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252 mines beginning with G, of 3568.

Mine	Region	Worked	Commodities
Gadair Wyllt Slate Quarry A small Rhyd Ddu slate quarry above Llyn y Gader, stopped and restarted through the First World War, whose waste was tipped into the lake.	Gwynedd	c. 1885–c. 1920	Slate
Gadlys Colliery The Wayne family's ironworks colliery at Aberdare, one of the Cynon Valley's first pits and one of its most dangerous.	Rhondda Cynon Taf	c. 1802 (by 1844 by one account)–1902	Coal, Ironstone
Gaewern Quarry Its wrought-iron fishbelly T-section tramway rail, a design rarely used inside a quarry's own internal system, still survived on site as of the early 1990s survey.	Gwynedd	1787–From 1884	Slate
Galawhistle Pit A Glenbuck pit where a father was killed by a roof fall that injured two of his sons beside him.	East Ayrshire	by 1884	Coal
Gallt y Fedw Slate Quarry A small Nantlle slate quarry beside Dorothea, developed in the 1850s with saw tables working in the open air, that lasted until 1930.	Gwynedd	1850s–1930	Slate
Gang Mine Its own name comes from 'gangue', the waste rock dumped around its shafts -- ground so lead-contaminated that it now supports one of Europe's rarest plant communities.	Derbyshire	by 1652	Lead
Gannow Colliery Burnley's canal-side pit of 1856 whose 229-metre shaft cost years and lives to sink, and which wound Habergham's coal for sixty years after its own seams were done.	Lancashire	1856–1941	Coal
Gardrum Colliery A Falkirk pit that fed the Carron ironworks, whose Victorian accident reports survive in the Falkirk Herald.	Falkirk	By 1854–18 September 1920	Coal, Ironstone
Garesfield Colliery A Bute estate colliery begun in 1800, served by a wagonway George Stephenson redesigned, and later the core of the Consett Iron Company's Derwent coal.	Tyne and Wear	1800–29 January 1960	Coal, Fireclay
Garn Colliery, Blaenavon The Blaenavon ironworks' Garn pit of about 1839, with its unusual line-in winding gear, and the Garn Slope that kept the colliery working into the 1960s.	Torfaen	c. 1839–1963 or 1966	Coal, Ironstone
Garn Colliery, Nantyglo Owned by Sylvanus Jones, who ran several small Nantyglo pits without joining the coal owners' association — he was declared bankrupt in 1925.	Blaenau Gwent	by 1896	Coal
Garnant Colliery Ten men in a cage meant for eight, the rope snapped, and they fell 225 feet — the worst disaster the Amman Valley has had.	Carmarthenshire	to 1912	Coal
Garngoch Colliery Glasbrook Brothers' three connected Gorseinon pits, the last of them closed by the Coal Board in 1965.	Swansea	c. 1870 (No. 1 pit)–1965 (No. 3 pit)	Coal
Garrallan Colliery A small Cumnock pit that passed through five companies and reached the House of Lords in 1924 over a bottomer's death at the shaft.	East Ayrshire	c. 1907–1960	Coal, Fireclay
Garreg Fawr Iron Mine A Moel Eilio ironstone mine that sent its ore over the mountain to Llanberis by a 4.7 km aerial ropeway.	Gwynedd	1840s–1920	Iron, Copper
Garreg Fawr Slate Quarry A tiny Gwyrfai slate quarry remembered for its toy-castle tower above the Welsh Highland Railway.	Gwynedd	c. 1802–1930s	Slate
Garriongill Colliery A Coltness Iron Company colliery near Overtown where donkeys hauled hutches and the general manager himself was burned by firedamp.	North Lanarkshire	By 1871–1932	Coal
Garscube Colliery Its site, once two deep shafts over 100 metres down, now lies buried beneath ordinary parkland.	North Lanarkshire	Around 1850–1966 (closure)	Coal
Garswood Hall Colliery Its No. 9 shaft exploded while being sunk in 1902, again in 1932, and once more while it was being filled in.	Greater Manchester	By 1902–1932 (No. 9 Pit)	Coal
Garswood Park Colliery Two explosions fifteen months apart killed thirty, and the second began as the veteran fireman went to fire a shot.	Merseyside	by 1862	Coal
Garth Colliery, Tonmawr A small Tonmawr colliery that opened one of the South Wales coalfield's first pithead canteens in 1942.	Neath Port Talbot	By 1917–20 June 1964	Coal
Garth Merthyr Colliery A hitcher's miscount in 1897 put one man off the cage that fell, and he was so offended that he refused to get back in.	Bridgend	1865–1930	Coal
Gartheiniog Quarry Passed through at least seven distinct ownerships in under sixty years -- including a failed post-war housing venture and a fighter pilot's short-lived attempt to add an enamelling works -- rarely staying profitable for long under any of them.	Gwynedd	1873 (exploration)–October 1937	Slate
Garths Ness Mine Workmen hid copper pennies in the assay samples to keep the Laird of Quendale paying for a mine whose ore was mostly iron.	Shetland Islands	c. 1800–1920s	Copper, Iron
Gartshore Colliery A pit bottomer named Andrew Airlie, thrown against a wall by the 1923 explosion, climbed back underground himself to help pull out the injured rather than wait for a rescue team.	East Dunbartonshire	From c. 1860–1968 (last pit, Gartshore 9/11)	Coal
Garw Colliery The Ocean company's Garw pit, merged underground with Ffaldau in 1975 and the last mine in the valley to close, in December 1985.	Bridgend	From 1883 (sinking)–December 1985	Coal
Gascoigne Wood Mine Every tonne from five pits came up here, on more than 25 km of belting — the longest mine conveyor network in Europe, and the complex's single point of failure.	North Yorkshire	1983–2004	Coal
Gasswater Mine Known since the 1870s, left alone until 1917, and then for a time the largest producer of barytes in the United Kingdom.	East Ayrshire	From 1870s–1963	Barite
Gate Crag Quarry Eight people still on the books in 1930 at a Borrowdale slate quarry the return records as already suspended.	Cumbria	Working by 1929–1929	Slate
Gatewen Colliery It was not worked out; it simply ran out of room. Its headgear went to Bersham and kept working.	Wrexham	1877–1932	Coal
Gatherick Colliery A small north Northumberland colliery with roots in the 1600s, whose 1819 shaft section survives.	Northumberland	Late 17th century–1865	Coal
Gatten Mine Worked down a pink vein of baryte to about 200 metres, then given up in the 1940s not because the ore ran out but because the mine was too remote.	Shropshire	c. 1887–1945	Barite
Gauchalland Colliery One of fifteen pits around Galston at the century’s end, and the one whose rows of company houses were written up in detail by a royal commission in 1913.	East Ayrshire	By 1880–early 20th century	Coal
