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Company Name |
Location |
Area |
Year |
Class |
Box No |
Company No |
| N.A. Mining Syndicate Ltd | 1907 | BT31 | 11931 | 92951 | ||
| Naked Man Mining Co. Ltd | 1878 | BT31 | 2432 | 12320 | ||
| Namaqua United Copper Co. Ltd | South Africa | 1887 | BT31 | 4010 | 25525 | |
| Nangiles Tin & Copper Mining Co. Ltd | Kea | Cornwall | 1859 | BT31 | 430 | 1660 |
| Nangiles Tin & Copper Mining Co. Ltd | Nangiles | Cornwall | BT41 | 465 | 2620 | |
| Nannerch Lead Mining Co. Ltd | Nannerch | Flintshire | 1877 | BT31 | 2374 | 11746 |
| Nant Coch Iron Mining Co. Ltd | Wales | 1877 | BT31 | 2368 | 11693 | |
| Nant Minera Mining Co (1862) Ltd | Esclusham Above | Denbighshire | 1862 | BT31 | 615 | 2581 |
| Nant y Blaidd Silver Lead Mine Ltd | Llanrhaeadr-ym-mochnant | Montgomeryshire | 1871 | BT31 | 1600 | 5360 |
| Nant y Car Mining Co. Ltd | Llanarthwl | Breconshire | 1857 | BT31 | 307 | 1069 |
| Nant y Car Mining Co. Ltd | Llanarthwl | Breconshire | BT41 | 465 | 2623 | |
| Nant y Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1870 | BT31 | 1546 | 4949 |
| Nant y Mines Co. Ltd | Llanidloes | Montgomeryshire | 1860 | BT31 | 502 | 1989 |
| Nant y Moch Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1879 | BT31 | 2562 | 13365 |
| Nant y Mwyn Mine Ltd | Prestatyn | Flintshire | 1915 | BT31 | 32211 | 141154 |
| Nant y Mwyn Mining Co. Ltd | Prestatyn | Flintshire | 1860 | BT31 | 516 | 2061 |
| Nant y Ricket Copper & Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1872 | BT31 | 1785 | 6756 |
| Nant y Ronen Consols Silver Lead Mining Co. Ltd | Rheidol Valley | Cardiganshire | 1874 | BT31 | 1969 | 8366 |
| Nantallon Hematite Mines Ltd | Bodmin | Cornwall | 1869 | BT31 | 1452 | 4334 |
| Nanteos & Penrhiw Consolidated Mines Co. Ltd | Ystumtuen | Cardiganshire | BT41 | 465 | 2621 | |
| Nanteos & Penrhiw Consolidated Mines Co. Ltd | Ponterwyd | Cardiganshire | 1857 | BT31 | 233 | 743 |
| Nanteos & Penrhiw United Mining Co. Ltd | Ponterwyd | Cardiganshire | 1860 | BT31 | 510 | 2031 |
| Nanteos Consols Mining Co. Ltd | Ponterwyd | Cardiganshire | 1869 | BT31 | 1484 | 4549 |
| Nanteos Silver Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1863 | BT31 | 861 | 836C |
| Nantiago Mine Ltd | Llangurig | Montgomeryshire | 1916 | BT31 | 23229 | 143511 |
| Nantiago Mining Co. Ltd | Llangurig | Montgomeryshire | 1900 | BT31 | 8840 | 64918 |
| Narracott Manganese Mining Co. Ltd | Milton Abbot | Devon | None State | BT286 | 305 | |
| Narracott Manganese Mining Co. Ltd | Milton Abbot | Devon | 1872 | BT286 | 304 | |
| Nassau Manganese Mines Ltd | 1895 | BT31 | 6173 | 43732 | ||
| Natal Prospecting Co. Ltd | 1887 | BT31 | 3914 | 24751 | ||
| National Minerals Corporation | St Ives | Cornwall | 1907 | BT31 | 18289 | 95891 |
| National Mining & Finance Syndicate Ltd | 1912 | BT31 | 13912 | 122434 | ||
| National Oilfields, Mining & Refining Co. Ltd | 1919 | BT31 | 25403 | 162253 | ||
| National Refractory Minerals Process (Martin’s Patent) Ltd | 1910 | BT31 | 19695 | 112326 | ||
| National Silver Mines Ltd | 1881 | BT31 | 2860 | 15751 | ||
| National Spanish Silver Lead Mines & Mining Co. Ltd | 1911 | BT31 | 20356 | 119121 | ||
| Neath Harbour Smelting & Rolling Works Ltd | 1884 | BT31 | 3371 | 20103 | ||
| Neipin Copper Mining Co. Ltd | 1863-1864 | BT31 | 871 | 874C | ||
| Nellacotta Estates Co. Ltd | 1887-1898 | BT2 | 1637 | |||
| Nenthead & Tynedale Lead & Zinc Co. Ltd | Nenthead | Cumberland | 1882 | BT31 | 14717 | 17356 |
| Nentsbury Mining Co. Ltd | Alston with Garrigill | Cumberland | 1893 | BT31 | 5478 | 37904 |
| Neptune Copper Mining Co. Ltd | Perranuthnoe | Cornwall | 1876 | BT286 | 430 | |
| Nestanza Mines Ltd | 1883 | BT31 | 3234 | 18939 | ||
| Nether Hearth Mining Co. Ltd | Dufton | Westmorland | 1858 | BT31 | 324 | 1135 |
| Nether Hearth Mining Co. Ltd | Dufton | Westmorland | BT41 | 487 | 2701 | |
| Nevada Consolidated Mines & Smelting Co. Ltd | Nevada | U.S.A. | 1884 | BT31 | 3283 | 19359 |
| Nevada Consols Ltd | California | U.S.A. | 1886 | BT31 | 3666 | 22724 |
| Nevada Land & Mining Co. Ltd | Nevada | U.S.A. | 1867 | BT31 | 1348 | 3621 |
| Nevada Silver Mining Co. Ltd | Nevada | U.S.A. | 1866 | BT31 | 1251 | 3004 |
| Nevada Star Mining Co. Ltd | Nevada | U.S.A. | 1913 | BT31 | 21798 | 131886 |
| Nevada Star Mining Co. Ltd | Nevada | U.S.A. | 1914 | BT31 | 22620 | 138584 |
| New Anglo Brazilian Syndicate Ltd | 1904 | BT31 | 17286 | 81827 | ||
| New Appletreewick Mining Co. Ltd | Appletreewick | Yorkshire | 1875 | BT31 | 2105 | 9516 |
| New Aspen Silver Mines Ltd | 1897 | BT31 | 7464 | 53083 | ||
| New Atlanta Silver Mining Co. Ltd | 1871 | BT31 | 1641 | 5661 | ||
| New Balleswidden Ltd | St Just | Cornwall | 1885 | BT31 | 3574 | 21909 |
| New Balleswidden Syndicate Ltd | St Just | Cornwall | 1889 | BT31 | 4632 | 30420 |
| New Balleswidden Tin Mining Co. Ltd | St Just | Cornwall | 1892 | BT31 | 5292 | 36152 |
| New Bampfylde Copper Mining Co. Ltd | North Molton | Devon | 1865 | BT286 | 81 | |
| New Beldon Lead Mining Co. Ltd | Newbiggin | Northumberland | 1868 | BT31 | 1408 | 4034 |
| New Belgium (Transvaal) Lands & Development Co. Ltd | South Africa | 1889 | BT31 | 15009 | 29583 | |
| New Bensberg Mining Co. Ltd | 1876 | BT31 | 2282 | 10977 | ||
| New Bronfloyd Co. Ltd | Penrhyncoch | Cardiganshire | 1877 | BT31 | 2344 | 11456 |
| New Brunswick Mining Co | 1856 | BT31 | 21 | 103 | ||
| New Brunswick Mining Co | BT41 | 489 | 2707 | |||
| New Burra Burra Mining Co of Australia | South Australia | 1862 | BT31 | 663 | 2806 | |
| New Caledonia Mines Co. Ltd | 1882-1890 | BT2 | 1100 | |||
| New Callao Ltd | Venezuela | 1881 | BT31 | 2796 | 15291 | |
| New Cambrian Mining & Smelting Co. Ltd | Ponterwyd | Cardiganshire | 1881 | BT31 | 2891 | 16032 |
| New Carleen Vor & West Metal Mining Co. Ltd | Breage | Cornwall | 1876 | BT286 | 416 | |
| New Castell Blende Mine Ltd | Ponterwyd | Cardiganshire | 1912 | BT31 | 20681 | 122144 |
| New Castell Mines Ltd | Ponterwyd | Cardiganshire | 1897 | BT31 | 7636 | 54512 |
| New Cathedral Copper & Tin Mining Co. Ltd | Gwennap | Cornwall | 1878 | BT286 | 459 | |
| New Central Snailbeach Mining Co. Ltd | Snailbeach | Shropshire | 1869 | BT31 | 1497 | 4640 |
| New Chance Mining Co. Ltd | 1880 | BT31 | 2634 | 13974 | ||
| New Chiverton Mining Co. Ltd | Perranzabuloe | Cornwall | 1875 | BT286 | 409 | |
| New Clifford Mining Co. Ltd | Gwennap | Cornwall | 1865 | BT286 | 83 | |
| New Clive Mining Co. Ltd | Grinshill | Shropshire | 1865 | BT31 | 1089 | 2057C |
| New Combmartin Silver Lead Mining Co. Ltd | Combe Martin | Devon | 1864 | BT286 | 53 | |
| New Concord Silver Lead & Copper Mining Co. Ltd | Sydenham Damerel | Devon | 1863 | BT286 | 13 | |
| New Coniston Copper Mining Ltd | Coniston | Lancashire | 1869 | BT31 | 1456 | 4361 |
| New Consolidated Mining Co. Ltd | Stoke Climsland | Cornwall | 1886 | BT31 | 3715 | 23110 |
| New Cornish Lead & Copper Mining Co. Ltd | Calstock | Cornwall | 1860 | BT31 | 518 | 2071 |
| New Crickheath Lead & Copper Mining Co. Ltd | Oswestry | Shropshire | 1875 | BT31 | 2104 | 9514 |
