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Company Name |
Location |
Area |
Year |
Class |
Box No |
Company No |
| T.E. Briggs Ltd | 1920 | BT31 | 25776 | 166051 | ||
| T.H. Thorp Ltd | 1895 | BT31 | 6153 | 43572 | ||
| Tadergount Copper Mine Ltd | 1879 | BT31 | 2549 | 13262 | ||
| Tahoma Co. Ltd | Idaho | U.S.A. | 1885 | BT31 | 3512 | 21380 |
| Talacre & Gronant Mining Co. Ltd | Gronant | Flintshire | 1880 | BT31 | 2637 | 13994 |
| Talacre District Mining & Drainage Co. Ltd | Gronant | Flintshire | 1892 | BT31 | 5416 | 37351 |
| Talargoch Mining Co. Ltd | Dyserth | Flintshire | 1875 | BT31 | 2143 | 9898 |
| Talargoch Mining Co. Ltd | Dyserth | Flintshire | BT41 | 673 | 3677 | |
| Talargoch Mining Co. Ltd | Dyserth | Flintshire | 1857 | BT31 | 246 | 809 |
| Taliesin Mining Co. Ltd | Taliesin | Cardiganshire | 1871 | BT31 | 1625 | 5534 |
| Taliesin Silver Lead Mining Co. Ltd | Taliesin | Cardiganshire | 1857 | BT31 | 243 | 791 |
| Talisman Mines Ltd | 1896 | BT31 | 7139 | 50362 | ||
| Talley Lead Mining Co. Ltd | Talley | Carmarthenshire | 1880 | BT31 | 2725 | 14739 |
| Talybont Lead Mines Ltd | Tal-y-bont | Cardiganshire | 1910 | BT31 | 19533 | 110332 |
| Talybont Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1875 | BT31 | 2145 | 9912 |
| Talybont Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1885 | BT31 | 3542 | 21623 |
| Talysarn Copper Mines Ltd | Drewsycoed | Caernarvonshire | 1907 | BT31 | 11866 | 92263 |
| Tamar Consolidated Tin Mines Ltd | Devon | 1927 | BT31 | 32832 | 221816 | |
| Tamar Consols Silver Lead Mining Co. Ltd | Bere Ferrers | Devon | 1871 | BT286 | 220 | |
| Tamar Silver Lead & Fluorspar Mining Co. Ltd | Bere Ferrers | Devon | 1878 | BT286 | 463 | |
| Tamar Tin Smelting Co. Ltd | Bere Alston | Devon | 1884 | BT31 | 14784 | 20518 |
| Tambaroora & Turon Mines Ltd | 1890 | BT31 | 4790 | 31712 | ||
| Tambracherry Estates Co. Ltd | India | 1881 | BT31 | 2751 | 14938 | |
| Tan y Bwlch & Bwlch y Tocyn Mining Co. Ltd | Pwllheli | Caernarvonshire | 1877 | BT31 | 2339 | 11425 |
| Tan y Bwlch Lead & Copper Mining Co. Ltd | Pwllheli | Caernarvonshire | 1876 | BT31 | 2286 | 11004 |
| Tan y Garth Mining Co. Ltd | Bethesda | Caernarvonshire | 1909 | BT31 | 12716 | 102167 |
| Tan yr Allt (Cardiganshire) Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1874 | BT31 | 1932 | 8006 |
| Tan yr Allt Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1869 | BT31 | 1479 | 4520 |
| Tandem Smelting Co. Ltd | 1894 | BT31 | 15400 | 41477 | ||
| Tangier Mine Ltd | 1897 | BT31 | 7639 | 54536 | ||
| Tankerville Great Consols Co Ltd | Shelve | Shropshire | 1880 | BT31 | 2709 | 14603 |
| Tankerville Mining Co. Ltd | Shelve | Shropshire | 1870 | BT31 | 1522 | 4793 |
| Tarset Mining Co. Ltd | Bellingham | Durham | 1882 | BT31 | 3061 | 17423 |
| Tasmanian Prospecting Syndicate Ltd | 1904 | BT31 | 10689 | 80972 | ||
| Tasmanian Smelting Co. Ltd | 1898 | BT31 | 15932 | 56365 | ||
| Tassan Mining Co. Ltd | Castleblaney | Ireland | 1857 | BT41 | 675 | 3686 |
| Tassan Mining Co. Ltd | Castleblaney | Ireland | 1857 | BT31 | 249 | 821 |
| Taunus Silver Lead & Copper Mining Co. Ltd | Nassau | Germany | 1881 | BT31 | 2815 | 15427 |
| Tavarone Mining Co. Ltd | Italy | 1870 | BT31 | 1523 | 4799 | |
| Tavistock Great Consols Ltd | Tavistock | Devon | 1881 | BT31 | 2851 | 15687 |
| Tavy Consols Mines & Arsenic Works Ltd | Buckland Monachorum | Devon | 1881 | BT286 | 543 | |
| Tavy Consuls Mines & Arsenic Works Ltd | Buckland Monachorum | Devon | 1881 | BT286 | 6 | |
| Tavy Mining Syndicate Ltd | Buckland Monachorum | Devon | 1887 | BT31 | 3976 | 25253 |
| Tavy United Mines & Arsenic Works Ltd | Buckland Monachorum | Devon | 1889 | BT31 | 4464 | 29105 |
| Tecoma Silver Mining Co. Ltd | Utah | U.S.A. | 1873 | BT31 | 1803 | 6905 |
| Tees Side Lead Mining Co. Ltd | Garrigill | Cumberland | 1861 | BT31 | 538 | 2175 |
| Teesdale Lead & Zinc Mines Ltd | Stanhope | Durham | 1906 | BT31 | 11582 | 89414 |
| Teesdale Mineral Co | Durham | 1892 | BT31 | 5307 | 36309 | |
| Teesdale Mining Co. Ltd | Harwood | Durham | 1874 | BT31 | 1930 | 7984 |
| Teify Vale Mining Co. Ltd | Cardiganshire | 1895 | BT31 | 6559 | 46158 | |
| Teign Valley Lead & Barytes Mining Co. Ltd | Bridford | Devon | 1870 | BT286 | 189 | |
| Teign Valley Mining Co. Ltd | Bridford | Devon | 1896 | BT31 | 15580 | 47193 |
| Telemarken Copper Mining & Smelting Co. Ltd | Norway | 1906 | BT31 | 11527 | 88850 | |
| Telemarken Copper Mining & Smelting Co. Ltd | Norway | 1906 | BT31 | 11527 | 88850 | |
| Temengor Tin Mining Co. Ltd | 1926 | BT31 | 32764 | 215126 | ||
| Temesvar Mining Co. Ltd | 1908 | BT31 | 12462 | 98942 | ||
| Temple Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1876 | BT31 | 2229 | 10546 |
| Templelyne Mining Co | BT41 | 676 | 3697 | |||
| Terras Syndicate Ltd | St Stephen in Brannel | Cornwall | 1893 | BT31 | 5494 | 38046 |
| Terras Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | 1870 | BT286 | 190 | |
| Terriccio Copper Mining Co. Tuscany Ltd | Italy | 1863 | BT31 | 770 | 387C | |
| Terriccio Estate & Copper Mining Co. Ltd | Italy | 1876 | BT31 | 2250 | 10730 | |
| Tetiuhe Mining Corporation Ltd | 1925 | BT31 | 32687 | 206055 | ||
| Texas & New Mexico Land Syndicate Ltd | 1883-1885 | BT2 | 1221 | |||
| Thames Lead & Silver Mining Syndicate Ltd | 1892-1896 | BT2 | 2417 | |||
| Thames Smelting & Refining Co. Ltd | 1913 | BT31 | 21617 | 130279 | ||
| The Argyle Mining Co. Ltd | Scotland | nd | BT2 | 4767 | ||
| The Beni-Felkai Mining Co. Ltd Vol 1. | 1907 | BT31 | 37673 | 94384 | ||
| The Beni-Felkai Mining Co. Ltd Vol 2 | 1907 | BT31 | 37674 | 94384 | ||
| The British & International Mining & Finance Corporation Ltd (as changed) | 1910 | BT31 | 35861 | 109923 | ||
| The British Tin Smelting Co. Ltd | 1937 | BT31 | 41470 | 329330 | ||
| The Central African Mining Co. Ltd | nd | BT2 | 4822 | |||
| The Coombsdale Mining Co. Ltd | 1927 | BT31 | 29872 | 222480 | ||
| The Crystalline Mining Co. Ltd | nd | BT2 | 5143 | |||
| The Donovan Mining Co. Ltd | nd | BT2 | 5117 | |||
| The Drayton Mining & Industrial Corporation Ltd | 1928 | BT31 | 30329 | 233812 | ||
| The Escondido Mining Syndicate Ltd | nd | BT2 | 5508 | |||
| The Fifeshire Mining Syndicate Ltd | Fifeshire | nd | BT2 | 4537 | ||
| The Gaeta Mining Syndicate Ltd | nd | BT2 | 5671 | |||
| The Gaeta Pioneer Mining Co. Ltd | nd | BT2 | 5879 | |||
| The Hawks Wood Mining Co. Ltd | Launceston | Cornwall | 1944 | BT31 | 38104 | 389497 |
| The Herman Mining Co. Ltd | nd | BT2 | 5296 | |||
| The Kithill Mining Co. Ltd | Calstock | Cornwall | nd | BT2 | 5108 | |
| The Mineral Boring & Mining Co. Ltd | 1979 | BT2 | 1974 | 85 | ||
| The Ring Valley Mining Co. | Tasmania | Australia | 1900 | BT31 | 9017 | 66710 |
| The Santon Mining Co. Ltd Vol 1 | Santon | Lincolnshire | 1918 | BT31 | 38339 | 150611 |
| The Santon Mining Co. Ltd Vol F. | Santon | Lincolnshire | 1918 | BT31 | 38340 | 150611 |
| The Scots-Canadian Mining & Developing Syndicate L | nd | BT2 | 4410 | |||
| The Scottish Californian Mining Syndicate Ltd | nd | BT2 | 4424 | |||
| The Scottish Gympie Freehold Mining Co. 1900 L | nd | BT2 | 4674 | |||
| The Scottish Mexican Mining Co. Ltd | nd | BT2 | 5439 | |||
| The Strathearn Mining Syndicate of British Columbi | nd | BT2 | 3882 | |||
| The Veraguas Mining Co. Ltd | nd | BT2 | 5765 | |||
| Thistle Consolidated Mines Ltd | 1896 | BT31 | 6775 | 47673 | ||