Gautries Rake Its dressing floor holds the only known stone-lined buddle anywhere in the northern half of the Derbyshire orefield.	Derbyshire	from Working by 1671	Lead
Gaverigan Tin Streaming Produced 'sparable tin', a variety of cassiterite named for its resemblance to a cobbler's nail.	Cornwall	by 1873	Tin
Gavieside No. 11 Pit One of Young's oldest and largest shale pits, where four boys and young men fell to their deaths in 1885.	West Lothian	c. 1867–1901	Oil Shale, Coal
Gavieside No. 40 Mine A West Calder shale mine on a seam up to sixteen feet thick, near the Five Sisters bings.	West Lothian	About 1902–1927	Oil Shale
Gawton Mine Historic England rates it the best-preserved arsenic mine, calciner and flue complex of its type in the country.	Devon	Before 1846–1902–03 (arsenic works)	Arsenic, Copper
Gedling Colliery A Nottinghamshire colliery known from the 1950s as the 'Pit of Nations' for its unusually diverse workforce, now Gedling Country Park.	Nottinghamshire	1899–1902–8 November 1991	Coal
Geevor Tin Mine One of the last working Cornish tin mines; now a museum	Cornwall	1911–1990	Tin, Copper
Gelli Colliery Two pits on one site shared a single run of numbered wage tickets, and in 1882 four colliers worked out how to cash other men's.	Rhondda Cynon Taf	1870–13 January 1962	Coal
Gelli Nedd Colliery A tiny Pontardawe level, never more than seventeen men, where a young collier died after being run down by trams in 1906.	Neath Port Talbot	By 1893–after 1911	Coal
Gellideg Colliery The Gellideg No.2 level fed the Cyfarthfa Iron Works, abandoned in March 1924.	Merthyr Tydfil	to March 1924	Coal
Gelligaer Colliery The 1828 level where Thomas Powell began the career that built Powell Duffryn, later worked with Llancaiach until both closed in 1887.	Caerphilly	1828–May 1887	Coal
Gelligroes Colliery A Sirhowy valley pit begun beside Gelligroes mill in 1874 and attempted three times in forty-five years, defeated first by water and then by war.	Caerphilly	1840s–1918	Coal
Gellyceidrim Colliery An Amman valley anthracite pit working the Peacock seam, closed in 1957 so that its men could be moved to Pantyffynnon down the valley.	Carmarthenshire	By 1905–1957	Anthracite
Gem Mine A little Walkham tin mine whose engine shaft was christened Lucy's with strong beer in 1871 and filled with Brunel's viaduct stone in 1965.	Devon	1855–1874	Tin
Gentlemen Colliers A Forest of Dean gale worked by free miners since at least 1735, whose most famous partner told a prospective buyer flatly that he had never got anything by it.	Gloucestershire	By 1735–c. 1900	Coal
Gentlewoman's Pipe A lead mine near Matlock Bridge, named in Benjamin Bryan's list of Matlock lead mines working in 1807-09.	Derbyshire	from Working by 1807-09	Lead
Genwen Colliery Chauncey Townsend's Llwynhendy Fire Engine Pit of 1766, with a listed engine house, closed by a 1907 explosion that killed four miners and two rescuers.	Carmarthenshire	1766–1907 (flooded 1908)	Coal
George and Charlotte Copper Mine Named for George III and Queen Charlotte, and now entered on a battery train 460 metres into the Deep Adit	Devon	18th century–1869	Copper, Pyrite
George Pit A short-lived Powell Duffryn pit high above Cwmpennar, reached by an incline on which five men riding forbidden wagons were killed in 1886.	Rhondda Cynon Taf	1881 (sinking)–1905 or 1909	Coal
Gerards Bridge Colliery An early St Helens pit by the canal where a father and four sons died together in the 1847 explosion.	Merseyside	By 1805–1870s (last listed 1873)	Coal
Gethin Colliery Its manager was found responsible for two explosions sixteen years apart and prosecuted for neither	Merthyr Tydfil	1849–1920s (production)	Coal
Giants Hall Colliery A Standish pit whose No. 1 shaft dated from the early 1800s, deepened by Wigan Coal & Iron into a 600-yard colliery that wound coal into the 1960s.	Greater Manchester	Early 1800s–January 1961	Coal
Gibfield Colliery Britain's first purpose-built colliery pithead baths were built here in 1913 — the building still stands today, just fixing cars instead of washing miners.	Greater Manchester	1829–1963	Coal
Gidlow Colliery A Wigan Coal and Iron pit whose shafts outlived its coal by over twenty years as a pumping station.	Greater Manchester	1857 (sinking)–1910 (production)	Coal
Giew Mine For a short time in the early 1920s, the only working mine in Cornwall.	Cornwall	Mid 18th century–1923	Tin
Giffnock Colliery A colliery on the edge of a Glasgow commuter suburb whose coal was too poor for the domestic grate and went to the gasworks instead.	Renfrewshire	c. 1850–c. 1926	Coal, Fireclay, Ironstone
Gilbertfield Colliery Cambuslang's 'slaughter house' pit, whose miners pulled their way to a national tug-of-war title.	South Lanarkshire	1880 (sinking)–1919	Coal
Gilfach Colliery A Rhymney Iron Company colliery near Bargoed, sunk through heavy water to the Brithdir seam in 1887-91 and latterly kept only as a pumping station.	Caerphilly	1887-1891 (sinking)–1931 (pumping to 1947)	Coal
Gill Force Mine A short-lived iron venture whose railway branch became the last stretch of today's Ravenglass and Eskdale Railway.	Cumbria	1880–by 1884	Iron
Gillers Green Colliery An Eccleston colliery sunk in the 1870s whose sinking pit claimed three lives in 1875, closed in 1883.	Merseyside	1873 (sinking)–1883	Coal
Gillfoot Park Mine One of six haematite pits sunk on a single Egremont property, and a noted source of 'butterfly'-twinned calcite alongside its iron ore.	Cumbria	1879–1915	Iron
Gillhead Colliery A pit that employed under fifty men for sixty years, then quadrupled during the war and closed in 1959 at 140 — and sold ganister and fireclay for as long as it sold coal.	Cumbria	By 1860s–1959	Coal, Fireclay, Ganister
Gillow Slate Quarry Worked from sea level to clifftop below Tintagel church, and gone from the Ordnance Survey between 1884 and 1896.	Cornwall	Possibly from the 17th century–by 1896	Slate
Gilmerton Colliery Three centuries of edge-coal mining on Edinburgh's doorstep, ended by a fire that sealed the pit for good.	Midlothian	1627 (first record)–1961 (abandoned 1963)	Coal