| New Crowndale Mining Co. Ltd | Tavistock | Devon | 1874 | BT286 | 360 | |
| New Crystal Mining Co. Ltd | 1908 | BT31 | 12433 | 98583 | ||
| New Cwm Elan Lead Mining Co. Ltd | Rhayader | Radnorshire | 1875 | BT31 | 2094 | 9419 |
| New Cyferfontein Prospecting & Developing Syndicate Ltd | 1896 | BT31 | 15666 | 49335 | ||
| New Dale Mine Ltd | Leek | Staffordshire | 1868 | BT31 | 1400 | 3978 |
| New Devon Consols Copper Mining Co | Lamerton | Devon | 1864 | BT286 | 45 | |
| New Disraeli Mine Co. Ltd | 1889 | BT31 | 4515 | 29503 | ||
| New Dolcoath Tin & Copper Mining Co. Ltd | Camborne | Cornwall | 1872 | BT286 | 269 | |
| New Drws y Coed Copper & Silver Lead Mines Ltd | Nantlle | Caernarvonshire | 1888 | BT31 | 4115 | 26456 |
| New Ecton Mining Co. Ltd | Alton | Staffordshire | 1861 | BT31 | 601 | 2515 |
| New Emma Silver Mining Co. 1886 Ltd | U.S.A. | 1886 | BT31 | 3648 | 22546 | |
| New Emma Silver Mining Co. Ltd | U.S.A. | 1882 | BT31 | 2922 | 16300 | |
| New Erwfelni Lead Mining Co. Ltd | Mold | Flintshire | 1867 | BT31 | 1374 | 3797 |
| New Flagstaff Consolidated Silver Mining Co. Ltd | Utah | U.S.A. | 1880 | BT31 | 2649 | 14082 |
| New Flintshire Lead Mining Co. Ltd | Mold | Flintshire | 1875 | BT31 | 2133 | 9790 |
| New Florence Mining Co. Ltd | North Molton | Devon | 1880 | BT31 | 2598 | 13677 |
| New Fowey Consols Tin & Copper Mining Co. Ltd | Tywardreath | Cornwall | 1874 | BT286 | 385 | |
| New Foxdale & Ballakew Silver Lead Mining Co. Ltd | Foxdale | Isle of Man | 1874 | BT31 | 1977 | 8434 |
| New Glasdir Mining Co. Ltd | Dolgellau | Merionethshire | 1876 | BT31 | 2186 | 10229 |
| New Gordon Diamond Co. Ltd | 1891 | BT31 | 5009 | 33558 | ||
| New Granada Co. | Colombia | 1856 | BT31 | 128 | 409 | |
| New Granada Co. Ltd | Colombia | 1859 | BT31 | 416 | 1600 | |
| New Grassington Lead Mining Co. Ltd | Conistone with Kilnsey | Yorkshire | 1870 | BT31 | 1567 | 5112 |
| New Great Consols Mining Co. Ltd | Stoke Climsland | Cornwall | 1867 | BT286 | 145 | |
| New Great Wheal Fortune & Polcrebo Mines Ltd | Crowan | Cornwall | 1881 | BT31 | 2857 | 15735 |
| New Great Wheal Fortune Syndicate Ltd | Breage | Cornwall | 1908 | BT31 | 12319 | 97191 |
| New Great Wheal Vor Tin Mining Co. Ltd | Breage | Cornwall | 1881 | BT286 | 538 | |
| New Great Wheal Vor Tin Mining Co. Ltd | Breage | Cornwall | 1889 | BT286 | 140 | |
| New Great Work Ltd | Germoe | Cornwall | 1883 | BT31 | 3104 | 17790 |
| New Great Work Tin Mine Ltd | Breage | Cornwall | 1890 | BT31 | 4799 | 31776 |
| New Guadalcazar Quicksilver Mines Ltd | 1895 | BT31 | 6353 | 44875 | ||
| New Hafod Lead Mining Co. Ltd | Gwernaffield | Flintshire | 1883 | BT31 | 3097 | 17746 |
| New Halkyn Lead Mine Ltd | Halkyn | Flintshire | 1899 | BT31 | 8663 | 63187 |
| New Hillgrove Proprietary Mines Ltd | 1902 | BT31 | 9944 | 74164 | ||
| New Hingston Tin Mining Co. Ltd | Callington | Cornwall | 1871 | BT286 | 240 | |
| New Hobbs Hill Mining Co. Ltd | 1874 | BT286 | 363 | |||
| New Holmbush Mining Co. Ltd | Stoke Climsland | Cornwall | 1880 | BT31 | 2632 | 13956 |
| New Holtzappel Copper Silver Lead & Zinc Mining Co. Ltd | BT41 | 490 | 2716 | |||
| New Holtzappel Copper Silver Lead & Zinc Mining Co. Ltd | 1857 | BT31 | 252 | 835 | ||
| New Hornachos Silver Mines Ltd | Spain | 1889 | BT31 | 4371 | 28394 | |
| New House Mining Co. Ltd | MN | 1863 | BT31 | 833 | 701C | |
| New Imuris Mines Ltd | 1892 | BT31 | 5314 | 36353 | ||
| New Independence Mine Ltd | 1898 | BT31 | 8240 | 59782 | ||
| New Injebreck Silver Lead Mining Co. Ltd | Isle of Man | 1872 | BT31 | 1753 | 6530 | |
| New Inkerman Mines Ltd | 1898 | BT31 | 7961 | 57165 | ||
| New Killifreth Tin Mine Ltd | Chacewater | Cornwall | 1927 | BT31 | 32832 | 221806 |
| New Komer Kocha Silver Mines Ltd | 1899 | BT31 | 8342 | 60638 | ||
| New La Plata Mining & Smelting Co. Ltd | 1886 | BT31 | 3711 | 23078 | ||
| New La Velera Ltd | 1891 | BT31 | 5144 | 34728 | ||
| New Leeswood Spelter Co. Ltd | Flintshire | 1893 | BT31 | 5727 | 40065 | |
| New Leh Chin Mine Ltd | 1907 | BT31 | 18279 | 95746 | ||
| New Leopold Iron Mining Co. Ltd | 1882 | BT31 | 3012 | 17007 | ||
| New Linares Mining & Smelting Co | Linares | Spain | 1853 | BT41 | 491 | 2718 |
| New Llanfair Mining Co. Ltd | Genoil Gais | Carmarthenshire | 1880 | BT31 | 2643 | 14028 |
| New Llangynog Lead Mining Co. Ltd | Llanrhaeadr | Montgomeryshire | 1870 | BT31 | 1551 | 4979 |
| New Llynclys Lead Copper & Oxide Syndicate Mining Co. Ltd | Llynclys | Shropshire | 1881 | BT31 | 2843 | 15637 |
| New Mansfield Copper & Silver Mining Co. Ltd | Brunswick | Germany | 1863 | BT31 | 796 | 509C |
| New Maranham Mining Co. Ltd | 1866 | BT31 | 1272 | 3144 | ||
| New Mellanear Mining Co. Ltd | St Erth | Cornwall | 1874 | BT286 | 357 | |
| New Merrybent & Middleton Tyas Mining & Smelting Co. Ltd | Melsonby | Yorkshire | 1866 | BT31 | 1297 | 3306 |
| New Metcalfe & General Mining Co. of Jamaica | BT41 | 491 | 2721 | |||
| New Midland Mining Co | Ashover | Derbyshire | 1858 | BT41 | 491 | 2722 |
| New Midland Mining Co. Ltd | Ashover | Derbyshire | 1858 | BT31 | 325 | 1143 |
| New Minera Mining Co. Ltd | Minera | Denbighshire | 1887 | BT31 | 4014 | 25552 |
| New Mount Albion Silver Mining & Smelting Co. Ltd | 1891 | BT31 | 5203 | 35235 | ||
| New Mount Shamrock Mine Ltd | 1898 | BT31 | 7903 | 56639 | ||
| New Nant y Blaidd Silver Lead Mine Ltd | Llanrhaeadr-ym-mochnant | Montgomeryshire | 1873 | BT31 | 1801 | 6882 |
| New Nautymwyn Mining Extension Co. Ltd | Carmarthenshire | 1867 | BT31 | 1325 | 3458 | |
| New North Halkyn Mines Ltd | Halkyn | Flintshire | 1904 | BT31 | 35999 | 81891 |
| New North Pool Mining Co. Ltd | Redruth | Cornwall | 1876 | BT286 | 415 | |
| New North Tamar Silver Lead Mining Co. Ltd | Bere Ferrers | Devon | 1875 | BT286 | 394 | |
| New North Van Mining Co. Ltd | Llanidloes | Montgomeryshire | 1871 | BT31 | 1646 | 5698 |
| New North Wales United Mines Ltd | Wales | 1895 | BT31 | 6259 | 44332 | |
| New Pacific Mining Co. Ltd | 1873 | BT31 | 1896 | 7644 | ||
| New Pandora Mining Syndicate Ltd | Trefriw | Caernarvonshire | 1908 | BT31 | 12591 | 100570 |
| New Parkside Mining Co. Ltd | Egremont | Cumberland | 1875 | BT31 | 14533 | 9539 |
| New Penrose Tin & Copper Mine Co. Ltd | Sithney | Cornwall | 1880 | BT286 | 498 | |
| New Penrose Tin & Copper Mine Co. Ltd | Sithney | Cornwall | 1890 | BT286 | 146 | |
| New Pentre Hackym Co. Ltd | Pentre Halkyn | Flintshire | 1900 | BT31 | 9090 | 67301 |
| New Phoenix Mine Ltd | Altarnun | Cornwall | 1891 | BT286 | 601 | |
| New Polmear Mining Syndicate Ltd | St Austell | Cornwall | 1906 | BT31 | 11749 | 91096 |
| New Purisima Smelting & Mining Co. Ltd | 1893 | BT31 | 15291 | 38194 | ||
| New Redmoor Mining Co. Ltd | Stoke Climsland | Cornwall | 1881 | BT31 | 2789 | 15237 |
| New Restormel Iron Mine Ltd | Lostwithiel | Cornwall | 1912 | BT31 | 13793 | 119541 |
| New Roartey’s Luck Mines Ltd | 1906 | BT31 | 11536 | 88945 | ||
| New Roman Gravels Boundary Mining Co. Ltd | Minsterley | Shropshire | 1884 | BT31 | 3322 | 19699 |
| New Rosario Silver Mining Co. Ltd | Mexico | 1870 | BT31 | 1531 | 4845 | |
| New San Acasio Mine & Freehold Land Co. Ltd | 1888 | BT31 | 4059 | 25942 | ||
