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Company Name |
Location |
Area |
Year |
Class |
Box No |
Company No |
| C”tes-du-Nord Silver Lead Mines Ltd | 1886 | BT31 | 3720 | 23133 | ||
| C.B. Briggs & Co. Ltd | 1921 | BT31 | 26951 | 178683 | ||
| C.B. Lead Mines Ltd | Arkengarthdale | Yorkshire | 1907 | BT31 | 12159 | 95406 |
| C.H. Briggs & Co. Ltd | 1915 | BT31 | 22962 | 141402 | ||
| C.J.W. Prospecting Syndicate Ltd | 1911 | BT31 | 20121 | 116768 | ||
| Caceres Tin Mines Ltd | Spain | 1900 | BT31 | 9234 | 68540 | |
| Cae Coch Pyrites Mine Ltd | Trefriw | Caernarvonshire | 1888 | BT31 | 4102 | 26318 |
| Cae Pant Mining Co. Ltd | Minera | Denbighshire | 1863 | BT31 | 816 | 617C |
| Caegynon Lead Mining Co. Ltd | Rheidol Valley | Cardiganshire | 1870 | BT31 | 1520 | 4773 |
| Caelan Cefn Gwyn & Kylon Potosi United Mining Co. Ltd | Machynlleth | Montgomeryshire | 1874 | BT31 | 2009 | 8661 |
| Cafartha Lead Mining Co. Ltd | Penegoes | Montgomeryshire | 1770 | BT31 | 1527 | 4821 |
| Cafartha Mines Co. Ltd | Cadfarch | Montgomeryshire | 1858 | BT31 | 380 | 1401 |
| Cafartha Mines Co. Ltd | Cadfarch | Montgomeryshire | BT41 | 114 | 654 | |
| Cagliari Mining Co. Ltd | 1870 | BT31 | 1543 | 4925 | ||
| Cala Mines Syndicate Ltd | 1897 | BT31 | 7421 | 52712 | ||
| Cala Mines Syndicate Ltd | 1894 | BT31 | 6000 | 42351 | ||
| Calcot Hall Mining Co. Ltd | Ysceifiog | Flintshire | BT41 | 114 | 657 | |
| Calcot Hall Mining Co. Ltd | Ysceifiog | Flintshire | 1856 | BT31 | 205 | 622 |
| Caldbeck Fells (Consolidated) Lead & Copper Mining Co. Ltd | Caldbeck | Cumberland | 1864 | BT31 | 1038 | 1759C |
| California Mining Co. Ltd | California | U.S.A. | 1871 | BT31 | 1596 | 5327 |
| California Prospecting Co. Ltd | California | U.S.A. | 1871 | BT31 | 1667 | 5889 |
| Californian Consolidated Quartz Mining Co. Ltd | California | U.S.A. | 1856 | BT31 | 16 | 83 |
| Californian Consolidated Quartz Mining Co. Ltd | California | U.S.A. | 0 | BT41 | 115 | 677 |
| Californian General Mining Co. Ltd | California | U.S.A. | 1908 | BT31 | 18662 | 100876 |
| Callington Arsenic Company Ltd | Callington | Cornwall | 1924 | BT31 | 28545 | 198369 |
| Callington Development Syndicate Ltd | Callington | Cornwall | 1907 | BT31 | 12032 | 94001 |
| Callington Minerals Ltd | Callington | Cornwall | 1913 | BT31 | 14111 | 129082 |
| Callington Tin Mines Ltd | Callington | Cornwall | 1905 | BT31 | 11052 | 84030 |
| Callington United Mines Ltd | Callington | Cornwall | 1888 | BT31 | 4074 | 26075 |
| Calloose Tin Mines & Alluvials Ltd | Leedstown | Cornwall | 1919 | BT31 | 25349 | 161656 |
| Calstock & Danescombe Consolidated Mining Co. Ltd | Calstock | Cornwall | 1880 | BT286 | 489 | |
| Calstock & Danescombe Consolidated Mining Co. Ltd | Calstock | Cornwall | 1888 | BT286 | 86 | |
| Camarones Copper Mining & Smelting Co. Ltd | Chile | 1888 | BT31 | 4282 | 27788 | |
| Camborne Consols Mining Co. Ltd | Camborne | Cornwall | 1886 | BT41 | 117 | 685 |
| Cambrian Consolidated Mines Ltd | Merionethshire | 1900 | BT31 | 9148 | 67795 | |
| Cambrian Copper Mining Company Ltd | Merionethshire | 1899 | BT31 | 16257 | 63463 | |
| Cambrian Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1877 | BT31 | 2339 | 11429 |
| Cambrian Prospecting Syndicate Ltd | 1888 | BT31 | 4270 | 27699 | ||
| Camp Floyd Silver Mining Co. Ltd | Utah | U.S.A. | 1871 | BT31 | 1652 | 5765 |
| Canada Del Oro Mines Ltd | 1891 | BT31 | 5185 | 35061 | ||
| Canadian & British Columbia Prospecting Syndicate Ltd | 1898 | BT31 | 7910 | 56694 | ||
| Canadian & North West Land & Mining Co. Ltd | 1868 | BT31 | 1406 | 4020 | ||
| Canadian Consolidated Mines Ltd | 1897 | BT31 | 7261 | 51366 | ||
| Canadian Lead Mining & Smelting Co. Ltd | 1874 | BT31 | 1935 | 8037 | ||
| Canadian Mines Development Co. Ltd | 1899 | BT31 | 8462 | 61585 | ||
| Canadian Mines Syndicate Ltd | 1891 | BT31 | 5220 | 35416 | ||
| Canadian Mining Corporation Ltd | 1914 | BT31 | 22126 | 134525 | ||
| Canadian Mining Corporation Ltd | 1923 | BT31 | 28118 | 192749 | ||
| Canadian Pacific Prospecting & Mining Co. Ltd | 1889 | BT31 | 4458 | 29059 | ||
| Canadian Prospecting Syndicate Ltd | 1905 | BT31 | 11294 | 86391 | ||
| Canas Mines Ltd | 1896 | BT31 | 7172 | 50648 | ||
| Candelaria Land Mining & Power Co. Ltd | 1911 | BT31 | 13564 | 115019 | ||
| Cantabrian Copper Mines Ltd | 1888 | BT31 | 4183 | 27040 | ||
| Cantabrian Copper Mines Ltd | 1890 | BT31 | 4658 | 30625 | ||
| Cape Copper Mining Co. Ltd | South Africa | 1863 | BT31 | 730 | 184C | |
| Cape Cornwall St Just Consolidated Tin & Copper Mining Co. Ltd | St Just | Cornwall | 1864 | BT286 | 49 | |
| Cape Manganese Mines Ltd | 1882 | BT31 | 3000 | 16898 | ||
| Cape of Good Hope Copper Mining Co. Ltd | South Africa | 1863 | BT31 | 726 | 162C | |
| Cape of Good Hope Diamond Mining Co. Ltd | South Africa | 1881 | BT31 | 2792 | 15265 | |
| Capel Banhaglog or East Mid Wales Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1868 | BT31 | 1390 | 3908 |
| Cappagh Mining Co. Ltd | Co. Cork, Schull | Ireland | 1862 | BT31 | 642 | 2694 |
| Cappagh Mining Co. Ltd | Co. Cork, Schull | Ireland | 1870 | BT31 | 1507 | 4701 |
| Cappagh Mining Co. Ltd | Co. Cork, Schull | Ireland | 1862 | BT31 | 642 | 2694 |
| Capula Silver Mining Co. Ltd | Mexico | 1862 | BT31 | 609 | 2555 | |
| Caracoles Silver Mining Co. Ltd | Bolivia | 1873 | BT31 | 1878 | 7463 | |
| Caradon & Phoenix Consols Mining Co. Ltd | North Hill | Cornwall | 1892 | BT286 | 160 | |
| Caradon & Phoenix Consols Mining Co. Ltd | North Hill | Cornwall | 1864 | BT286 | 41 | |
| Caradons Ltd | Cornwall | 1907 | BT31 | 12179 | 95599 | |
| Caratal (New) Mines Ltd | 1896 | BT31 | 7018 | 49439 | ||
| Caratal (New) Mines Ltd | 1902 | BT31 | 9738 | 72533 | ||
| Carbajosa Tin Mining Syndicate Ltd | 1913 | BT31 | 14069 | 127309 | ||
| Carden Mining Co. Ltd | 1873 | BT31 | 1856 | 7301 | ||
| Cardigan Bay Consols Mining Co. Ltd | Taliesin | Cardiganshire | 1870 | BT31 | 1506 | 4695 |
| Cardigan Mines Ltd | Cardiganshire | 1906 | BT31 | 17939 | 91125 | |
| Cardigan South Bog Silver Lead Mining Co. Ltd | Strata Florida | Cardiganshire | BT41 | 123 | 728 | |
| Cardigan South Bog Silver Lead Mining Co. Ltd | Strata Florida | Cardiganshire | 1857 | BT31 | 256 | 845 |
| Cardigan Syndicate Ltd | Cardiganshire | 1900 | BT31 | 8912 | 65659 | |
| Cardigan United Lead Mining Co. Ltd | Llanfihangel-y-Crwidden | Cardiganshire | 1875 | BT31 | 2066 | 9121 |
| Cardigan United Mines Ltd | Llanfihangel-y-Crwidden | Cardiganshire | 1886 | BT31 | 3749 | 23367 |
| Cardiganshire Consolidated Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1898 | BT31 | 7858 | 56268 |
| Cardiganshire Consolidated Mining Co. Ltd | Tal-y-bont | Cardiganshire | BT41 | 123 | 729 | |
| Cardiganshire Consolidated Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1858 | BT31 | 330 | 1174 |
| Cardiganshire Lead Mines Co. Ltd | Cardiganshire | 1865 | BT31 | 1156 | 2446C | |
| Cardiganshire Mineral Corporation Ltd | Cardiganshire | 1882 | BT31 | 3020 | 17071 | |
| Cardiganshire Mining Association | Cardiganshire | 1851 | BT41 | 123 | 730 | |
| Cardiganshire Mining Co. Ltd | Cardiganshire | 1877 | BT31 | 2304 | 11137 | |