| Thomas Briggs Ltd | 1894 | BT31 | 5963 | 42049 | ||
| Thomas Spowart & Co. Ltd | 1887 | BT2 | 1630 | |||
| Thracian Mining Syndicate Ltd | 1926 | BT31 | 33836 | 215529 | ||
| Threlkeld Lead Mines Ltd | Keswick | Cumberland | 1913 | BT31 | 21883 | 132532 |
| Threlkeld Mines Ltd | Keswick | Cumberland | 1906 | BT31 | 17898 | 90605 |
| Threlkeld Mining Co. Ltd | Keswick | Cumberland | 1879-1932 | BT2 | 906 | |
| Tibet Mines & Minerals Co. Ltd | 1904 | BT31 | 10759 | 81554 | ||
| Tiflis Iron Mines & Works Ltd | 1873 | BT31 | 1901 | 7686 | ||
| Tigon Mining & Finance Corporation Ltd | 1913 | BT31 | 35123 | 131582 | ||
| Tin & Amblygonite Mines Ltd | 1905 | BT31 | 11153 | 85050 | ||
| Tin Electro Smelting (Zinnoxyd) Co. Ltd | 1900 | BT31 | 8933 | 65875 | ||
| Tin Era Mines Ltd | St Cleer | Cornwall | 1887 | BT286 | 72 | |
| Tin Era Mines Ltd | St Cleer | Cornwall | 1887 | BT286 | 582 | |
| Tin Hill Ltd | St Stephen | Cornwall | 1880 | BT31 | 2712 | 14623 |
| Tin Mines of West Cornwall Ltd | Cornwall | 1906 | BT31 | 11546 | 89022 | |
| Tin Selection Trust | East Wheal Lovell & Parc-an-chy | Cornwall | 1924 | BT31 | 32660 | 202633 |
| Tincroft Mining Co. Ltd | Camborne | Cornwall | 1896 | BT31 | 6788 | 47761 |
| Tindene Co. Ltd | Breage | Cornwall | 1890 | BT31 | 4906 | 32659 |
| Tindene Mining Co. Ltd | Breage | Cornwall | 1886 | BT31 | 3775 | 23576 |
| Tinoca Ltd | 1887 | BT2 | 1666 | |||
| Titanium Ore Co. Ltd | Cornwall | 1864 | BT31 | 962 | 1338C | |
| Tocopilla Copper Mining & Smelting Co. Ltd | Bolivia | 1881 | BT31 | 2817 | 15439 | |
| Toiyabe Silver Mining Co. Ltd | Nevada | U.S.A. | 1871 | BT31 | 1630 | 5571 |
| Tokar (Sudan) Prospecting Syndicate Ltd | 1904 | BT31 | 10902 | 82746 | ||
| Toledo Silver Lead Mines Co. Ltd | 1889 | BT31 | 4548 | 29792 | ||
| Tolgullow United Mines Co. Ltd | Gwennap | Cornwall | 1886 | BT286 | 46 | |
| Tolgullow United Mines Co. Ltd | Gwennap | Cornwall | 1886 | BT286 | 565 | |
| Tolgus Mines (1927) Ltd | Redruth | Cornwall | 1927 | BT31 | 29829 | 221557 |
| Tolgus Mines Ltd | Redruth | Cornwall | 1919 | BT31 | 24373 | 152935 |
| Tolima El Dorado Mines Ltd | 1899 | BT31 | 8485 | 61753 | ||
| Tolima Mining Co. Ltd | 1909 | BT31 | 18892 | 103567 | ||
| Tolima Silver Mining Co. Ltd | 1871 | BT31 | 1617 | 5481 | ||
| Toll Dish Mine Syndicate Ltd | St Colomb | Cornwall | 1910 | BT31 | 13259 | 109777 |
| Toll Dish Tin Mining Co. Ltd | St Colomb | Cornwall | 1880 | BT286 | 491 | |
| Toll Dish Tin Mining Co. Ltd | St Enoder | Cornwall | 1887 | BT286 | 579 | |
| Toll Dish Tin Mining Co. Ltd | St Enoder | Cornwall | 1887 | BT286 | 66 | |
| Tominil (Mexican) Mining Co. (1910) Ltd | 1910 | BT31 | 19627 | 111419 | ||
| Tominil (Mexican) Mining Co. Ltd | 1906 | BT31 | 11762 | 91215 | ||
| Tominil Mines Ltd | Mexico | 1891 | BT31 | 5217 | 35379 | |
| Tondu Co. Ltd | Maesteg | Glamorganshire | 1874 | BT31 | 2004 | 8620 |
| Torbay Hematite Iron Mining Co. Ltd | Brixham | Devon | 1863 | BT286 | 29 | |
| Toro Mining Co. Ltd | 1892-1894 | BT2 | 2305 | |||
| Torres Mines Ltd | 1906 | BT31 | 11404 | 87551 | ||
| Toweli South African Estates Ltd | 1889 | BT31 | 4620 | 30329 | ||
| Townhead Mining Co. Ltd | Egremont | Cumberland | 1905 | BT31 | 17521 | 85426 |
| Tracton Silver Lead Mining Co. Ltd | Ireland | 1858 | BT31 | 353 | 1287 | |
| Tracton Silver Lead Mining Co. Ltd | Ireland | 1858 | BT41 | 690 | 3760 | |
| Transatlantic Mines Purchase Syndicate Ltd | 1896 | BT31 | 6984 | 49177 | ||
| Transvaal Copper & Mineral Co. Ltd (1884) | Transvaal | South Africa | 1884 | BT31 | 3272 | 19268 |
| Transvaal Estates & Development Co. Ltd | South Africa | 1889 | BT31 | 31144 | 28367 | |
| Transvaal Exploration Syndicate Ltd | Transvaal | South Africa | 1886 | BT31 | 3765 | 23476 |
| Transvaal Mines Acquisition Syndicate Ltd | 1888 | BT31 | 4300 | 27913 | ||
| Transvaal Mines Development Association Ltd | 1887 | BT31 | 3866 | 24381 | ||
| Transvaal Prospecting Co. Ltd | Transvaal | South Africa | 1886 | BT31 | 3698 | 22995 |
| Transvaal Prospecting Co. Ltd | Transvaal | South Africa | 1887 | BT31 | 3921 | 24801 |
| Transvaal Syndicate Ltd | Transvaal | South Africa | 1884 | BT31 | 3358 | 20016 |
| Traversella Mines Ltd | 1899 | BT31 | 8754 | 64108 | ||
| Trebarvah Mining Co. Ltd | Perranuthnoe | Cornwall | 1872 | BT286 | 300 | |
| Trebell Mining Co. Ltd | Lanivet | Cornwall | 1952 | BT31 | 38149 | 504089 |
| Treburgett Consolidated Mines Ltd | St Teath | Cornwall | 1919 | BT31 | 24430 | 153417 |
| Treburland Tin Mining Co. Ltd | Altarnun | Cornwall | 1881 | BT286 | 544 | |
| Treburland Tin Mining Co. Ltd | Altarnun | Cornwall | 1881 | BT286 | 8 | |
| Treburland Wolfram & Tin Co. Ltd | Altarnun | Cornwall | 1913 | BT31 | 21154 | 126451 |
| Trecastell Lead Mines Ltd | Conwy | Caernarvonshire | 1950 | BT31 | 37587 | 480424 |
| Trecastell Lead Mines Ltd | Conwy | Caernarvonshire | 1914 | BT31 | 22246 | 135528 |
| Trecastell Mining Co. Ltd | Conwy | Caernarvonshire | 1912 | BT31 | 13809 | 119914 |
| Trecastell Mining Co. Ltd | Conwy | Caernarvonshire | 1894 | BT31 | 5891 | 41377 |
| Trefriw Mining Co. Ltd | Trefriw | Caernarvonshire | 1877 | BT31 | 2368 | 11691 |
| Trefriw Mining Co. Ltd | Trefriw | Caernarvonshire | 1913 | BT31 | 21830 | 132138 |
| Trefriw Sulphur Co. Ltd | Trefriw | Caernarvonshire | 1885 | BT31 | 3460 | 20925 |
| Tregardock Silver Lead Mining Co. Ltd | St Teath | Cornwall | 1874 | BT286 | 389 | |
| Tregardock United Mining Co. Ltd | St Teath | Cornwall | 1876 | BT286 | 431 | |
| Tregeagle Mine Ltd | St Neot | Cornwall | 1906 | BT31 | 17941 | 91145 |
| Tregeagle Tin Mining Co. Ltd | St Neot | Cornwall | 1888 | BT31 | 4049 | 25855 |
| Tregeare Manganese Mining Co. Ltd | Egloskerry | Cornwall | Not Stated | BT286 | 600 | |
| Tregeare Manganese Mining Co. Ltd | Egloskerry | Cornwall | 1890 | BT286 | 144 | |
| Tregeare Manganese Mining Co. Ltd | Egloskerry | Cornwall | 1890 | BT286 | 599 | |
| Tregonna Silver Lead Mining Co | Little Petherick | Cornwall | 1888 | BT286 | 586 | |
| Tregonna Silver Lead Mining Co. Ltd | Little Petherick | Cornwall | 1888 | BT286 | 106 | |
| Tregontrees & Old Polgooth Consols Mining Co. Ltd | St Austell | Cornwall | 1883 | BT31 | 3138 | 18099 |
| Tregothnan Consols Mining Co | Cornwall | BT41 | 693 | 3775 | ||
| Tregrehan Mining Co. Ltd | St Blazey | Cornwall | 1909 | BT31 | 18972 | 104563 |
| Tregurtha Downs & Owen Vean Consols Mining Co. Ltd | St Hilary | Cornwall | 1863 | BT286 | 1 | |
| Tregurtha Downs Consolidated Mines Ltd | St Hilary | Cornwall | 1899 | BT31 | 8647 | 63053 |
| Tregurtha Downs Mines Ltd | Goldsithney | Cornwall | 1885 | BT31 | 3516 | 21411 |
| Tregurtha Downs Mining Co. Ltd | St Hilary | Cornwall | 1860 | BT31 | 519 | 2077 |
| Trelech Mines Co. Ltd | Llanboidy | Carmarthenshire | 1865 | BT31 | 1124 | 2256C |
| Treleigh Consolidated Tin & Copper Mining Co | Redruth | Cornwall | BT41 | 693 | 3776 | |
| Trellynia Lead Mining Co. Ltd | Holywell | Flintshire | 1867 | BT31 | 1340 | 3547 |
| Trelogan Lead Mining Co. Ltd | Llanasa | Flintshire | 1862 | BT31 | 664 | 2812 |
| Trelogan Lead Mining Co. Ltd | Llanasa | Flintshire | 1863 | BT31 | 849 | 789C |
| Trelyon Tin Mining Co. Ltd | St Ives | Cornwall | 1894 | BT31 | 5934 | 41762 |
| Treore Antimony Mine & Smelting Co. Ltd | Port Gaverne | Cornwall | 1884 | BT31 | 3416 | 20525 |
| Tresavean Mines Ltd | Gwennap | Cornwall | 1881 | BT31 | 2813 | 15418 |