| New Silver Rake Mining Co. Ltd | Halkyn | Flintshire | 1873 | BT31 | 1870 | 7405 |
| New South Merllyn Mining Co. Ltd | Whitford | Flintshire | 1874 | BT31 | 1938 | 8082 |
| New South Roman Gravels Mining Co. Ltd | Shelve | Shropshire | 1887 | BT31 | 3934 | 24919 |
| New South Wales Quicksilver Mining Co. Ltd | 1873 | BT31 | 1900 | 7677 | ||
| New St Agnus Mine Co. Ltd | St Agnes | Cornwall | 1876 | BT286 | 433 | |
| New St Blazey Tin Mines Ltd | St Blazey | Cornwall | 1874 | BT286 | 373 | |
| New St Patrick Lead Mine Ltd | Halkyn | Flintshire | 1880 | BT31 | 2677 | 14318 |
| New Tamar Silver Lead Mine Ltd | Bere Ferrers | Devon | 1885 | BT286 | 560 | |
| New Tamar Silver Lead Mine Ltd | Bere Alston | Devon | 1885 | BT286 | 36 | |
| New Teign Valley Mining Co. Ltd | Bridford | Devon | 1901 | BT31 | 9340 | 69388 |
| New Terras Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | 1882 | BT286 | 547 | |
| New Terras Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | 1882 | BT286 | 10 | |
| New Terras Tin Mining Co. Ltd | St Stephen in Brannel | Cornwall | 1882 | BT286 | 546 | |
| New Tharsis Sulphur Co. Ltd | Spain | 1873 | BT31 | 1922 | 7921 | |
| New Tincroft United Mining Co. Ltd | Illogan | Cornwall | 1876 | BT286 | 437 | |
| New Tindene Ltd | Breage | Cornwall | 1892 | BT31 | 5468 | 37838 |
| New Trelawny Silver Lead Mining Co. Ltd | St Ive | Cornwall | 1866 | BT286 | 119 | |
| New Treveddoe Tin Mining Co. Ltd | Cardinham | Cornwall | 1871 | BT286 | 243 | |
| New Trumpet Consols Mining Co. Ltd | Wendron | Cornwall | 1888 | BT286 | 80 | |
| New Trumpet Consols Mining Co. Ltd | Wendron | Cornwall | 1881 | BT286 | 545 | |
| New Tyllwyd Silver Lead Mining Co. Ltd | Aberffrwd | Cardiganshire | 1876 | BT31 | 2262 | 10815 |
| New Van Consols & Glyn Mining Co. Ltd | Llanidloes | Montgomeryshire | 1882 | BT31 | 3068 | 17490 |
| New Van Mining Co. Ltd | Llanidloes Without | Montgomeryshire | 1872 | BT31 | 1691 | 6052 |
| New Velvet Portland Mine Ltd | 1905 | BT31 | 17604 | 86528 | ||
| New Ventanas Mining & Exploration Co. Ltd | 1911 | BT31 | 20115 | 116697 | ||
| New Victoria (South Devon) Mining Co. Ltd | Ashburton | Devon | 1869 | BT286 | 180 | |
| New Vitifer Consols Mining Co. Ltd | Chagford | Devon | 1870 | BT286 | 205 | |
| New Vitifer Mining Co. Ltd | Chagford | Devon | 1873 | BT286 | 350 | |
| New Vor & Wheal Wallis Tin Mining Co. Ltd | Breage | Cornwall | 1888 | BT286 | 585 | |
| New Vor & Wheal Wallis Tin Mining Co. Ltd | Breage | Cornwall | 1888 | BT286 | 104 | |
| New Waitekauri Extended Mines Ltd | 1901 | BT31 | 9330 | 69333 | ||
| New Wassau Prospecting Syndicate Ltd | 1903 | BT31 | 10204 | 76530 | ||
| New West Chiverton Syndicate Ltd | Perranzabuloe | Cornwall | 1924 | BT31 | 28326 | 195419 |
| New West Dolcoath Copper Mining Co. Ltd | Camborne | Cornwall | 1862 | BT31 | 624 | 2615 |
| New West Goginan Silver Lead Mining Syndicate Ltd | Goginan | Cardiganshire | 1881 | BT31 | 2805 | 15371 |
| New West of England Manganese Mining Co. Ltd | Devon | 1883 | BT31 | 3106 | 17809 | |
| New Westminster Mine Ltd | Llanarmon | Denbighshire | 1890 | BT31 | 4827 | 32013 |
| New Westminster Mining Co. Ltd | Llanarmon | Denbighshire | 1868 | BT31 | 1402 | 3999 |
| New Wheal Buller Ltd | Redruth | Cornwall | 1881 | BT286 | 2 | |
| New Wheal Buller Ltd | Redruth | Cornwall | 1881 | BT286 | 541 | |
| New Wheal Charlotte Mining Co. Ltd | St Agnes | Cornwall | 1870 | BT286 | 216 | |
| New Wheal Emma Copper Mine Ltd | Helston | Cornwall | 1877 | BT286 | 445 | |
| New Wheal Fortune Co. Ltd | Sithney | Cornwall | 1880 | BT286 | 507 | |
| New Wheal Leisure Mining Co. Ltd | Perranzabuloe | Cornwall | 1886 | BT286 | 58 | |
| New Wheal Leisure Mining Co. Ltd | Perranzabuloe | Cornwall | 1886 | BT286 | 573 | |
| New Wheal Martha Mining Co. Ltd | Stoke Climsland | Cornwall | 1863 | BT31 | 730 | 180C |
| New Wheal Speedwell Copper Tin & Lead Mining Co. Ltd | St Hilary | Cornwall | 1870 | BT286 | 197 | |
| New Wheal Vor & East Wheal Metal Mining Co. Ltd * | Sithney | Cornwall | 1861 | BT31 | 592 | 2468 |
| New White Works Tin Mining Co. Ltd | Lydford | Devon | 1874 | BT286 | 370 | |
| New Wildberg Mining Co. Ltd | 1863 | BT31 | 833 | 699C | ||
| New Wye Valley Lead Mining Co. Ltd | Llangurig | Montgomeryshire | 1880 | BT31 | 2612 | 13802 |
| New Yelta Copper Mining & Smelting Co. Ltd | 1898 | BT31 | 8211 | 59476 | ||
| New Zealand Antimony Co. Ltd | New Zealand | 1887 | BT31 | 3933 | 24909 | |
| New Zealand Crown Mines Co. Ltd | New Zealand | 1891-1900 | BT2 | 2164 | ||
| New Zealand Crown Mines Co. Ltd | New Zealand | 1895-1900 | BT2 | 2827 | ||
| New Zealand Crown Mines Co. Ltd | New Zealand | 1888-1893 | BT2 | 1774 | ||
| New Zealand Crown Mines Co. Ltd | New Zealand | 1896 | BT31 | 6903 | 48546 | |
| New Zealand Manganese Mines Ltd | New Zealand | 1874 | BT31 | 2059 | 9067 | |
| New Zealand Mines Trust Ltd | New Zealand | 1895 | BT31 | 6201 | 43955 | |
| Newborough Silver Lead Mine Co. Ltd | Wales | 1873 | BT31 | 1818 | 7028 | |
| Newbrough Mining Co. Ltd | Fourstones | Durham | 1893 | BT31 | 5640 | 39320 |
| Newbrynpostig Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1869 | BT31 | 1464 | 4425 |
| Newchatel Bitummous Rock Co. Ltd | 1871 | BT31 | 1598 | 5343 | ||
| Newfoundland Minerals Co. Ltd | Newfoundland | Canada | 1879 | BT31 | 2572 | 13466 |
| Newfoundland Mining Association Ltd | Newfoundland | Canada | BT41 | 501 | 2754 | |
| Newfoundland Mining Co. Ltd | Newfoundland | Canada | 1872 | BT31 | 1737 | 6407 |
| Newlands Vale Silver Lead Mining Co. Ltd | Keswick | Cumberland | 1884 | BT31 | 3349 | 19947 |
| Newquay Mining Co. Ltd | Newquay | Cornwall | 1881 | BT286 | 540 | |
| Newry Granite Co. Ltd | Ireland | 1917 | BT31 | 23605 | 146562 | |
| Newry Quarries Ltd | Ireland | 1898 | BT31 | 8055 | 58027 | |
| Newton Mining Co. Ltd | MN | BT41 | 503 | 2764 | ||
| Newton Mining Co. Ltd | MN | 1859 | BT31 | 416 | 1603 | |
| Newton Silver Mining Co. Ltd | Calstock | Cornwall | 1879 | BT286 | 471 | |
| Niagara (Mexico) Silver Mine Ltd | 1912 | BT31 | 20485 | 120397 | ||
| Nidderdale Lead Mining Co | Bewerley | Yorkshire | 1858 | BT41 | 504 | 2768 |
| Nidderdale Lead Mining Co. Ltd | Bewerley | Yorkshire | 1859 | BT31 | 419 | 1618 |
| Nigerian Smelting Corporation Ltd | 1910 | BT31 | 19638 | 111585 | ||
| Nils Pearson Mining Syndicate Ltd | 1911 | BT31 | 13648 | 116600 | ||
| Nils Pearson Mining Syndicate Ltd | 1911 | BT31 | 13648 | 116600 | ||
| Nine Mines of Novita Ltd | 1894 | BT31 | 5835 | 40951 | ||
| Nirvana Silver and Lead Mines Ltd | 1912 | BT31 | 20533 | 120803 | ||
| Noble Dale Mining Co. Ltd | Cornwall | 1865 | BT286 | 101 | ||
| Nordlands Mines Ltd | 1905 | BT31 | 11226 | 85731 | ||
| Norse Power & Smelting Syndicate Ltd | 1910 | BT31 | 13340 | 111094 | ||
| North & South Llangynog Silver Lead Mines Co. Ltd | Llanrhaeadr | Montgomeryshire | 1883 | BT31 | 3232 | 18920 |
| North African Prospecting Syndicate Ltd | 1913 | BT31 | 21678 | 130822 | ||
| North Alfred Consols Copper Mining Co. Ltd | Phillack | Cornwall | 1880 | BT286 | 514 | |
