TheSouth Wales Coalfield (Welsh:Maes glo De Cymru) extends acrossPembrokeshire,Carmarthenshire,Swansea,Neath Port Talbot,Bridgend,Rhondda Cynon Taf,Merthyr Tydfil,Caerphilly,Blaenau Gwent andTorfaen.[1] It is rich incoal deposits, especially in theSouth Wales Valleys.
The area comprises a fully exposedsynclinorium which gave rise to dramatic upland areas (Welsh:mynydd) rising to 300–600 m (980–1,970 ft) above sea level, and intersected by steep-sided valleys in which most of the area's deep mines were developed. Thecoal measures (Upper Carboniferous/Pennsylvanian) are thick, workable seams in the lower parts and generally thinner and sparser seams in the upper parts, with a development ofsandstones (Pennant Sandstone) much used in local construction, (including the characteristicterraced houses).
The coal generally increases in grade or "rank" from east to west, withbituminous coals in the east, andanthracite in the west, mostly to the north and west ofNeath. TheRhondda Valley was particularly known forsteam coals which fuelledsteamships of the 19th and early 20th centuries.
Ways along the valley floors provided the main routes for exporting coal south to ports anddocks such asNewport Docks,Cardiff Docks andBarry Docks.
Early mining activity was mainly by levels oradits driven into coal seams from outcrops in the valley sides. Development of the coalfield proceeded very actively from about 1850, when deep mining became significant in the previously entirely rural Rhondda Valley. Coal was moved from mines on tramways tocanals such as theSwansea Canal andGlamorganshire Canal. These were supplemented, and then superseded, by numerous competingrailways which fed the docks atSwansea,Cardiff,Newport,Llanelli andBarry.
Latercolliery shafts were sunk as deep as 800 yards (730 metres) in order to reach the thicker, better quality seams.
Iron ore was also extracted from the coal measures, principally from the north crop area (includingMerthyr Tydfil andBlaenavon). The availability of coal and nearbylimestone (as a flux) gave rise to a substantial localiron andsteel industry which was perpetuated in the 20th century by the location of modernsteelworks atEbbw Vale, Newport and Cardiff andPort Talbot. These used importediron ore.
Coal fuelling ofRoyal Navy ships was increasingly challenged from 1904 when strategists includingAdmiral "Jacky" Fisher and, later,Winston Churchill successfully argued for oil-firing of the steam engines in new ships.[2][3] Oil, having higher energy density than coal, allowed larger and faster warships, and being easily piped, was easier to supply to ships at sea.
By the start ofWorld War I, both theQueen Elizabeth-class and theRevenge-class battleships were partly oil-fired: oil was used mainly for both quick-start steaming, and sprayed on burning coal to extend their range. A number of cruiser and destroyer classes produced since 1904 also used oil. However, by the time of theBattle of Jutland in May/June 1916 still only a sixth of the Grand Fleet was oil-fired. Further, that summer the British suffered a number of losses of oil tankers, and had to instruct oil-fired ships to restrict their fuel consumption and hence speed. When theUnited States entered the war in April 1917, the British instructed theUnited States Navy to send only coal-fired ships to assist them. To assist the Royal Navy, from the outset of the war the Government and railway companies ran what were termed "Jellicoe Specials", high-speed coal carrying freight trains that ran from South Wales to north-east Scotland, and then by ship toScapa Flow. Initially running toDingwall, they then were also shipped toScrabster throughThurso. However, inadequate capacity in port and rail facilities at these locations meant that from January 1915, all naval ordnance (other than ammunition) and medical supplies were sent by rail toAberdeen, and from mid-1915Grangemouth. By the end of WWI, the Royal Navy had 33 dreadnoughts and 9 battle cruisers, with 10 and 2 respectively entirely oil fuelled.
However, after WWI, the move to oil-firing was quickly extended to other areas, including the railways, which was a key strategic factor in the economic hardship which struck the coalfield after the war. Coal workings were over-expanded in the late nineteenth century,[4] and the Welsh coal owners had failed to invest in mechanisation. By the inter-war period the South Wales Coalfield had the lowest productivity, highest costs and smallest profits in Britain.[5] Hardship continued through the1926 general strike, thegreat depression of the 1930s,World War II and thereafter. The 1937 novelThe Citadel and the 1939 novelHow Green Was My Valley (later filmed, with a wildly inaccurate "colliery village") describe such hardship, as do the poems ofIdris Davies the miner, teacher and poet ofRhymney.
