Denbighshire Coalfield

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The Denbighshire Coalfield in the county of Denbighshire in north-east Wales is one of the smaller British coalfields. It extends from near Caergwrle in the north, southwards through Wrexham, Ruabon and Rhosllannerchrugog to Chirk in the south. A small part extends into Shropshire around Oswestry. Beyond Caergwrle the coal-bearing strata continue northwards as the Flintshire Coalfield. Together the two coalfields are known as the North Wales Coalfield. [1]

Contents

History

The shallower parts of the Denbighshire Coalfield were worked extensively in the early nineteenth century, most of the coal being used in the iron industry. In the mid-nineteenth century, much deeper pits were established and a network of railways was built in the Wrexham area to transport the coal. [2]

A report on the North Wales Coalfield in the 1950s found that the reserves of coal were running low and that in the Denbighshire Coalfield, the geology of the coal-bearing strata dipped rapidly rendering it unlikely that the coalfield could be further developed. [1] The last deep mine to operate in the coalfield was Bersham Colliery which closed in 1986. Prior to this time, as many as 38 collieries had been in operation across the area, with a peak output in excess of 2.6 million tons, and giving employment at the height of production to some 12,000 men. [3]

Coal seams

Several coal seams are named in the sequence. All of the seams occur within the Bettisfield Formation with the exception of the Morlas which occurs in the Coed-yr-Allt Formation. The seams are listed stratigraphically with the uppermost (youngest) at the head of the list and the lowermost (oldest) at the foot. [4]

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Manchester Coalfield

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North Wales Coalfield

The North Wales Coalfield comprises the Flintshire Coalfield in the north and the Denbighshire Coalfield in the south. It extends from Point of Ayr in the north, through the Wrexham area to Oswestry in Shropshire in the south. A much smaller area on Anglesey where coal was formerly mined is not usually considered to form a part of the coalfield, although it is geographically in the North Wales region.

Bristol Coalfield coal mining region in the west of England

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Coal measures

The coal measures is a lithostratigraphical term for the coal-bearing part of the Upper Carboniferous System. In the United Kingdom, the Coal Measures Group consists of the Upper Coal Measures Formation, the Middle Coal Measures Formation and the Lower Coal Measures Formation. The group records the deposition of fluvio-deltaic sediments which consists mainly of clastic rocks interstratified with the beds of coal. In most places, the coal measures are underlain by coarser clastic sequences known as Millstone Grit, of Namurian age. The top of the coal measures may be marked by an unconformity, the overlying rocks being Permian or later in age. In some parts of Britain, however, the Coal Measures grade up into mainly coal-barren red beds of late Westphalian and possibly Stephanian age. Within the Pennine Basin these barren measures are now referred to as the Warwickshire Group, from the district where they achieve their thickest development.

Bersham Colliery

Bersham Colliery was a large coal mine located near Rhostyllen in Wrexham County Borough, Wales. The mine accessed seams found in the Denbighshire Coalfield.

The North Wales Miners' Association was a trade union representing coal miners in Wales.

Coal industry in Wales

The coal industry in Wales has played an important role in the Industrial Revolution in Wales. Coal mining expanded in the eighteenth century to provide fuel for the blast furnaces of the iron and copper industries that were expanding in southern Wales. The industry had reached large proportions by the end of that century, and then further expanded to supply steam-coal for the steam vessels that were beginning to trade around the world. The Cardiff Coal Exchange set the world price for steam-coal and Cardiff became a major coal-exporting port. The South Wales Coalfield was at its peak in 1913 and was one of the largest coalfields in the world. It remained the largest coalfield in Britain until 1925. The supply of coal dwindled, and pits closed in spite of a UK-wide strike against closures. The last deep mine in Wales, Tower Colliery, closed in 2008, after thirteen years as a co-operative owned by its miners.

References

  1. 1 2 "Mines of the North Wales Coalfield". North Wales Miners Association Trust Ltd. Retrieved 25 April 2016.
  2. Royle, Edward (1998). Issues of Regional Identity: In Honour of John Marshall. Manchester University Press. pp. 210–213. ISBN   978-0-7190-5028-2.
  3. WCBC: Bersham Colliery Mining Museum
  4. "Bedrock Geology: UK South, 1:625,000 scale geological map (5th edn)". British Geological Survey. 2007.Missing or empty |url= (help)

Coordinates: 53°03′03″N3°00′34″W / 53.0507°N 3.0094°W / 53.0507; -3.0094