| Cardiganshire Old Bog Mine Ltd | Llanbadarnfawr | Cardiganshire | 1871 | BT31 | 1654 | 5774 |
| Cardinal Prospecting Syndicate Ltd | 1910 | BT31 | 32052 | 108184 | ||
| Cardinham Silver Lead Mining Co. Ltd | Cardinham | Cornwall | 1872 | BT286 | 312 | |
| Cardinham Vale Silver Lead Mining Co. Ltd | Cardinham | Cornwall | 1875 | BT286 | 406 | |
| Cariboo Mining Syndicate Ltd | 1910 | BT31 | 32080 | 112791 | ||
| Cariggan Rock Tin Mining Co. Ltd | Bugle | Cornwall | 1874 | BT286 | 358 | |
| Carleen Vor & West Wheal Metal Tin & Copper Mines Co. Ltd | Breage | Cornwall | 1875 | BT286 | 396 | |
| Carlingford Harbour Quarries Ltd | Ireland | 1908 | BT31 | 12422 | 98418 | |
| Carmarthen Lead Mining Syndicate Ltd | Llangunnor | Carmarthenshire | 1890 | BT31 | 4833 | 32048 |
| Carmarthen Silver Lead Mining Co. Ltd | Llanboidy | Carmarthenshire | 1871 | BT31 | 1638 | 5630 |
| Carmarthen United Lead Mining Co. Ltd | Llanboidy | Carmarthenshire | 1858 | BT31 | 319 | 1120 |
| Carmarthen United Lead Mining Co. Ltd | Llanboidy | Carmarthenshire | BT41 | 126 | 739 | |
| Carmen Copper Mines Ltd | 1900 | BT31 | 8985 | 66403 | ||
| Carn Brea & Tincroft Mines Ltd | Camborne | Cornwall | 1896 | BT31 | 6845 | 48158 |
| Carn Camborne Tin & Copper Mining Co. Ltd | Camborne | Cornwall | 1881 | BT31 | 2809 | 15385 |
| Carn Camborne Tin & Copper Mining Co. Ltd | Camborne | Cornwall | 1881 | BT31 | 2880 | 15928 |
| Carn Down Tin & Copper Mining Co. Ltd | Camborne | Cornwall | 1873 | BT286 | 328 | |
| Carn Galver Tin Mining Co. Ltd | Morvah and Zennor | Cornwall | 1871 | BT286 | 233 | |
| Carnaquidden Mining Co. Ltd | Gulval | Cornwall | 1909 | BT31 | 12757 | 102723 |
| Carnarvon Copper Mining Co. Ltd | Llanllyfin | Caernarvonshire | 1880 | BT31 | 2598 | 13680 |
| Carnarvonshire Consolidated Lead Mines Co. Ltd | Trefriw | Caernarvonshire | 1866 | BT31 | 1293 | 3277 |
| Carnarvonshire Freehold Copper Mining Co | Conwy | Caernarvonshire | 1888 | BT31 | 4135 | 26661 |
| Carnarvonshire Great Consols Lead Mining Co. Ltd | Llanrwst | Caernarvonshire | 1881 | BT31 | 2830 | 15545 |
| Carnon Valley (Cornwall) Ltd | Carnnon Valley & Restronguet Creek | Cornwall | 1913 | BT31 | 21472 | 129107 |
| Carolina Mining Co. Ltd | 1878 | BT31 | 2416 | 12146 | ||
| Carpella Consols Ltd | St Austell | Cornwall | 1882 | BT31 | 2949 | 16499 |
| Carr Mine & Colorado Co. Ltd | 1900 | BT31 | 9044 | 66890 | ||
| Carranza-Lafone Copper Mining & Smelting Corporation Ltd | 1900 | BT31 | 8924 | 65802 | ||
| Carreg Fawr Slate & Mineral Co. Ltd | Wales | 1860 | BT31 | 479 | 1872 | |
| Carrizal Mines Ltd | 1898 | BT31 | 7968 | 57226 | ||
| Carrock Mines Ltd | Troutbeck | Cumberland | 1904 | BT31 | 10715 | 81202 |
| Carson De Beer Wolfram Co. Ltd | 1899 | BT31 | 8659 | 63151 | ||
| Cartago Ltd | Venezuela | 1884 | BT31 | 3281 | 19344 | |
| Carupano Mining Co. Ltd | 1869 | BT31 | 1478 | 4512 | ||
| Casara Lead Mine Co. Ltd | Llangadock | Carmarthenshire | 1860 | BT41 | 127 | 747 |
| Casara Lead Mine Co. Ltd | Llangadock | Carmarthenshire | 1860 | BT31 | 471 | 1828 |
| Casey Cobalt Mining Co. Ltd | 1907 | BT31 | 18061 | 92923 | ||
| Cashwell Lead Mining Co. Ltd | Garrigill | Cumberland | 1865 | BT31 | 1145 | 2380C |
| Cassel Cyanide Co. Ltd | 1884-1894 | BT2 | 1418 | |||
| Castell Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1857 | BT31 | 234 | 749 |
| Castell Lead Mining Co. Ltd | Pontwrwyd | Cardiganshire | BT41 | 127 | 748 | |
| Castell Mining Co. Ltd | Ponterwyd | Cardiganshire | 1893 | BT31 | 5714 | 39951 |
| Castellon Zinc Mines Ltd | 1900 | BT31 | 9110 | 67450 | ||
| Castilian Mining Co | BT41 | 127 | 749 | |||
| Castilian Mining Co. Ltd | 1856 | BT31 | 169 | 512 | ||
| Castillon (Pyrenees) Mining Co. Ltd | France | 1886 | BT31 | 3657 | 22626 | |
| Castle an Dinas Tin Mining Co. Ltd | St Colomb Major | Cornwall | 1870 | BT286 | 206 | |
| Castle Gate Tin Mining Co. Ltd | St Columb | Cornwall | 1872 | BT286 | 260 | |
| Castleton & Silver Craig Mining Co. Ltd | Kilmichael Glassary | Argyllshire | 1861-1867 | BT2 | 85 | |
| Castletown Copper Mining Co. Ltd | Co. Cork, Bawneeshall | Ireland | 1857 | BT31 | 220 | 692 |
| Castletown Copper Mining Co. Ltd | Co. Cork | Ireland | BT41 | 130 | 760 | |
| Castletown New Copper Mining Co. Ltd | Co. Cork, Bawneeshall | Ireland | BT41 | 130 | 761 | |
| Castletown New Copper Mining Co. Ltd | Co. Cork, Bawneeshall | Ireland | 1859 | BT31 | 426 | 1646 |
| Cat Holes Mine Co. Ltd | Todmorden | Yorkshire | 1871 | BT31 | 1639 | 5641 |
| Cataluna Mining Co. Ltd | 1919 | BT31 | 24985 | 158498 | ||
| Cathedral Tin & Copper Mining Co. Ltd | Gwennap | Cornwall | 1871 | BT286 | 238 | |
| Catherine & Jane Lead Mining Co. Ltd | Dolgellau | Merionethshire | 1873 | BT31 | 1820 | 7043 |
| Caucasus Silver Lead Mines Ltd | 1906 | BT31 | 11413 | 87658 | ||
| Cawsand Vale Copper Mining Co. Ltd | Devon | 1869 | BT286 | 173 | ||
| Caylloma Silver Mining Co. Ltd | Peru | 1890 | BT31 | 4650 | 30572 | |
| Cayo Silver Lead Mining Co. Ltd | Cayo | Carmarthenshire | 1874 | BT31 | 2044 | 8921 |
| Cazalla Mining Co. Ltd | 1909 | BT31 | 12657 | 101481 | ||
| Ceevee Silver Lead Mines Ltd | 1913 | BT31 | 21917 | 132826 | ||
| Cefn Brwyno Mining Co. Ltd | Goginan | Cardiganshire | 1867 | BT31 | 1368 | 3755 |
| Cefn Cilcen Mining Co. Ltd | Mold | Flintshire | 1860 | BT31 | 499 | 1977 |
| Cefn Cilcen Mining Co. Ltd | Cilcain | Flintshire | BT41 | 133 | 769 | |
| Cefn Consols Lead Mining Co. Ltd | Denbighshire | 1870 | BT31 | 1515 | 4744 | |
| Cefn Cwm Brwymo Mines Co. Ltd | Goginan | Cardiganshire | 1858 | BT31 | 347 | 1256 |
| Cefn Cwm Brwyno Mines Co. Ltd | Goginan | Cardiganshire | BT41 | 133 | 771 | |
| Cefn Hafod & South Dyliffe Silver Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1872 | BT31 | 1715 | 6232 |
| Cefn y Guntla Mine Ltd | More | Shropshire | 1872 | BT31 | 1676 | 5946 |
| Cefn y Maes Lead Mining Co. Ltd | Denbighshire | 1879 | BT31 | 2547 | 13252 | |
| Celia Consolidated Mines Ltd | 1885 | BT31 | 3452 | 20877 | ||
| Celtic Granite Company Ltd | Ireland | 1911 | BT31 | 20372 | 119276 | |
| Celyn Bog Silver Lead Mining Co. Ltd | Whitford | Flintshire | 1872 | BT31 | 1709 | 6184 |
| Centenillo Silver Lead Mines Co. Ltd | 1886 | BT31 | 3768 | 23508 | ||
| Central American Estates & Mining Development Co. Ltd | 1919 | BT31 | 32275 | 153938 | ||
| Central American Mining Co | BT41 | 133 | 773 | |||
| Central American Mining Co. Ltd | Guatemala | 1866 | BT31 | 1250 | 2997 | |
| Central Argentine (Carpa Valley) Exploration Co. Ltd | Argentina | 1888 | BT31 | 4036 | 25735 | |
| Central Aspen Silver Mining Co. Ltd | Colorado | U.S.A. | 1891 | BT31 | 5049 | 33910 |
| Central City (Colorado) Mining Co. Ltd | 1873 | BT31 | 1855 | 7295 | ||
| Central City Mining Co. Ltd | 1871 | BT31 | 1618 | 5488 | ||
| Central Consolidated Tin Mining & Exploration Co. Ltd | 1913 | BT31 | 14092 | 128283 | ||
| Central Diamond Mining Co: Kimberley Mine Ltd | 1885 | BT31 | 3462 | 20955 | ||
| Central Foxdale Silver Lead Mining Co. Ltd | Foxdale | Isle of Man | 1875 | BT31 | 2070 | 9166 |
| Central Foxdale Silver Lead Mining Co. Ltd | Foxdale | Isle of Man | 1887 | BT31 | 3948 | 25034 |
| Central Grylls Mining Co. Ltd | St Hilary | Cornwall | 1864 | BT286 | 35 | |