| North Alltycrib Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1870 | BT31 | 1571 | 5138 |
| North American Mining & Finance Syndicate Ltd | 1915 | BT31 | 22929 | 141134 | ||
| North Aspen Mines Syndicate Ltd | 1893 | BT31 | 5511 | 38208 | ||
| North Australian Mining Co. Ltd | Northern Territory | Australia | 1888 | BT31 | 4033 | 25712 |
| North Borneo Prospecting & Cultivation Syndicate Ltd | Borneo | 1895 | BT31 | 6472 | 45595 | |
| North Boscaswell Mine Ltd | St Just | Cornwall | 1906 | BT31 | 17776 | 88990 |
| North Cambrian Mining Co. Ltd | Wales | 1859 | BT31 | 399 | 1514 | |
| North Cambrian Mining Co. Ltd | Wales | BT41 | 507 | 2784 | ||
| North Cardiganshire Silver Lead Mining Co. Ltd | Tal-y-bont | Cardiganshire | 1881 | BT31 | 2800 | 15333 |
| North Carrock Mining Co. Ltd | Caldbeck | Cumberland | 1860 | BT31 | 519 | 2072 |
| North Cerro Muriano Copper Mines Ltd | Cordoba | Spain | 1906 | BT31 | 11434 | 87892 |
| North Coniston Copper Mining Co | Coniston | Lancashire | 1863 | BT31 | 855 | 810C |
| North Cornwall Lead Mining Co. Ltd | Callington | Cornwall | 1876 | BT286 | 420 | |
| North Dartmoor Tin Mining Co. Ltd | Lydford | Devon | 1872 | BT286 | 314 | |
| North D’Eresby Mountain Lead Mining Co. Ltd | Llanrwst | Caernarvonshire | 1878 | BT31 | 2464 | 12599 |
| North Devon Mining Co. Ltd | Devon | 1884 | BT31 | 3424 | 20601 | |
| North Devon Silver Lead Mining Co. Ltd | Combe Martin | Devon | 1859 | BT31 | 444 | 1713 |
| North Devon Silver Lead Mining Co. Ltd | Combe Martin | Devon | 1859 | BT41 | 508 | 2788 |
| North Eastern Electric Smelting Co. Ltd | 1911 | BT31 | 20325 | 118843 | ||
| North Eastern Stevens Mining Co. Ltd | 1878 | BT31 | 2429 | 12294 | ||
| North Great Work Tin Mining Co. Ltd | Breage | Cornwall | 1862 | BT31 | 635 | 2666 |
| North Green Hurth Lead Mining Co. Ltd | Garrigill | Cumberland | 1880 | BT31 | 2716 | 14656 |
| North Grogwinion Silver Lead Mine Ltd | Pontrhydygroes | Cardiganshire | 1881 | BT31 | 2867 | 15817 |
| North Grylls Tin Mining | St Hilary | Cornwall | 1862 | BT31 | 630 | 2638 |
| North Hafod Silver Lead Mining Co. Ltd | Pontrhydgroes | Cardiganshire | 1861 | BT31 | 577 | 2387 |
| North Hallenbeagle Tin & Copper Mining Co. Ltd | St Agnes | Cornwall | 1860 | BT41 | 510 | 2796 |
| North Hallenbeagle Tin & Copper Mining Co. Ltd | St Agnes | Cornwall | 1860 | BT31 | 475 | 1853 |
| North Henblas Mining Co. Ltd | Holywell | Flintshire | 1867 | BT31 | 1348 | 3617 |
| North Hendre Lead Mining Co. Ltd | Mold | Flintshire | 1866 | BT31 | 1215 | 2779C |
| North Island (N.Z.) Prospecting Syndicate Ltd | 1897 | BT31 | 7370 | 52249 | ||
| North Island Mining Syndicate Ltd | 1921 | BT31 | 26787 | 176921 | ||
| North Jane Tin Silver & Lead Mining Co | Baldhu | Cornwall | 1860 | BT41 | 511 | 2799 |
| North Jane Tin Silver & Lead Mining Co. Ltd | Kenwyn | Cornwall | 1860 | BT31 | 480 | 1878 |
| North Laxey Mining Co. Ltd | Maughold | Isle of Man | 1873 | BT31 | 1886 | 7539 |
| North Laxey Mining Co. Ltd | Maughold | Isle of Man | 1859 | BT31 | 439 | 1699 |
| North Laxey Mining Co. Ltd | Maughold | Isle of Man | BT41 | 511 | 2802 | |
| North Levant & Geevor Ltd | Pendeen | Cornwall | 1906 | BT31 | 11584 | 89436 |
| North Maldon Mine Ltd | 1899 | BT31 | 8698 | 63502 | ||
| North Metal & Harriet Mining Co. Ltd | Breage | Cornwall | 1873 | BT286 | 322 | |
| North Mexican Silver Mining Co. Ltd | Mexico | 1884 | BT31 | 3295 | 19452 | |
| North Minera Lead Mining Co. Ltd | Minera | Denbighshire | 1858 | BT31 | 354 | 1292 |
| North Minera Lead Mining Co. Ltd | Minera | Denbighshire | 1860 | BT31 | 491 | 1938 |
| North Minera Lead Mining Co. Ltd | Minera | Denbighshire | BT41 | 512 | 2807 | |
| North Molton Mining Co. Ltd | North Molton | Devon | 1878 | BT286 | 457 | |
| North Nant y Mwyn Lead Mining Co. Ltd | Wales | 1861 | BT31 | 532 | 2137 | |
| North of Europe Land & Mining Co. Ltd | 1865 | BT31 | 1130 | 2297C | ||
| North of Ireland Iron Ore Co. Ltd | Ireland | 1872 | BT31 | 1722 | 6290 | |
| North of Ireland Mineral Company Ltd | Ireland | 1896 | BT31 | 7083 | 49909 | |
| North of Ireland Mineral Company Ltd | Ireland | 1896 | BT31 | 7083 | 49909 | |
| North of Ireland Minerals Co. Ltd | Ireland | 1917 | BT31 | 23900 | 149087 | |
| North of Ireland Mining & Pier or Harbour Co | Ireland | 1852 | BT41 | 511 | 2798 | |
| North Par Copper & Tin Mining Co. Ltd | St Blazey | Cornwall | 1861 | BT31 | 569 | 2335 |
| North Parys Mining Co. Ltd | Amlwch | Wales | 1864 | BT31 | 979 | 1432C |
| North Patrick Lead Mining Co. Ltd | Halkyn | Flintshire | 1877 | BT31 | 2335 | 11392 |
| North Phoenix Syndicate Ltd | Linkinhorne | Cornwall | 1908 | BT31 | 99571 | 99571 |
| North Pool Mining Co. Ltd | Redruth | Cornwall | 1881 | BT31 | 2895 | 16068 |
| North Pool Mining Co. Ltd | Redruth | Cornwall | 1871 | BT286 | 225 | |
| North Prince Patrick Lead Mining Co. Ltd | Yscelflog | Flintshire | 1874 | BT31 | 2011 | 8682 |
| North Rhine Copper Mining Co of South Australia Ltd | South Australia | Australia | 1858 | BT31 | 355 | 1294 |
| North Rhine Copper Mining Co. of South Australia Ltd | BT41 | 512 | 2808 | |||
| North Roman Gravels Lead Mining Co. Ltd | Worthen | Shropshire | 1875 | BT31 | 2158 | 10026 |
| North Roman Gravels Ltd | Shelve | Shropshire | 1887 | BT31 | 3880 | 24488 |
| North Rose Ltd | Newlyn East | Cornwall | 1884 | BT31 | 3343 | 19892 |
| North Shepherds Ltd | Newlyn East | Cornwall | 1884 | BT31 | 3344 | 19893 |
| North Snailbeach Lead & Barytes Mining Syndicate Ltd | Middleton | Shropshire | 1880 | BT31 | 2679 | 14338 |
| North Spanish Silver Mines Ltd | 1889 | BT31 | 4374 | 28415 | ||
| North Staffordshire Mining Industry Offices Ltd | Staffordshire | 1937 | BT31 | 35718 | 332030 | |
| North Tamar Lead & Silver Mining Co. Ltd | Bere Ferrers | Devon | 1864 | BT286 | 69 | |
| North Tankerville Mining Co. Ltd | Shelve | Shropshire | 1870 | BT31 | 1551 | 4981 |
| North Tolima Silver Mines Ltd | Colombia | 1884 | BT31 | 3314 | 19617 | |
| North Tolima Silver Mines Ltd | 1891 | BT31 | 5119 | 34513 | ||
| North Treburgett Silver Lead Mining Co. Ltd | St Teath | Cornwall | 1871 | BT286 | 209 | |
| North Treleigh Wood Mining Co. Ltd | Redruth | Cornwall | 1872 | BT286 | 281 | |
| North Treskerby Tin & Copper Mines Ltd | North Downs | Cornwall | 1884 | BT286 | 24 | |
| North Treskerby Tin & Copper Mines Ltd | St Agnes | Cornwall | 1884 | BT286 | 554 | |
| North Van Mines Ltd | Llanidloes | Montgomeryshire | 1874 | BT31 | 1964 | 8319 |
| North Van Mining Co. Ltd | Trefeglwys | Montgomeryshire | 1871 | BT31 | 1646 | 5698 |
| North Vigra Mining Co. Ltd | Llanaber | Merionethshire | 1862 | BT31 | 614 | 2577 |
| North Wales Copper & Mining Syndicate Ltd | Wales | 1920 | BT31 | 25714 | 165384 | |
| North Wales Freehold Copper Mines & Smelting Co. Ltd | Conwy | Caernarvonshire | 1881 | BT31 | 14684 | 15705 |
| North Wales Lead Co. Ltd | Montgomeryshire | 1907 | BT31 | 12012 | 93780 | |
| North Wales Mining Proprietary Ltd | Wales | 1895 | BT31 | 6179 | 43766 | |
| North Wales Sulphur Mining Co. Ltd | Wales | 1889 | BT31 | 4584 | 30026 | |
| North Wales United Mines Ltd | Caernarvonshire | 1890 | BT31 | 4746 | 31357 | |