Gilmilnscroft Colliery An estate colliery between Sorn and Auchinleck, shown on a map of 1828 and still working for William Baird in the 1920s.	East Ayrshire	By 1828–c. 1925	Coal
Gilwen Colliery Sunk by an ironworks in 1860 and reached by its own locomotives over the hillside, it outlived the ironworks to employ 400 men in the 1920s.	Neath Port Talbot	from 1860	Coal
Gin Pit Colliery Named after winding gear from an even older colliery on the same spot — its own workers' village still stands, now with a pit wheel borrowed from a completely different Nottinghamshire mine as its memorial.	Greater Manchester	1840s–1958	Coal
Gin Pit, Maesteg The Llynvi Iron Company's pit on its Maesteg ironworks site, scene of the district's worst mining accident, on Boxing Day 1863.	Bridgend	Probably early 1840s–1875	Coal, Ironstone
Glaisdale Ironstone Mine A village built on ironstone that was seventy metres deeper than expected, and a tramway that went up and over a moor rather than round it.	North Yorkshire	Mid-1860s–1876	Ironstone
Glamorgan Colliery Its 1905 engine house is one of the very few substantial colliery buildings still standing anywhere in the Rhondda Valley, most having been demolished after closure.	Rhondda Cynon Taf	1861–1945	Coal, Fireclay
Glanamman Colliery A shaft that employed seven men in 1907 grew to over two hundred under a one-colliery company, only to be among the first pits the new National Coal Board shut.	Carmarthenshire	By 1898–31 January 1948	Coal
Glanddu Colliery A Pengam level shared by several coal owners, none of whom inspected its road, until a five-ton stone killed two men in 1875.	Caerphilly	By 1842–June 1931	Coal
Glanmwrwg Colliery An inrush from old workings in December 1899 drowned one collier and left another hanging on to a collar for eleven hours; three of his rescuers were given Royal Humane Society medals.	Carmarthenshire	by 1872	Coal
Glanrafon Quarry The Cwm Gwyrfai slate quarry that brought the North Wales Narrow Gauge Railway to Rhyd Ddu, its flooded pit now beside the Welsh Highland line.	Gwynedd	By 1875–c. 1916	Slate
Glapwell Colliery A Sheepbridge Top Hard pit whose village grew from eighteen houses to nearly five hundred.	Derbyshire	11 August 1882–1974	Coal
Glascote Colliery A Tamworth colliery and clay works recorded from 1850, which worked coal, ironstone and fireclay from the same measures until its coal seams were abandoned in 1943.	Staffordshire	By 1850–1943	Coal, Fireclay
Glasdir Mine Glasdir's real legacy has nothing to do with how much copper it actually produced — it's that the ore-separation technique proven here in 1897 became the direct ancestor of froth flotation, the process still used to concentrate the great majority of the world's metal ores today.	Gwynedd	From c. 1852 (surface)–1915	Copper, Silver, Gold
Glasgow Caradon Consols A Cornish copper mine financed from Glasgow, whose shares rose fivefold when it struck copper in 1863.	Cornwall	from 1860	Copper
Glasshoughton Colliery Its 1931 pit-head baths, built for over 3,000 men, were the largest scheme of their kind anywhere in the country — the first miners in West Yorkshire to wash off a shift's coal dust before going home.	West Yorkshire	1865 (sinking)–March 1986	Coal
Glasshouse Colliery A Chesterton colliery named after an eighteenth-century glasshouse, worked by footrails into the 1960s.	Staffordshire	c.1855–December 1960	Coal, Ironstone
Glebe Mine A small Eyam lead pit that closed in 1884 gave its name to Glebe Mines Ltd, which went on to become one of Derbyshire's major 20th-century fluorspar producers, surviving corporate changes through Laporte ownership and a 21st-century Italian takeover before finally closing in 2010.	Derbyshire	From 1860s–1884	Lead, Fluorspar
Gleision Colliery One of the last handful of working coal mines in South Wales when a blast breached flooded workings in 2011, killing four of the seven miners underground -- the worst Welsh mining disaster in three decades.	Neath Port Talbot	1962–2011	Coal
Glen Rushen Mines Mining began after a hay cart's wheel accidentally uncovered a lump of lead on the cart track through the glen.	Isle of Man	1831–1879	Lead, Zinc
Glenariff Iron Ore Mines Ore from the Cloghcorr and Parkmore workings ran down Ireland's first 3ft-narrow-gauge railway to Red Bay Pier for export to Scottish and English ironworks.	County Antrim	1873–1881	Iron
Glenavon Colliery 'The Squint', a drift mine at Croeserw in the Afan valley opened in 1899, where five men drowned in an inrush in 1900.	Neath Port Talbot	1899–after 1945	Coal
Glenboig Fireclay Mines A clay so free of iron and lime that its bricks would not crack — a quarter of a million a day, and a million a year to Germany, Russia and Belgium	North Lanarkshire	1830s–1956	Fireclay
Glenbuck Colliery A now-vanished Ayrshire mining village that produced 50 professional footballers in 50 years, including Liverpool manager Bill Shankly, whose four older brothers all played for the village's own junior side.	East Ayrshire	From 1795–1933	Coal
Glencairn Colliery A small 1930s drift colliery near Longniddry that kept working for the National Coal Board until 1962.	East Lothian	1936–January 1962	Coal
Glenchass Mine A minor Manx copper mine near Port St Mary, alongside Bradda and Foxdale.	Isle of Man	Before 1800 (probable)–1865	Copper
Glenclelland Colliery A Wishaw colliery worked for some eighty years, from about 1850, that raised oil shale and ironstone with its coal.	North Lanarkshire	By 1850–1930	Coal, Oil Shale, Ironstone
Glencraig Colliery A colliery whose 1933 fatal accident became one of the most-cited cases in UK employment law.	Fife	c.1895–1966	Coal
Glendinning (Louisa) Mine A remote Scottish valley was, for a few short years in the 1790s, the source of Britain's entire domestic antimony supply.	Dumfries and Galloway	1788–1922	Antimony
Glendon Ironstone Quarries Part of the Northampton Sand ironstone belt worked for the Midlands iron industry.	Northamptonshire	1863–31 December 1979	Iron
Glenesk Colliery A short-lived Dalkeith colliery beside the old Edinburgh and Dalkeith Railway, worked for only about seven years.	Midlothian	c. 1898–by 1905	Coal
Glengarw Colliery A Garw valley colliery that worked a seam formed where two others merge, and kept its Australian gold-rush nickname, the Ballarat.	Bridgend	1890s–1959	Coal
