by providing employment and fostering ancillary trades linked to ship chandlery, ironworking and coastal shipping that also involved agents from Liverpool, Bristol and London. The industry influenced demographic shifts, housing typologies, and social institutions mirrored in studies of South Wales mining communities and trade unionism associated with the Trades Union Congress. Economic volatility tied to prices in London Coal Exchange and wartime shipping losses during Battle of the Atlantic created cycles of boom and bust, migration to industrial centres like Cardiff and cultural expressions comparable to those recorded in Welsh coalfield communities.
Mining left a legacy of spoil heaps, subsidence and altered drainage impacting estuarine systems such as the Pembroke River and the Daugleddau. Tailings, acidification and landscape scarring resemble impacts observed in the Clydach Vale and the Taff Valley. Post-mining land use included reclamation, agriculture, forestry and conversion to infrastructure analogous to former collieries repurposed in projects by the National Park Authority and local planning authorities like Pembrokeshire Coast National Park Authority. Coastal quarries and mine adits interact with conservation interests such as Natural Resources Wales and heritage designations involving Cadw and local museums.
Remnants of shafts, engine houses and tramway earthworks are interpreted alongside maritime heritage at Milford Haven Museum, Pembrokeshire Coast National Park visitor services and community archives linked to organizations such as the National Coal Museum-style initiatives and local history societies. Heritage trails incorporate sites comparable to interpretive routes in Blaenavon and Big Pit National Coal Museum, integrating storytelling, industrial archaeology and amenities promoted by bodies like Visit Wales and local councils. Conservation balances public access, safety remediation and commemoration of labour history through exhibitions, oral histories and listed structures overseen by Cadw and local civic trusts.
Category:Coal mining in Wales Category:Geology of Pembrokeshire