| Tresellyn Tin Mining Co. Ltd | Altarnun | Cornwall | 1872 | BT286 | 261 | |
| Tresviso Calamine Mines Ltd | 1883 | BT31 | 3228 | 18888 | ||
| Trethellan Silver Lead Mine Ltd | Crantock | Cornwall | 1872 | BT286 | 275 | |
| Trethellan Silver Lead Mines Syndicate Ltd | Gwennap | Cornwall | 1887 | BT286 | 578 | |
| Trethellan Silver Lead Mines Syndicate Ltd | Lanner | Cornwall | 1887 | BT286 | 64 | |
| Trethin Silver Lead Mining Co. Ltd | Advent | Cornwall | 1876 | BT286 | 418 | |
| Tretoil Tin & Iron Mining Co. Ltd | Lanivet | Cornwall | 1873 | BT286 | 320 | |
| Trevarren United Mines Ltd | St Austell | Cornwall | 1882 | BT31 | 3061 | 17421 |
| Trevarth Ltd | Cornwall | 1885 | BT31 | 3509 | 21364 | |
| Trevaunance Mine Ltd | St Agnes | Cornwall | 1910 | BT31 | 13372 | 111619 |
| Treveddoe Mining Co. Ltd | Warleggan | Cornwall | 1900 | BT31 | 16450 | 66960 |
| Trevega Mine Ltd | St Ives | Cornwall | 1907 | BT31 | 11982 | 93495 |
| Trevenna Tin Mining Co. Ltd | St Neot | Cornwall | 1887 | BT31 | 3997 | 25428 |
| Trevesa & Brea Tin & Copper Mining Co. Ltd | Cornwall | 1864 | BT286 | 59 | ||
| Trevinnick Mine Syndicate Ltd | St Kew | Cornwall | 1917 | BT31 | 23806 | 148354 |
| Trevinnick Mining Syndicate Ltd | St Kew | Cornwall | 1890 | BT31 | 4697 | 30944 |
| Trevisa Mining Co. Ltd | St Enoder | Cornwall | BT41 | 694 | 3780 | |
| Trevisa Mining Co. Ltd | St Enoder | 1859 | BT31 | 420 | 1621 | |
| Trevorrack Mining Co. Ltd | Cornwall | 1873 | BT286 | 344 | ||
| Trewassic Silver Lead Mining Co. Ltd | 1872 | BT286 | 292 | |||
| Trewey Consolidated Ltd | Zennor | Cornwall | 1907 | BT31 | 12019 | 93855 |
| Trewey Downs Mining Co. Ltd | St Ives | Cornwall | 1906 | BT31 | 11675 | 90326 |
| Trewint Wolfram Mining Co. Ltd | Altarnun | Cornwall | 1916 | BT31 | 23436 | 145112 |
| Trewiston Silver Lead Mining Co. Ltd | Cornwall | 1874 | BT286 | 375 | ||
| Trewitten Mining Co. Ltd | St Cleer | Cornwall | 1881 | BT31 | 2769 | 15102 |
| Trewollack Wheal Rose Silver Lead Mining Co. Ltd | Columb Minor | Cornwall | 1864 | BT286 | 67 | |
| Trimley Hall Lead Mining Co. Ltd | Llanfynydd | Wales | 1862 | BT31 | 619 | 2596 |
| Troed y Rhiw Mining Co. Ltd | Cilycwm | Carmarthernshire | 1863 | BT31 | 834 | 709C |
| Trojes Mining & Smelting Co. Ltd | 1876 | BT31 | 2255 | 10768 | ||
| Trojes United Mining & Smelting Co. Ltd | 1885 | BT31 | 3489 | 21200 | ||
| Trout Beck Mining Co. Ltd | Dufton Fell | Westmorland | 1874 | BT31 | 2035 | 8843 |
| Troy Silver Mining Co. Ltd | Nevada | U.S.A. | 1870 | BT31 | 1571 | 5139 |
| True Blue Mining Co. Ltd | Holywell | Flintshire | 1898 | BT31 | 7789 | 55692 |
| Truro Lead Mining Co. Ltd | Cornwall | 1871 | BT31 | 1624 | 5530 | |
| Tubas Mining & Milling Co. Ltd | 1877 | BT31 | 2355 | 11572 | ||
| Tucson Mining & Smelting Co. Ltd | 1894 | BT31 | 6036 | 42659 | ||
| Tulman Mines Equipment Syndicate Ltd | 1898 | BT31 | 7770 | 55545 | ||
| Tumacacori Mining & Land Co. Ltd | 1870 | BT31 | 1530 | 4843 | ||
| Tunisian Mining Syndicate Ltd | Tunisia | 1907 | BT31 | 11906 | 92711 | |
| Turon Mines Ltd | 1897 | BT31 | 7389 | 52425 | ||
| Turquoise Mines Calaite Ltd | 1900 | BT31 | 8960 | 66134 | ||
| Tuscan Mining Co | BT41 | 695 | 3794 | |||
| Twyr Gwyn Lead Mining Co. Ltd | Wales | 1870 | BT31 | 1552 | 4986 | |
| Tybo Consolidated Mining Co. Ltd | SI | 1874 | BT31 | 1973 | 8389 | |
| Tycerrig Silver Lead Mining Co. Ltd | Cayo | Carmarthenshire | 1874 | BT31 | 1977 | 8442 |
| Tygwyn Mines Co. Ltd | Devil’s Bridge | Cardiganshire | 1869 | BT31 | 1467 | 4446 |
| Tyllwyd Silver Lead Mining Co. Ltd | Rheidol Valley | Cardiganshire | 1873 | BT31 | 1822 | 7059 |
| Tyn Dwr Mine Ltd | Wales | 1925 | BT31 | 29293 | 209302 | |
| Tyn y Fron Lead Mining Co. Ltd | Ystemtuan | Montgomeryshire | 1877 | BT31 | 2335 | 11386 |
| Tyne Head Mining Co. Ltd | Tynehead | Cumberland | BT41 | 697 | 3800 | |
| Tyne Head Mining Co. Ltd | Tynehead | Cumberland | 1857 | BT31 | 310 | 1076 |
| Tynehead Sulphur Copper & Lead Co. Ltd | Tynehead | Cumberland | 1881 | BT31 | 2902 | 16131 |
| Tynewdd & Moel Golomen Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1885 | BT31 | 3550 | 21689 |
| Tywarnhaile Mine Ltd | Porthtowan | Cornwall | 1903 | BT31 | 10214 | 76620 |
| Tywarnhaile Mining Co. Ltd | Porthtowan | Cornwall | 1907 | BT31 | 12120 | 94955 |
| Tywarnhaile Syndicate Ltd | Porthtowan | Cornwall | 1905 | BT31 | 11169 | 85215 |
| Ucha United Mines Ltd | Mold | Flintshire | 1881 | BT31 | 2772 | 15112 |
| Ukulunda Mining & Smelting Co. Ltd | 1889 | BT31 | 4458 | 29050 | ||
| Ulpha Copper Mining Co. Ltd | Cumberland | 1885 | BT31 | 3537 | 21590 | |
| Ulster Granite Quarries Ltd | Ireland | 1907 | BT31 | 12065 | 94351 | |
| Ulu-Backau Tin Mining Co. Ltd | 1909 | BT31 | 12730 | 102338 | ||
| Ulundi Mining Leases Ltd | 1915 | BT31 | 22708 | 139309 | ||
| Ulverston Mining Co. Ltd | Ulverston | Lancashire | 1873 | BT31 | 1806 | 6929 |
| Umtali (Mashona) Land & Prospecting Syndicate Ltd | 1895 | BT31 | 6202 | 43957 | ||
| Umtali Mines & Estates Co. Ltd | 1900 | BT31 | 8823 | 64741 | ||
| Unified Diamond Mines Ltd | 1885 | BT31 | 3520 | 21454 | ||
| Union Consolidated Drift Mines Ltd | 1887 | BT31 | 3962 | 25150 | ||
| Union Jack Consolidated Mines Ltd | 1903 | BT31 | 10504 | 79282 | ||
| Union Jack Consolidated Mines Ltd | 1899 | BT31 | 8717 | 63714 | ||
| Union Lead Co. Ltd | 1888 | BT31 | 4296 | 27877 | ||
| Union Mining & Smelting Co. Ltd | 1919 | BT31 | 25245 | 160736 | ||
| Union Mining & Smelting Co. Ltd | 1919 | BT31 | 25245 | 160736 | ||
| Union Tin Smelting Co. | BT41 | 702 | 3824 | |||
| Union Zinc Mining Co. Ltd | 1918 | BT31 | 24228 | 151817 | ||
| United African Mining Corporation Ltd | 1927 | BT31 | 29781 | 220313 | ||
| United Cambrian Copper Mining Co. Ltd | Cardiganshire | 1883 | BT31 | 3211 | 18731 | |
| United Cams Lead Mining Co. Ltd | Kettlewell | Yorkshire | 1867 | BT31 | 1324 | 3452 |
| United Chrome Mines Syndicate Ltd | 1898 | BT31 | 7853 | 56222 | ||
| United Cornish Wolfram Properties Ltd | Cornwall | 1916 | BT31 | 23292 | 144028 | |
| United Diamond Mining Co: Old De Beers Mine Ltd | South Africa | 1884 | BT31 | 3371 | 20107 | |
| United East Pant Du Lead Mining Co. Ltd | Mold | Flintshire | 1890 | BT31 | 4841 | 32105 |
| United German Copper Mines Ltd | 1899 | BT31 | 8775 | 64272 | ||
| United Irish Mining Co. Ltd | 1913 | BT31 | 14139 | 130205 | ||
| United Irish Mining Company Ltd | Ireland | 1913 | BT31 | 14139 | 130205 | |
| United Lead Mining Co. Ltd | Wales | 1876 | BT31 | 2252 | 10739 | |
| United Mercury Mines of Granada Ltd | 1903 | BT31 | 10149 | 76086 | ||
| United Mexican Mines Association Ltd | Mexico | 1898 | BT31 | 8113 | 58553 | |
| United Mexican Mines Ltd | Mexico | 1895 | BT31 | 6199 | 43932 | |
| United Mexican Mining Co. Ltd | Mexico | 1862 | BT31 | 652 | 2744 | |
| United Minera Mining Co. Ltd | Minera | Denbighshire | 1897 | BT31 | 7439 | 52847 |
| United Mines Co. Ltd | Gwennap | Cornwall | 1875 | BT31 | 14519 | 9187 |
| United Mines Ore Reduction Co. Ltd | Cornwall | 1894 | BT31 | 6000 | 42353 | |
| United Mining & Chemical Industries Ltd | 1930 | BT31 | 30595 | 245819 | ||
| United Mining & Finance Corporation Ltd | 1907 | BT31 | 11925 | 92902 | ||
| United Mining Corporation Ltd | 1925 | BT31 | 29304 | 209522 | ||
| United Newry Granite Company Ltd | Ireland | 1900 | BT31 | 9168 | 67954 | |