Glengonnar Glengonnar's gold rush left behind spoil heaps still known locally as 'gowd scaurs' four centuries later — a folk name for the alluvial workings that has outlasted almost everything else remembered about the gold itself.	South Lanarkshire	1239–1940	Lead, Silver, Gold
Glenhafod Colliery A Port Talbot drift colliery of the 1920s that worked out its seams under the National Coal Board in 1958.	Neath Port Talbot	1920s–28 November 1958	Coal
Glenochil Colliery A 1950s Coal Board mine planned for fifty years that closed after six, its site now a prison.	Clackmannanshire	1952–1962	Coal
Glenravel Iron and Bauxite Mines The same rock was worked twice for two entirely different minerals — iron in the Victorian boom, then bauxite when Britain needed aluminium for Spitfires	County Antrim	From 1866–31 December 1945 (final bauxite closure)	Iron, Bauxite
Glenrhondda Colliery The colliery's own workforce started a drum-and-fife band in 1897 that outlived the pit itself by decades, still performing today as the Treherbert & District Band (see Culture, below).	Rhondda Cynon Taf	1911–1966	Coal
Glensanda Quarry A quarry with no road, hidden inside a mountain: the granite drops 300 m down a shaft and travels a mile by conveyor to reach the ships.	Highland	1986–Still active	Granite
Glentaggart Colliery No baths, no washer, and a canteen four miles away in the village for men to eat their packed pieces in.	South Lanarkshire	1943–1969	Coal
Gloddfa Ganol Quarry For 24 years its underground galleries housed one of Britain's great private narrow-gauge locomotive collections -- over 80 engines gathered from industrial railways across Britain and Europe -- rather than slate.	Gwynedd	to 1997	Slate
Gloria Colliery, Hartley Sunk in 1935 to reach coal trapped behind a horseshoe-shaped fault, and closed barely fifteen years later.	Northumberland	1935 (sinking)–1 June 1951	Coal
Gloucester Furnace, Lamberhurst The largest Wealden ironworks of its kind, whose furnace cast the great iron railings and gates around St Paul's Cathedral churchyard in 1710.	Kent	1548–1787	Iron
Glyn Colliery, Tonyrefail Grew to 359 men by 1901 working the No.2 and No.3 Rhondda seams, before abandonment in 1903.	Rhondda Cynon Taf	1878–1903	Coal
Glyn Merthyr Colliery In this part of the Vale of Neath the valley floor was too disturbed for a deep pit, so every colliery, Glyn Merthyr among them, was driven as a slant into the hillside outcrop.	Neath Port Talbot	from 1913	Coal
Glyn Neath Colliery A 24-year-old screens worker, M.S. George, was killed after becoming entangled in machinery here in August 1927.	Neath Port Talbot	by 1923	Coal
Glyn Pits, Pontypool A Pontypool hillside colliery whose 1845 beam engine and flat-rope vertical winding engine still stand in their engine houses.	Torfaen	Early 1840s (Balance Pit 1830s)–1932	Coal
Glyn-nant-ddu Colliery An early shaft above Abersychan that may still have wound its coal by water power around 1880, unusually late for the district.	Torfaen	Before 1830–May 1904	Coal
Glyncastle Colliery Its owners sank shafts because their levels found only soft coal, then found the deeper seams soft too, and a thick clod above the next one fouled every ton.	Neath Port Talbot	From 1837–3 April 1965	Coal
Glyncorrwg Colliery The Afan valley pit where a 1954 explosion caused by aluminium striking rusty steel got aluminium banned from British coalfaces.	Neath Port Talbot	1904–1970	Coal
Glyncymmer Colliery An Afan valley level the village called 'Goodie', run for twenty years by one manager and worked until nationalisation.	Neath Port Talbot	By 1896–January 1947	Coal
Glyndyle Graigola Colliery A 1920s-30s Trebanos level known locally as Five Boys, worked by a handful of men.	Neath Port Talbot	1925–1936 (Graigola abandoned)	Coal
Glynea Colliery A gassy Llanelli-district pit of thirteen explosions, where a blown-out shot killed eight men days after Senghenydd.	Carmarthenshire	1861-63–1926	Coal
Glynfach Colliery A small Porth pit sunk in 1851 that changed hands three times before its last owners failed in 1881, a year before it closed.	Rhondda Cynon Taf	1851–1882	Coal
Glyngwyn Colliery Nixon's Navigation's house-coal level at Miskin, opened in 1885 and worked for forty years.	Rhondda Cynon Taf	1885–December 1925	Coal
Glynhebog Colliery A Gwendraeth anthracite slant free of outbursts but deadly with dust, whose drift lived on as part of Cynheidre until 1989.	Carmarthenshire	1892–1989 (as Cynheidre No. 3 slant)	Anthracite
Glynmoch Colliery A Victorian level abandoned in 1883 that was pumped out and reopened as Ystrad in 1949, and kept working through eight changes of owner until 2000.	Carmarthenshire	By 1853–31 May 2000	Coal
Glynogwr Colliery A Gilfach Goch level that grew from 79 men in 1910 to 460 in 1929 and closed two years after nationalisation.	Rhondda Cynon Taf	1910–24 September 1949	Coal
Glynrhonwy Quarry A disused slate quarry pressed into service as a Second World War bomb store, whose structure catastrophically collapsed under 14,000 tons of ordnance in January 1942 -- some 14% of the RAF's entire bomb stock at the time -- yet, remarkably, killed no one.	Gwynedd	early 1700s (Lower Glynrhonwy)–25 January 1930	Slate
Glyntillery Colliery The first South Wales colliery to run electric locomotives underground.	Torfaen	c. 1913–January 1976	Coal
Gnoll Colliery The Mackworth family's colliery on the Gnoll estate at Neath, with a steam engine at work by 1753 - among the earliest in Wales - and worked into the 1920s.	Neath Port Talbot	18th century–1926	Coal
Goatfoot Colliery A Galston pit of 1863 to 1920 on the Kilmarnock road, one of the fifteen that ringed the town, now under the Barrwood Gate houses.	East Ayrshire	1863–1920	Coal
Goathland Whinstone Mine The workforce moved underground as the years passed: thirteen of thirty-seven below ground in 1894, twenty of twenty-four by 1905.	North Yorkshire	From 1894–1930	Whinstone
Goatstones Colliery A pit of four or five men near Simonburn, managed by the same uncertificated man from 1894 to 1930.	Northumberland	By 1882–16 May 1932	Coal
Gobbett Tin Mine A small and seldom profitable mine that outlasted five companies over ninety years, then sold its waterwheel to a mine across the moor.	Devon	1790s–1887	Tin
