| Uberhebe Copper Mines & Smelter Co |
CA |
| UGI Gold Development Co |
CO |
| Uida Consolidated Mines Co |
ID |
| Uion Zinc Co |
TN |
| Uionville Mining Co |
NV |
| Ukonom Mines |
CA |
| Ultramar SAPA |
AZ |
| UmatillaTonopah Mining Co |
NV |
| Umpqua Cons |
OR |
| Unaweep Mining Co |
CO |
| Uncle Bim Mining Co |
UT |
| Uncle Dudley Mining Co |
AZ |
| Uncle Sam Consolidated Mining Co |
UT |
| Uncle Sam Mine |
AZ |
| Uncle Sam Mine |
CO |
| Uncle Sam Mines |
CA |
| Uncle Sam Mining & Development Co |
ID |
| Uncle Sam Mining Co |
WA |
| Underwriters Land Co Inc |
Tri State |
| Underwriters Mining Co |
OK |
| U-Nev-Ida Gold Mining Co |
UT, NV |
| Ungalik Syndicate |
AK |
| Union Associated Mines Co |
UT |
| Union Basin Mining & Refining Co |
CA |
| Union Blue Gravel Mining Co |
CA |
| Union Carbide Co |
NV |
| Union Carbonate Mines Inc |
CO |
| Union Central Gold Mines Inc |
CA |
| Union Chief Mining Co |
UT |
| Union Consolidated Mines |
NV |
| Union Consolidated Mines Co |
AZ |
| Union Copper Land & Mining Co |
MI |
| Union Copper Mining Co |
CA |
| Union Development Co |
CA |
| Union Extn Mining Co |
AZ |
| Union Gold & Silver Mines Corp |
AZ, CA |
| Union Gold Mine Co |
NV |
| Union Gold Mines Co |
DE |
| Union Gold Mining & Milling Co |
CA |
| Union Hill Gold Mining Co |
CA |
| Union Hill Mining Co |
SD |
| Union Leaf Mines Co |
CO |
| Union Mines Co |
AZ |
| Union Mines Co |
NV |
| Union Mines Inc |
CA |
| Union Mining & Development Co |
CO |
| Union Mining & Smelting Co |
WA |
| Union Mining Co |
KS |
| Union Mining Co |
UT |
| Union Silver Mining Co |
WA |
| Union Sulphur Co |
TX, LA |
| Unit System Exploration Co |
CO |
| Unitah Copper Co |
UT |
| Unitah Treasure Hill Mining Co |
UT |
| UnitahTreasure Hill Mining Co |
UT |
| United American Copper Co |
AZ |
| United American Mines Co Ltd |
ID |
| United American Mining Co |
AZ |
| United American Mining Co |
CA |
| United American Mining Corp |
CO |
| United Ariz Mining Co |
AZ |
| United Bingham Copper Co |
UT |
| United Cascade Mining Co |
WA |
| United Comstock Mines Co |
NV |
| United Comstock Mining Co |
AZ |
| United Comstock Pumping Assn |
NV |
| United Concentrating Co |
IL |
| United Copper Co |
OR |
| United Copper Gold Mines Co |
OR |
| United Copper Mines Co Inc |
NC |
| United Copper Mining Co |
WA |
| United Development Corp |
ID |
| United Development Mining Co |
NV |
| United Diversified Mines Corp |
ID |
| United Eastern Gold Mining Co |
AZ |
| United Eastern Mines Corp |
AZ |
| United Eastern Mining Co |
AZ |
| United Freeland Development & Tunnel Co |
CO |
| United Gilpin Corp of Denver |
CO |
| United Globe Mines |
AZ |
| United Gold & Silver Mining Co |
AZ |
| United Gold Corp |
DE |
| United Gold Mines Corp |
MT |
| United Gold Mines Inc |
CA |
| United Gold Mines Inc |
NV |
| United Gold Mines Inc |
WA |
| United Gold Mining & Milling Corp |
CA |
| United Gold Placers Inc |
WA |
| United Gold Prod Co |
ID |
| United Gold Properties Inc |
NV |
| United Goldfields Co |
NV |