| United Rhiwarth & Pengwern Mining Co | Llangynog | Montgomeryshire | 1856 | BT31 | 125 | 401 |
| United Rhiwarth & Pengwern Mining Co | Llangynog | Montgomeryshire | BT41 | 709 | 3847 | |
| United Shepherds Wheal Rose Ltd | Perranzabuloe | Cornwall | 1881 | BT31 | 2799 | 15326 |
| United Silver Lead Mines Co. Ltd | Flintshire | 1891 | BT31 | 5173 | 34962 | |
| United Spanish Copper Mines Ltd | Spain | 1899 | BT31 | 8440 | 61427 | |
| United States Diamond Mining Syndicate Ltd | 1914 | BT31 | 22206 | 135197 | ||
| United States General Smelting & Mining Co. Ltd | U.S.A. | 1872 | BT31 | 1739 | 6420 | |
| United States of Colombia Mining & Finance Corporation Ltd | 1909 | BT31 | 12694 | 101916 | ||
| United Van Consols & Glyn Lead & Barytes Mining Co. Ltd | Llanidloes Without | Montgomeryshire | 1874 | BT31 | 2038 | 8864 |
| United Wallaroo & Moonta Mines Co. Ltd | 1868 | BT31 | 1420 | 4118 | ||
| United Welsh Mining Co. Ltd | Wales | 1858 | BT31 | 363 | 1332 | |
| United Welsh Mining Co. Ltd | Wales | BT41 | 710 | 3856 | ||
| Universal Mining & Enterprises Ltd | 1914 | BT31 | 22385 | 136616 | ||
| Upper Platte Mining & Smelting Co. Ltd | 1878 | BT31 | 2427 | 12265 | ||
| Uranium Mines Ltd | St Stephen in Brannel | Cornwall | 1889 | BT31 | 4555 | 29836 |
| Uranium Radium Mines Development Syndicate Ltd | Cornwall | 1904 | BT31 | 10565 | 79861 | |
| Uruguay Mining Syndicate Ltd | Uruguay | 1907 | BT31 | 12062 | 94319 | |
| Utah Cottonwood Mining & Smelting Co. Ltd | 1872-1875 | BT2 | 443 | |||
| Utah Silver Lead Mining Co. Ltd | Utah | U.S.A. | 1873 | BT31 | 1821 | 7048 |
| Utah Silver Mining Co. Ltd | Utah | U.S.A. | 1871 | BT31 | 1614 | 5467 |
| Ute & Ulay Mines Ltd | 1889 | BT31 | 4637 | 30457 | ||
| Vaal-Hart Rivers Diamond Prospecting Syndicate Ltd | 1906 | BT31 | 11707 | 90656 | ||
| Vachwen Silver Lead Mining Co. Ltd | Montgomeryshire | 1872 | BT31 | 1684 | 6004 | |
| Val Barbina (Italian) Nickel Mining Co. Ltd | Italy | 1872 | BT31 | 1690 | 6041 | |
| Val de Flores Tin Mining Syndicate Ltd | 1907 | BT31 | 12039 | 94079 | ||
| Val de Travers Asphalte Co. Ltd | London | 1870 | BT31 | 1529 | 4834 | |
| Val D’Elsa Copper Co. Ltd | 1888-1900 | BT2 | 1697 | |||
| Val Sassam Mines Co. Ltd | Switzerland | 1865 | BT31 | 1075 | 1969C | |
| Vale Mill Cotton Spinning Manufacturing & Mining Co. Ltd | 1874 | BT31 | 2046 | 8942 | ||
| Vale of Clwyd Mining Co. Ltd | Rhyl | Flintshire | BT41 | 725 | 3895 | |
| Vale of Clwyd Mining Co. Ltd | Rhyl | Flintshire | 1859 | BT31 | 421 | 1627 |
| Vale of Conway Lead Mining Co. Ltd | Conwy | Caernarvonshire | 1876 | BT31 | 2258 | 10790 |
| Vale of Rheidol Silver Lead Mining Co. Ltd | Devil’s Bridge | Cardiganshire | 1867 | BT31 | 1321 | 3426 |
| Valencia Slate Co. | Ireland | BT41 | 725 | 3897 | ||
| Valencia Slate Slab Co. Ltd | Ireland | 1864 | BT31 | 883 | 933C | |
| Valgodemard Mining Co. Ltd | 1863 | BT31 | 800 | 529C | ||
| Vallauria Silver Lead Mining Co. Ltd | Wales | 1874 | BT31 | 2039 | 8871 | |
| Valley Prospecting Syndicate Ltd | 1914 | BT31 | 22249 | 135576 | ||
| Vallongo Antimony Co. Ltd | 1906 | BT31 | 17708 | 88034 | ||
| Van Consols Lead & Barytes Mining Co. Ltd | Llanidloes | Montgomeryshire | 1869 | BT31 | 1465 | 4427 |
| Van Mines Ltd | Llanidloes | Montgomeryshire | 1902 | BT31 | 10005 | 74760 |
| Van Mining Co. Ltd | Llanidloes | Montgomeryshire | 1869 | BT31 | 1444 | 4284 |
| Van Syndicate Ltd | Llanidloes | Montgomeryshire | 1895 | BT31 | 6482 | 45655 |
| Van United Lead Mining Co. Ltd | Llangurig | Montgomeryshire | 1869 | BT31 | 1487 | 4572 |
| Vancouver Smelting Co. Ltd | British Columbia | Canada | 1898 | BT31 | 8030 | 57808 |
| Van-Roi Mining Co. Ltd | 1908 | BT31 | 18488 | 98777 | ||
| Varaldso Mining Co. Ltd | 1867 | BT31 | 1340 | 3549 | ||
| Vaughan Mines Co. Ltd | Goginan | Cardiganshire | 1869 | BT31 | 1463 | 4413 |
| Velvet Mines Ltd | 1898 | BT31 | 8042 | 57917 | ||
| Velvet Portland Mine Ltd | 1904 | BT31 | 10544 | 79675 | ||
| Velvet Rossland Mine Ltd | 1902 | BT31 | 9744 | 72587 | ||
| Velvet Rossland Mine Ltd | 1900 | BT31 | 8970 | 66215 | ||
| Venezuela Mines Acquisition Syndicate Ltd | 1896 | BT31 | 6684 | 46999 | ||
| Venezuelan Mines Ltd | 1888 | BT31 | 4157 | 26848 | ||
| Ventanas Mining & Exploration Co. Ltd | 1907 | BT31 | 31960 | 91867 | ||
| Ventonwyn Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | 1885 | BT31 | 3573 | 21897 |
| Vera Smelting Co. Ltd | 1891 | BT31 | 5207 | 35272 | ||
| Verdal Nickel Mining Co. Ltd | 1882 | BT31 | 3071 | 17519 | ||
| Veredas Lead Mining Co. Ltd | 1907 | BT31 | 12145 | 95260 | ||
| Vermont Mine Syndicate Co. Ltd | 1885 | BT31 | 3518 | 21438 | ||
| Victor Emmanuel Mining Co. Ltd | Italy | 1858 | BT31 | 366 | 1344 | |
| Victor Emmanuel Mining Co. Ltd | Italy | 1858 | BT41 | 726 | 3903 | |
| Victor Lead Mining Co. Ltd | Mold | Flintshire | 1877 | BT31 | 2375 | 11757 |
| Victoria (London) Mining Co. Ltd | Victoria | Australia | 1860 | BT31 | 510 | 2028 |
| Victoria (South Devon) Mining Co. Ltd | Ashburton | Devon | 1869 | BT286 | 177 | |
| Victoria Diamond Mining Co. of De Beer Ltd | 1881 | BT31 | 2825 | 15498 | ||
| Victoria Exploration Syndicate Ltd | 1898 | BT31 | 8143 | 58838 | ||
| Victoria Mineral Concession Ltd | 1892 | BT31 | 5306 | 36302 | ||
| Victoria Mining Co | BT41 | 726 | 3910 | |||
| Victoria Mining Co. Ltd | Bolton by Bowland | Yorkshire | 1869 | BT31 | 1470 | 4469 |
| Victoria Mining Co. Ltd | 1887 | BT31 | 3964 | 25159 | ||
| Victoria Silver Lead & Zinc Co. Ltd | Victoria | Australia | 1861 | BT31 | 571 | 2348 |
| Victoria Silver Lead Mining Co. Ltd | Wales | 1870 | BT31 | 1566 | 5100 | |
| Victoria Silver Mines of San Gabriel Ltd | 1887 | BT31 | 3952 | 25055 | ||
| Victoria Tin Mining Co | St Stephen in Brannel | Cornwall | 1846 | BT41 | 727 | 3914 |
| Victoria Tin Mining Co. Ltd | Cornwall | 1856 | BT31 | 195 | 586 | |
| Victorian Mines Syndicate Ltd | 1890 | BT31 | 4856 | 32232 | ||
| Victory & Triumph Mines Development Syndicate Ltd | 1897 | BT31 | 7676 | 54796 | ||
| Vigra & Clogau Copper Mining Co. Ltd | Llanaber | Merionethshire | BT41 | 728 | 3916 | |
| Vigra & Clogau Copper Mining Co. Ltd | Llanaber | Merionethshire | 1859 | BT31 | 385 | 1437 |
| Vilches Mines Ltd | 1902 | BT31 | 9642 | 71666 | ||
| Villagarcia Lead Mine Ltd | 1912 | BT31 | 13922 | 122728 | ||
| Villagarcia Lead Mine, Ltd | 1912 | BT31 | 13922 | 122728 | ||
| Villaricos Silver Lead Mining & Smelting Co. Ltd | 1884 | BT31 | 3359 | 20020 | ||
| Villecelle Copper Mining Co. Ltd | 1869 | BT31 | 1451 | 4326 | ||
| Vincent Tin Mining Co. Ltd | Altarnun | Cornwall | 1880 | BT31 | 2630 | 13941 |
| Viola Co. Ltd | Idaho | U.S.A. | 1886 | BT31 | 3706 | 23055 |
| Viola Mining & Smelting Co. Ltd | 1886 | BT31 | 3596 | 22104 | ||
| Virneberg Copper Mining Co. Ltd | Rhenish Prussia | Germany | 1877 | BT31 | 2323 | 11270 |
| Virtuous Lady Mining Co. Ltd | Buckland Monachorum | Devon | 1869 | BT286 | 179 | |
| Viseu Tin Mining Co. Ltd | 1926 | BT31 | 32777 | 216566 | ||
| Voel Mines (Merioneth) Ltd | Dolgellau | Merionethshire | 1900 | BT31 | 9085 | 67251 |
| Vogelsfontein Diamond Mine Ltd | South Africa | 1907 | BT31 | 11835 | 91939 | |
| Volberg Mining Co. Ltd | 1871 | BT31 | 1661 | 5833 | ||
| Volta Mining Syndicate Ltd | 1925 | BT31 | 29359 | 210622 | ||
| Vron Lead Mining Co. Ltd | Halkyn | Flintshire | 1874 | BT31 | 2050 | 8981 |
| Vron United Silver Lead Mining Co. Ltd | Halkyn | Flintshire | 1870 | BT31 | 1569 | 5113 |