Godolphin Mine A Godolphin estate mine where gunpowder blasting may first have been used in Cornwall, and where an engine house once sank down its own shaft.	Cornwall	By the 1600s–after 1861	Copper, Tin
Godstone Mine Plate rails lifted from the Croydon, Merstham and Godstone Iron Railway were relaid underground here and are still in place — one of the few British sites with plateways where they were laid.	Surrey	Late 17th century–by the 1950s	Firestone, Hearthstone
Goginan Mine A Cardiganshire silver-lead mine worked by three centuries of adventurers, whose shares rose eighty-fold in two years under the Taylors.	Ceredigion	before 1640–1886	Lead, Silver, Zinc
Goitre Colliery Also called Old or Hen Goitre, owned by the Graigola Merthyr Company, abandoning the Hughes seam in 1925.	Neath Port Talbot	By 1910–1925	Coal
Golborne Colliery Site of the 18 March 1979 firedamp explosion that killed ten miners, with only one man — a 20-year-old apprentice — surviving among those caught in the blast.	Greater Manchester	1880 (sinking)–1989	Coal
Golconda Mine A Via Gellia barytes and fluorspar mine near Hopton.	Derbyshire	From the 18th century–1953 (reported)	Lead, Barite, Fluorspar
Golden Dagger Mine The Bronze Age dagger that gave the mine its name links Golden Dagger's own 19th-century industry back to prospectors working the same tin-rich ground roughly four thousand years earlier.	Devon	worked from 1879–November 1930	Tin
Goldsborough Ironstone Mine The last gasp of Cleveland ironstone on this coast: five years, seven people, and then abandoned.	North Yorkshire	About 1910–1915	Ironstone
Goldscope Mine A stream was diverted clean through the mountain to turn a waterwheel hidden underground — one of the more audacious engineering solutions 16th-century German miners brought to Cumbria.	Cumbria	1564–late 19th century	Copper, Lead, Silver, Gold
Goldthorpe Colliery Coal was worked here in 1678, given up in 1783, and started again in 1909 — three beginnings on one piece of ground.	South Yorkshire	1909–1994	Coal
Golynos Colliery An Abersychan ironworks pit whose coal ranked third in Britain in the Admiralty steam trials of 1856.	Torfaen	By 1842–1909	Coal, Fireclay, Ironstone
Gomersal Colliery A hand-got Yorkshire pit closed for fear of flooding after Lofthouse, now part of Oakwell Hall's park.	West Yorkshire	1916–June 1973	Coal
Gonamena A modest 19th-century copper and tin mine overshadowed by its far richer neighbour, South Caradon, once one of the world's largest copper mines.	Cornwall	1844–1886 (final re-trial)	Copper, Tin
Good Luck Mine Named for the ore its finders hoped to strike rich — and never did; its real luck was surviving, almost untouched, under the rubble of its own 1950s demolition	Derbyshire	25 October 1830–1952	Lead, Barite, Fluorspar
Goonvean Pit Its Grade II* listed engine house holds a beam engine built in the 1860s by Harveys of Hayle and moved here from a mine near St Agnes in 1910 -- one of only six surviving Cornish beam engines, and carrying a 1928 replacement beam reputedly the last ever cast.	Cornwall	by 1932	China Clay
Gordon House Colliery A Cockfield pit whose Hall Pit was sunk straight onto a dyke.	County Durham	1863 (worked)–17 February 1962	Coal
Gorseddau Quarry Because it failed so quickly, Gorseddau was never modernised or overbuilt by later working -- its original 1850s layout survives today as a rare, undisturbed snapshot of a mid-Victorian slate quarry.	Gwynedd	1854–c.1867	Slate
Gorseydale Lead Mines Hangworm Mine here was used by 18th-century geologists John Whitehurst and James Pilkington as physical evidence for their competing theories on how the earth's mineral veins had formed.	Derbyshire	from Working by at least 1745	Lead
Gorsgoch Colliery Its owners pumped their floodwater into their neighbour's old workings until the courts made them stop.	Carmarthenshire	Early 1800s–1885	Coal
Gosforth Colliery A Newcastle pit of 1825 sunk 181 fathoms through a great dyke to win the High Main, its coal sold on the London market as 'Gosforth Wallsend'.	Tyne and Wear	1825–1884	Coal
Gospel Oak Colliery Nine thick-coal pits on the Tipton ridge under Grazebrook and Aston, 1860 to 1910, where a candle near the shaft bottom killed two men in 1860 and an overwind two more in 1872.	West Midlands	c. 1858–1860–1910	Coal, Ironstone
Govan Colliery The pit whose winding engine threw sparks over the miners’ rows by night, so that the village they lived in was called Fireworks Village.	Glasgow	By the 18th century–19th century	Coal
Goyt's Moss Colliery A moorland colliery of some two hundred shafts whose coal fed the Duke of Devonshire's lime kilns above Buxton until the ground above water level was worked out.	Derbyshire	Early 17th century–31 December 1893	Coal
Graham's Navigation Colliery A Tredegar pit of 1843 that went through three names, from its sinker's First Class Pit to the No. 9 to Graham's Navigation.	Blaenau Gwent	1843–c. 1925	Coal
Graig Colliery, Aberdare The Waynes' steam-coal pit on Mynydd Graig, where in 1871 a visiting Somerset farmer drowned in the sump after a signalling mix-up.	Rhondda Cynon Taf	1834–c. 1901	Coal
Graig Colliery, Pentrebach Pwll y Graig, sunk for the Plymouth ironworks about 1810, where gas killed seven in 1846, including boys of ten and twelve.	Merthyr Tydfil	c. 1810–c. 1940	Coal
Graig Ddu Quarry A Blaenau Ffestiniog-area slate quarry famous for its home-built 'wild cars', unique among the district's quarries, that let workers ride the inclines down at the end of a shift — a practice that also caused a string of fatal accidents before being stopped in 1939.	Gwynedd	c.1800–1946	Slate
Graig Fawr Colliery A Red Ash pit where two colliers died after working six and a half hours in the wrong place with no official calling.	Blaenau Gwent	1887–1928	Coal
Graig y Fforest No.2 Colliery (Pinetrees) Gin Pit's associate colliery 500 metres to the north on the same Red Vein level, and a separate Dyffryn Level nearby.	Neath Port Talbot	By the 1970s–1993	Coal
Graigola Colliery One of only three south Wales collieries on the Navy's approved coal list by 1837, dating back to a 1791 lease by Richard Parsons.	Neath Port Talbot	from 1791	Coal
Grange Ash Colliery Nothing was ever wound to the tip: the waste was packed back into the workings by hand.	West Yorkshire	1871–1966	Coal
