Operators
Companies and organisations that worked published mines, where that history is known.
100 operators beginning with M, of 1903.
| Operator | Mines | Active | Regions | Commodities |
|---|
| M-I SWACO |
2 |
1984–2021 |
Perth and Kinross |
Barite |
| M. Hutchinson & Co |
1 |
1875–1877 |
Cumbria |
Copper, Lead |
| Macclesfield Copper Company |
1 |
|
Cumbria |
Copper |
| Macintosh and Wilson |
1 |
from 1797 |
Renfrewshire |
Alum, Coal, Limestone |
| Madeley Collieries Ltd |
1 |
to 1947 |
Staffordshire |
Coal |
| Madeley Wood Co Ltd |
1 |
1918–1938 |
Shropshire |
Coal, Iron |
| Madeley Wood Company |
4 |
1770–1968 |
Shropshire |
Coal, Iron, Fireclay |
| Magdalen College, Oxford |
1 |
1474–1899 |
Oxfordshire |
Freestone |
| Magheramorne Lime Company |
1 |
to 1911 |
County Antrim |
Chalk, Limestone |
| Maglona Quarries Ltd |
1 |
1893–1903 |
Powys |
Slate |
| Main Colliery Company Ltd |
4 |
1889–1929 |
Neath Port Talbot |
Coal |
| Mainsforth Coal Co. |
1 |
1873–1877 |
County Durham |
Coal |
| Major Stewart |
1 |
from 1885 |
Dumfries and Galloway |
Copper, Nickel |
| Malehurst Barytes Co. Ltd |
3 |
1945–1947 |
Shropshire |
Barite, Copper |
| Maltby Main Colliery Company |
1 |
from 1908 |
South Yorkshire |
Coal |
| Manchester Collieries Ltd |
13 |
1929–1947 |
Greater Manchester |
Coal, Cannel Coal |
| Manvers Main Collieries Ltd |
1 |
1911–1947 |
South Yorkshire |
Coal |
| Manvers Main Colliery Co. Ltd |
1 |
1867–1947 |
South Yorkshire |
Coal |
| Manvers Main Colliery Company |
1 |
1945–1947 |
South Yorkshire |
Coal |
| Mapperley Colliery Company |
1 |
1884–1947 |
Derbyshire |
Coal |
| Marble and Slate Company of Netherlorn |
2 |
1745–1881 |
Argyll and Bute |
Slate |
| Mark Weir |
1 |
1997–2011 |
Cumbria |
Slate |
| Marke Valley Consols Mines Ltd |
1 |
1881–1890 |
Cornwall |
Copper, Tin |
| Markham Main Colliery Ltd |
1 |
1916–1937 |
South Yorkshire |
Coal |
| Marley Hill Coal Company |
2 |
1860–1880 |
County Durham, Tyne and Wear |
Coal, Fireclay |
| Marquess of Londonderry |
2 |
1849–1947 |
County Antrim, County Durham |
Coal, Fireclay, Limestone |
| Marquis of Lothian |
1 |
to 1890 |
Midlothian |
Coal, Fireclay |
| The Martin family |
1 |
1862–1919 |
Devon |
China Clay |
| Maryport Hematite Iron & Steel Company |
2 |
1882–1893 |
Cumbria |
Iron |
| Matthew Featherstonhaugh |
1 |
1738–1794 |
Essex |
Chalk |
| McGhie brothers |
1 |
1905–1927 |
Cumbria |
Gypsum |
| McKechnie Bros |
1 |
from 1961 |
Cumbria |
Barite |
| Measham Collieries Ltd |
1 |
1894–1947 |
Leicestershire |
Coal |
| Meiklehill Coal Co. |
1 |
|
East Dunbartonshire |
Coal, Ironstone |
| The Mellor family of Hough Hole |
1 |
from 1803 |
Cheshire |
Coal |
| Mendip Hills Mining Company |
2 |
1844–1861 |
Somerset |
Lead |
| Mendip Mining Company |
1 |
1844–1878 |
Somerset |
Lead, Silver |
| Mercer and Evans |
1 |
1855–1873 |
Merseyside |
Coal |
| Merionethshire Slate Company |
1 |
from 1787 |
Gwynedd |
Slate |
| Merry & Cuninghame |
3 |
1854–1931 |
North Ayrshire, North Lanarkshire, South Lanarkshire |
Coal, Iron, Ironstone |
| Merrybent and Middleton Tyas Mining and Smelting Company |
1 |
1856–1878 |
North Yorkshire |
Copper, Lead |
| Merrybent Mining Company |
1 |
1910–1920 |
North Yorkshire |
Copper, Lead |
| Merthyr (South Wales) Ltd |
1 |
2007–2023 |
Merthyr Tydfil |
Coal |
| Messrs Brookes Ltd |
1 |
1908–1950 |
Cumbria |
Granite |
| Messrs. Easton & Co. |
1 |
from 1850 |
Tyne and Wear |
Coal |
| Messrs. Morrison |
1 |
|
Northumberland |
Coal |
| Metal Innovations Ltd |
1 |
from 2008 |
Neath Port Talbot |
Coal |
| The Metcalfe family |
1 |
1872–1915 |
North Yorkshire |
Sandstone |