| Vryburg Prospecting Syndicate Ltd | 1889 | BT31 | 4551 | 29813 | ||
| Vukan Mines Ltd | 1894 | BT31 | 5810 | 40765 | ||
| Vulcano Mining Co. Ltd | 1860 | BT31 | 494 | 1956 | ||
| Vulcano Mining Co. Ltd | BT41 | 728 | 3920 | |||
| W. Briggs & Company (Sheffield) Ltd | 1922 | BT31 | 27605 | 186086 | ||
| Wadhurst Iron Stone Mining Co. Ltd | BT41 | 728 | 3921 | |||
| Waenlas Mining Co. Ltd | Whitford | Flintshire | BT41 | 728 | 3922 | |
| Waenlas Mining Co. Ltd | Mold | Flintshire | 1859 | BT31 | 405 | 1548 |
| Waihi Romulus Prospecting Syndicate Ltd | 1909 | BT31 | 12840 | 103905 | ||
| Waldeck Iron Works Mining & Smelting Co. Ltd | 1865 | BT31 | 1111 | 2176C | ||
| Waldegrave Lead Smelting Co. Ltd | Chewton Mendip | Somerset | 1868 | BT31 | 1398 | 3964 |
| Wales Exploration Syndicate Ltd | Wales | 1907 | BT31 | 11946 | 93114 | |
| Walkham & Poldice Tin Copper & Silver Lead Mining Co. Ltd | Tavistock | Devon | 1862 | BT31 | 645 | 2708 |
| Walkham United Mines Ltd | Whitchurch | Devon | 1881 | BT286 | 529 | |
| Walkham Valley Tin Mining Co. Ltd | Whitchurch | Devon | 1880 | BT286 | 480 | |
| Wallside Holywell Lead Co. Ltd | Holywell | Flintshire | 1906 | BT31 | 11769 | 91272 |
| Walreddon Mining Co. Ltd | Whitchurch | Devon | 1871 | BT286 | 245 | |
| Waltham Mine Ltd | 1903 | BT31 | 17053 | 77728 | ||
| Wandilta Copper Mines Ltd | 1900 | BT31 | 9240 | 68602 | ||
| Wardlow Mines Co. Ltd | Derbyshire | 1906 | BT31 | 11689 | 90493 | |
| Warreuta Copper Mine Co. Ltd | 1866 | BT31 | 1242 | 2939 | ||
| Warton & Silverdale Mining Co. Ltd | Silverdale | Lancashire | 1879 | BT31 | 2540 | 13185 |
| Warton Mining & Colour Co. Ltd | Silverdale | Lancashire | 1889 | BT31 | 4382 | 28475 |
| Wassau (Western) Mines Ltd | Gold Coast | 1901 | BT31 | 9519 | 70722 | |
| Wassau Prospecting Syndicate Ltd | 1901 | BT31 | 9420 | 69996 | ||
| Wassaw West Amalgamated Mines Ltd | Gold Coast | 1901 | BT31 | 9547 | 70948 | |
| Watchet Ore Mining, Salvage, & Shipbreaking Co. Ltd | Watchet | Somerset | 1924 | BT31 | 28761 | 201299 |
| Waterberg (Transvaal) Land Trading & Prospecting Co. Ltd | Transvaal | South Africa | 1889 | BT31 | 4576 | 29960 |
| Waterberg Prospecting Syndicate Ltd | 1888 | BT31 | 4300 | 27915 | ||
| Waterfall Prospecting Co. Ltd | 1895 | BT31 | 6407 | 45231 | ||
| Watergate Refractory Co. Ltd | 1920 | BT31 | 26104 | 169376 | ||
| Waterhouse Lead Mining Co. Ltd | Warden | Durham | 1880 | BT31 | 2599 | 13690 |
| Watermouth Great Silver Lead Mining Co. Ltd | Berrynarbor | Devon | BT41 | 736 | 3961 | |
| Watermouth Great Silver Lead Mining Co. Ltd | Berrynarbor | Devon | 1859 | BT31 | 441 | 1702 |
| Waverley Mine Ltd | 1897 | BT31 | 7331 | 51941 | ||
| Waverley Trust & Trading Co. Ltd | 1895-1923 | BT2 | 3046 | |||
| Wear Steel Co. Ltd | 1889 | BT31 | 4234 | 27432 | ||
| Weardale Barytes & Mining Co. Ltd | Weardale | Durham | 1918 | BT31 | 24140 | 151110 |
| Weardale Lead Co. Ltd | Weardale | Durham | 1883 | BT31 | 3183 | 18489 |
| Weardale Minerals Co. Ltd | Weardale | Durham | 1882 | BT31 | 2995 | 16849 |
| Weardale Mines Ltd | Weardale | Durham | 1880 | BT31 | 2642 | 14027 |
| Welcome Hill (Moel y Groesau) Mines Ltd | Wales | 1902 | BT31 | 9966 | 74385 | |
| Welcome Mining Appliances Ltd | 1913 | BT31 | 21468 | 129076 | ||
| Wellington Copper Mine Co * | MN | 1856 | BT41 | 739 | 3986 | |
| Wellington Copper Mine Co. Ltd | 1856 | BT31 | 58 | 227 | ||
| Wellington Mining Co. Ltd | Wales | 1862 | BT31 | 614 | 2576 | |
| Welsh Copper Mining Syndicate Ltd | Wales | 1902 | BT31 | 9845 | 73378 | |
| Welsh Foxdale Mine Ltd | Llanrwst | Caernarvonshire | 1893 | BT31 | 5704 | 39873 |
| Welsh Manganese Co. Ltd | Dolgellau | Merionethshire | 1889 | BT31 | 4466 | 29115 |
| Welsh Manganese Co. Ltd | Dolgellau | Merionethshire | 1906 | BT31 | 11624 | 89827 |
| Welsh Mining Corporation Ltd | Wales | 1892 | BT31 | 5281 | 36038 | |
| Welsh Mining Syndicate Ltd | Wales | 1900 | BT31 | 9197 | 68219 | |
| Welsh Potosi Lead & Copper Mining Co | Tal-y-bont | Cardiganshire | 1853 | BT41 | 741 | 3997 |
| Welsh Potosi Lead & Copper Mining Co * | Tal-y-bont | Cardiganshire | 1857 | BT31 | 272 | 920 |
| Welsh Potosi Silver Lead & Copper Mining Co | Tal-y-bont | Cardiganshire | BT41 | 738 | 3983 | |
| Welsh Van Mining Co. Ltd | Llangurig | Montgomeryshire | 1916 | BT31 | 23331 | 144304 |
| Wemyss Mine Ltd | Llanfihangel | Cardiganshire | 1880 | BT31 | 2648 | 14074 |
| Wemyss Mine Ltd | Devil’s Bridge | Cardiganshire | 1884 | BT31 | 3392 | 20317 |
| Wensleydale Mining Co * | Bainbridge | Yorkshire | 1858 | BT41 | 742 | 4004 |
| Wensleydale Mining Co. Ltd | Bainbridge | Yorkshire | 1858 | BT31 | 368 | 1352 |
| Wentnor Mining Co. Ltd | Shelve | Shropshire | 1860 | BT31 | 512 | 2041 |
| Wescott Mining Co. Ltd | 1869 | BT31 | 1491 | 4598 | ||
| Wesphalian Silver Lead & Copper Mining Co. Ltd | 1868 | BT31 | 1390 | 3911 | ||
| West African Mines Acquisition Ltd | Africa | 1900 | BT31 | 9230 | 68511 | |
| West African Mining & Trading Association Ltd | Africa | 1882 | BT31 | 3077 | 17566 | |
| West African Mining Corporation Ltd | Africa | 1936 | BT31 | 33682 | 320250 | |
| West African Rand Mines Ltd | Africa | 1901 | BT31 | 9421 | 70019 | |
| West Alfred Consols Mine Co. Ltd | Phillack | Cornwall | 1861 | BT31 | 576 | 2381 |
| West Allt y Crib Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1872 | BT31 | 1712 | 6203 |
| West Appletree Mining Co. Ltd | Charlestown | Cornwall | 1873 | BT286 | 333 | |
| West Assheton Mining Co. Ltd | Abersoch | Caernarvonshire | 1875 | BT31 | 2083 | 9287 |
| West Australian Chamber of Mines Ltd | Australia | 1898 | BT31 | 8126 | 58694 | |
| West Australian Chamber of Mines Ltd | Australia | 1896 | BT31 | 7153 | 50475 | |
| West Australian Mine Owners’ Exploration Syndicate Ltd | Australia | 1894 | BT31 | 5978 | 42171 | |
| West Australian Mines Development Syndicate Ltd | Australia | 1895 | BT31 | 6170 | 43720 | |
| West Beam Mining Co. Ltd | Ashburton | Devon | 1861 | BT31 | 577 | 2384 |
| West Beaver Ltd | Ontario | Canada | 1889 | BT31 | 4431 | 28839 |
| West British Development Syndicate Ltd | Ireland | 1905 | BT31 | 17535 | 85585 | |
| West Bryn Celyn Lead Mining Co. Ltd | Mold | Flintshire | 1873 | BT31 | 1847 | 7244 |
| West Bryngwiog Mining Co. Ltd | Halkyn | Flintshire | 1861 | BT31 | 530 | 2130 |
| West Canada Mining Co. Ltd | Canada | BT41 | 742 | 4008 | ||
| West Canada Mining Co. Ltd | Canada | 1860 | BT31 | 463 | 1790 | |
| West Caradon Mining Co. Ltd | St Cleer | Cornwall | 1872 | BT286 | 268 | |
| West Carbery Copper Estates Ltd | Ireland | 1908 | BT31 | 12270 | 96624 | |
| West Clifford United Tin & Copper Mining Co. Ltd | Gwennap | Cornwall | 1864 | BT286 | 33 | |
| West Clogau Mining Co. Ltd | Llanaber | Merionethshire | 1862 | BT31 | 634 | 2659 |
| West Combemartin Silver Lead Mining Co. Ltd | Combe Martin | Devon | 1876 | BT286 | 417 | |
| West Cornwall Consols Tin & Copper Mining Co. Ltd | Chacewater | Cornwall | 1863 | BT286 | 11 | |
| West Cornwall Granite Co. Ltd | Cornwall | 1867 | BT286 | 157 | ||
| West Cornwall Ironstone Co. Ltd | Cornwall | 1871 | BT286 | 213 | ||
| West Cornwall Mining Association Ltd | Cornwall | 1880 | BT286 | 486 | ||
| West Cornwall Tailings Ltd | Carnkie | Cornwall | 1928 | BT31 | 30239 | 231069 |
| West Craven Moor Lead Co. Ltd | Appletreewick | Yorkshire | 1875 | BT31 | 2126 | 9721 |