New collieries, particularly in the western part of the coalfield whereanthracite is found, were developed into the 1960s by theNational Coal Board (for instance,Cynheidre Colliery No 1 shaft, at 798 yards (730 m) deep was sunk in 1954/6). Following the general collapse of the UK coal industry, most pits closed during the 1980s, with factors such as exhaustion of reserves and geological complexity adding to their problems. The last deep mine, atTower Colliery on the north crop, ceased mining in January 2008. However, a few small licensed mines continue to work seams, mostly from outcrop, on the hillsides. Although some areas of the coalfield are effectively worked out, considerable reserves remain. However, the geological difficulties, which resulted in the closure of (for instance) Nantgarw colliery, make the cost of significant further extraction high. The coalfield experienced a late-stage development whenopencast mining was commenced on a large scale, mostly on the gently-dipping north crop. In addition, old tips were reclaimed for their small coal content, which could be burned in power stations such as nearby Aberthaw. Most of the old sites have been filled and landscaped, but new operations continue.
Following theAberfan disaster of 1966, when a coal-tip slurry flow buried a school, mine-waste tips, which had been piled precariously on hilltops in many cases, were extensively regraded and reclaimed. This work continues. Landslipping of the steep valley slopes, and subsidence caused by the coal extraction, have also posed problems.
A subsidiary ofWestern Coal (which mainly operates in theBritish Columbia andWest Virginia coalfields), Energybuild plc, worked adrift mine near the old Tower Colliery, theAberpergwm Colliery, until production was suspended in July 2015.[6] The mine produced high qualityanthracite, and was sold primarily toAberthaw power station andPort Talbot Steelworks and into the wholesale and retail sized coal markets. Energybuild also operates theNant y Mynyddopencast coal site nearby.
As the mines and other industries rapidly expanded throughout the coalfield, nearby towns also expanded to meet the demand for labour.[7] In the first half of the nineteenth century, the development of ironworks saw the population ofMerthyr Tydfil, in the northern part of the coalfield, increase from 7,700 in 1801 to 49,794 in 1861, making it the largest town in Wales.[7] As Cardiff and other ports in South Wales grew to meet the demands for exporting iron, steel and coal in the later part of the nineteenth century, valleys that had previously been sparsely inhabited suddenly increased in population. TheRhondda valley grew from less than a thousand people in 1851 to more than 150,000 in 1911.[7]
Between 1881 and 1911,Glamorgan became the most industrialised part of Wales and saw inward migration of more than 330,000 people from elsewhere in Wales, neighbouring parts of England and further afield.[7]
The coal mines were employing 250,000 men by 1921,[8] but this was the peak and in subsequent decades the overseas market began to shrink.[8] By 1930, employment in the mines was half of that in 1920 as mechanisation increased leading to a net loss of 314,000 people between 1921 and 1935.[8]
The South Wales Coalfield was notorious for the number of fatal accidents in the 19th century.[9]
The Risca Black Vein colliery had many fatal accidents to the extent that it became known as the "death pit".[10]
The two biggest accidents at the Black Vein pit were in 1860, when 146 died, and in 1880 when 119 people died.[11]
The Prince of Wales colliery inAbercarn exploded in 1878 causing 268 deaths.[11]
The Llanerch Colliery inAbersychan exploded in 1890 causing 176 deaths.[11]
TheAlbion Colliery inCilfynydd exploded in 1894 causing 276 deaths.[11]
In the 20th century there were numerous further fatal accidents.
The Universal Colliery in Senghenydd had Britain's worst mining accident when it exploded in 1913 killing 431.[12]
In 1966, 116 children and 28 adults were killed inAberfan when a coalspoil tip collapsed onto them.[13]
On 15 September 2011, seven miners were working a narrow seam at the Gleision Colliery drift mine in theTawe Valley, nearSwansea, when a sudden ingress of water filled the passage in which they were working. Three miners were immediately able to escape to the surface. Despite extensive efforts to rescue the remaining miners, on 16 SeptemberSouth Wales Police confirmed that all four had died.[14]
Coal mining in the South Wales Coalfield was a dangerous occupation with lifelong health implications.[15]
Between 1849 and 1853, miners over the age of 25 in theMerthyr Tydfil district were found to have a life expectancy of around 20 years lower than in other mining areas of England and Wales.[16]
In the 1930s, mine owners became concerned about the adversehealth effects of coal dust and the amount it was costing them to compensate miners working at the coalface.[17]Pneumoconiosis proved to be a particular problem for miners in South Wales, accounting for almost 90% of the total cases for the whole of the UK in both 1939 and 1945, and with more than 25% of the South Wales mining labour force affected between 1959 and 1963.[17]
Women in South Wales were often not economically active in the second half of the nineteenth century due to theMines and Collieries Act 1842 which restricted women from underground working.[18] It has been suggested that this explains the lower marriage age and higher fertility of women in the coalfield.[18]