| North West Bultfontein Diamond Mining Co. Ltd | 1881 | BT31 | 2834 | 15571 | ||
| North Westmorland Lead Mining Co. Ltd | Brough | Westmorland | 1883 | BT31 | 3213 | 18737 |
| North Wheal Grylls Tin Mining Co. Ltd | Cornwall | 1886 | BT31 | 3771 | 23532 | |
| North Wheal Metal Mining Co. Ltd | Sithney | Cornwall | 1872 | BT286 | 279 | |
| North Wheal Providence Tin & Copper Mining Co. Ltd | St Ives | Cornwall | 1862 | BT31 | 606 | 2539 |
| North Wheal Seton Copper Mining Co. Ltd | Camborne | Cornwall | 1863 | BT286 | 21 | |
| North Wheal Vor Mining Co. Ltd | Breage | Cornwall | 1880 | BT286 | 499 | |
| North Wicklow Copper & General Mining Co. Ltd | Ireland | 1863 | BT31 | 760 | 335C | |
| North Wicklow Copper & General Mining Co. Ltd | Castlemacadam | Ireland | 1863 | BT31 | 760 | 335C |
| North Wrey Mining Co. Ltd | St Ive | Cornwall | 1860 | BT31 | 509 | 2024 |
| North Wynaad and Manantoddy Syndicate Ltd | India | 1890 | BT31 | 15064 | 31117 | |
| North Zeehan Silver Lead Mines Ltd | 1891 | BT31 | 5145 | 34736 | ||
| Northern & Eastern Mining Co. Ltd | 1919 | BT31 | 32288 | 155678 | ||
| Northern Lead Mining Co. Ltd | Rookhope | Durham | 1879 | BT31 | 2578 | 13509 |
| Northern Metals Mining Corporation Ltd | 1911 | BT31 | 13652 | 116673 | ||
| Northern Mineral Co. Ltd | MN | 1883 | BT31 | 3220 | 18802 | |
| Northern Nigeria Mining & Exploration Co. Ltd | Nigeria | 1910 | BT31 | 19366 | 108671 | |
| Northern Nigerian Lead Mines Ltd | Nigeria | 1931 | BT31 | 33263 | 256530 | |
| Northern Ochre & Mining Co. Ltd | Cornwall | 1905 | BT31 | 11220 | 85682 | |
| Northern Ontario Prospecting Syndicate Ltd | 1911 | BT31 | 32092 | 114887 | ||
| Northern Silver Lead & Blende Mining Co. Ltd | Isle of Man | 1870 | BT31 | 1551 | 4980 | |
| Northern Territories Minerals Prospecting & Development Corporation of South Australia Ltd | 1900 | BT31 | 8862 | 65176 | ||
| Northern Territories Mines of Australia Ltd | 1905 | BT31 | 10971 | 83354 | ||
| Northern Territories Mining & Smelting Co. Ltd | 1902 | BT31 | 10120 | 75809 | ||
| Northern Titanic Iron Ore & Smelting Co. Ltd | 1872 | BT31 | 1716 | 6234 | ||
| Northern Union Mining Co. Ltd | 1913 | BT31 | 21598 | 130099 | ||
| Northfield Iron & Steel Co. Ltd | 1861 | BT31 | 556 | 2263 | ||
| Northumberland Mining Syndicate Ltd | Northumberland | 1891 | BT31 | 5029 | 33735 | |
| Norway Copper Mines Co. Ltd | Norway | 1881 | BT31 | 2784 | 15207 | |
| Norway Mining Corporation Ltd | Norway | 1889 | BT31 | 4552 | 29822 | |
| Norway Mining Timber Co. Ltd | Norway | 1872 | BT31 | 1734 | 6386 | |
| Norwegian & Anglo-German Mining Syndicate Ltd | Norway | 1907 | BT31 | 12231 | 96160 | |
| Norwegian Copper & General Mining Co. Ltd | Norway | 1912 | BT31 | 20563 | 121097 | |
| Norwegian Copper Co. Ltd | Norway | 1864 | BT31 | 901 | 1019C | |
| Norwegian Copper Mines Ltd | Norway | 1898 | BT31 | 8124 | 58663 | |
| Norwegian Electric Smelting Co. Ltd | Norway | 1919 | BT31 | 32308 | 158135 | |
| Norwegian Mining & Smelting Association Ltd | Norway | 1874 | BT31 | 2048 | 8956 | |
| Norwegian Mining Syndicate Ltd | Norway | 1910 | BT31 | 13125 | 108079 | |
| Norwegian Zinc Mining Concessions Ltd | Norway | 1912 | BT31 | 20922 | 124245 | |
| Nova Scotia Mining & Smelting Co | Nova Scotia | Canada | 1853 | BT41 | 521 | 2859 |
| Novita Mining Syndicate Ltd | 1912 | BT31 | 32122 | 120975 | ||
| Nubia (Sudan) Prospecting Syndicate Ltd | 1903 | BT31 | 10184 | 76372 | ||
| Nysoeter Zinc Mines Ltd | 1892 | BT31 | 5245 | 35672 | ||
| O.K. Briggs & Co. Ltd | 1921 | BT31 | 26467 | 173300 | ||
| Oakamoor & Stanton Mining Co. Ltd | Colton | Staffordshire | 1859 | BT41 | 522 | 2862 |
| Oakamoor & Stanton Mining Co. Ltd | Colton | Staffordshire | 1859 | BT31 | 388 | 1453 |
| Oberlin Tin Mining Co. Ltd | Queensland | Australia | 1888 | BT31 | 4100 | 26303 |
| Ober-Rosbach Mining Co. Ltd | 1906 | BT31 | 17952 | 91315 | ||
| Oceania Nickel Mines Co. Ltd | 1900 | BT31 | 9284 | 68999 | ||
| Oil & Mining Development Syndicate Ltd | 1920 | BT31 | 26358 | 172060 | ||
| Oil & Mining Investors Ltd | 1911 | BT31 | 20100 | 116538 | ||
| Oil Mining Syndicate Ltd | 1930 | BT31 | 33165 | 246656 | ||
| Okehampton Mining Co | Okehampton | Devon | 1857 | BT41 | 526 | 2876 |
| Okehampton Mining Co. Ltd | Okehampton | Devon | 1866 | BT286 | 125 | |
| Okehampton Mining Co. Ltd | Okehampton | Devon | 1857 | BT31 | 263 | 878 |
| Okel Tor Co. Ltd | Calstock | Cornwall | 1881 | BT31 | 2752 | 14949 |
| Olathe Silver Mining Co. Ltd | Colorado | U.S.A. | 1881 | BT31 | 2813 | 15414 |
| Old Batholes Mining Co. Ltd | Shelve | Shropshire | 1871 | BT31 | 1619 | 5504 |
| Old Ebenezer Native Mines Ltd | 1901 | BT31 | 9526 | 70779 | ||
| Old Gang Lead Mining Co. Ltd | Melbecks | Yorkshire | 1889 | BT31 | 4343 | 28192 |
| Old Great Work Syndicate Ltd | Breage | Cornwall | 1892 | BT31 | 5372 | 36898 |
| Old Guard Mining Co. Ltd | Arizona | U.S.A. | 1887 | BT31 | 3869 | 24410 |
| Old Gunnislake Mining Co. Ltd | Calstock | Cornwall | 1865 | BT286 | 87 | |
| Old Herods Foot Silver Lead Mine Co. Ltd | Lanreath | Cornwall | 1870 | BT286 | 207 | |
| Old Hill Mines Drainage Co. Ltd | Lindal & Marton | Lancashire | 1872 | BT31 | 1688 | 6025 |
| Old Lout Mining Co. Ltd | Colorado | U.S.A. | 1888 | BT31 | 4065 | 25988 |
| Old Merryfield Lead Mining Co. Ltd | Bewerley | Yorkshire | 1873 | BT31 | 1801 | 6879 |
| Old Owlacombe Mines Ltd | Ashburton | Devon | 1881 | BT31 | 2804 | 15363 |
| Old Shepherds Mines Ltd | Newlyn East | Cornwall | 1881 | BT286 | 531 | |
| Old Talargoch Lead Mining Co. Ltd | Dyserth | Flintshire | 1874 | BT31 | 2013 | 8695 |
| Old Tincroft Consols Mining Co. Ltd | Towednack | Cornwall | 1874 | BT286 | 382 | |
| Old Treburgett Silver & Lead Mining Co. Ltd | St Teath | Cornwall | 1869 | BT286 | 181 | |
| Old Westminster Mining Co. Ltd | Llanarmon | Denbighshire | 1868 | BT31 | 1390 | 3906 |
| Old Wheal Neptune Mining Co. Ltd | Marazion | Cornwall | 1862 | BT31 | 645 | 2706 |
| Old Wheal Rose Silver Lead & Spathose Iron Mine Syndicate Ltd | Porthleven | Cornwall | 1873 | BT286 | 326 | |
| Oldham Mine Ltd | 1897 | BT31 | 7667 | 54729 | ||
| Ollomont Mines Ltd | 1903 | BT31 | 10227 | 76740 | ||
| Onda Mining Syndicate Ltd | nd | BT2 | 6051 | |||
| Ontario Mines Flotation Syndicate Ltd | 1898 | BT31 | 7935 | 56948 | ||
| Oola Hills Silver Lead Mining Co. Ltd | 1876 | BT31 | 2246 | 10691 | ||
| Oola Silver Lead & Copper Mining Co | Oola | Ireland | 1854 | BT41 | 529 | 2891 |
| Oola Silver Lead & Copper Mining Co. Ltd | Oola | Ireland | 1856 | BT31 | 208 | 640 |
| Oola Silver Lead Mining Co. Ltd | Ireland | 1876 | BT31 | 2246 | 10691 | |
| Opal Mines of Queensland Ltd | 1887 | BT31 | 3898 | 24626 | ||
| Ophir Mining & Smelting Co. of Utah Ltd | 1871 | BT31 | 1592 | 5289 | ||
| Oporto Mining Co. Ltd | 1863 | BT31 | 804 | 546C | ||
| Orchard Mining Co. Ltd | Winster | Derbyshire | 1857 | BT31 | 311 | 1080 |
| Orchard Mining Co. Ltd | Winster | Derbyshire | BT41 | 529 | 2896 | |
| Orcopampa (Peru) Silver Mines Ltd | 1890 | BT31 | 4801 | 31790 | ||
| Ore Reduction & Smelting Company of South Africa Ltd | 1890 | BT31 | 4787 | 31690 | ||