| Central Halkyn Mine Ltd | Holywell | Flintshire | 1909 | BT31 | 12712 | 102131 |
| Central Halkyn Mining Co. Ltd | Holywell | Flintshire | 1899 | BT31 | 8583 | 62496 |
| Central Italian Copper Mining Co. Ltd | Italy | 1856 | BT41 | 134 | 777 | |
| Central Jagersfontein Diamond Mining Co. Ltd | 1881 | BT31 | 2793 | 15269 | ||
| Central Minera Lead Mining Co. Ltd | Minera | Denbighshire | BT41 | 135 | 780 | |
| Central Minera Lead Mining Co. Ltd | Minera | Denbighshire | 1859 | BT31 | 404 | 1541 |
| Central Mining Co. of Dorstfontein Ltd | 1880 | BT31 | 2689 | 14444 | ||
| Central Provinces Mining Co. Ltd | 1925 | BT31 | 29340 | 210275 | ||
| Central Snailbeach Mining Co. Ltd | Minsterley | Shropshire | 1862 | BT31 | 611 | 2567 |
| Central Van Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1871 | BT31 | 1670 | 5918 |
| Cerro Blanco Mines Ltd | 1888 | BT31 | 4096 | 26283 | ||
| Cerro Del Bote Mining Co | Mexico | 1849 | BT41 | 135 | 782 | |
| Cerro Muriano Mines Limited | Cordoba | Spain | 1903 | BT31 | 10289 | 77283 |
| Cervantes Silver Mines Ltd | 1884 | BT31 | 3319 | 19673 | ||
| Cevreni-Breg Mining Co. Ltd | 1906 | BT31 | 17661 | 87345 | ||
| Ceylon Land & Mining Co | Ceylon | 1853 | BT41 | 135 | 784 | |
| Ceylon Prospecting Syndicate Ltd | 1896 | BT31 | 6807 | 47888 | ||
| Champion Mining Co. Ltd | 1870 | BT31 | 1520 | 4775 | ||
| Champion Silver Lead & Copper Mining Co. Ltd | Newton Stewart | Kirkcudbrightshire | 1869 | BT31 | 1493 | 4617 |
| Chans Silver Lead Mining Co. Ltd | Portugal | 1871 | BT31 | 1649 | 5730 | |
| Charles Dickens Mining Co. Ltd | Idaho | U.S.A. | 1886 | BT31 | 3688 | 22927 |
| Charlotte United Mines Ltd | St Agnes | Cornwall | 1876 | BT286 | 424 | |
| Charter Oak Copper Mines Ltd | Michigan | U.S.A. | 1898 | BT31 | 8038 | 57890 |
| Chartley & Fradley Mining & Manufacturing Co. Ltd | Staffordshire | 1872 | BT31 | 1726 | 6321 | |
| Chemainus Mining & Smelting Co. Ltd | 1898 | BT31 | 8210 | 59451 | ||
| Cherez Copper Mining Co. Ltd | 1861 | BT31 | 562 | 2303 | ||
| Cheshire Copper Mines Co. Ltd | Cheshire | 1884 | BT31 | 3280 | 19327 | |
| Chiantla Mining Co | BT41 | 142 | 818 | |||
| Chicago Silver Mining Co. Ltd | Utah | U.S.A. | 1873 | BT31 | 1827 | 7093 |
| Chida (Wassaw) Mines Ltd | 1901 | BT31 | 9402 | 69838 | ||
| Chilean & Bolivian Mining Syndicate Ltd | Chile | 1906 | BT31 | 11675 | 90328 | |
| Chilian Manganese Mines Ltd | Chile | 1889 | BT31 | 4490 | 29328 | |
| Chilian Mining & Trading Co. Ltd | Chile | 1864 | BT31 | 961 | 1326C | |
| Chillaton Manganese Co. Ltd | Milton Abbot | Devon | 1891 | BT31 | 5012 | 33585 |
| Chinese Antimony Company Ltd | China | 1909 | BT31 | 12848 | 103996 | |
| Chirk Castle Lead Mining Co (1865) Ltd | Llanrhaeadr | Montgomeryshire | 1865 | BT31 | 1139 | 2342C |
| Chirk Castle Mining Co | Llanrhaeadr | Montgomeryshire | BT41 | 143 | 822 | |
| Chirk Castle Mining Co. Ltd | Llanrhaeadr | Montgomeryshire | 1856 | BT31 | 150 | 461 |
| Choco (Colombia) Mining Estates Ltd | Colombia | 1924 | BT31 | 28658 | 199850 | |
| Chontales Consolidated Mining Co. Ltd | Nicaragua | 1871 | BT31 | 1613 | 5455 | |
| Chontales Mines Ltd | Nicaragua | 1886 | BT31 | 3761 | 23451 | |
| Chovar Quicksilver Mines Ltd | 1889 | BT31 | 4484 | 29268 | ||
| Chrome Mines Co. Ltd | 1894 | BT31 | 6025 | 42556 | ||
| Church Burn Lead Mining Co. Ltd | Haltwhistle | Durham | 1879-1932 | BT2 | 915 | |
| Chyverton & Lambourne Castle Mining Co. Ltd | Zelah | Cornwall | 1924 | BT31 | 28674 | 200043 |
| Cilcenus Mining Co. Ltd | 1915 | BT31 | 23028 | 141959 | ||
| Cintilla Copper Mining Co. Ltd | 1912 | BT31 | 20931 | 124339 | ||
| City Mining & Rubber Co. Ltd | 1910 | BT31 | 13169 | 108628 | ||
| City of London Mines Agency Ltd | 1895 | BT31 | 6352 | 44873 | ||
| City Rock Silver Mining Co. Ltd | 1873 | BT31 | 1802 | 6897 | ||
| Ciudad-Real Lead Mines Co. Ltd | 1900 | BT31 | 9068 | 67107 | ||
| Claagsen Prospecting Syndicate Ltd | 1906 | BT31 | 11736 | 90960 | ||
| Clara Consols Silver Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1870 | BT31 | 1531 | 4850 |
| Clara Silver Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1857 | BT31 | 227 | 724 |
| Clara United Co. Ltd | Ponterwyd | Cardiganshire | 1861 | BT31 | 574 | 2367 |
| Clara United Co. Ltd | Ponterwyd | Cardiganshire | 1862 | BT31 | 710 | 75C |
| Clare Company Ltd | Ireland | 1908 | BT31 | 18341 | 96597 | |
| Clare Silver Lead Mining Co. Ltd | BT41 | 152 | 862 | |||
| Clarendon Consolidated Mining Co. | BT41 | 152 | 864 | |||
| Clarendon Consolidated Mining Co. of Jamaica Ltd | Jamaica | 1856 | BT31 | 143 | 446 | |
| Cleator Glebe Mining Co. Ltd | Cleator Moor | Cumberland | 1888 | BT31 | 4087 | 26208 |
| Clee Hill Mining & Development Co. Ltd | Doddington | Shropshire | 1922 | BT31 | 27236 | 182016 |
| Clee Hills Mining Co. Ltd | Doddington | Shropshire | 1866 | BT31 | 1226 | 2843C |
| Clementina Lead Mine Co. Ltd | Conwy | Caernarvonshire | 1876 | BT31 | 2275 | 10920 |
| Cleveland Iron Mines Ltd | 1880 | BT31 | 2626 | 13910 | ||
| Clew Bay General Mining Co. Ltd | Co. Mayo | Ireland | 1857 | BT41 | 154 | 870 |
| Clew Bay General Mining Co. Ltd | Co. Mayo | Ireland | 1857 | BT41 | 154 | 870 |
| Clew Bay General Mining Co. Ltd | Co. Mayo | Ireland | 1857 | BT31 | 264 | 884 |
| Clifford Amalgamated Mines Ltd | Gwennap | Cornwall | 1882 | BT31 | 3078 | 17587 |
| Clifton Arizona Copper Co. Ltd | Arizona | U.S.A. | 1900 | BT31 | 9252 | 68711 |
| Clifton Consolidated Copper Mines of Arizona Ltd | Arizona | U.S.A. | 1901 | BT31 | 9480 | 70416 |
| Clifton Consolidated Copper Mines of Arizona Ltd | Arizona | U.S.A. | 1901 | BT31 | 9480 | 70416 |
| Clifton Iron Co. Ltd | 1878 | BT31 | 2476 | 12678 | ||
| Clifton Ironworks Ltd | 1933 | BT31 | 33481 | 282838 | ||
| Clifton Silver Mining Co. Ltd | Colorado | U.S.A. | 1871 | BT31 | 1627 | 5550 |
| Clifton Tinto Copper Mines Ltd | 1895 | BT31 | 6505 | 45787 | ||
| Clifton Tinto Copper Mines Ltd | 1895 | BT31 | 6505 | 45787 | ||
| Clipper Mine Syndicate Ltd | 1888 | BT31 | 4208 | 27232 | ||
| Clitters United Mines Ltd | Hingston | Cornwall | 1900 | BT31 | 9124 | 67561 |
| Clive Copper Mining Co. Ltd | Grinshill | Shropshire | 1862 | BT31 | 716 | 110C |
| Clogau Co. Ltd | Llanaber | Merionethshire | 1874 | BT31 | 1980 | 8462 |
| Clogau Mining Co. Ltd | Llanaber | Merionethshire | 1880 | BT31 | 2681 | 14356 |
| Cloncurry Copper Mining Co. Ltd | 1868 | BT31 | 1411 | 4061 | ||
| Clowance Wood Mining Co. Ltd | Crowan | Cornwall | 1864 | BT31 | 901 | 1016C |
| Cluin Copper Development Syndicate Ltd | Ireland | 1904 | BT31 | 10804 | 81916 | |
| Cobalt Lake Silver Mining Co. Ltd | 1913 | BT31 | 21174 | 126628 | ||
| Cobalt Town Site Silver Mining Co. of Canada Ltd | 1906 | BT31 | 17881 | 90392 | ||
| Cockley Beck Mining Co. Ltd | Seathwaite | Lancashire | BT41 | 155 | 879 | |
| Cockley Beck Mining Co. Ltd | Seathwaite | Lancashire | 1858 | BT31 | 358 | 1308 |
| Coed Cynric Lead Mine Co. Ltd | Mold | Flintshire | BT41 | 155 | 880 | |
| Coed Cynric Lead Mine Co. Ltd | Mold | Flintshire | 1859 | BT31 | 385 | 1436 |
| Coed Mawr Pool & Fridd Lead Mining Co. Ltd | Trefriw | Caernarvonshire | 1881 | BT31 | 2877 | 15907 |
| Coed Mawr Pool Lead & Blende Mining Co. Ltd | Trefriw | Caernarvonshire | 1899 | BT31 | 8636 | 62968 |