Grange Colliery A Newton Chambers pit at Kimberworth whose men moved to Barley Hall when it closed in 1962.	South Yorkshire	1855–July 1962	Coal
Grangemouth Colliery A Forth-side colliery whose clay won honours at the Great Exhibition and whose subsidence made rare saline lagoons.	Falkirk	1839–1911–1912	Coal
Granville Colliery A Swadlincote colliery worked for over 160 years, from an 1823 sinking to underground connection with Rawdon Colliery in 1990, its sites now a dry ski slope and an industrial estate.	Derbyshire	1823–1967 (surface)	Coal
Grasshill Colliery A Baird colliery of over 200 men at Glenbuck, the village that produced Bill Shankly, worked until its seams were abandoned in 1933.	East Ayrshire	By 1858–1933	Coal
Grassington Moor Mines A 2.5 sq km lead-mining landscape in the Yorkshire Dales, with a 1.7km smelt-mill flue	North Yorkshire	16th century–1880	Lead, Barite, Fluorspar
Grassmoor Colliery The Barnes collieries, whose coke-oven gas lit Chesterfield and whose No. 8 pit killed fourteen men in the explosion of 1933.	Derbyshire	1846 (Blackshale from 1861)–August 1950 (winding)	Coal
Gratton Dale Lead Mines Roman brooches turned up in its surface workings in the mid-19th century, one of them now held in the British Museum's Lucas Collection.	Derbyshire	from From 1641	Lead
Gravel Hill Mine Where the Great Perran Iron Lode reaches the sea: a cliff iron mine of the 1720s to 1880s, and type locality of the rare mineral ferroberaunite.	Cornwall	By 1728 (c. 1840 by one account)–1882	Iron, Zinc
Gray Colliery A Tillery company pit that spent its last twenty years as a ventilation shaft and as the place where new recruits to the industry were trained.	Blaenau Gwent	1893–11 March 1950	Coal
Grays Thurrock Chalk Pit Large-scale chalk quarrying here fed one of Europe's largest 19th-century cement industries before the exhausted pits became a nature reserve.	Essex	From late 18th century–early 1920s	Chalk
Great and East Sortridge Consols One of the Sortridge copper mines floated in the 1850s boom, with 24,000 shares and a 12-inch engine.	Devon	by 1846	Copper, Tin
Great Boys Colliery Named after the farm field it was sunk in — a field description from a century earlier survives, but the colliery itself is remembered today mainly for the 1877 disaster that killed eight of its own men.	Greater Manchester	By 1855–before 1885	Coal
Great Bridge Colliery A Black Country pit where a doggy opened his safety lamp beside a leaking dam in 1849 and fourteen died.	West Midlands	by 1849	Coal
Great Carnon Stream Works Cornwall's most important tin-streaming operation, working a tidal creek bed dammed back to expose gravel rich in tin and alluvial gold.	Cornwall	By 1785–1812	Tin, Gold
Great Condurrow Mine Built in 1906 for a third-hand engine, Woolf's engine house is one of the last ever raised in Cornwall; the mine also gave condurrite its name.	Cornwall	By 1815–1914	Tin, Copper
Great County Adit Still draining Cornwall's abandoned tin and copper mines more than two centuries after it was dug, decades after every mine it served has closed.	Cornwall	1748–Still active	Tin, Copper
Great Crinnis Mine Dismissed as 'not worth a pipe of tobacco', the abandoned workings made Joshua Rowe's fortune when he struck rich copper ore only ten fathoms down in 1811.	Cornwall	By 1809–c. 1881	Copper, Lead, Silver
Great Darren Mine A silver-lead lode worked beside a hillfort whose ramparts contain lead ore, perhaps mined since prehistory.	Ceredigion	By 1617 (Myddelton lease)–1890	Lead, Copper, Silver
Great Dowgas Mine Worked five parallel south-east-trending lodes near St Stephen-in-Brannel from about 1719 to 1913; briefly traded jointly with part of neighbouring St Austell Consols in 1873 as ‘St Stephen Tin and Copper Mines’, and finished its life amalgamated with Ventonwyn Mine. A contemporary in 1865 called it ‘always a poor mine’.	Cornwall	c. 1719–1913	Tin, Copper, Cobalt, Nickel
Great Haigh Sough A 1,120-yard drainage sough driven under the Haigh estate between 1653 and 1670, cut without explosives at sixty-six yards a year.	Greater Manchester	1653–1670–Still active	Coal, Cannel Coal
Great Hewas Mine The mine Sticker village grew up around, with a Boulton & Watt engine in the 1790s and £7,000 of new steam engines in 1853.	Cornwall	from 1700s	Tin, Copper, Lead
Great Laxey Mine Home of the Laxey Wheel, among the largest working waterwheels anywhere	Isle of Man	1780s–1929	Lead, Copper, Silver, Zinc
Great Lever Colliery The Earl of Bradford's Bolton pit, which grew from 183 to 437 men in the 1900s and sold its coal for gas, house and factory.	Greater Manchester	1855–1920	Coal
Great Mountain Colliery The anthracite pit that made Tumble, where imported strikebreakers set off the riots of 1893 and sudden outbursts of coal and gas killed five.	Carmarthenshire	1887–5 May 1962	Coal
Great Orme Copper Mines The largest prehistoric copper mine yet discovered anywhere in the world	Conwy	c. 1700 BC–c. 600 BC	Copper, Lead
Great Red Soil Mine The vein this mine is named for gave its name, in turn, to one of Derbyshire lead mining's darker episodes -- three men suffocated in 1833 in a dispute over exactly this ground.	Derbyshire	1831–19th century	Lead
Great Rock Mine Sold its ore for the shine, not the iron — the flakes went into the paint on the Sydney Harbour Bridge	Devon	c. 1822–1969	Micaceous Haematite, Iron
Great Sheba Consols A Duchy of Cornwall copper sett near Kit Hill worked under at least five names in thirty years, of which a lone listed chimney remains.	Cornwall	1838–1867	Copper
Great Sleddale Mine Unusually for Swaledale, worked for copper rather than lead -- a shallow 1908 trial at Long Scar, in a dale otherwise dominated by the lead workings of the Old Gang and Gunnerside groups.	North Yorkshire	from c. 1908	Copper
Great Weeke Mine A Chagford tin mine that three companies tried to revive in sixteen years, returning only 56 tons of tin.	Devon	1887–1903	Tin
Great Western Colliery Its 1875 Hetty winding engine still turns — the only large steam engine in Wales in working order, and the oldest two-cylinder horizontal winder in the UK on its original site.	Rhondda Cynon Taf	August 1851–November 1983	Coal