| Oregon & Mines Development Co. Ltd | 1899 | BT31 | 8741 | 63973 | ||
| Orense Tin Mining & Smelting Co. Ltd | 1888 | BT31 | 4157 | 26841 | ||
| Orgiva & Calahonda Mines Ltd | 1897 | BT31 | 7300 | 51664 | ||
| Oriental Mines Syndicate Ltd | 1896 | BT31 | 7143 | 50390 | ||
| Oriental Prospecting Syndicate Ltd | 1893 | BT31 | 5661 | 39513 | ||
| Oriental Prospecting Syndicate Ltd | 1925 | BT31 | 29026 | 205334 | ||
| Original Five Lorrain Mining Co. Ltd | 1909 | BT31 | 18978 | 104647 | ||
| Orion Diamond Mining Co. Ltd | 1881 | BT31 | 2831 | 15551 | ||
| Orion Mines Ltd | 1903 | BT31 | 10431 | 78604 | ||
| Ormond Slate Quarries Ltd | Ireland | 1890 | BT31 | 4900 | 32606 | |
| Ormonde Slate Quarries Ltd | Ireland | 1913 | BT31 | 21721 | 131180 | |
| Oro Fino Mines Ltd | 1888 | BT31 | 4152 | 26801 | ||
| Oso Mining Co. Ltd | 1912 | BT31 | 20681 | 122146 | ||
| Osom’s Hill Mining Co. Ltd | BT41 | 532 | 2904 | |||
| Otea Copper Mining Co. Ltd | New Zealand | 1864 | BT31 | 881 | 924C | |
| Ottoman Mining Association Ltd | 1881 | BT31 | 2801 | 15337 | ||
| Ottos Kopje Diamond Mines (1903) Ltd | 1903 | BT31 | 10516 | 79396 | ||
| Ottos Kopje Diamond Mines Ltd | 1896 | BT31 | 7010 | 49386 | ||
| Ottos Kopje Diamond Mines Ltd | 1898 | BT31 | 8112 | 58550 | ||
| Ottos Kopje Diamond Mines Ltd | 1891 | BT31 | 4964 | 33157 | ||
| Ottoskopje Diamond Mines Ltd | 1900 | BT31 | 9014 | 66690 | ||
| Ousby Mining Co. Ltd | Ardell Head | Cumberland | 1884 | BT31 | 3369 | 20087 |
| Ovejo Mines & Works Co. Ltd | 1876 | BT31 | 2291 | 11043 | ||
| Oversea Mining Syndicate Ltd | 1912 | BT31 | 20902 | 124067 | ||
| Oviedo Mines Development Syndicate Ltd | 1901 | BT31 | 9310 | 69210 | ||
| Ovoca Copper Syndicate Ltd | Ovoca | Ireland | 1902 | BT31 | 31851 | 71995 |
| Owen Vean & Tregurtha Downs Mines Ltd | St Hilary | Cornwall | 1882 | BT31 | 2947 | 16487 |
| Oxnam Prospecting Co., (No.1.) Ltd | 1903 | BT31 | 10236 | 76831 | ||
| Pachuca Mining Syndicate Ltd | 1913 | BT31 | 21503 | 129369 | ||
| Pachuca Silver Mining Co. Ltd | BT41 | 533 | 2918 | |||
| Pachuca Silver Mining Co. Ltd | Mexico | 1860 | BT31 | 483 | 1904 | |
| Pacific Coast Mining Co. Ltd | 1882 | BT31 | 3054 | 17354 | ||
| Pacific Mining Co. Ltd | 1869 | BT31 | 1500 | 4655 | ||
| Pacific Smelting Co. Ltd | 1902 | BT31 | 16866 | 74502 | ||
| Paddington Consols Ltd | Cornwall | 1895 | BT31 | 6436 | 45395 | |
| Pahang Central Tin & Exploration Co. Ltd | Malaya | 1889 | BT31 | 4338 | 28168 | |
| Pahang Corporation Ltd | Malaya | 1890 | BT31 | 3998 | 25432 | |
| Pahang Exploration & Development Co. Ltd | Malaya | 1889 | BT31 | 4357 | 28304 | |
| Palhal Mining Co. Ltd | 1883 | BT2 | 1199 | |||
| Palmarejo Mining Co. Ltd | Mexico | 1886 | BT31 | 3695 | 22980 | |
| Palnure United Exploring Co. Ltd | 1895-1902 | BT2 | 2979 | |||
| Pambula Mines Ltd | 1897 | BT31 | 7186 | 50789 | ||
| Pambula Mines Ltd | 1899 | BT31 | 8703 | 63547 | ||
| Panama Mining & Mineral Syndicate Ltd | 1910 | BT31 | 13063 | 107208 | ||
| Pandora Lead Mining Co. Ltd | Trefriw | Caernarvonshire | 1876 | BT31 | 2286 | 11009 |
| Pant Du & Waenlas Mining Co. Ltd | Llanferres | Denbighshire | 1864 | BT31 | 986 | 1478C |
| Pant y Buarth Lead Mining Co. Ltd | Llanferres | Denbighshire | 1860 | BT31 | 507 | 2012 |
| Pant y Buarth Lead Mining Co. Ltd | Llanferres | Denbighshire | 1887 | BT31 | 3851 | 24260 |
| Pant y Gaseg Copper Mining Co. Ltd | Amlwch | Anglesey | 1872 | BT31 | 1779 | 6710 |
| Pant y Mwyn Lead Mining Co. Ltd | Mold | Flintshire | 1872 | BT31 | 1748 | 6496 |
| Pant y Ne Lead Mining Co. Ltd | Holywell | Flintshire | 1866 | BT31 | 1221 | 2812C |
| Pantffynnon Silver Lead Mine Co. Ltd | Cefngwyn | Cardiganshire | 1874 | BT31 | 1956 | 8242 |
| Pantypydew Mining Co. Ltd | Holywell | Flintshire | 1861 | BT31 | 526 | 2110 |
| Panuncillo Copper Mining Co. Ltd | 1863 | BT31 | 773 | 397C | ||
| Par Consols Tin Mining Co. Ltd | St Blazey | Cornwall | 1881 | BT286 | 536 | |
| Par Great Consols Ltd | St Blazey | Cornwall | 1881 | BT31 | 2812 | 15404 |
| Par Smelting Works Ltd | Par | Cornwall | 1879 | BT31 | 2483 | 12742 |
| Par Tin Mine Ltd | St Blazey | Cornwall | 1883 | BT286 | 552 | |
| Par Tin Mine Ltd | St Blazey | Cornwall | 1883 | BT286 | 20 | |
| Paramatta Copper Mines Ltd | 1899 | BT31 | 8542 | 62194 | ||
| Parbola Ltd | Gwinear | Cornwall | 1906 | BT31 | 11666 | 90225 |
| Parbola Mining Co. Ltd | Gwinear | Cornwall | 1874 | BT286 | 391 | |
| Parbola Tin Mining Co. Ltd | Gwinear | Cornwall | 1888 | BT286 | 587 | |
| Parbola Tin Mining Co. Ltd | Gwinear | Cornwall | 1888 | BT286 | 108 | |
| Parc Lead & Zinc Mining Co. Ltd | Llanrwst | Caernarvonshire | 1893 | BT31 | 5636 | 39280 |
| Pari Brazilian Mining Co. Ltd | BT41 | 536 | 2941 | |||
| Paringa Celebration Mining Syndicate Ltd | 1920 | BT31 | 32417 | 166720 | ||
| Paringa Consolidated Mines Ltd | 1898 | BT31 | 8087 | 58314 | ||
| Paringa Mines Ltd | 1902 | BT31 | 9859 | 73463 | ||
| Park Arthur Lead Mining Co. Ltd | 1922 | BT31 | 27410 | 183967 | ||
| Park Hill Mining Co. Dean Forest Ltd | Gloucestershire | BT41 | 537 | 2945 | ||
| Park Lead Mining Co. Ltd | Esclusham Above | Denbighshire | 1861 | BT31 | 567 | 2323 |
| Park of Mines Consolidated Mining Co. Ltd | St Enoder | Cornwall | 1871 | BT286 | 235 | |
| Parka Mines Consols Ltd | St Enoder | Cornwall | 1880 | BT286 | 503 | |
| Parka Tin Mines Ltd | St Enoder | Cornwall | 1911 | BT31 | 20367 | 119204 |
| Park-an-Chy Tin Ltd | Redruth, Park-an-Chy | Cornwall | 1926 | BT31 | 32781 | 216914 |
| Parkanchy Wolfram Ltd | Redruth, Park-an-Chy | Cornwall | 1909 | BT31 | 12738 | 102448 |
| Parkside & Birks Mining Co. Ltd | 1920 | BT31 | 32456 | 171170 | ||
| Parkside Mining Co. Ltd | 1919 | BT31 | 25257 | 160865 | ||
| Parral (Mexico) Mining Corporation Ltd | Mexico | 1906 | BT31 | 33774 | 88007 | |
| Parral Mines Ltd | 1901 | BT31 | 9426 | 70043 | ||
| Parrys Mountain Mines Co. Ltd | Amlwch | Anglesey | 1870 | BT31 | 1559 | 5047 |
| Parton Haematite Iron Co. Ltd | 1874 | BT31 | 1930 | 7983 | ||
| Parys Copper Corporation Ltd | Amlwch | Anglesey | 1879 | BT31 | 2506 | 12923 |
| Parys Mines Co. Ltd | Amlwch | Anglesey | BT41 | 537 | 2948 | |
| Parys Mines Co. Ltd | Amlwch | Anglesey | 1860 | BT31 | 461 | 1778 |
| Patara Silver Lead Mining & Smelting Co. Ltd | 1873-1903 | BT2 | 511 | |||
| Pateley Bridge Co. Ltd | Bewerley | Yorkshire | 1879 | BT31 | 2510 | 12962 |
| Pateley Bridge Lead Mines & Smelting Co. Ltd | Bewerley | Yorkshire | 1875 | BT31 | 2112 | 9589 |
| Pateley Mines Ltd | Bewerley | Yorkshire | 1926 | BT31 | 29534 | 214655 |
| Patent Shaft & Axletree Co. Ltd | Staffordshire | 1889 | BT31 | 4512 | 29477 | |
| Patent Tunnelling & Mining Machine Co. Ltd | 1861 | BT31 | 597 | 2489 | ||
| Patents Mining & Financial Trust Ltd | 1890 | BT31 | 4706 | 31013 | ||
| Patricia Mining Syndicate Ltd | 1912 | BT31 | 20559 | 121075 | ||
| Pattersyke & Clargill Head Mining Co. Ltd | Tynehead | Cumberland | 1881 | BT31 | 2873 | 15860 |
| Pattersyke Mining Co. Ltd | Tynehead | Cumberland | 1868 | BT31 | 1383 | 3861 |
| Pay Rock Silver Mines Ltd | Colorado | U.S.A. | 1890 | BT31 | 4921 | 32779 |