| Coed Mawr Pool Lead Mining Co | Trefriw | Caernarvonshire | 1857 | BT31 | 285 | 974 |
| Coed y Fedw & Pant y Buarth Lead Co. Ltd | Llanferres | Denbighshire | 1881 | BT31 | 2736 | 14837 |
| Coimadai Antimony Mine Ltd | 1900 | BT31 | 8862 | 65180 | ||
| Coiro Lead Mining Co. Ltd | 1864 | BT31 | 1021 | 1663C | ||
| Colado Boy Silver Mines Ltd | 1891 | BT31 | 5101 | 34347 | ||
| Colar Concessionaires Co. Ltd | India | 1881 | BT31 | 2896 | 16085 | |
| Colby Mining Co. Ltd | Colby | Isle of Man | 1873 | BT31 | 1827 | 7094 |
| Colcharton Copper Mining Co. Ltd | Tavistock | Devon | 1867 | BT286 | 151 | |
| Collacombe Down Copper Mining Co. Ltd | Sydenham Damerel | Devon | 1870 | BT286 | 185 | |
| College Mines Co. Ltd | Ireland | 1856 | BT31 | 96 | 339 | |
| College Mines Co. Ltd | Ireland | 1856 | BT41 | 156 | 888 | |
| Collis-Griffith Prospecting Syndicate Ltd | 1906 | BT31 | 11688 | 90481 | ||
| Colombia & North West Mines Development Syndicate Ltd | Colombia | 1898 | BT31 | 7942 | 57001 | |
| Colombia Cinnabar & General Mining Co.Ltd | Colombia | 1911 | BT31 | 20138 | 116953 | |
| Colombia Smelting & Concessions Co. Ltd | Colombia | 1908 | BT31 | 18391 | 97351 | |
| Colombian Hydraulic Mining Co. Ltd | Colombia | 1907 | BT31 | 11996 | 93610 | |
| Colombian Hydraulic Mining Co. Ltd | Colombia | 1879 | BT31 | 2511 | 12965 | |
| Colombian Hydraulic Mining Co. Ltd | Colombia | 1903 | BT31 | 10165 | 76219 | |
| Colonial Farms & Mines Syndicate Ltd | 1903 | BT31 | 10205 | 76538 | ||
| Colonial Mines & Contract Corpn. Ltd | 1895 | BT31 | 6114 | 43305 | ||
| Colonial Mines Finance Corporation Ltd | 1897 | BT31 | 7234 | 51151 | ||
| Colonial Mines Issuing Syndicate Ltd | 1896 | BT31 | 6772 | 47657 | ||
| Colonial Prospecting Co. Ltd | 1888 | BT31 | 4209 | 27235 | ||
| Colorado Highland Mining Co. Ltd | 1871 | BT31 | 1604 | 5390 | ||
| Colorado Mines Development Co. Ltd | 1882 | BT31 | 2938 | 16415 | ||
| Colorado Mining & Land Co. Ltd | 1870 | BT31 | 1553 | 5003 | ||
| Colorado Mining Syndicate Ltd | 1911 | BT31 | 20073 | 116307 | ||
| Colorado Prospecting Co. Ltd | 1891 | BT31 | 5042 | 33844 | ||
| Colorado United Mining Co. Ltd | 1870 | BT31 | 1524 | 4804 | ||
| Colossus Silver Lead Ore Co. Ltd | Halkyn | Flintshire | 1888 | BT31 | 4116 | 26457 |
| Coltness Iron Co. Ltd | Coltness | Lanarkshire | 1881-1900 | BT2 | 1046 | |
| Columbian Mining & Exploration Co. Ltd | 1908 | BT31 | 42481 | 96963 | ||
| Colville Co. Ltd | New Zealand | 1887 | BT31 | 3957 | 25107 | |
| Combe Molton Silver Lead Mining Co. Ltd | South Molton | Devon | 1874 | BT286 | 390 | |
| Combellack Mining Co. Ltd | Wendron | Cornwall | 1875 | BT286 | 405 | |
| Combmartin & North Devon Smelting Co. | Combe Martin | Devon | BT41 | 158 | 902 | |
| Combmartin Silver Lead Mining Co. Ltd | Combe Martin | Devon | 1874 | BT286 | 369 | |
| Commerce Tin Mine Ltd | St Austell | Cornwall | 1900 | BT31 | 8994 | 66484 |
| Commercial & Mining Co. Ltd | 1908 | BT31 | 31996 | 98223 | ||
| Commercial Prospection Co. Ltd | 1937 | BT31 | 33710 | 327127 | ||
| Commonwealth Mining & Finance Ltd | 1934 | BT31 | 38500 | 287961 | ||
| Commonwealth Prospecting Syndicate Ltd | 1904 | BT31 | 17210 | 80541 | ||
| Compagnie Des Mines D’or (Brown’s Creek) Ltd | 1894 | BT31 | 5929 | 41715 | ||
| Compagnie Generale des Petroles Mines et Canaux de Piura-Perou Ltd | 1894 | BT31 | 5996 | 42307 | ||
| Compania Minera De Mexico Ltd | Mexico | 1900 | BT31 | 9010 | 66651 | |
| Company of Proprietors of the Royal Copper Mines of Cobre Ltd | Cuba | 1866 | BT31 | 1310 | 3371 | |
| Comstock Mines (British Columbia) Ltd | 1897 | BT31 | 7456 | 52990 | ||
| Comstock Mining Co. Ltd | Utah | U.S.A. | 1888 | BT31 | 4063 | 25976 |
| Concordia Consolidated Mines Co. Ltd | 1899 | BT31 | 8705 | 63572 | ||
| Concordia Consolidated Mines Co. Ltd | 1896 | BT31 | 6648 | 46750 | ||
| Concordia Tin Mine of Bolivia Ltd | 1906 | BT31 | 11631 | 89883 | ||
| Condesa Calamine Mines Ltd | 1893 | BT31 | 5605 | 39031 | ||
| Condurrow United Mines Ltd | Camborne | Cornwall | 1906 | BT31 | 11434 | 87885 |
| Coniston & Tilberwaite Mining Co. Ltd | Coniston | Lancashire | 1874 | BT31 | 1949 | 8188 |
| Coniston Electrolytic Copper Works Ltd | Coniston | Lancashire | 1913 | BT31 | 21188 | 126747 |
| Coniston Mining Syndicate Ltd | Coniston | Lancashire | 1892 | BT31 | 5282 | 36054 |
| Conistone Moor Head Lead Mining Co. Ltd | Conistone with Kilnsey | Yorkshire | 1869 | BT31 | 1460 | 4391 |
| Connaught Copper Mining Co. Ltd | Ireland | 1884 | BT31 | 3278 | 19304 | |
| Connaught Granite Quarries Ltd | Ireland | 1896 | BT31 | 7027 | 49502 | |
| Connaught Mining Syndicate of Rhodesia Ltd | 1911 | BT31 | 13490 | 113562 | ||
| Connaught Trading & Mining Co. Ltd | Ireland | 1900 | BT31 | 9024 | 66769 | |
| Connemara Green Marble Quarries Ltd | Ireland | 1911 | BT31 | 20124 | 116817 | |
| Connemara Mining Co of Ireland | Ireland | 1852 | BT41 | 162 | 918 | |
| Connemara Mining Co. Ltd | Ireland | 1912 | BT31 | 20733 | 122598 | |
| Connolly Mine Ltd | Nevada | U.S.A. | 1879 | BT31 | 2508 | 12942 |
| Connorree Mining Co. Ltd | Co. Wicklow, Ovoca | Ireland | 1859 | BT31 | 415 | 1597 |
| Connorree Mining Co. Ltd | Co. Wicklow, Ovoca | Ireland | 1859 | BT41 | 162 | 919 |
| Conrad Stannite Mines Ltd | 1906 | BT31 | 11407 | 87584 | ||
| Conroy Lead Mines Co. Ltd | Machynlleth | Montgomeryshire | 1870 | BT31 | 1570 | 5127 |
| Consall Mining Co. Ltd | 1923 | BT31 | 27760 | 188074 | ||
| Consolidated Broken Hill Silver Mining Co. Ltd | New South Wales | Australia | 1889 | BT31 | 4350 | 28251 |
| Consolidated Estates & Mines of South Africa Ltd | 1901 | BT31 | 9591 | 71270 | ||
| Consolidated General Mining Co. Ltd | 1872 | BT31 | 1721 | 6287 | ||
| Consolidated Investment & Mining Corporation Ltd | 1889 | BT31 | 4566 | 29903 | ||
| Consolidated Minera Lead Mining Co. Ltd | Minera | Denbighshire | 1874 | BT31 | 2054 | 9024 |
| Consolidated Mines Ltd | St Day | Cornwall | 1905 | BT31 | 10974 | 83384 |
| Consolidated Mining Co. Ltd | 1878 | BT31 | 2438 | 12366 | ||
| Consolidated Mining Co. of Nova Scotia Ltd | Nova Scotia | Canada | 1871 | BT31 | 1591 | 5281 |
| Consolidated Tamar Mines Ltd | Kelly & Calstock | Cornwall | 1910 | BT31 | 19251 | 107726 |
| Consolidated Tin Smelting Co. Ltd | Truro | Cornwall | 1891 | BT31 | 5096 | 34311 |
| Consolidated Zinc and Lead Mines, Ltd | 1917 | BT31 | 23812 | 148387 | ||
| Consort Prospecting & Developing Syndicate Ltd | 1889 | BT31 | 4394 | 28558 | ||
| Constancia Lead Mining Co. Ltd | 1858 | BT31 | 335 | 1192 | ||
| Constancia Lead Mining Co. Ltd | BT41 | 164 | 927 | |||
| Constante Silver Mines Co. Ltd | 1864 | BT31 | 974 | 1404C | ||
| Constantine Copper Syndicate | Cornwall | 1907 | BT31 | 11917 | 92833 | |
| Continental Mining Co. Ltd | 1965 | BT31 | 44491 | 857337 | ||
| Continuous Reaction Co. Ltd | Scorrier, Parc-an-Chy | Cornwall | 1913 | BT31 | 21523 | 129540 |
| Conway Valley Freehold Mining Co. Ltd | Conwy | Caernarvonshire | 1882 | BT31 | 3012 | 17010 |
| Cookson Lead and Antimony Co. Ltd | 1924 | BT31 | 36065 | 202376 | ||
| Coolartra & Bond Silver Lead Mining Co. Ltd | Co. Monaghan, Castleblaney | Ireland | 1862-1881 | BT2 | 119 | |