Great Wheal Charlotte A copper and tin mine between St Agnes and Porthtowan, Cornwall, worked before 1820 to 1840.	Cornwall	By 1820–c. 1840 (reduced working to c. 1863)	Copper, Tin
Great Wheal Eleanor Promoted in 1875 as needing no engine or coal because the water would do everything; its wheelhouse is among the finest on Dartmoor.	Devon	1874–1884	Tin
Great Work Mine Long-lived tin and copper mine near Godolphin and Tregonning Hill, worked intermittently across four centuries with Grade II-listed engine house remains surviving on site.	Cornwall	By 1538–1939	Tin, Copper, Lead
Great Wyrley Colliery The Great Wyrley Colliery Company's Cannock Chase pits of 1872 to 1925, whose worked-out shafts closed a canal branch, and whose museum page quietly runs on into Harrison's No. 3.	Staffordshire	Working by 1872 (1806 per museum)–1925	Coal, Ironstone
Greatfield Colliery Westwood's Pit, a small Ossett colliery that worked on under the National Coal Board until 1954.	West Yorkshire	1913–September 1954	Coal
Grebe Swallet Mine Rediscovered only after the 1968 Mendip floods tore open its entrance, the mine preserves a uniquely intimate trace of its last working miners: on Tuesday 20 November 1753, an eight-year-old boy named Henry Young and his younger companion John Clark left their names, finger-marks and practice handwriting in the soft mud deep underground -- almost certainly while accompanying their miner fathers -- and the marks survived undisturbed for over two centuries.	Somerset	from Roman	Lead
Green Hurth Mine A high Teesdale lead mine whose unusually silver-rich ore paid well until water beat it in 1902.	County Durham	1799 (lease)–1902	Lead, Zinc
Greenburn Mine Greenburn owes its survival today to an unlikely benefactor: the land passed into National Trust care in 1930 as a bequest from Beatrix Heelis — Beatrix Potter — better remembered for Peter Rabbit than for saving a Lake District copper mine.	Cumbria	From late 17th century–c. 1885	Copper
Greencroft Tower Colliery A north-west Durham colliery on the Greencroft estate, worked from its first borings in 1838 until closure as a drift in 1957.	County Durham	1838–July 1957	Coal
Greenfield Colliery A Hamilton pit whose bursting boiler was flung 150 yards through the roof of the village schoolroom in 1874.	South Lanarkshire	Early 1860s–after 1933	Coal
Greenhead Colliery, Harperley A Harperley pit of a dozen men that outlasted four owners and three abandonments before closing in 1907.	County Durham	1860s–24 May 1907	Coal
Greenhead Gill Mine An Elizabethan lead mine run by German miners, whose 1586 inventory lists twelve stamps, eleven buddles and a 'rowle wagon' for work underground.	Cumbria	c. 1564–1573	Lead
Greenhill Colliery The Polquhairn Coal Company's small pit near Ochiltree, merged with Polquhairn in 1958.	East Ayrshire	By 1910–September 1958 (merged with Polquhairn)	Coal
Greenhow Mines Two abbeys agreed in 1226 that whoever broke their mining truce must walk to the other house to apologise and live on bread and water every Friday for a year.	North Yorkshire	Roman–c. 1900	Lead, Fluorspar
Greenlaws Mine Despite hosting spectacular purple and yellow fluorite specimens where its east vein cuts the Great Limestone, Greenlaws never became a commercial fluorspar producer -- a 1940s attempt to reopen it for exactly that purpose failed, and it took a team of enthusiast cavers seven years, starting in the 2010s, to dig back down to the first of the abandoned flats and begin recovering those specimens for collectors instead.	County Durham	c. 1700 (workings recorded from 1725)–late 1880s	Lead
Greenrigg Colliery United Collieries' deep pit of 1905 between Harthill and Fauldhouse, rebuilt after a pithead fire in the 1920s and worked by six hundred people until 1960.	West Lothian	1905–1960	Coal, Fireclay, Ironstone
Greenrigg Pit Abandoned for more than 170 years and still readable in the grass: the shaft, the bing, and the footings and garden walls of the row that housed the men who sank it.	West Lothian	1806–by 1856	Coal
Greenside Colliery Greenside's own pit, once the largest in the district, whose lodge banner still leads the village to the Durham Miners' Gala.	Tyne and Wear	1795–1796 (A Pit sunk)–23 July 1966	Coal
Greenside Mine Major Lake District lead producer with extensive surface remains	Cumbria	1825–1962	Lead, Silver
Greetwell Ironstone Mines Five million tons of ore from the edge of Lincoln, two thirds of it mined underground by pillar and stall, hauled by horses to the very end.	Lincolnshire	c. 1873–1939	Ironstone, Limestone
Gregory Mine Ashover's great lead mine, which paid £100,000 in fifty years and left the orefield's chief mining monument.	Derbyshire	Early 1700s–1806	Lead
Gresford Colliery Gresford Colliery reopened and worked for almost forty years after entombing 261 of its own men underground — the sealed Dennis section remaining an active part of the mine's below-ground geography for the rest of its working life, worked around rather than reopened.	Wrexham	1908 (sinking)–1973	Coal
Greyfield Colliery A Somerset colliery begun under an 1833 lease from the Earl of Warwick and closed in 1911 after water from old workings flooded the Streak Vein.	Somerset	1833–28 May 1911	Coal
Griff Colliery Part of the Arbury estate whose land agent was novelist George Eliot's father, close to her childhood home at Griff House.	Warwickshire	1716–1960	Coal
Griffin No. 1 Colliery The original Griffin pit at Nantyglo, whose steam coal Lancaster's sold to steamship lines and foreign railways.	Blaenau Gwent	Before 1868–c. 1909 or 1922	Coal
Grime's Graves A Neolithic flint mine over 4000 years old; miners' antler picks and even a fingerprint survive in its shafts	Norfolk	c. 2600 BC–c. 2400 BC or c. 2100 BC	Flint
Grimebridge Colliery A hard-coal Rossendale pit of 1851, reopened by its own colliers and worked until 1996.	Lancashire	1851–November 1963	Coal
Grimethorpe Colliery A South Yorkshire colliery whose profitable 1993 closure left its town named Britain's most deprived, an experience that inspired the film Brassed Off.	South Yorkshire	From 1894 (sinking)–May 1993	Coal
Grinkle Mine A Cleveland ironstone mine whose ore was hauled by narrow-gauge tramway through two tunnels to a purpose-built harbour at Port Mulgrave, built specifically to supply a Tyneside ironworks.	North Yorkshire	1875–1930 (site abandoned 1934)	Iron