| Methusalem Jones |
1 |
1760–1800 |
Gwynedd |
Slate |
| Michael Loam |
1 |
1842–1843 |
Cornwall |
Arsenic, Copper, Tin |
| Micklefield Coal and Lime Company |
1 |
1909–1938 |
West Yorkshire |
Coal |
| Mickley Coal Co. |
2 |
from 1882 |
Northumberland |
Coal, Fireclay |
| Mid Cannock Colliery Co. |
1 |
1875–1915 |
Staffordshire |
Coal |
| Mid Devon Mining Company |
1 |
1878–1891 |
Devon |
Arsenic, Copper |
| Mid Durham Coal Company |
1 |
1929–1947 |
County Durham |
Coal |
| Mid-Lincolnshire Ironstone Company |
2 |
1928–1938 |
Lincolnshire |
Ironstone, Limestone |
| Midhurst Brick & Lime Co. Ltd |
1 |
1926–1993 |
West Sussex |
Chalk |
| Midland Brick Co. (Wellingborough) Ltd |
1 |
1910–1937 |
Northamptonshire |
Ironstone, Limestone |
| Midland Coal, Coke and Iron Company |
2 |
1890–1930 |
Staffordshire |
Coal |
| Midland Quarry Products |
2 |
from 1997 |
Leicestershire, Shropshire |
Coal, Granite, Whinstone |
| Midlands Mining plc |
1 |
1994–2000 |
Nottinghamshire |
Coal |
| Midlands Quarry Company |
1 |
from 1876 |
Warwickshire |
Diorite, Sandstone |
| Millom and Askam Co |
2 |
1913–1968 |
Cumbria |
Iron |
| Milnes family of Flockton |
1 |
1764–1815 |
West Yorkshire |
Coal, Ironstone |
| Ministry of Supply |
1 |
1939–1945 |
Gwynedd |
Manganese |
| Minllyn Slate Company |
1 |
1889–1925 |
Gwynedd |
Slate |
| MNS Mining Ltd |
1 |
to 2011 |
Neath Port Talbot |
Coal |
| Mobberley and Perry |
1 |
1920–1947 |
West Midlands |
Coal |
| Moel Tryfan Slate & Slab Co. Ltd |
1 |
1879–1918 |
Gwynedd |
Slate |
| Moelferna and Dee Side Slate and Slab Quarries Company |
1 |
1876–1947 |
Denbighshire |
Slate |
| The Moira Colliery Company Limited |
1 |
1895–1947 |
Leicestershire |
Coal, Fireclay |
| Mona and Parys Mines Ltd |
1 |
1899–1904 |
Anglesey |
Copper, Gold, Lead |
| Mona Mining Company |
1 |
from 1846 |
Isle of Man |
Lead |
| Moorside Mining Company |
1 |
1993–2013 |
Derbyshire |
Coal |
| Morallee Fell Mining Co. |
1 |
from 1888 |
Northumberland |
Lead |
| Moray Stone Cutters |
1 |
from 1990 |
Moray |
Freestone |
| Moresby Coal Co., Ltd. |
1 |
1877–1947 |
Cumbria |
Coal |
| Morfa Du mining company |
1 |
1881–1904 |
Anglesey |
Copper |
| Morgan and Lewis |
1 |
1840–1869 |
Neath Port Talbot |
Coal |
| Morgan and Perkins |
1 |
from 1823 |
Neath Port Talbot |
Coal |
| Morgan Stuart Williams |
1 |
1880–1920 |
Neath Port Talbot |
Coal |
| Morris and Perry Ltd |
1 |
from 1962 |
Somerset |
Limestone |
| Moses Bawden |
2 |
1860–1914 |
Devon |
Tin |
| Moses Teague |
1 |
1832–1840 |
Forest of Dean |
Coal |
| Moss Hall Coal Company |
2 |
1860–1930 |
Greater Manchester, Lancashire |
Coal |
| Moss Rake Mining and Lead Smelting Company |
1 |
to 1895 |
Derbyshire |
Calcite, Lead |
| Mossfield Colliery Company |
1 |
|
Staffordshire |
Coal |
| Mostyn Coal and Iron Company |
1 |
1802–1879 |
Flintshire |
Coal |
| Mountsorrel Granite Company |
2 |
1872–1960 |
Leicestershire |
Granite |
| Mowbray Iron Ore Company |
1 |
from 1864 |
Cumbria |
Iron |
| Mr Hodgson |
1 |
to 1920 |
Derbyshire |
Lead |
| Mr Hurst |
1 |
|
Lancashire |
Sandstone |
| Mr Williamson |
1 |
from 1755 |
Dumfries and Galloway |
Lead |
| Mr. Wade |
1 |
from 1792 |
Tyne and Wear |
Coal |
| Mrs E. S. Walton |
1 |
from 1921 |
Cumbria |
Coal |
| Muirkirk Iron Company |
1 |
1787–1856 |
East Ayrshire |
Coal, Ironstone |
| Muirshiel Barytes Company |
1 |
1947–1962 |
Renfrewshire |
Barite |
| Muirshiels Mineral Co. |
1 |
to 1920 |
Renfrewshire |
Barite |
| Myers Mining Co. |
1 |
|
Pembrokeshire |
Anthracite |
| Mynydd Newydd Colliery Company |
1 |
1900–1947 |
Swansea |
Coal |
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