| Coolgardie Mines Issuing Syndicate Ltd | Australis | 1894 | BT31 | 5983 | 42203 | |
| Coombe & Danescombe Arsenic Co. Ltd | Devon | 1896 | BT31 | 6963 | 49029 | |
| Coombe Ltd | Cornwall | 1887 | BT31 | 3823 | 24009 | |
| Coombes Dry Mining Syndicate Ltd | Devon | 1896 | BT31 | 7028 | 49516 | |
| Cooney Proprietary Mines Ltd | 1897 | BT31 | 7588 | 54147 | ||
| Coosheen Copper Mining Co. | Co. Cork, Schull | Ireland | 1856 | BT31 | 53 | 213 |
| Coosheen Copper Mining Co. Ltd | Co. Cork, Schull | Ireland | 1853 | BT41 | 165 | 939 |
| Coosheen Copper Mining Co. Ltd | Co. Cork, Schull | Ireland | 1887 | BT31 | 3987 | 25351 |
| Coosheen Minerals Ltd | Co. Cork, Schull | Ireland | 1906 | BT31 | 11511 | 88720 |
| Copiapo Mining Co. Ltd | 1911 | BT31 | 13629 | 116212 | ||
| Copiapo Mining Co. Ltd | 1861 | BT31 | 551 | 2238 | ||
| Copiapo Smelting Co. Ltd | 1857 | BT31 | 283 | 965 | ||
| Copiapo Smelting Co. Ltd | BT41 | 166 | 942 | |||
| Copper & General Mining Co of Nelson New Zealand | New Zealand | BT41 | 166 | 943 | ||
| Copper Cliff Mines of Montana Ltd | Montana | U.S.A. | 1903 | BT31 | 10422 | 78533 |
| Copper Lead & Hematite Mining Co. of Lanzi: Tuscany Ltd | 1874 | BT31 | 2057 | 9057 | ||
| Copper Mines Co. of South Australia | 1862 | BT31 | 716 | 108C | ||
| Copper Mines of Mount Lyell West Ltd | 1897 | BT31 | 7609 | 54323 | ||
| Copper Mines of Spain Syndicate Ltd | 1904 | BT31 | 10912 | 82806 | ||
| Copper Mines of Tibet Ltd | 1904 | BT31 | 10757 | 81539 | ||
| Copper Queen Ltd | Cornwall | 1899 | BT31 | 8490 | 61798 | |
| Copper Queen Ltd | Cornwall | 1884 | BT31 | 3382 | 20210 | |
| Copper Queen United Ltd | Arizona | U.S.A. | 1885 | BT31 | 3441 | 20767 |
| Cordelio Mining Syndicate Ltd | 1911 | BT31 | 13693 | 117520 | ||
| Corderoy Mines Ltd | Lambriggan | Cornwall | 1927 | BT31 | 40688 | 195426 |
| Cordoba Copper Company Ltd | Cordoba | Spain | 1908 | BT31 | 18512 | 99101 |
| Cordoba Silver-Lead Mines Co. Ltd | Cordoba | Spain | 1890-1929 | BT2 | 2022 | |
| Cordova Lead Mines Ltd | Cordoba | Spain | 1905 | BT31 | 11349 | 86926 |
| Cordova Mining & Exploration Co. Ltd | Cordoba | Spain | 1910 | BT31 | 13145 | 108307 |
| Corinth Mines Ltd | 1897 | BT31 | 7331 | 51938 | ||
| Cork Mineral Development Syndicate Ltd | Co. Cork | Ireland | 1903 | BT31 | 10337 | 77776 |
| Cornish Exploration Co. Ltd | Cornwall | 1912 | BT31 | 20970 | 124740 | |
| Cornish (Port Quin) Antimony Mine Syndicate | St Endellion | Cornwall | 1891 | BT31 | 4982 | 33315 |
| Cornish Consolidated Iron Mines Corporation Ltd | Cornwall | 1872 | BT286 | 267 | ||
| Cornish Consolidated Tin Mines Ltd | St Cleer | Cornwall | 1906 | BT31 | 11456 | 88131 |
| Cornish Development Co. Ltd | Cornwall | 1907 | BT31 | 11794 | 91536 | |
| Cornish Finance Syndicate Ltd | Cornwall | 1907 | BT31 | 18009 | 92171 | |
| Cornish Kaolin Co. Ltd | Bodmin | Cornwall | 1920 | BT31 | 32138 | 124901 |
| Cornish Mineral Burrows Ltd | Cornwall | 1918 | BT31 | 24006 | 150016 | |
| Cornish Minerals Ltd | Cornwall | 1907 | BT31 | 11808 | 91661 | |
| Cornish Minerals Trust Ltd | Cornwall | 1916 | BT31 | 23177 | 143126 | |
| Cornish Mines Ltd | St Agnes, Wheal Coates | Cornwall | 1909 | BT31 | 18988 | 104753 |
| Cornish Mining Development Corporation Ltd | Cornwall | 1895 | BT286 | 606 | ||
| Cornish Mining Development Corporation Ltd | Cornwall | 1895 | BT286 | 168 | ||
| Cornish Mining Trust Ltd | Cornwall | 1905 | BT31 | 11142 | 84950 | |
| Cornish Mundic Syndicate Ltd | Cornwall | 1893 | BT31 | 5552 | 38615 | |
| Cornish Ochre Co. Ltd | Cornwall | 1887 | BT31 | 3939 | 24963 | |
| Cornish Silver Lead Smelting Co. Ltd | Cornwall | 1872 | BT31 | 1698 | 6106 | |
| Cornish Tin Properties Ltd | Cornwall | 1906 | BT31 | 11583 | 89419 | |
| Cornish Tin Sands Ltd | Gwithian beach | Cornwall | 1912 | BT31 | 20957 | 124592 |
| Cornish Tin Syndicate Ltd | Cornwall | 1903 | BT31 | 17113 | 78760 | |
| Cornish Wolfram Mines Ltd | Scorrier, Parc-an-Chy | Cornwall | 1916 | BT31 | 23143 | 142860 |
| Cornubia Tin Co. Ltd | Roche | Cornwall | 1913 | BT31 | 21162 | 126520 |
| Cornubia Tin Mining Co | Roche | Cornwall | 1860 | BT41 | 166 | 950 |
| Cornubia Tin Mining Co. Ltd | Roche | Cornwall | 1860 | BT31 | 502 | 1987 |
| Cornubia Tin Mining Co. Ltd | Roche | Cornwall | 1865 | BT286 | 77 | – |
| Cornwall & Devon Iron Mines Corporation Ltd | Cornwall | 1871 | BT286 | 244 | ||
| Cornwall Antimony Mines Ltd | Cornwall | 1882 | BT31 | 3015 | 17035 | |
| Cornwall Arsenic Co. Ltd | Cornwall | 1920 | BT31 | 32444 | 169545 | |
| Cornwall Great Consolidated Lead & Copper Mining Co. Ltd | Calstock | Cornwall | 1858 | BT41 | 166 | 948 |
| Cornwall Great Consols Mining Co. Ltd | Callington | Cornwall | 1881 | BT286 | 525 | |
| Cornwall Great Consols Mining Unlimited Co | Callington | Cornwall | 1880 | BT286 | 513 | |
| Cornwall Iron Mining Co. Ltd | Cornwall | 1871 | BT286 | 228 | ||
| Cornwall Mines Supply Co. Ltd | Cornwall | 1891 | BT31 | 5001 | 33485 | |
| Cornwall Mines Syndicate Ltd | Cornwall | 1906 | BT31 | 11575 | 89348 | |
| Cornwall New Mining Co | St Ives | Cornwall | 1848 | BT41 | 166 | 949 |
| Cornwall Ochre Mines Ltd | Cornwall | 1899 | BT31 | 8581 | 62488 | |
| Cornwall Tailings Co. Ltd | Redruth, Carn Brea | Cornwall | 1910 | BT31 | 19174 | 106870 |
| Cornwall Tin & Copper Mining Co. Ltd | Cornwall | 1874 | BT286 | 379 | ||
| Coromandel (N.Z.) Exploration Syndicate Ltd | New Zealand | 1896 | BT31 | 6669 | 46897 | |
| Corona Main Lode Silver Mines Ltd | 1890 | BT31 | 4823 | 31985 | ||
| Corporation of South Australian Copper Mines Ltd | South Australia | Australia | 1880 | BT31 | 2716 | 14657 |
| Corsican Mining Co. Ltd | France | 1874 | BT31 | 2005 | 8634 | |
| Cortez Mines Ltd | Nevada | U.S.A. | 1888 | BT31 | 4232 | 27410 |
| Coryton Manganese Co. Ltd | Coryton | Devon | 1885 | BT31 | 3428 | 20639 |
| Coryton United Manganese Co. Ltd | Coryton | Devon | 1883 | BT31 | 3211 | 18730 |
| Cosmopolitan Proprietary | Altarnun | Cornwall | 1907 | BT31 | 16024 | 58206 |
| Costa Rica Mining Co. Ltd | Costa Rica | 1887 | BT31 | 14880 | 24932 | |
| Coto Fortuna Mining Co. Ltd | 1874 | BT31 | 1976 | 8427 | ||
| Council of West Australian Mine Owners | 1903 | BT31 | 17049 | 77656 | ||
| County Louth Granite Quarries Ltd | Co. Louth | Ireland | 1900 | BT31 | 9077 | 67182 |
| County Mayo Granite Syndicate Ltd | Co. Mayo | Ireland | 1892 | BT31 | 5427 | 37450 |
| Court Grange Silver Lead Mines Co. Ltd | Penrhyn-coch | Cardiganshire | 1873 | BT31 | 1821 | 7047 |
| Court Grange United Silver Lead Mining Co. Ltd | Penrhyn-coch | Cardiganshire | 1880 | BT31 | 2622 | 13884 |
| Cousheen Copper Mining Co. Ltd | Ireland | 1879 | BT31 | 2555 | 13313 | |
| Cove Copper Mines Ltd | Ireland | 1907 | BT31 | 12235 | 96212 | |
| Craddock Moor Tin & Copper Mines Ltd | St Cleer | Cornwall | 1912 | BT31 | 13962 | 123821 |
| Crafnant & Devon Mining Syndicate Ltd | Merionethshire | 1918 | BT31 | 24146 | 151158 | |
| Crafnant Valley Lead & Zinc Mining Syndicate Ltd | Merionethshire | 1915 | BT31 | 22673 | 139036 | |
| Craig Ddu Slate Co. Ltd | Pen-y-bont-fawr | Montgomeryshire | 1880 | BT31 | 2670 | 14231 |
| Craig y Mowyn Lead Mining Co. Ltd | Wales | 1868 | BT31 | 1435 | 4219 | |