| Peace River Mining & Navigation Syndicate Ltd | 1911 | BT31 | 19891 | 114438 | ||
| Peak Mining & Minerals Co. Ltd | 1919 | BT31 | 24843 | 157189 | ||
| Peel River Land & Mineral Co. Ltd | Australia | 1881 | BT31 | 45938 | 165 | |
| Peel River Land & Mineral Co. Ltd | Australia | 1880 | BT31 | 45937 | 165 | |
| Peevor United Mines Ltd | Scorrier | Cornwall | 1911 | BT31 | 20183 | 117390 |
| Pelyn Mines Ltd | Lanlivery | Cornwall | 1905 | BT31 | 11269 | 86148 |
| Pembroke Mining Syndicate Ltd | Wales | 1893 | BT31 | 5597 | 38975 | |
| Pen y Bryn Halkyn Lead Mine Ltd | Halkyn | Flintshire | 1895 | BT31 | 6532 | 45974 |
| Pen y Bryn Mining Co. Ltd | Halkyn | Flintshire | 1878 | BT31 | 2447 | 12434 |
| Pen y Clyn Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1871 | BT31 | 1661 | 5832 |
| Pen y Clyn Mining Co. Ltd | Llanidloes | Montgomeryshire | 1860 | BT31 | 474 | 1848 |
| Pen y Clyn Mining Co. Ltd | Llanidloes | Montgomeryshire | 1860 | BT41 | 554 | 3040 |
| Pen yr Henblas Lead Mining Co. Ltd | Halkyn | Flintshire | 1871 | BT31 | 1631 | 5578 |
| Pen yr Henblas United Mines Co. Ltd | Halkyn | Flintshire | 1889 | BT31 | 4490 | 29331 |
| Pen yr Henblas United Mines Co. Ltd | Halkyn | Flintshire | 1889 | BT31 | 4490 | 29331 |
| Pen yr Orsedd Lead Mining Co. Ltd | Halkyn | Flintshire | 1879 | BT31 | 2520 | 13020 |
| Penaflor Copper Mines Ltd | 1889 | BT31 | 4536 | 29690 | ||
| Penallt Silver Lead Mining Co. Ltd | 1869 | BT31 | 1491 | 4588 | ||
| Penbedw Lead Mining Co. Ltd | Mold | Flintshire | 1876 | BT31 | 2209 | 10399 |
| Pencraig United Lead Mining Co. Ltd | Llanwrst | Caernarvonshire | BT41 | 552 | 3031 | |
| Pencraig United Lead Mining Co. Ltd | Llanwrst | Caernarvonshire | 1860 | BT31 | 501 | 1984 |
| Pengarreg Silver Lead Mining Co. Ltd | Talley | Carmarthenshire | 1881 | BT31 | 2850 | 15685 |
| Pengenna Silver-Lead Mines Ltd | 1924 | BT31 | 32627 | 197643 | ||
| Penhale & Barton Mining Co. Ltd | St Enoder | Cornwall | 1873 | BT286 | 352 | |
| Penhale & Barton United Mines Ltd | St Enoder | Cornwall | 1881 | BT286 | 532 | |
| Penhale & Lomax Consolidated Silver Lead Mining Co. Ltd | Perranzabuloe | Cornwall | 1865 | BT286 | 111 | |
| Penhale Tin Mine Ltd | St Enoder | Cornwall | 1875 | BT286 | 414 | |
| Penhale United Silver Lead Mining Co. Ltd | Perranzabuloe | Cornwall | 1867 | BT286 | 155 | |
| Penhale Wheal Vor Tin & Copper Mining Co. Ltd | Breage | Cornwall | 1874 | BT286 | 378 | |
| Peninsula Prospecting Co. Ltd | 1918 | BT31 | 24136 | 151076 | ||
| Peninsular Mining Co. Ltd | BT41 | 553 | 3036 | |||
| Peninsular Mining Co. Ltd | 1856 | BT31 | 158 | 477 | ||
| Peninsular Prospecting Co. Ltd | 1907 | BT31 | 11909 | 92747 | ||
| Pennance Consols Silver Lead & Copper Mining Co. Ltd | Budock | Cornwall | 1864 | BT286 | 37 | |
| Pennant Barytes & Lead Co. Ltd | St Asaph | Flintshire | 1875 | BT31 | 2151 | 9966 |
| Pennant Vale Slate Quarry & Copper Mine Co. Ltd | Merionethshire | 1872 | BT31 | 1737 | 6408 | |
| Pennerley Lead Mining Co. Ltd | Minsterley | Shropshire | 1878 | BT31 | 2458 | 12543 |
| Pennerley Mining Co. Ltd | Minsterley | Shropshire | 1871 | BT31 | 1602 | 5375 |
| Penralt Silver Lead Mining Co. Ltd | Llanidloes | Montgomeryshire | 1858 | BT31 | 357 | 1304 |
| Penralt Silver Lead Mining Co. Ltd | Wales | BT41 | 552 | 3033 | ||
| Penralt Silver Lead Mining Co. Ltd | Wales | 1869 | BT31 | 1491 | 4588 | |
| Penrhyn Copper Mining Syndicate Ltd | Penrhyndeudraeth | Merionethshire | 1899 | BT31 | 8372 | 60848 |
| Penrhyn Mining Co. Ltd | Cornwall | 1870 | BT31 | 1514 | 4735 | |
| Penrhyndendraeth Lead Mining Co. Ltd | Llanfrothen | Merionethshire | 1875 | BT31 | 2139 | 9851 |
| Penrith District Mining Co. Ltd | Penrith | Cumberland | 1872 | BT31 | 1707 | 6169 |
| Penstruthal Consols Tin & Copper Mining Co. Ltd | Gwennap | Cornwall | 1872 | BT286 | 273 | |
| Penstruthal Tin & Copper Mining Co. Ltd | Gwennap | Cornwall | 1870 | BT286 | 193 | |
| Pensyflog Iron Mining Co. Ltd | Porthmadog | Merionethshire | 1872 | BT31 | 1742 | 6437 |
| Pentre Halkin Hall Lead Mining Co. Ltd | Pentre Halkyn | Flintshire | 1880 | BT31 | 2631 | 13951 |
| Pentre Halkin Mining Co. Ltd | Pentre Halkyn | Flintshire | 1892 | BT31 | 5406 | 37257 |
| Pentre Lygan Lead Mining Co. Ltd | Halkyn | Flintshire | 1861 | BT31 | 546 | 2210 |
| Peona Lead Mining & Smelting Co. Ltd | 1868 | BT31 | 1384 | 3868 | ||
| Perak Tin Prospecting Syndicate Ltd | 1908 | BT31 | 12551 | 100021 | ||
| Percy & Kelly Nickel Cobalt & Chrome Iron Mining Co. Ltd | New Caledonia | 1875 | BT31 | 2143 | 9894 | |
| Perdu Carta Lead Mining Co. Ltd | 1869 | BT31 | 1443 | 4272 | ||
| Perkins Beach Consols Ltd | Chirbury | Shropshire | 1881 | BT31 | 2805 | 15365 |
| Perkins Beach Lead Mine Ltd | Chirbury | Shropshire | 1877 | BT31 | 2310 | 11180 |
| Perkins Beach Mine Ltd | Chirbury | Shropshire | 1870 | BT31 | 1509 | 4716 |
| Perran Consols Tin Mining Co. Ltd | Perranzabuloe | Cornwall | 1873 | BT286 | 340 | |
| Perran Mining Co. Ltd | Cornwall | 1906 | BT31 | 11556 | 89129 | |
| Perran Wheal Vyvyan Silver Lead Mining Co. Ltd | Perranzabuloe | Cornwall | 1871 | BT286 | 226 | |
| Perranzabuloe Mining Syndicate Ltd | Perranzabuloe | Cornwall | 1925 | BT31 | 29332 | 210115 |
| Perserverancia Mining Co. Ltd | 1878 | BT31 | 2445 | 12415 | ||
| Perseverance Tin & Copper Mining Co. Ltd | Redruth | Cornwall | 1874 | BT286 | 392 | |
| Persian Bank Mining Rights Corporation Ltd | Persia | 1890 | BT31 | 4736 | 31269 | |
| Persian Mining Syndicate Ltd | Persia | 1916 | BT31 | 23364 | 144567 | |
| Persian Petroleum Syndicate Ltd | Persia | 1884-1894 | BT2 | 1416 | ||
| Pertusola Lead Mining & Smelting Co. Ltd | Italy | 1863 | BT31 | 774 | 401C | |
| Pertusola Lead Mining & Smelting Co. Ltd | Italy | 1863 | BT31 | 774 | 401C | |
| Peruvian Mining Co. Ltd | Peru | 1886 | BT31 | 3625 | 22331 | |
| Peruvian Mining Trust Ltd | Peru | 1912 | BT31 | 20955 | 124568 | |
| Peter Tavy & Mary Tavy Consols Copper Mining Co | Marytavy | Devon | 1850 | BT41 | 558 | 3056 |
| Peter Tavy & Mary Tavy Consuls Copper Mining Co. Ltd | Marytavy | Devon | 1857 | BT31 | 221 | 695 |
| Petroleum Mining & General Investment Corporation Ltd | 1907 | BT31 | 11910 | 92763 | ||
| Philanthropic Mutual & Indisputable General Life Assurance Society | BT41 | 559 | 3059 | |||
| Philippine & Laura Mining Co. Ltd | 1872 | BT31 | 1788 | 6780 | ||
| Phoenix & West Phoenix United Mines Co. Ltd | Linkinhorne | Cornwall | 1894 | BT31 | 5800 | 40678 |
| Phoenix Diamond Mining Co. Ltd | 1882 | BT31 | 2964 | 16626 | ||
| Phoenix Diamond Mining Co. Ltd. | 1882 | BT31 | 2964 | 16626 | ||
| Phoenix Mines (Cornwall) Ltd | Altarnun | Cornwall | 1909 | BT31 | 18887 | 103505 |
| Phoenix Mining Co. Ltd | Cornwall | 1885 | BT31 | 3451 | 20862 | |
| Phoenix Prospecting Syndicate Ltd | 1898 | BT31 | 7892 | 56552 | ||
| Phoenix Quicksilver Mining Co. Ltd | California | U.S.A. | 1872 | BT31 | 1775 | 6689 |
| Phoenix Silver Lead & Blende Mining Co. Ltd | Rhenish Prussia | Germany | 1870 | BT31 | 1534 | 4875 |
| Phoenix Silver Lead Mining Co. Ltd | Perranzabuloe | Cornwall | 1871 | BT286 | 249 | |
| Phoenix Smelting Co. Ltd | 1861 | BT31 | 557 | 2274 | ||