| West Cumberland Consols Ltd | Grasmere | Cumberland | 1875 | BT31 | 2157 | 10008 |
| West Cumberland Iron & Steel Co. Ltd | Cumberland | 1872 | BT31 | 1766 | 6618 | |
| West Cumberland Silver Lead Mining Co. Ltd | Cumberland | 1865-1875 | BT2 | 217 | ||
| West Cwm Erfin Mine (New) Co. Ltd | Goginan | Cardiganshire | 1869 | BT31 | 1467 | 4447 |
| West Cwm Erfin Mines Co. Ltd | Goginan | Cardiganshire | 1865 | BT31 | 1081 | 2007C |
| West Cwmsymlog Mining Co. Ltd | Cwmsymlog | Cardiganshire | 1866 | BT31 | 1279 | 3193 |
| West Cwymstwith Mining Co. Ltd | Devil’s Bridge | Cardiganshire | 1876 | BT31 | 2230 | 10564 |
| West Devon Consolidated Copper Mining Co. Ltd | Calstock | Cornwall | 1858 | BT31 | 326 | 1146 |
| West Devon Consolidated Copper Mining Co. Ltd | Calstock | Cornwall | 1858 | BT41 | 743 | 4010 |
| West Dolcoath Copper Mining Co. Ltd | Gwinear | Cornwall | 1858 | BT31 | 328 | 1161 |
| West Dolcoath Copper Mining Co. Ltd | Gwinear | Cornwall | BT41 | 743 | 4011 | |
| West Dolcoath Exploration Syndicate Ltd | Camborne | Cornwall | 1912 | BT31 | 21090 | 125821 |
| West Dolcoath Mine Ltd | Gwinear | Cornwall | 1897 | BT31 | 15715 | 50731 |
| West Dolcoath Tin & Copper Mining Co. Ltd | Camborne | Cornwall | 1872 | BT286 | 290 | |
| West Donegal Sand & Mineral Syndicate Ltd | Ireland | 1920 | BT31 | 25844 | 166774 | |
| West End Diamond Mining Co. of Dutoitspan Ltd | 1881 | BT31 | 2889 | 16013 | ||
| West Esgair Lle Mining Co. Ltd | Llanbadarnfawr | Cardiganshire | 1870 | BT31 | 1537 | 4888 |
| West Fedw Mining Co. Ltd | Llanidloes | Montgomeryshire | 1870 | BT31 | 1562 | 5075 |
| West Frongoch Mine Co. Ltd | Devil’s Bridge | Cardiganshire | 1890 | BT31 | 4698 | 30949 |
| West Goginan Silver Lead Mining Co. Ltd | Goginan | Cardiganshire | 1872 | BT31 | 1710 | 6188 |
| West Great Consols Mining Co. Ltd | Calstock | Cornwall | 1871 | BT286 | 237 | |
| West Great Polgooth Mining Co | St Austell | Cornwall | 1873 | BT286 | 346 | |
| West Great St George Copper Mining Co. Ltd | St Agnes | Cornwall | 1866 | BT286 | 117 | |
| West Great Work Mining Co. Ltd | Breage | Cornwall | 1874 | BT286 | 376 | |
| West Halkyn Mining Co. Ltd | Halkyn | Flintshire | 1887 | BT31 | 3943 | 24994 |
| West Havan Silver Lead Mining Co. Ltd | Wales | 1870 | BT31 | 1535 | 4877 | |
| West Hendre Lead Mining Co. Ltd | Rhydymwyn | Flintshire | 1900 | BT31 | 9299 | 69127 |
| West Holway Lead Co. Ltd | Holywell | Flintshire | 1879 | BT31 | 2523 | 13047 |
| West Isles Mining Co. Ltd | 1869 | BT31 | 1490 | 4596 | ||
| West Jewell Tin Mining Co. Ltd | St Day | Cornwall | 1870 | BT286 | 192 | |
| West Kaime Copper Mining Co. Ltd | Renfrewshire | 1862-1886 | BT2 | 101 | ||
| West Kitty Mines Ltd | St Agnes | Cornwall | 1910 | BT31 | 19233 | 107572 |
| West Kitty Mining Co. | St Agnes | Cornwall | 1910 | BT31 | 19179 | 106922 |
| West Kootenay (B.C.) Exploring & Mining Co. Ltd | nd | BT2 | 3461 | |||
| West Kootenay Mining Corporation Ltd | 1910 | BT31 | 19483 | 109745 | ||
| West Lisburne Mines Ltd | Lledrod | Cardiganshire | 1880 | BT31 | 2678 | 14326 |
| West Llangynog Silver Lead Mine Ltd | Pennant | Montgomeryshire | 1871 | BT31 | 1670 | 5912 |
| West Llyn y Pandy Mining Co. Ltd | Cilcain | Flintshire | 1866 | BT31 | 1219 | 2801C |
| West Milwr Silver Lead Mining Co. Ltd | Holywell | Flintshire | 1872 | BT31 | 1778 | 6709 |
| West Minera Mining Co. Ltd | Brynamwyn | Denbighshire | 1881 | BT31 | 2760 | 15034 |
| West Nanty Mine Co. Ltd | Llanidloes | Montgomeryshire | 1863 | BT31 | 817 | 621C |
| West of England Iron Co. Ltd | 1858 | BT31 | 359 | 1313 | ||
| West of England Iron Ore Co. Ltd | 1868 | BT31 | 1398 | 3961 | ||
| West of England Lead Smelting Co. Ltd | Devon | 1861 | BT31 | 533 | 2145 | |
| West of England Manganese Mining Co. Ltd | Lamerton | Devon | 1881 | BT31 | 2764 | 15062 |
| West of England Mineral Co. Ltd | Devon | 1860 | BT31 | 504 | 1992 | |
| West of England Mines Syndicate Ltd | Devon | 1901 | BT31 | 9389 | 69734 | |
| West of England Nickel & Cobalt Mines Syndicate Ltd | Cornwall | 1876 | BT286 | 438 | ||
| West of England Smelting & Refining Co. Ltd | 1891 | BT31 | 5013 | 33597 | ||
| West of England Spathic Iron & Lead Smelting Co. Ltd | Newlyn East | Cornwall | 1878 | BT286 | 456 | |
| West of England Tin Corporation Ltd | Calstock | Cornwall | 1912 | BT31 | 13878 | 121608 |
| West of Ireland Development Syndicate Ltd | Ireland | 1913 | BT31 | 21852 | 132291 | |
| West Pant y Go Silver Lead Mining Co. Ltd | Halkyn | Flintshire | 1870 | BT31 | 1524 | 4802 |
| West Pateley Bridge Lead Mines Co. Ltd | Appletreewick | Yorkshire | 1876 | BT31 | 2194 | 10281 |
| West Polberro Tin & Copper Mining Co. Ltd | St Agnes | Cornwall | 1873 | BT286 | 324 | |
| West Porkellis Tin Mining Co. Ltd | Porkellis | Cornwall | 1869 | BT286 | 175 | |
| West Port Nigel Lead & Barytes Syndicate Mining Co. Ltd | Aberdaron | Caernarvonshire | 1881 | BT31 | 2865 | 15798 |
| West Prince of Wales Mine Ltd | Calstock | Cornwall | 1902 | BT31 | 9639 | 71641 |
| West Prince Patrick & Old Silver Rake Silver Lead Mining Co. Ltd | Halkyn | Flintshire | 1875 | BT31 | 2102 | 9487 |
| West Randt Estates & Land Co. Ltd | South Africa | 1889 | BT31 | 4545 | 29766 | |
| West Rhosesmor & East Coed yr Hendre Lead Mining Co * | Northop | Flintshire | 1863 | BT31 | 846 | 771C |
| West Rhoswyddol Consolidated Lead Mining Co. Ltd | Penegoes | Montgomeryshire | 1870 | BT31 | 1520 | 4771 |
| West Roskear Copper Mining Co. Ltd | Camborne | Cornwall | 1876 | BT286 | 427 | |
| West Seton Burrows Ltd | Camborne | Cornwall | 1898 | BT31 | 8065 | 58140 |
| West Silver Bank Mining Co. Ltd | Rheidol Valley | Cardiganshire | 1861 | BT31 | 591 | 2459 |
| West Snailbeach Mining Co. Ltd | Chirbury | Shropshire | 1860 | BT31 | 506 | 2008 |
| West St Ives Consolidated Tin Mining Co. Ltd | Towednack | Cornwall | 1868 | BT286 | 161 | |
| West Stiperstones Mining Co. Ltd | Shelve | Shropshire | 1870 | BT31 | 1526 | 4813 |
| West Tankerville Mining Co. Ltd | Shelve | Shropshire | 1870 | BT31 | 1523 | 4794 |
| West Tokatea Syndicate Ltd | New Zealand | 1888 | BT31 | 4208 | 27226 | |
| West Trelawny Mining Co. Ltd | Gwennap | Cornwall | 1865 | BT286 | 91 | |
| West Vor & Leeds United Mining Co. Ltd | Breage | Cornwall | 1881 | BT31 | 2904 | 16148 |
| West Vor Mining Co. Ltd | Breage | Cornwall | 1878 | BT286 | 451 | |
| West Vownag Lead Mining Co. Ltd | Holywell | Flintshire | 1864 | BT31 | 942 | 1229C |
| West Wheal Fortune Tin Mining Co. Ltd | Cornwall | 1863 | BT286 | 19 | ||
| West Wheal Friendship Copper Mining Co. Ltd | Brentor | Devon | 1863 | BT286 | 9 | |
| West Wheal Grenville Mine Ltd | Crowan | Cornwall | 1888 | BT31 | 4020 | 25611 |
| West Wheal Margaret Mining Co. Ltd | Towednack | Cornwall | 1871 | BT286 | 217 | |
| West Wheal Martha Mining Co. Ltd | Stoke Climsland | Cornwall | 1863 | BT286 | 17 | |
| West Wheal Towan Tin & Copper Mine Co. Ltd | Porth Towan | Cornwall | 1880 | BT286 | 493 | |
| West Wheal Towan Tin & Copper Mining Co. Ltd | Porth Towan | Cornwall | 1890 | BT286 | 148 | |
| West Wye Valley Lead Mining Co. Ltd | Llangurig | Montgomeryshire | 1875 | BT31 | 2144 | 9903 |
| Western Abyssinian Mining Syndicate Ltd | Abyssinia | 1934 | BT31 | 33531 | 290561 | |
| Western Africa Malachite Copper Mines Co. Ltd | Africa | BT41 | 745 | 4023 | ||
| Western Africa Malachite Copper Mines Co. Ltd | Africa | 1858 | BT31 | 325 | 1141 | |