| Craignant Bach Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1881 | BT31 | 2798 | 15317 |
| Craigton Mines Co. Ltd | Newton Stewart | Kirkcudbrightshire | 1859 | BT31 | 409 | 1571 |
| Craigton Mines Co. Ltd | Newton Stewart | Kirkcudbrightshire | 1859 | BT41 | 172 | 981 |
| Craven Moor Mining Co | Appletreewick | Yorkshire | BT41 | 173 | 982 | |
| Craven Moor Mining Co. Ltd | Appletreewick | Yorkshire | 1856 | BT31 | 201 | 611 |
| Craven Moor United Lead Mining Co | Appletreewick | Yorkshire | 1884 | BT31 | 3376 | 20159 |
| Crawshaw & Warburton Ltd | Dewsbury | Yorkshire | 1900 | BT31 | 36847 | 66229 |
| Creetown Mining Co. Ltd | Newton Stewart | Kirkcudbrightshire | 1862-1881 | BT2 | 95 | |
| Creevlea Iron Co. Ltd | Ireland | 1861 | BT31 | 578 | 2392 | |
| Creglaze Ltd | Cornwall | 1889 | BT31 | 4422 | 28770 | |
| Creigiog Mining Co. Ltd | Llanarmon | Denbighshire | 1883 | BT31 | 3101 | 17781 |
| Crenver & Wheal Abraham United Mines Co. Ltd | Wendron | Cornwall | 1870 | BT286 | 187 | |
| Crenver & Wheal Abraham United Mines Co. Ltd | Wendron | Cornwall | 1870 | BT286 | 188 | |
| Crenver & Wheal Abraham United Mining Co. Ltd | Wendron | Cornwall | 1863 | BT286 | 27 | |
| Crescent & Nyanza Silver Mines Co. Ltd | 1871 | BT31 | 1626 | 5547 | ||
| Crickheath Lead & Copper Mining Co. Ltd | Oswestry | Shropshire | 1874 | BT31 | 2043 | 8909 |
| Criddis Copper Mining Co. Ltd | Little Petherick | Cornwall | 1864 | BT286 | 63 | |
| Cripple Creek Mines Ltd | 1896 | BT31 | 6636 | 46689 | ||
| Cristy Mines Ltd | 1903 | BT31 | 10391 | 78252 | ||
| Crofton Mining Co. Ltd | Westmorland | 1876 | BT31 | 2234 | 10590 | |
| Croghan Mining Co. Ltd | Ireland | 1863 | BT31 | 800 | 533C | |
| Cromford Mining & Minerals Co. Ltd | Cromford | Derbyshire | 1918 | BT31 | 24180 | 151445 |
| Crommelin Mining Co. Ltd | Ireland | 1888 | BT31 | 31085 | 25661 | |
| Crookburn Mining Co. Ltd | Alston with Garrigill | Cumberland | 1879 | BT31 | 2532 | 13126 |
| Crooke’s Mining & Smelting Co. Ltd | Colorado | U.S.A. | 1882 | BT31 | 2969 | 16664 |
| Crookhaven Mining Co. Ltd | Co. Cork, Kilmoe | Ireland | 1859 | BT41 | 174 | 986 |
| Crookhaven Mining Co. Ltd | Co. Cork, Kilmoe | Ireland | 1859 | BT31 | 419 | 1616 |
| Crossac Mining Co. Ltd | 1873 | BT31 | 1879 | 7474 | ||
| Crosswood Mining Lands Co. Ltd | 1878 | BT31 | 2450 | 12464 | ||
| Crowan & Wendron Tin & Copper Mining Co. Ltd | Crowan and Wendron | Cornwall | 1862 | BT31 | 678 | 2891 |
| Crowan Consols Copper Mining Co | Crowan | Cornwall | 1862 | BT31 | 657 | 2774 |
| Crown Mining Co. Ltd | 1873 | BT31 | 1891 | 7593 | ||
| Crown Prince Mine Syndicate Ltd | 1888 | BT31 | 4129 | 26607 | ||
| Crowndale Consols (Tin & Copper) Mining Co. Ltd | Whitchurch | Devon | 1873 | BT286 | 342 | |
| Crow’s Nest Oxide Mining Syndicate Ltd | 1925 | BT31 | 28894 | 203313 | ||
| Crucero Mining Syndicate Ltd | 1933 | BT31 | 33406 | 272784 | ||
| Cruzeiro Mining & Finance Co. Ltd | 1907 | BT31 | 18186 | 94562 | ||
| Csertest Regina Prospecting Co. Ltd | 1887 | BT31 | 3945 | 25010 | ||
| Cuban Prospecting Syndicate Ltd | 1916 | BT31 | 23387 | 144746 | ||
| Cue Victory Mines Ltd | 1898 | BT31 | 7823 | 55988 | ||
| Culchote Copper Mining Co | BT41 | 179 | 1018 | |||
| Culchote Copper Mining Co | 1856 | BT31 | 130 | 413 | ||
| Cumberland Barytes Mining Co. Ltd | Gilcrux | Cumberland | 1873 | BT31 | 1923 | 7924 |
| Cumberland Black Lead Mine Co. Ltd | Seathwaite | Cumberland | 1858 | BT31 | 380 | 1406 |
| Cumberland Black Lead Mine Co. Ltd | Seathwaite | Lancashire | BT41 | 180 | 1020 | |
| Cumberland Consolidated Lead & Copper Mining Co Ltd | Cumberland | 1864 | BT31 | 895 | 992C | |
| Cumberland Iron Mining & Smelting Co. Ltd | Cumberland | 1865 | BT31 | 1125 | 2266C | |
| Cumberland Lead Mines Ltd | Cumberland | 1882 | BT31 | 3069 | 17499 | |
| Cumberland Mines Ltd | Cumberland | 1907 | BT31 | 12046 | 94146 | |
| Cumbrian Mining Co. Ltd | Cumberland | 1907 | BT31 | 12077 | 94492 | |
| Cuthbertson Bruce Mines Ltd | 1898 | BT31 | 7947 | 57045 | ||
| Cwm Afon Copper Mining Co. Ltd | Ffestiniog | Merionethshire | 1859 | BT31 | 411 | 1585 |
| Cwm Afon Copper Mining Co. Ltd | Ffestiniog | Merionethshire | 1861 | BT41 | 180 | 1025 |
| Cwm Brwyno Lead Mining Co. Ltd | Llanbadarnfawr | Cardiganshire | 1878 | BT31 | 2438 | 12364 |
| Cwm Bychan Silver Lead Mining Co. Ltd | Machynlleth | Montgomeryshire | 1872 | BT31 | 1739 | 6417 |
| Cwm Daren Silver Lead Mining Co. Ltd | Goginan | Cardiganshire | 1868 | BT31 | 1424 | 4148 |
| Cwm Dwyfor & Brynarian Mines Co. Ltd | Taliesin | Cardiganshire | 1882 | BT31 | 3088 | 17685 |
| Cwm Dwyfor Copper & Silver Lead Mining Co. Ltd | Llanfihangel-y-Pennant | Caernarvonshire | 1868 | BT31 | 1430 | 4191 |
| Cwm Dwyfor Mining Co. Ltd | Taliesin | Cardiganshire | 1877 | BT31 | 2304 | 11135 |
| Cwm Elan Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1871 | BT31 | 1646 | 5701 |
| Cwm Erfin Mines Co. Ltd | Goginan | Cardiganshire | 1870 | BT41 | 180 | 1030 |
| Cwm Erfin Mines Co. Ltd | Goginan | Cardiganshire | 1858 | BT31 | 344 | 1240 |
| Cwm Lery Lead Mines Co. Ltd | Wales | 1871 | BT31 | 1603 | 5379 | |
| Cwm Llefrith Co. Ltd | Dolbenmaen | Caernarvonshire | 1889 | BT31 | 4418 | 28746 |
| Cwm Nant Ddu Lead Mining Co. Ltd | Machynlleth | Montgomeryshire | 1872 | BT31 | 1677 | 5953 |
| Cwm Orog Mines Ltd | Llangynog | Montgomeryshire | 1908 | BT31 | 12254 | 96438 |
| Cwm Pryf Mines Lead Mining Co. Ltd | Llantadarn | Cardiganshire | 1880 | BT31 | 2605 | 13742 |
| Cwm Rhaiadr Ltd | Machynlleth | Montgomeryshire | 1892 | BT31 | 5340 | 36602 |
| Cwm Ricket & Maesnant Lead Mining Co. Ltd | Llangurig | Montgomeryshire | 1870 | BT31 | 1540 | 4908 |
| Cwm Sebon Mining Co | Pen-bont-Rhydybeddau | Cardiganshire | BT41 | 180 | 1031 | |
| Cwm Sebon Mining Co. Ltd | Pen-bont-Rhydybeddau | Cardiganshire | BT41 | 174 | 993 | |
| Cwm Sebon Mining Co. Ltd * | Pen-bont-Rhydybeddau | Cardiganshire | 1856 | BT31 | 208 | 635 |
| Cwm Vron Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1871 | BT31 | 1593 | 5304 |
| Cwmbrane Mining Co | Llangadog | Cardiganshire | 1862 | BT31 | 633 | 2653 |
| Cwmbrwyno Blende & Lead Co. Ltd | Goginan | Cardiganshire | 1892 | BT31 | 5356 | 36748 |
| Cwmbyr Mining Co. Ltd | Machynlleth | Montgomeryshire | 1875 | BT31 | 2136 | 9823 |
| Cwmdyle Copper Mining Co. Ltd | Beddgelert | Caernarvonshire | 1857 | BT41 | 180 | 1027 |
| Cwmellan Silver Lead Mining Co. Ltd | Wales | 1858 | BT31 | 362 | 1331 | |
| Cwmellan Silver Lead Mining Co. Ltd | Wales | BT41 | 180 | 1029 | ||
| Cwmheisian Isaf Mining Co. Ltd | Llanfachreth | Merionethshire | 1862 | BT31 | 648 | 2726 |
| Cwmmynach Manganese Syndicate Ltd | Penmaenpool | Merionethshire | 1892 | BT31 | 5321 | 36423 |
| Cwmorog Silver Lead Mining Co. Ltd | Llangynog | Montgomeryshire | 1872 | BT31 | 1724 | 6306 |
| Cwmsymlog United Silver Mining Co. Ltd | Cwmsymlog | Cardiganshire | 1864 | BT31 | 873 | 886C |
| Cwmystwyth Co. Ltd | Devil’s Bridge | Cardiganshire | 1886 | BT31 | 3596 | 22102 |
| Cwmystwyth Mines Co. Ltd | Devil’s Bridge | Cardiganshire | 1858 | BT31 | 340 | 1224 |
| Cwmystwyth Mines Co. Ltd | Devil’s Bridge | Cardiganshire | BT41 | 180 | 1032 | |