Grinshill Quarry Nine hundred years of quarrying on one Shropshire hill, and the stone around the front door of Number 10 Downing Street.	Shropshire	By the 12th century–Still active	Sandstone
Grinton Smelt Mill The best-preserved lead smelt mill in the Yorkshire Dales, with its three-hearth furnace house, peat store and a flue climbing 300 metres up the hill.	North Yorkshire	c. 1727–1886-95 (sources differ)	Lead
Groby Granite Quarry Its granite paved Victorian London, carried on a railway the Stephensons advised on and finished before the Leicester and Swannington itself opened.	Leicestershire	by 1832	Granite
Groesfaen Colliery A Rhymney Iron Company pit sunk 2,159 feet for 183,723 pounds, and one of 42 collieries that worried the Coal Board and the union over accidents in 1954-55.	Caerphilly	From 1902 (sinking)–22 November 1968	Coal
Grogwynion Mine Grogwynion was already an old mine by 1744, one of only a handful still working in Ceredigion that year — and low galleries cut by hand with gads, found within the workings, hint at activity older still than any documentary record of the site.	Ceredigion	By 1744–1889	Lead
Grosmont Ironstone Mines North Yorkshire ironstone mines discovered during construction of George Stephenson's Whitby and Pickering Railway, feeding a village ironworks that once ran three blast furnaces.	North Yorkshire	1836–1891/92	Iron
Grougar Colliery An Ayrshire ironmasters' pit where a thirteen-year-old pony driver died under a runaway race he had not finished coupling.	East Ayrshire	1855–c. 1890	Coal
Grove Colliery A single explosion in 1930 ended the colliery's own coal-getting for good — though its washery kept working someone else's coal for twenty years afterward.	Staffordshire	1852–1952 (coal winding ended 1930)	Coal
Grove Colliery, Kilgetty Its shaft was described in 1859 as the largest in Wales, sunk to a vein that turned out to be very disappointing; the engine house is a magnificent ruin.	Pembrokeshire	1856–1884	Anthracite
Groverake Mine A mine that changed what it was digging for three times over — iron, then lead, then fluorspar — before finally being the last of its kind left standing.	County Durham	From 1819–1999	Fluorspar, Lead, Iron
Grovesend Colliery A Gorseinon pit that went through six owners in its first thirty years before Thomas Williams & Sons revived it.	Swansea	1851–1 June 1925	Coal
Guerets Colliery A Victorian Graigola pit at Clydach whose flooded workings were pumped out forty years later to ventilate the neighbouring Felinfran Colliery.	Swansea	Early 1850s (Ynyspenllwch slant)–1904	Coal
Gunnerton Quarry Its stone built tenements in Edinburgh's Morningside in 1885 and was weathering visibly at the Meadows Pillars seven years later — and the quarry is still open.	Northumberland	By 1885–Still active	Sandstone
Gunnislake Clitters Mine A Tamar valley mine that went from copper to tin to arsenic as each ran out, and whose engine houses and arsenic labyrinths still stand in the woods above the river.	Cornwall	c. 1820–1919	Copper, Tin, Arsenic, Tungsten
Gurnard's Head Mine A cliff-edge copper mine whose first shaft needed a stone collar to keep out the sea.	Cornwall	Before 1821–1877	Copper
Gurney Slade Quarry The face shows Jurassic rocks lying flat across the sawn-off edges of limestone tilted long before them.	Somerset	Mid 19th century–Still active	Limestone
Gurnos Colliery Its first slant was an older mine's, Wernplemis, abandoned a generation before, and after it closed in 1928 it was kept on for sixteen years just to pump water.	Powys	About 1900 (Wernplemis before 1858)–1928 (pumping to 1944)	Coal
Guy Mine One of the Alport Mining Company's five hydraulic pumping engines; its shaft ran in on the night of its own 1852 auction sale.	Derbyshire	1841–1852	Lead
Gwaelod-y-Waun Colliery A small Mynyddislwyn level east of Aberbargoed, first tied by an incline tramway to coke ovens, that lasted from the 1870s to 1950.	Caerphilly	Mid 1870s–1950	Coal
Gwaith Yr Afon Mine One of a cluster of satellite workings around the much larger Cwmsymlog (East Darren) silver-lead mine, developing minor veins on the same Darren-Cwmsymlog fault system.	Ceredigion	1853–1878 (worked intermittently)	Lead
Gwane Colliery A Rowley Regis pit whose owner was told to widen its airway, did not, and lost nine men in 1857.	West Midlands	by 1857	Coal, Ironstone
Gwaun Cae Gurwen Colliery The Amman valley anthracite pits whose miners fought the Coal Board through 238 unofficial stoppages in nine years.	Neath Port Talbot	1837–1962 (East Pit)	Coal
Gwaunclawdd Colliery Its first recorded plans are dated 1818, and in its slant a single section showed the Big Vein over ten feet thick with six other seams between the outcrop and 464 feet.	Powys	By 1818–1927	Coal
Gwenallt Colliery A Pontypool pit that outlived its own coal by decades as the pumping shaft for Tirpentwys and Llanerch.	Torfaen	By 1880–1929	Coal
Gwendraeth Colliery Daniel Watney's anthracite pit at Pontyberem, where 26 of the 27 men and boys on the night shift drowned in 1852 and the bodies took 18 months to recover.	Carmarthenshire	By 1852, possibly earlier–1870s	Coal
Gwendraeth Colliery, Pontyates A Gwendraeth Valley mine that worked a single seam, the Carway Fawr, across the largest area in the valley and never suffered an outburst.	Carmarthenshire	Late 19th century–1928	Anthracite
Gwersyllt Colliery A pit so tied to its neighbour that one census of mines could not count it separately.	Wrexham	From mid 1840s–1925	Coal
Gwrhay Colliery A Sirhowy valley level where, by a mother's 1842 account, her son went underground at five years and three months old.	Caerphilly	By 1832–c. 1918	Coal
Gwscwm Colliery A Pembrey colliery flooded out in 1863, revived to employ nearly four hundred in the 1920s, and ending its days digging fireclay rather than coal.	Carmarthenshire	c. 1818–after 1949	Coal, Fireclay
Gwyn's Colliery A Pontardawe level that passed from the South Wales Primrose Coal Company to the Tareni Colliery Company in 1928.	Neath Port Talbot	1902–by 1928	Coal
Gwynfynydd Gold Mine The second-largest gold producer in the Dolgellau gold belt after Clogau; supplied the ingot presented to the Queen on her 60th birthday	Gwynedd	1863 (discovery)–1998	Gold