| Western Australian Smelting Co. Ltd | Australia | 1898 | BT31 | 8278 | 60114 | |
| Western Australian Smelting Co. Ltd | Australia | 1897 | BT31 | 7611 | 54334 | |
| Western Cornwall Mining Syndicate Ltd | Cornwall | 1907 | BT31 | 11959 | 93241 | |
| Western Land & Land Agency Co. Rio Del Norte Land & Mining Association | BT41 | 747 | 4032 | |||
| Western Mines Ltd | 1900 | BT31 | 8857 | 65125 | ||
| Western Mining Construction Co. Ltd | 1908 | BT31 | 12451 | 98830 | ||
| Western Prospecting Syndicate Ltd | 1899 | BT31 | 8763 | 64159 | ||
| Western Sinai Petroleum Prospecting Syndicate Ltd | 1911 | BT31 | 20381 | 119354 | ||
| Westminster Consols Ltd | Llanarmon | Denbighshire | 1883 | BT31 | 3269 | 19232 |
| Westminster Mining Co. Ltd | Llanarmon | Denbighshire | 1866 | BT31 | 1291 | 3265 |
| Westpanty Mwyn Mining Co. Ltd | Gwernaffield | Flintshire | 1864 | BT31 | 956 | 1303C |
| Westralia Mines Issuing Syndicate Ltd | 1896 | BT31 | 6750 | 47493 | ||
| Westralia Prospecting Syndicate Ltd | 1894 | BT31 | 5865 | 41181 | ||
| Westralian & General Mines Exploitation Co. Ltd | 1896 | BT31 | 6702 | 47109 | ||
| Westwood Prospecting Syndicate Ltd | 1902 | BT31 | 10057 | 75232 | ||
| Wharfedale Mining Co | Starbotton | Yorkshire | 1857 | BT41 | 754 | 4067 |
| Wharfedale Mining Co. Ltd | Starbotton | Yorkshire | 1857 | BT31 | 261 | 864 |
| Wheal Alfred James Tin & Copper Mining Co. Ltd | St Dennis | Cornwall | 1862 | BT31 | 614 | 2575 |
| Wheal Allen Silver Lead Mining Co. Ltd | St Pinnock | Cornwall | 1874 | BT286 | 372 | |
| Wheal Anna Maria Ltd | Constantine | Cornwall | 1908 | BT31 | 12510 | 99551 |
| Wheal Annie Tin Mine Ltd | Altarnun | Cornwall | 1901 | BT31 | 16647 | 70264 |
| Wheal Arthur Tin & Copper Mining Co. Ltd | Calstock | Cornwall | 1872 | BT286 | 271 | |
| Wheal Barbara Silver Lead & Copper Mining Co | St Teath | Cornwall | 1846 | BT41 | 754 | 4068 |
| Wheal Barnard Silver Tin & Copper Mining Co. Ltd | Calstock | Cornwall | 1873 | BT286 | 354 | |
| Wheal Basset Mine Co | Redruth | Cornwall | 1895 | BT31 | 6489 | 45692 |
| Wheal Bella Mining Co. Ltd | Cornwall | 1860 | BT31 | 498 | 1971 | |
| Wheal Bella Mining Co. Ltd | Cornwall | BT41 | 754 | 4069 | ||
| Wheal Benny Mining Co. Ltd | Calstock | Cornwall | 1883 | BT31 | 3107 | 17817 |
| Wheal Buller & Basset Ltd | Wendron | Cornwall | 1890 | BT31 | 4718 | 31128 |
| Wheal Buller Consols Ltd | Redruth | Cornwall | 1883 | BT286 | 12 | |
| Wheal Buller Consols Ltd | Redruth | Cornwall | 1883 | BT286 | 548 | |
| Wheal Calstock Eastern Sett Mining Co. Ltd | Calstock | Cornwall | 1876 | BT286 | 423 | |
| Wheal Camborne Ltd | Camborne | Cornwall | 1883 | BT286 | 16 | |
| Wheal Camborne Ltd | Camborne | Cornwall | 1883 | BT286 | 550 | |
| Wheal Castle Mines Ltd | St Just | Cornwall | 1882 | BT31 | 3062 | 17435 |
| Wheal Charlotte Consols Ltd | St Agnes | Cornwall | 1908 | BT31 | 12386 | 97960 |
| Wheal Coates Tin Mining Co. Ltd | St Agnes | Cornwall | 1871 | BT286 | 251 | |
| Wheal Coates United Tin Mines Ltd | St Agnes | Cornwall | 1880 | BT286 | 484 | |
| Wheal Colstock (Eastern Sett) Mining Co. Ltd | Cornwall | 1888 | BT286 | 88 | ||
| Wheal Commerce Tin Mine Ltd | St Austell | Cornwall | 1906 | BT31 | 11726 | 90870 |
| Wheal Concord Silver Lead & Copper Mining Co. Ltd | Sydenham Damerel | Devon | 1861 | BT41 | 754 | 4070 |
| Wheal Concord Silver Lead & Copper Mining Co. Ltd | Sydenham Damerel | Devon | 1860 | BT31 | 487 | 1924 |
| Wheal Curtis Mining Co | Crowan | Cornwall | 1865 | BT41 | 755 | 4071 |
| Wheal Darly Consols Ltd | Linkinhorne | Cornwall | 1880 | BT286 | 517 | |
| Wheal Dorothy Tin Mine Ltd | Altarnun | Cornwall | 1891 | BT31 | 5224 | 35449 |
| Wheal Elizabeth | St Mewan | Cornwall | 1881 | BT31 | 2814 | 15425 |
| Wheal Ellen (South Australia) Mining Co. Ltd | South Australia | Australia | 1860 | BT31 | 512 | 2042 |
| Wheal Emma Tin & Copper Mining Co. Ltd | Breage | Cornwall | 1872 | BT286 | 253 | |
| Wheal Fortune Mining Co. Ltd | St Mellion | Cornwall | 1880 | BT31 | 2646 | 14060 |
| Wheal Francis Tin Mining Co. Ltd | Cornwall | 1871 | BT286 | 241 | ||
| Wheal Friendship Co. Ltd | Marytavy | Devon | 1864 | BT286 | 57 | |
| Wheal George Lead Mining Co. Ltd | Bettws-y-Coed | Caernarvonshire | 1880 | BT31 | 2658 | 14154 |
| Wheal Gill Ltd | St Cleer | Cornwall | 1896 | BT31 | 15695 | 50161 |
| Wheal Grenville Mining Co. Ltd | Troon | Cornwall | 1906 | BT31 | 11536 | 88946 |
| Wheal Gurlyn Syndicate Ltd | Relubbus | Cornwall | 1903 | BT31 | 10324 | 77635 |
| Wheal Hampton Ltd | St Hilary | Cornwall | 1903 | BT31 | 10337 | 77771 |
| Wheal Hannibal Tin Mining Co. Ltd | Cornwall | 1873 | BT286 | 319 | ||
| Wheal Henry Helvellyn Lead Mining Co | Helvellyn | Cumberland | BT41 | 755 | 4072 | |
| Wheal Henry Helvellyn Lead Mining Co. Ltd | Helvellyn | Cumberland | 1857 | BT31 | 309 | 1074 |
| Wheal Henry Tin & Copper Co. Ltd | St Hilary | Cornwall | 1872 | BT286 | 270 | |
| Wheal Hony & Trelawny United Silver Lead Mining Co. Ltd | Menheniot | Cornwall | 1880 | BT31 | 2671 | 14249 |
| Wheal Hony & Trelawny United Silver Lead Mining Co. Ltd | Menheniot | Cornwall | 1880 | BT31 | 2671 | 14249 |
| Wheal Kitty & Penhalls United Ltd | St Agnes | Cornwall | 1906 | BT31 | 17884 | 90417 |
| Wheal Kitty Ltd | St Agnes | Cornwall | 1906 | BT31 | 11650 | 90068 |
| Wheal Kitty Tin Ltd | St Agnes | Cornwall | 1925 | BT31 | 32732 | 210760 |
| Wheal Lopes Copper Tin & Zinc Mining Co | Bickleigh | Devon | 1860 | BT41 | 755 | 4073 |
| Wheal Lopes Copper Tin & Zinc Mining Co. Ltd | Bickleigh | Devon | 1860 | BT31 | 451 | 1745 |
| Wheal Lucy Syndicate Ltd | Phillack | Cornwall | 1894 | BT286 | 166 | |
| Wheal Lucy Syndicate Ltd | Phillack | Cornwall | 1894 | BT286 | 604 | |
| Wheal Lucy Syndicate Ltd | Phillack | Cornwall | Not given | BT286 | 605 | |
| Wheal Mary Florence Mining Co. Ltd | Cornwall | 1865 | BT286 | 107 | ||
| Wheal Mary Hutchings Mining Co. Ltd | Plympton St Mary | Devon | 1873 | BT286 | 356 | |
| Wheal Mary Tin Mining Co. Ltd | St Dennis | Cornwall | 1873 | BT286 | 334 | |
| Wheal Merth Ltd | St Austell | Cornwall | 1905 | BT31 | 11307 | 86503 |
| Wheal Metal & Flow Co | Breage | Cornwall | 1895 | BT31 | 6277 | 44443 |
| Wheal Millet Mining Co. Ltd | Crowan | Cornwall | 1870 | BT286 | 202 | |
| Wheal Newton Ltd | St Mellion | Cornwall | 1877 | BT31 | 2300 | 11102 |
| Wheal Norris Mining Co. Ltd | St Cleer | Cornwall | 1866 | BT286 | 121 | |
| Wheal Norris United Mining Co. Ltd | St Cleer | Cornwall | 1868 | BT286 | 167 | |
| Wheal North Grylls Mining Co. Ltd | St Hilary | Cornwall | 1864 | BT286 | 39 | |
| Wheal Penrose & Unity Mines Co. Ltd | Sithney | Cornwall | 1865 | BT286 | 95 | |
| Wheal Prosper Co. Ltd | Lanivet | Cornwall | 1882 | BT31 | 3084 | 17645 |
| Wheal Prudence Copper Mining Co. Ltd | Perranzabuloe | Cornwall | 1861 | BT31 | 593 | 2471 |
| Wheal Reeth Mining & Exploration Syndicate Ltd | Lelant | Cornwall | 1906 | BT31 | 17672 | 87508 |
| Wheal Reeth Tin Ltd | Breage/Germoe | Cornwall | 1927 | BT31 | 35406 | 221283 |
| Wheal Rosa & Brown Willie Syndicate Ltd | Cornwall | 1892 | BT31 | 5324 | 36460 | |
| Wheal Ruby Tin Mining Co. Ltd | Ludgvan | Cornwall | 1872 | BT286 | 259 | |
| Wheal Silver & Lanteglos Mines Ltd | St Teath | Cornwall | 1881 | BT286 | 537 | |
| Wheal Sisters Mining Co. Ltd | Lelant | Cornwall | 1890 | BT31 | 4777 | 31611 |
| Wheal Speedwell Tin & Copper Mining Co. Ltd | Breage | Cornwall | 1872 | BT286 | 262 | |