| Cwmystwyth Mines New Co. Ltd | Devil’s Bridge | Cardiganshire | 1875 | BT31 | 2141 | 9868 |
| Cyffty Lead Mining Co. Ltd | Llanrwst | Caernarvonshire | 1899 | BT31 | 8782 | 64342 |
| Czar Silver & Galena Mine Ltd | 1883 | BT31 | 3227 | 18877 | ||
| Daggafontein Prospecting Syndicate Ltd | 1899 | BT31 | 16227 | 62710 | ||
| Dahlonega Co. Ltd | Georgia | U.S.A. | 1889 | BT31 | 4552 | 29818 |
| Dale Mining Co. Ltd | Alstonfield | Staffordshire | 1857 | BT31 | 208 | 1043 |
| Dale Mining Co. Ltd | Alstonfield | Staffordshire | 1856 | BT41 | 181 | 1034 |
| Dalmatia Mine Ltd | 1887 | BT31 | 3823 | 24007 | ||
| Dalrhiew Copper & Lead Mining Co. Ltd | Radnorshire | 1857 | BT41 | 181 | 1035 | |
| Dalton Mining Syndicate Ltd | Dalton in Furness | Lancashire | 1913 | BT31 | 21674 | 130765 |
| Danescombe Valley Mining Co. Ltd | Calstock | Cornwall | 1888 | BT31 | 4226 | 27361 |
| Danube Copper Mining Co. Ltd | 1907 | BT31 | 12218 | 96024 | ||
| Danube Mining Concession Ltd | 1910 | BT31 | 19582 | 110892 | ||
| Danubian Mining Corporation Ltd | 1881 | BT31 | 2909 | 16200 | ||
| Darby Mining & Reduction Co. Ltd | 1910 | BT31 | 19657 | 111834 | ||
| Darren Mining Co. Ltd | Llanbadarnfawr | Cardiganshire | 1865 | BT31 | 1168 | 2509C |
| Dartmoor Forest Mining Exploration Syndicate Ltd | Devon | 1913 | BT31 | 21845 | 132246 | |
| Dartmoor Minerals Ltd | Devon | 1905 | BT31 | 11182 | 85329 | |
| Dartmoor Peat & Iron Smelting Co. Ltd | Devon | 1891 | BT31 | 4969 | 33193 | |
| Darwen Mining Co. Ltd | 1872 | BT31 | 1713 | 6212 | ||
| Daudoch Mining Co. Ltd | Wales | 1881 | BT31 | 2801 | 15338 | |
| Dauphine Mines Syndicate Ltd | 1892 | BT31 | 5237 | 35591 | ||
| Davenport Mining Co. Ltd | 1872 | BT31 | 1726 | 6323 | ||
| Day Dawn & Norfolk Mines Ltd | 1904 | BT31 | 10608 | 80252 | ||
| De Broke Mining Co. Ltd | Devil’s Bridge | Cardiganshire | 1872 | BT31 | 1778 | 6707 |
| De Lamar Mining Co. Ltd | Idaho | U.S.A. | 1891 | BT31 | 5002 | 33492 |
| Deborah United Lead Mining Co. Ltd | Mold | Flintshire | 1862 | BT31 | 661 | 2792 |
| Decatur Mines Syndicate Ltd | 1892 | BT31 | 5240 | 35619 | ||
| Dee Bank Lead & Silver Works Ltd | Bagillt | Flintshire | 1889 | BT31 | 4493 | 29345 |
| Dee Side Mining Co. Ltd | Ballater | Aberdeenshire | 1874 | BT31 | 2003 | 8619 |
| Deep Level & Halkin Mining Co. Ltd | Halkyn | Flintshire | 1865 | BT31 | 1149 | 2406C |
| Deep Level Lead Mining Co. Ltd | Halkyn | Flintshire | 1861 | BT31 | 558 | 2276 |
| Deep Level Mining Co. Ltd | Halkyn | Flintshire | 1880 | BT31 | 2643 | 14037 |
| Deep River Mining Co | BT41 | 188 | 1065 | |||
| Deer Park Lead & Iron Ore Mining Co. Ltd | Newlyn East | Cornwall | 1876 | BT286 | 440 | |
| Deer Park Mining Co. Ltd | Stoke Climsland | Cornwall | 1871 | BT286 | 239 | |
| Denbigh Copper & Lead Mining Co. Ltd | Denbighshire | BT41 | 189 | 1068 | ||
| Denbigh Copper & Lead Mining Co. Ltd | Denbighshire | 1858 | BT31 | 338 | 1208 | |
| Denbighshire Consolidated Mines Co. Ltd | Llanferres | Denbighshire | 1872 | BT31 | 1713 | 6215 |
| Denham Bridge Mining Co | Devon | 1858 | BT41 | 189 | 1070 | |
| Denham Bridge Mining Co. Ltd | Devon | 1859 | BT31 | 383 | 1416 | |
| Derbyshire Mining & Exploration Ltd | Derbyshire | 1923 | BT31 | 28225 | 194019 | |
| Dereenalomane Barytes Mines Ltd | Ireland | 1907 | BT31 | 11951 | 93153 | |
| D’Eresby & Gwydyr Mines Ltd | Llanrwst | Caernarvonshire | 1890 | BT31 | 4705 | 31009 |
| D’Eresby Consols Mining Co. Ltd | Llanrwst | Caernarvonshire | 1878 | BT31 | 2411 | 12112 |
| D’Eresby Mining Co. Ltd | Llanrwst | Caernarvonshire | 1884 | BT31 | 3376 | 20157 |
| D’Eresby Mountain Mining Co. Ltd | Llanrwst | Caernarvonshire | 1877 | BT31 | 2313 | 11213 |
| Derry & Antrim Ore Co. Ltd | Ireland | 1907 | BT31 | 11930 | 92943 | |
| Derwen Dog Pennel-Gwyn Copper & Lead Mining Co. Ltd | Conwy | Caernarvonshire | 1878 | BT31 | 2411 | 12113 |
| Derwent Lead Mining & Smelting Co. Ltd | Blanchland | Northumberland | 1876 | BT31 | 2222 | 10503 |
| Derwent Mines Co | Blanchland | Northumberland | BT41 | 190 | 1078 | |
| Derwent Mines Co. Ltd * | Blanchland | Northumberland | 1857 | BT31 | 268 | 901 |
| Derwentwater Copper Lead & Zinc Ore Co. Ltd | Keswick | Cumberland | 1891 | BT31 | 5163 | 34892 |
| Descubriadora Mining Co. Ltd | 1868 | BT31 | 1392 | 3925 | ||
| Deseada Cobalt & Copper Mines of Spain Ltd | 1888 | BT31 | 4088 | 26212 | ||
| Detroit Mine Ltd | 1897 | BT31 | 7667 | 54728 | ||
| Development Trust (Mining & General) Ltd | 1927 | BT31 | 29862 | 222317 | ||
| Devil’s Bridge Mining Co. Ltd | Devil’s Bridge | Cardiganshire | 1871 | BT31 | 1600 | 5368 |
| Deviock Silver Lead Mining Co. Ltd | Deviock | Cornwall | 1871 | BT286 | 229 | |
| Devon & Cornwall Mining Syndicate Ltd | Devon | 1906 | BT31 | 17882 | 90403 | |
| Devon & Cornwall Prospecting Co. Ltd | Devon | 1887 | BT31 | 3920 | 24792 | |
| Devon Arsenic Manufacturing Co. Ltd | Devon | 1895 | BT31 | 6083 | 43051 | |
| Devon Consolidated Manganese Co. Ltd | Devon | 1883 | BT31 | 3226 | 18874 | |
| Devon Consols Tin Mining Co. Ltd | Dartmoor | Devon | 1864 | BT286 | 43 | |
| Devon Copper & Blende Mining Co. Ltd | Sydenham Damerel | Devon | 1880 | BT286 | 485 | |
| Devon Copper Ore Smelting Co. | Devon | BT41 | 191 | 1083 | ||
| Devon Friendship Mining Co. Ltd | Marytavy | Devon | 1880 | BT31 | 2726 | 14745 |
| Devon Gawton Co. Ltd | Tavistock | Devon | 1894 | BT31 | 5885 | 41342 |
| Devon Great Consols Ltd | Tavistock | Devon | 1899 | BT31 | 8645 | 63035 |
| Devon Great Maria Consolidated Mining Co. Ltd | Lamerton | Devon | 1865 | BT286 | 97 | |
| Devon Great Wheal Ellen Tin & Copper Mining Co. Ltd | Ashburton | Devon | 1865 | BT31 | 1108 | 2163 |
| Devon Kapunda Copper & Silver Lead Mining Co | Sydenham Damerel | Devon | 1852 | BT41 | 192 | 1089 |
| Devon Kapunda Copper & Silver Lead Mining Co. Ltd | Sydenham Damerel | Devon | 1859 | BT31 | 398 | 1509 |
| Devon Manganese Mines Ltd | Lamerton | Devon | 1879 | BT286 | 477 | |
| Devon Mining Syndicate Ltd | Devon | 1887 | BT31 | 3801 | 23810 | |
| Devon New Copper Mining Co. Ltd | Ashburton | Devon | 1858 | BT31 | 371 | 1362 |
| Devon New Copper Mining Co. Ltd | Ashburton | Devon | 1858 | BT41 | 192 | 1090 |
| Devon Union Mining Co. Ltd | Devon | 1852 | BT41 | 192 | 1091 | |
| Devon Union Mining Co. Ltd | Devon | 1860 | BT31 | 472 | 1834 | |
| Devon United Mines (1906) Ltd | Peter Tavy | Devon | 1906 | BT31 | 17941 | 91152 |
| Devon United Mines Syndicate Ltd | Devon | 1901 | BT31 | 16667 | 70538 | |
| Devon Westralian Mining & Prospecting Syndicate Ltd | 1895 | BT31 | 6182 | 43790 | ||
| Devon Wheal Lopes Mining Co. Ltd | Bickleigh | Devon | 1865 | BT286 | 99 | |
| Devonshire Great Consolidated Copper Mining Co | Devon | BT41 | 193 | 1096 | ||
| Devonshire Great Consolidated Copper Mining Co. Ltd | Devon | 1856 | BT31 | 142 | 445 | |
| Devonshire Silver Lead Mining Co. Ltd | Lydford | Devon | 1880 | BT31 | 2654 | 14117 |
| Devoran Arsenic & Chemical Works Ltd | Devon | 1889 | BT31 | 4460 | 29072 | |
| Dhoon Mining Co. Ltd | Maughold | Isle of Man | BT41 | 194 | 1100 | |
| Dhoon Mining Co. Ltd | Maughold | Isle of Man | 1858 | BT31 | 370 | 1358 |
| Dhuhill Prospecting Syndicate Ltd | 1896 | BT31 | 6606 | 46485 | ||