| Phoenix United Mines Ltd | Cornwall | 1907 | BT31 | 11932 | 92953 | |
| Phosphate Mines of Spain Ltd | Spain | 1890 | BT31 | 4882 | 32453 | |
| Picton Silver Lead Mining Co. Ltd | Llanasa | Flintshire | 1878 | BT31 | 2423 | 12211 |
| Piedmontese Mining Co. Ltd | Switzerland | 1857 | BT41 | 561 | 3063 | |
| Pierrefitte Mining Co. Ltd | France | 1880 | BT31 | 2607 | 13757 | |
| Pilbara Mining Syndicate Ltd | 1923 | BT31 | 27907 | 189927 | ||
| Pinnacles Broken Hill Mine Ltd | 1907 | BT31 | 11792 | 91527 | ||
| Pinos Altos (Mexico) Mining Co. Ltd | Mexico | 1879 | BT31 | 2519 | 13015 | |
| Pinos Altos Bullion Co. Ltd | Mexico | 1886 | BT31 | 3583 | 21996 | |
| Pinto Silver Mining Co. Ltd | Nevada | U.S.A. | 1871 | BT31 | 1606 | 5406 |
| Pintor & Pindella Mining Co. Ltd | 1866 | BT31 | 1281 | 3207 | ||
| Pioneer Exploration Co. Ltd | 1894-1928 | BT2 | 2729 | |||
| Pioneer Mining Co. Ltd | Talsarnan | Merionethshire | 1880 | BT31 | 2606 | 13749 |
| Pitsea Smelting Co. Ltd | 1912 | BT31 | 20483 | 120369 | ||
| Planet Silver Mining Co. Ltd | 1874 | BT31 | 2053 | 9015 | ||
| Planet Tin Mining Co. Ltd | 1873 | BT31 | 1899 | 7667 | ||
| Plantation Mining Co. Ltd | Holywell | Flintshire | 1898 | BT31 | 8266 | 59994 |
| Plâs Silver Lead Mining Co. Ltd | Flintshire | 1882 | BT31 | 3081 | 17617 | |
| Plas Winter Halkyn Mining Co. Ltd | Halkyn | Flintshire | 1888 | BT31 | 4036 | 25739 |
| Plasyn Rhos Mining Co. Ltd | Rhosesmor | Flintshire | 1882 | BT31 | 3038 | 17220 |
| Platinum (Ural) Mining Co. Ltd | 1911 | BT31 | 20385 | 119396 | ||
| Plumas Placer Syndicate Co. Ltd | 1895-1906 | BT2 | 2953 | |||
| Plusheys Mining Co. Ltd | Linkinhorne | Cornwall | 1883 | BT31 | 3185 | 18499 |
| Pluton Mining Co. Ltd | 1890-1895 | BT2 | 2052 | |||
| Plymouth Alpine Mining Co. Ltd | California | U.S.A. | 1887 | BT31 | 3803 | 23831 |
| Plympton Mining & Arsenical Co. Ltd | Plympton St Mary | Devon | 1879 | BT286 | 469 | |
| Plynlimmon Lead Mining Co. Ltd | Plynlimon | Cardiganshire | 1876 | BT31 | 2282 | 10969 |
| Plynlimmon Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1866 | BT31 | 1250 | 2995 |
| Plynlimmon Mining Co. Ltd | Ponterwyd | Cardiganshire | 1870 | BT31 | 1535 | 4879 |
| Plynlymon Consols Mining Co. Ltd | Plynlimon | Cardiganshire | BT41 | 564 | 3085 | |
| Poço Negro Silver Lead Mining Co. Ltd | 1882 | BT31 | 2966 | 16644 | ||
| Poderosa Mining Co. Ltd Vols 1, 2 & F | 1908 | BT31 | 39219 | 100436 | ||
| Podgora Mining Co. Ltd | 1874 | BT31 | 2011 | 8680 | ||
| Polberro Mine Co | St Agnes | Cornwall | 1899 | BT31 | 8697 | 63490 |
| Polberro Mine Co. | St Agnes | Cornwall | 1899 | BT31 | 8697 | 63490 |
| Polberro Tin Mining Co. Ltd | St Agnes | Cornwall | 1881 | BT286 | 539 | |
| Polbooth Tin Mine Ltd | 1886 | BT31 | 3778 | 23597 | ||
| Polhigey Tin Ltd | Wendron | Cornwall | 1926 | BT31 | 32795 | 218202 |
| Polmear Syndicate Ltd | St Austell | Cornwall | 1896 | BT31 | 7152 | 50469 |
| Polyear Tin Mining Co. Ltd | St Mewan | Cornwall | 1887 | BT31 | 3801 | 23815 |
| Pontons (Spain) Zinc and Lead Mines Ltd | Spain | 1911 | BT31 | 19989 | 115538 | |
| Pool Mining Co. Ltd | Camborne | Cornwall | 1908 | BT31 | 18598 | 100146 |
| Pool Park (Minera) Mining Co. Ltd | Esclusham Above | Denbighshire | 1864 | BT31 | 1014 | 1630C |
| Poorman Mines Ltd | 1890 | BT31 | 4885 | 32480 | ||
| Poorman Silver Mines (of Colorado) Ltd | Colorado | U.S.A. | 1891-1908 | BT2 | 2192 | |
| Porcupine (Canada) Mining & Development Co. Ltd | Canada | 1911 | BT31 | 20340 | 118981 | |
| Porkellis Tin Mine Ltd | Wendron, Basset & Grylls | Cornwall | 1933 | BT31 | 33465 | 280691 |
| Porkellis Tin Mines Ltd | Wendron, Basset & Grylls | Cornwall | 1915 | BT31 | 23081 | 142363 |
| Port Erin Mining Co. Ltd | Port Erin | Isle of Man | 1904 | BT31 | 10749 | 81479 |
| Port Nigel Lead Co. Ltd | Llanengan | Caernarvonshire | 1874 | BT31 | 1965 | 8334 |
| Port Nigel Mining Syndicate Ltd | Abersoch | Caernarvonshire | 1882 | BT31 | 2978 | 16748 |
| Port Royal & St Andrews Copper Mining Co. of Jamaica | Jamaica | BT41 | 569 | 3107 | ||
| Porthiven Bay Mining Co. Ltd | Wales | 1868 | BT31 | 1417 | 4101 | |
| Portland (Rossland) Mine Ltd | 1899 | BT31 | 8613 | 62770 | ||
| Portuguese Consolidated Copper Mines Ltd | Portugal | 1888 | BT31 | 4253 | 27578 | |
| Portuguese Mining Syndicate Ltd | Portugal | 1912 | BT31 | 20680 | 122126 | |
| Portumna Syndicate Ltd | Ireland | 1905 | BT31 | 11242 | 85882 | |
| Potosi Del Oro Ltd | Venezuela | 1892 | BT31 | 5292 | 36149 | |
| Pottsghyll Barytes Mining Co. Ltd | Caldbeck | Cumberland | 1917 | BT31 | 23659 | 147106 |
| Powell Consolidated Lead Mining Co. Ltd | 1872 | BT31 | 1761 | 6581 | ||
| Powell United Lead Mining Co. Ltd | Llanbadarnfawr | Cardiganshire | 1871 | BT31 | 1644 | 5682 |
| Powell United Silver Lead Mining Co. Ltd | Ponterwyd | Cardiganshire | 1862 | BT31 | 720 | 135C |
| Pradena Silver Mines Ltd (The) | Spain | 1888 | BT31 | 4247 | 27526 | |
| Preamimma Copper Mine Co. Ltd | 1861 | BT31 | 591 | 2458 | ||
| Premier Lead Mines Ltd | 1908 | BT31 | 12330 | 97327 | ||
| Prescott Development Syndicate Ltd | 1895-1936 | BT2 | 3069 | |||
| Prestea Mines Ltd | 1900 | BT31 | 9260 | 68813 | ||
| Prideaux Wood Tin Mining Co. Ltd | Lanlivery | Cornwall | 1872 | BT286 | 278 | |
| Prince Albert Consols Mining Co. Ltd | Perranzabuloe | Cornwall | 1864 | BT286 | 61 | |
| Prince Arthur Consolidated Mining Co. Ltd | Marytavy | Devon | 1863-1883 | BT2 | 150 | |
| Prince of Wales Mine Ltd | St Mellion | Cornwall | 1893 | BT31 | 5520 | 38317 |
| Prince Patrick Lead Mining Co. Ltd | Halkyn | Flintshire | 1872 | BT31 | 1751 | 6518 |
| Prince Patrick Mine Syndicate Ltd | Halkyn | Flintshire | 1887 | BT31 | 3977 | 25265 |
| Prince Royal Mining Co. Ltd | St Agnes | Cornwall | 1876 | BT286 | 442 | |
| Princess Alice Mining Co. Ltd | Llanfachreth | Merionethshire | 1862 | BT31 | 673 | 2865 |
| Probe Mining & Mineral Explorations Ltd | 1973 | BT31 | 45614 | 1111458 | ||
| Prospecting & General Developing Co. of West Australia Ltd | Australia | 1894 | BT31 | 5988 | 42243 | |
| Prospecting Syndicate Ltd | 1888 | BT31 | 4078 | 26118 | ||
| Prospecting Syndicate of Golgonda & the Neighbouring Districts Ltd | 1919 | BT31 | 24730 | 156139 | ||
| Prospidnick Mining Co. Ltd | Sithney | Cornwall | 1913 | BT31 | 21403 | 128540 |
| Providence Tin Mines Ltd | Cornwall | 1907 | BT31 | 12152 | 95337 | |
| Providencia & New Rosario Silver Mining Co. Ltd | 1876 | BT31 | 2297 | 11083 | ||
| Pucara Silver Mining Co. Ltd | 1882 | BT31 | 3083 | 17627 | ||
| Puzzle Mine Ltd | 1881 | BT31 | 2942 | 16448 | ||
| Pwll Roman Copper & Lead Mining Co. Ltd | Taliesin | Cardiganshire | 1861 | BT31 | 544 | 2203 |
| Pyramid Mining Smelting & Refining Co. Ltd | 1898 | BT31 | 8026 | 57760 | ||
| Pyrenees Copper Mines Ltd | France | 1899 | BT31 | 8522 | 62019 | |
| Pyrenees Minerals Ltd | France | 1902 | BT31 | 16813 | 73636 | |
| Pyrenees Mines Ltd | France | 1894 | BT31 | 5919 | 41631 | |
| Pyrenees Mining Co. Ltd | France | 1878 | BT31 | 2418 | 12160 | |
| Pyrenees Syndicate Ltd | France | 1907 | BT31 | 11883 | 92449 | |
| Pyrites Smelting Co. Ltd | 1882 | BT31 | 3041 | 17254 |
