Operators
Companies and organisations that worked published mines, where that history is known.
18 operators beginning with U, of 1903.
| Operator | Mines | Active | Regions | Commodities |
|---|
| Udston Coal Company Limited |
1 |
from 1875 |
South Lanarkshire |
Coal |
| UK Coal |
5 |
1994–2015 |
North Yorkshire, Nottinghamshire |
Coal |
| UK Coal Operations Ltd |
1 |
1994–2013 |
Warwickshire |
Coal |
| UK Consolidated Mining Limited |
1 |
1992–1993 |
Carmarthenshire |
Coal |
| UK Mining Ventures Ltd |
2 |
from 2017 |
County Durham |
Fluorspar |
| Ulster Fireclay Works |
1 |
1890–1960 |
County Tyrone |
Coal, Fireclay |
| United Anthracite Collieries Limited |
2 |
1920–1947 |
Carmarthenshire |
Anthracite, Coal |
| United Collieries Limited |
7 |
1905–1947 |
West Lothian, East Dunbartonshire, Falkirk |
Coal, Ironstone, Fireclay |
| United Merthyr Collieries Company |
2 |
1864–1866 |
Rhondda Cynon Taf |
Coal |
| United Minera Mining Company |
1 |
1897–1914 |
Wrexham |
Lead, Zinc |
| United National Collieries Ltd |
3 |
1892–1928 |
Caerphilly, Rhondda Cynon Taf |
Coal |
| United National Steam Company |
1 |
1880–1912 |
Rhondda Cynon Taf |
Coal |
| United Newry Granite Company |
1 |
1870–1900 |
County Down |
Granite |
| United States Army |
1 |
1943–1944 |
Devon |
Tin |
| United Steel Companies |
5 |
1918–1973 |
Cumbria, South Yorkshire, Rutland |
Coal, Fireclay, Ganister |
| United Westminster and Wrexham Collieries Company |
1 |
1908–1973 |
Wrexham |
Coal |
| Unity Mine Ltd |
1 |
from 1999 |
Neath Port Talbot |
Coal |
| Upton Colliery Company |
1 |
1924–1939 |
West Yorkshire |
Coal |
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