| Diamond Mining Corporation of London & South Africa Ltd | 1881 | BT31 | 2861 | 15765 | ||
| Diamond Prospecting Ltd | 1905 | BT31 | 11063 | 84143 | ||
| Diana Mine Ltd | 1913 | BT31 | 21318 | 127872 | ||
| Diaz Mines Ltd | 1902 | BT31 | 9846 | 73383 | ||
| Dickens Custer Mines Ltd | 1889 | BT31 | 4400 | 28605 | ||
| Dickens Custer Mines Ltd | 1898 | BT31 | 8016 | 57662 | ||
| Dinas Silica Co. Ltd | Glamorganshire | 1899 | BT31 | 8619 | 62834 | |
| Ding Dong Mining Syndicate Ltd | Gulval | Cornwall | 1913 | BT31 | 21158 | 126478 |
| Dinsdale Smelting Co. Ltd | 1900 | BT31 | 9020 | 66720 | ||
| Disraeli Mine Syndicate Co.Ltd | 1885 | BT31 | 3441 | 20765 | ||
| Dividend Mines Trust Co. Ltd | 1883 | BT31 | 3143 | 18159 | ||
| Dogondaji Mining Co. Ltd | 1919 | BT31 | 25649 | 164694 | ||
| Dolbenmaen Quarry & Mining Co. Ltd | Caernarvonshire | 1864 | BT31 | 981 | 1438C | |
| Dolcoath Mine Ltd | Camborne | Cornwall | 1895 | BT31 | 15503 | 44621 |
| Dolcoath Mine Ltd | Camborne | Cornwall | 1923 | BT31 | 32575 | 189861 |
| Dolcoath Tin Mining Co. | Camborne | Cornwall | 1895 | BT31 | 6229 | 44154 |
| Dolcoath United Co. Ltd | Camborne | Cornwall | 1861 | BT31 | 546 | 2211 |
| Dolfrw y Nog Mining Co | Llanfachreth | Merionethshire | 1862 | BT31 | 671 | 2855 |
| Dolgelly Iron Stone Co. Ltd | Dolgellau | Merionethshire | 1871 | BT31 | 1663 | 5846 |
| Dolgelly Quarry Syndicate Ltd | Dolgellau | Merionethshire | 1922 | BT31 | 27174 | 181340 |
| Dolgoch Lead & Copper Mining Co. Ltd | Tywyn | Merionethshire | 1861 | BT31 | 524 | 2104 |
| Dolgorouky Copper Mines & Smelting Co. Ltd | 1893 | BT31 | 5659 | 39491 | ||
| Dolwen Co. Ltd | Devil’s Bridge | Cardiganshire | 1867 | BT31 | 1333 | 3491 |
| Dolwen Consolidated Co. Ltd | Devil’s Bridge | Cardiganshire | 1872 | BT31 | 1672 | 5930 |
| Dolwen Lead Mining Co. Ltd | Devil’s Bridge | Cardiganshire | BT41 | 195 | 1107 | |
| Dolwen Lead Mining Co. Ltd | Devil’s Bridge | Cardiganshire | 1857 | BT31 | 229 | 731 |
| Dominion Mining Co. Ltd | 1870 | BT31 | 1565 | 5087 | ||
| Donegal Industrial Syndicate Ltd | Donegal | Ireland | 1906 | BT31 | 11454 | 88097 |
| Donegal Soapstone Syndicate Ltd | Donegal | Ireland | 1900 | BT31 | 8957 | 66102 |
| Dordogne Mineral & Smelting Co. Ltd | 1888 | BT31 | 4117 | 26473 | ||
| Douglas Exploration Syndicate Ltd | 1896 | BT31 | 7134 | 50322 | ||
| Douglas Head Mining Co. Ltd | Onchan | Isle of Man | 1865 | BT31 | 1183 | 2598C |
| Douglas Head Mining Co. Ltd | Onchan | Isle of Man | 1888 | BT31 | 4160 | 26875 |
| Douglas Mining & Quartz Crushing Co. | Onchan | Isle of Man | 1894 | BT31 | 5786 | 40551 |
| Douglas Mining & Quartz Crushing Co. | Onchan | Isle of Man | 1892 | BT31 | 5418 | 37369 |
| Douro Mining Co. Ltd | 1860 | BT31 | 492 | 1940 | ||
| Douro Mining Co. Ltd | BT41 | 196 | 1114 | |||
| Douro Silver Lead Mining Co. Ltd | Portugal | 1865 | BT31 | 1180 | 2583C | |
| Downton Hall Mining Co. Ltd | Shropshire | 1863 | BT31 | 836 | 718C | |
| Drake Walls Mining Co. Ltd | Calstock | Cornwall | 1886 | BT286 | 52 | |
| Drake Walls Mining Co. Ltd | Calstock | Cornwall | 1886 | BT286 | 569 | |
| Drake Walls United Tin & Copper Mining Co. Ltd | Calstock | Cornwall | 1881 | BT286 | 533 | |
| Drie Koppie Diamond Mine Ltd | 1911 | BT31 | 13758 | 118774 | ||
| Driggeth Silver Lead Mining Co. Ltd | Caldbeck | Cumberland | 1878 | BT31 | 2402 | 12013 |
| Drina Mining & Development Co. Ltd | 1907 | BT31 | 11901 | 92641 | ||
| Drobie Mines Ltd | 1884 | BT31 | 3419 | 20551 | ||
| Dromod Iron Ore Co. Ltd | Ireland | 1873 | BT31 | 1811 | 6955 | |
| Droskyn & Ramoth Tin Mining Co. Ltd | Perranzabuloe | Cornwall | 1886 | BT286 | 563 | |
| Droskyn & Ramoth Tin Mining Co. Ltd | Perranzabuloe | Cornwall | 1886 | BT286 | 42 | |
| Druid Mining Co. Ltd | Buckfastleigh | Devon | 1866 | BT286 | 137 | |
| Drws y Coed Copper Mining Co. Ltd | Nantlle | Caernarvonshire | 1876 | BT31 | 2215 | 10443 |
| Dry Gills & Stone Ends Mining & Smelting Co. Ltd | Cumberland | BT41 | 201 | 1136 | ||
| Dry Gills & Stone Ends Mining & Smelting Co. Ltd | Cumberland | 1859 | BT31 | 417 | 1610 | |
| Dryburnside Silver Lead Mining Co. Ltd | Alston with Garrigill | Cumberland | 1876 | BT31 | 2260 | 10802 |
| Dubby Syke Mining Co. Ltd | Harwood Fell | Durham | 1875 | BT31 | 2077 | 9232 |
| Duchy Mining Co. Ltd | Perranzabuloe | Cornwall | 1881 | BT31 | 2795 | 15289 |
| Duchy of Cornwall Tin Smelting Co. Ltd | Cornwall | 1882 | BT31 | 2927 | 16321 | |
| Duchy Peru & Ruthers Mining Co. Ltd | Perranzabuloe | Cornwall | 1880 | BT286 | 500 | |
| Duchy Peru Ltd | Perranzabuloe | Cornwall | 1883 | BT31 | 3227 | 18876 |
| Duffryan Aled & Nanty Plum Copper & Lead Mining Co. Ltd | Llansannan | Denbighshire | 1895 | BT31 | 6236 | 44199 |
| Duffryn Consols Lead Mining Co. Ltd | Wales | 1860 | BT31 | 517 | 2062 | |
| Dufton Fell Lead Ore & Barytes Co. Ltd | Dufton | Westmorland | 1884 | BT31 | 3320 | 19686 |
| Dufton Mining Co. Ltd | Dufton | Westmorland | 1894 | BT31 | 5824 | 40865 |
| Dulces Nombres Silver Mining Co. Ltd | 1906 | BT31 | 17951 | 91280 | ||
| Dulta Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | BT41 | 203 | 1148 | |
| Dulta Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | 1860 | BT31 | 445 | 1721 |
| Dun & Glen Ltd | 1895-1903 | BT2 | 2975 | |||
| Dun Mountain Copper Mining Co. Ltd | New Zealand | 1857 | BT41 | 203 | 1152 | |
| Dunallan Mine Syndicate Ltd | Ireland | 1895 | BT31 | 6378 | 45035 | |
| Duncan Mines Ltd | 1897 | BT31 | 7629 | 54458 | ||
| Duncan United Mines Ltd | 1901 | BT31 | 9537 | 70852 | ||
| Dundalk Lead Mining Co. Ltd | Ireland | 1859 | BT41 | 203 | 1149 | |
| Dundalk Lead Mining Co. Ltd | Ireland | 1859 | BT31 | 386 | 1445 | |
| Dundalk Silver Lead & Copper Mining Co. Ltd | Ireland | 1863-1881 | BT2 | 152 | ||
| Dundas Cuni Mining Co. Ltd | 1913 | BT31 | 21302 | 127766 | ||
| Duneen Bay Mineral Co. Ltd | Ireland | 1875 | BT31 | 2116 | 9633 | |
| Dungannon Mining Co. Ltd | Ireland | 1877 | BT31 | 2332 | 11356 | |
| Dunkeld Mining Co. Ltd | Dunkeld | Perthshire | 1911 | BT31 | 13579 | 115291 |
| Dunkwa Mining Syndicate Ltd | 1910 | BT31 | 19365 | 108660 | ||
| Dunmanus Bay Barytes Company Ltd | Ireland | 1914 | BT31 | 22180 | 134987 | |
| Dunmanus Bay Mine & Smelting Co. Ltd | Ireland | 1880 | BT31 | 2611 | 13791 | |
| Dunsley Wheal Phoenix Mining Co. Ltd | St Cleer | Cornwall | 1871-1932 | BT2 | 384 | |
| Durham County Lead Mining Co. Ltd | Durham | 1865 | BT31 | 1155 | 2440C | |
| Durham Lead Mining Co. Ltd | Frosterley | Durham | 1879 | BT31 | 2591 | 13616 |
| Dyffryn Aled Copper & Lead Mining Co. Ltd | Llansannan | Denbighshire | 1875 | BT31 | 2161 | 10051 |
| Dyffryn Ceiriog Mining Co. Ltd | Wales | 1865 | BT31 | 1104 | 2139C | |
| Dyffryn Mining Co. Ltd | Wales | 1888 | BT31 | 4275 | 27734 | |
| Dyfngwn Mines Co | Penegoes | Montgomeryshire | 1867 | BT31 | 1354 | 3656 |
| Dylefe Mining Co. Ltd | Llanbrynmair | Montgomeryshire | BT41 | 205 | 1164 | |
| Dylefe Mining Co. Ltd | Llanbrynmair | Montgomeryshire | 1858 | BT31 | 349 | 1264 |
| Dyliffe Consols Silver Lead & Copper Mining Co. Ltd | Llanbrynmair | Montgomeryshire | 1869 | BT31 | 1441 | 4260 |
| Dyliffe Lead Mining Co. Ltd | Llanbrynmair | Montgomeryshire | 1873 | BT31 | 1865 | 7363 |
