MineArchiveMines
19 mines beginning with O, of 1950.
| Mine | Region | Worked | Commodities |
|---|---|---|---|
| Oakdale Colliery A Sirhowy Valley colliery sunk from 1907, employing over 2,000 men at its 1938 peak. |
Caerphilly | sinking from 1907; production from 1911–August 1989 | Coal |
| Oakeley Quarry For every finished ton of slate Oakeley ever sold, its miners had to remove nine tons of waste rock — over the mine's lifetime, more than 100 million tons of it, enough to bury the mine's own original village beneath a single spoil tip. |
Gwynedd | 1818–1969 (underground); final closure 2010 (surface, after subsidence) | Slate |
| Oakley Colliery A village built for an ironworks in 1846, surrounded by hybrid coal-and-ironstone pits, in the field that was Fife's principal source of iron. |
Fife | 1893 (in production by 1895); earlier pits from the 1820s–No reliable closure date has yet been located. | Coal, Ironstone |
| Oaks Colliery Oaks Colliery's 1866 disaster killed so many rescuers alongside the original victims — 23 volunteers from neighbouring pits died in the second explosion trying to save survivors — that for decades afterwards it stood as a stark warning about the dangers of underground rescue itself, not just of mining. |
South Yorkshire | shaft sunk early 1830s–workings absorbed into Barnsley Main Colliery from 1929 | Coal |
| Oatfield Mine A Crowan copper mine of the 1840s at the eastern end of the Crenver and Wheal Abraham lodes, absorbed into that mine about 1864 and still marked by two open shafts. |
Cornwall | By 1825 (newspaper notice); worked in the 1840s–Absorbed into Crenver & Wheal Abraham c. 1864 | Copper |
| Odin Mine Reputedly one of the oldest named lead mines in Derbyshire |
Derbyshire | 1280 (documented)–1869 | Lead, Barite, Fluorspar, Calcite |
| Ogilvie Colliery Concrete-lined shafts and machine mining from the day it opened in 1923, which was new for Powell Duffryn; a fire in 1971 helped close it. |
Caerphilly | 1923 (sinking from 1918)–April 1975 | Coal |
| Okeltor Mine Its arsenic refining works are considered among the best-preserved of their date anywhere in the country, the surviving shaft kiln -- used to roast ore in narrow brick-lined shafts -- an especially rare survival. |
Cornwall | Adit dug around 1845–Final production in 1887 | Copper, Arsenic, Tin |
| Old Burghclere Lime Quarry A Hampshire chalk quarry whose lime left by rail in sacks, and whose steep warm sides now hold fly orchids and small blue butterflies. |
Hampshire | 1885–April 1938 | Chalk |
| Old Castle Colliery Llanelli's biggest colliery in the 1840s, begun by General Warde about 1811; six drowned when old Bres workings broke in during 1862. |
Carmarthenshire | c. 1811 (Erw pit 1810)–May 1889 | Coal |
| Old Gang Mines The peat store built to fuel Old Gang's furnaces ran to 39 bays over some 400 feet — a reminder that a lead mine this size consumed almost as much organised logistics in fuel as it did in ore. |
North Yorkshire | 18th century–1899-1903 | Lead |
| Old Mills Colliery The last training pit of the Somerset coalfield: once it stopped winding coal its shaft was kept for supplies and for teaching men the job, and its workshops taught the Coal Board’s apprentice electricians until Radstock got a technical college. |
Somerset | 1860–1966 | Coal |
| Old Pit Radstock Sunk in 1793 this was the founding pit of the once-75-mine Somerset Coalfield whose story is now told at the Radstock Museum. |
Somerset | 1793–No reliable closure date has yet been located. | Coal |
| Ollerton Colliery St Paulinus church, built for the model village and billed by its own builders as 'the cathedral of the new coalfield', began life as a commission for Sir Giles Gilbert Scott — later famous for Battersea Power Station and the red telephone box — before he was dismissed from the project. |
Nottinghamshire | Sunk 1923-25 by the Butterley Company; production from 1925–1994-95 | Coal |
| Onllwyn Colliery The drifts closed in the 1960s and the washery kept going until 2023, the last working piece of the anthracite industry in the valley. |
Neath Port Talbot | Before 1831 (Nos. 1 and 3); developed from the 1840s–1962 (No. 3); April 1964 (No. 1 drift) | Coal, Anthracite |
| Orgreave Colliery A Rother Vale colliery whose coke fed Scunthorpe's furnaces, and whose site is now an advanced manufacturing park. |
South Yorkshire | 1851–October 1981 | Coal |
| Ormonde Colliery Pioneered the remotely operated longwall face in 1963, an attempt to take men off the coalface altogether, and closed seven years later. |
Derbyshire | 1908 (sinking from 1906)–25 September 1970 | Coal |
| Outwood Colliery A single underground fire brought its own headgear crashing down the shaft it stood over — the colliery never recovered, though the site washed other mines' coal for another 25 years. |
Greater Manchester | 1840s–1931 (deep working); washery to 1956 | Coal |
| Oxlow Rake Lead Mines A branch called Daisy or Deasy Rake appears on Castleton's 1691 enclosure map, suggesting work here began even before the first named production record of 1709. |
Derbyshire | Documented from 1709; possibly worked by 1691–No reliable closure date has yet been located. | Lead |