| Wheal Tregembo Tin Mine Ltd | St Hilary | Cornwall | 1900 | BT31 | 31833 | 68462 |
| Wheal Tregoss Tin Mining Co. Ltd | Roche | Cornwall | 1872 | BT286 | 315 | |
| Wheal Trevenna Tin & Copper Mining Co. Ltd | St Neot | Cornwall | 1864 | BT286 | 73 | |
| Wheal Victoria Tin Mine Co. Ltd | Perranuthnoe | Cornwall | 1872 | BT286 | 310 | |
| Wheal Whisper Tin & Copper Mining Co. Ltd | Warleggan | Cornwall | 1872 | BT286 | 254 | |
| Wheal Wrey Ludcott & North Trelawny Mining Co. Ltd | St Ive | Cornwall | 1875 | BT286 | 397 | |
| Wheatleys Mining Investor Ltd | 1913 | BT31 | 14137 | 130156 | ||
| Whicham Mining Co. Ltd | Silecroft | Cumberland | 1880 | BT31 | 2730 | 14782 |
| Whimwell Copper Mines Ltd | 1900 | BT31 | 9161 | 67892 | ||
| Whinnah Mining Co. Ltd | Lamplugh | Cumberland | 1880 | BT31 | 2680 | 14346 |
| White Alice Tin Mine Ltd | Penmarth | Cornwall | 1913 | BT31 | 21188 | 126760 |
| White Bear Dredging & Hydraulic Mining Co. Ltd | 1913 | BT31 | 21290 | 127644 | ||
| White Cliff Lead Mining Co. Ltd | Llanrwst | Caernarvonshire | 1876 | BT31 | 2182 | 10204 |
| White Cliffs Opal Mines Ltd | 1896 | BT31 | 6874 | 48352 | ||
| White Rock Silver Mines Ltd | 1896 | BT31 | 6842 | 48140 | ||
| White Star Consolidated Mining Co. Ltd | 1882 | BT31 | 2968 | 16661 | ||
| White Works Mining Co. Ltd | St Day | Cornwall | 1868 | BT286 | 169 | |
| White Works Tin Mining Co. Ltd | Lydford | Devon | 1872 | BT286 | 252 | |
| Whitehaven Iron Mines Ltd | Whitehaven | Cumberland | 1871 | BT31 | 1588 | 5253 |
| Whitehead Mining & Smelting Co. Ltd | 1881 | BT31 | 14677 | 15259 | ||
| Whitewell Mining Co. Ltd | Forest of Bowland | Yorkshire | 1866 | BT31 | 1205 | 2731C |
| Whitworth Finance & Mining Corporation Ltd | 1927 | BT31 | 32816 | 220064 | ||
| Wilhelmina & New Phoenix Tin Mining Co. Ltd | Altarnun | Cornwall | 1887 | BT31 | 3997 | 25430 |
| William Briggs & Company (Sheffield) Ltd | 1900 | BT31 | 9060 | 67034 | ||
| Willoughby Lead Mining Co | Llanrwst | Caernarvonshire | 1853 | BT41 | 762 | 4097 |
| Willoughby Lead Mining Co. Ltd | Llanrhychwyn | Caernarvonshire | 1856 | BT31 | 24B | 119 |
| Willoughby Mining Co. Ltd | Llanrhaeadr | Montgomeryshire | 1871 | BT31 | 1612 | 5447 |
| Willow Bank Mining Co * | Tal-y-bont | Cardiganshire | 1856 | BT41 | 762 | 4098 |
| Willow Bank Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1856 | BT31 | 208 | 636 |
| Winamuck Silver Mining Co of Utah Ltd | Utah | U.S.A. | 1872 | BT31 | 1784 | 6744 |
| Winder Gill Mining Co. Ltd | Frizington | Cumberland | 1907 | BT31 | 18017 | 92320 |
| Windsor Clive Mineral Co. Ltd | Glamorganshire | 1877 | BT31 | 2332 | 11351 | |
| Winford Red Hematite Iron Ore Company Ltd | Winford | Somerset | 1872 | BT31 | 1749 | 6500 |
| Winnie Mine Co. Ltd | 1891 | BT31 | 5135 | 34663 | ||
| Wirksworth Mining Co. Ltd | Wirksworth | Derbyshire | 1929 | BT31 | 30432 | 236827 |
| Wisconsin Mining & Smelting Co. Ltd | Wisconsin | U.S.A. | 1861 | BT31 | 586 | 2431 |
| Wiseman’s Creek Copper Mining Co. Ltd | 1873 | BT31 | 1913 | 7822 | ||
| Witwatersrandt Central Milling & Prospecting Co. Ltd | South Africa | 1888 | BT31 | 4273 | 27718 | |
| Wolcott Copper Mining & Chemical Manufacturing Co. Ltd | 1876 | BT31 | 2229 | 10550 | ||
| Wolfram Ltd | Cornwall | 1904 | BT31 | 10931 | 82977 | |
| Wolfram Mines of Ribadavia Ltd | 1900 | BT31 | 8900 | 65543 | ||
| Wolfram Mining & Smelting Co. Ltd | 1909 | BT31 | 18933 | 104074 | ||
| Wolfram Mining & Smelting Co. Ltd | 1924 | BT31 | 28769 | 201413 | ||
| Wolfram Mining & Smelting Co. Ltd | 1909 | BT31 | 18933 | 104074 | ||
| Wolsingham Lead Co. Ltd | Frosterley | Durham | 1865 | BT31 | 1147 | 2395C |
| Wombwell Main Co. Ltd | Wombwell | Yorkshire | 1865 | BT31 | 38681 | 2036c |
| Wood Close & Polgooth United Tin Mining Co. Ltd | St Mewan | Cornwall | 1872 | BT286 | 285 | |
| Woodley Silver Lead Mining Co. Ltd | St Pinnock | Cornwall | 1872 | BT31 | 1764 | 6607 |
| Workington Haematite Iron Co. Ltd | Workington | Cumberland | 1856 | BT31 | 189 | 568 |
| Worthing Mining Co. Ltd | South Australia | Australia | 1849 | BT41 | 777 | 4168 |
| Worthing Mining Co. Ltd | South Australia | Australia | 1856 | BT31 | 119 | 382 |
| Wotherton Barytes & Lead Mining Co. Ltd | Chirbury | Shropshire | 1880 | BT31 | 2658 | 14151 |
| Wray Ferric Oxide Mine Ltd | Moretonhampstead | Devon | 1922 | BT31 | 27267 | 182340 |
| Wright’s Prospecting Syndicate Ltd | 1889 | BT31 | 4447 | 28959 | ||
| Wye Lead Mining Co. Ltd | Llangurig | Montgomeryshire | 1868 | BT31 | 1416 | 4094 |
| Wye Mine Ltd | Llangurig | Montgomeryshire | 1883 | BT31 | 3146 | 18183 |
| Wye Valley Lead Mining Co. Ltd | Llangurig | Montgomeryshire | 1874 | BT31 | 1996 | 8568 |
| Wymshay Lead Mining | 1862 | BT31 | 671 | 2848 | ||
| Wynaad Reduction & Smelting Corporation Ltd | India | 1881 | BT31 | 2900 | 16117 | |
| Wyndham Mining Co. Ltd | Wyndham | Cumberland | 1877 | BT31 | 14565 | 11342 |
| Wyoming Sweetwater Mining Co. Ltd | Wyoming | U.S.A. | 1870 | BT31 | 1566 | 5101 |
| Wythburn Lead Mining Co. Ltd | Grasmere | Cumberland | 1861 | BT31 | 589 | 2449 |
| X.Y. Prospecting & Developing Syndicate Ltd | 1893 | BT31 | 5626 | 39210 | ||
| Yampi Reward Copper Mine Ltd | 1916 | BT31 | 23358 | 144522 | ||
| Yana (Wassau) Mines Ltd | 1901 | BT31 | 9355 | 69473 | ||
| Yankee Girl Silver Mines Ltd | Colorado | U.S.A. | 1890 | BT31 | 4811 | 31894 |
| Yewthwaite & Mewlands United Mines Ltd | Keswick | Cumberland | 1885 | BT31 | 3568 | 21866 |
| Ynystudor Mining Co. Ltd | Taliesin | Cardiganshire | 1881 | BT31 | 2755 | 14985 |
| Yolanda Mining Corporation Ltd | 1912 | BT31 | 20821 | 123349 | ||
| York & Lancaster United Mines Co. Ltd | Rimington | Yorkshire | 1880 | BT31 | 2702 | 14554 |
| York Harbour Mine (Newfoundland) Ltd | Newfoundland | Canada | 1909 | BT31 | 12939 | 105330 |
| Yorke Peninsular Mining Co. Ltd | 1864 | BT31 | 1009 | 1598C | ||
| Yorkshire & Westmoreland Copper Co. Ltd | Westmorland | 1908 | BT31 | 12417 | 98356 | |
| Yorkshire Lead Mines Ltd | Marrick | Yorkshire | 1882 | BT31 | 2930 | 16339 |
| Yorkshire Mining Co | Appletreewick | Yorkshire | 1852 | BT41 | 781 | 4185 |
| Yorkshire Mining Co. Ltd* | Appletreewick | Yorkshire | 1856 | BT31 | 164 | 495 |
| Yorkshire Refractories Co. Ltd | Yorkshire | 1917 | BT31 | 23735 | 147761 | |
| Ystwith Lead Mining Co. Ltd | Cwmystwyth | Cardiganshire | 1880 | BT31 | 2602 | 13713 |
| Ytteroen Mining Co. Ltd | 1863 | BT31 | 869 | 864C | ||
| Yukon Placers Mines Ltd | 1897 | BT31 | 7519 | 53545 | ||
| Zacatecas Silver Mining Co. Ltd | 1866 | BT31 | 1269 | 3120 | ||
| Zamora Tin Mining Co. Ltd | Spain | 1861 | BT31 | 579 | 2394 | |
| Zapopan Mines Ltd | 1889 | BT31 | 4428 | 28821 | ||
| Zaragoza Copper & Zinc Mines Ltd | 1900 | BT31 | 9147 | 67790 | ||
| Zaruma Mining Corporation Ltd | 1913 | BT31 | 21205 | 126899 | ||
| Zeal Manor Mining Co. Ltd | South Tawton | Devon | 1859 | BT31 | 385 | 1438 |
| Zeal Manor Mining Co. Ltd | BT41 | 781 | 4188 | |||
| Zeehan Montana Mine Ltd | 1892 | BT31 | 15269 | 37579 | ||
| Zoutpansberg Consolidated Mines Ltd | 1899 | BT31 | 8789 | 64427 | ||
| Zoutpansberg Mines Development Syndicate Ltd | 1902 | BT31 | 9821 | 73177 | ||
| Zoutpansberg Prospecting Co. Ltd | 1889 | BT31 | 4417 | 28734 | ||
| Zubiate Mining Co. Ltd | 1882 | BT31 | 3078 | 17591 | ||
| Zwartkopjes Prospecting Syndicate Ltd | 1910 | BT31 | 13120 | 108023 |