| United Grizzly Ridge Mining Co |
CA |
| United Imperial Mines Co |
NV |
| United Imperial Mining Co |
CO |
| United Jerome Copper Co |
AZ |
| United Lead Zinc Mines Co |
ID |
| United Lodi Mines Co |
NV |
| United Lsng Co |
MT |
| United Magma Copper Co |
AZ |
| United Mammoth Gold Mining Co |
NV |
| United Manes & Smelter Co |
CO |
| United Metals Co |
CA |
| United Metals Co |
ID |
| United Metals Co |
NV |
| United Metals Co |
OR |
| United Metals Corp |
NM |
| United Metals Mining Co |
ID |
| United Metals Mining Co |
NM |
| United Metals Mining Co |
NV |
| United Mexican Mining & Exploration Co |
AZ |
| United Milling & Development Co |
NV |
| United Mines & Metals Corp |
AZ |
| United Mines & Metals Corp |
ID |
| United Mines Co |
CA |
| United Mines Co |
CA |
| United Mines Co |
CO |
| United Mines Co |
ID |
| United Mines Co |
MO |
| United Mines Co of Idaho Inc |
ID |
| United Mines Corp |
WA |
| United Mines Development Assn |
CA |
| United Mines Finance Corp |
CO |
| United Mines Inc |
CA |
| United Mines Inc |
CO |
| United Mines Inc |
MO |
| United Mines Mercury Co |
ID |
| United Mining & Engrg Assoc of Nev |
CA |
| United Mining Co |
KY |
| United Mining Co |
NV |
| United Mining Co |
OK |
| United MM & Copper Smelting Co |
MD, PA |
| United Northern Mines Co |
AZ |
| United Operating Trust Inc |
CO |
| United Placers Ltd |
CA |
| United Promontory Mining Co |
UT |
| United Properties Co of Calif |
CA |
| United Quarries Inc |
CA |
| United Quartz Claims Inc |
CA |
| United Republic Gold Mining Co |
AZ |
| United Revenue Mines Corp |
NV |
| United States Asbestos Corp Ltd |
CA |
| United States Chrome Mines Inc |
NV |
| United States Chromium Inc |
OR |
| United States Continental Mines Co |
AZ |
| United States Continental Mines Corp |
AZ |
| United States Copper Co |
NM |
| United States Copper Mining Co |
AZ |
| United States Exploration & Mining Co |
UT |
| United States Exploration Co |
CA |
| United States G & S Mines Co |
AZ |
| United States Gold Corp |
CA |
| United States Gold Dredger Corp |
WA |
| United States Gold Inc |
OR |
| United States Gold Mining & Milling Co |
NV |
| United States Gold Reserve Inc |
CO |
| United States Lead & Zinc Co |
UT |
| United States Manganese Corp |
DE |
| United States Metals Co |
OR |
| United States Metals Corp |
NM |
| United States Mines |
AZ |
| United States Mines of Colo Inc |
CO |
| United States Mining & Development Co |
MT |
| United States Mining Co |
OR |
| United States Mining Corp |
CO |
| United States Nickel Co |
NJ |
| United States Platinum Co |
AZ |
| United States Silver-Lead Mines |
CO |
| United States Tin Co |
CA |
| United States Treasury Mines Co |
NM |
| United States Tungsten Mines Co Ltd |
US |
| United States Vanadium Development Co |
AZ |
| United States Zinc Co |
TX |
| United Tintic Mining Co |
UT |
| United Treasure Mining Co |
WA |
| United Trinity Mines |
CA |
| United Tungsten Copper Mines |
CA |
| United Utilities Corp |
ID |
| United Vanadium Corp |
AZ |
| United Vanadium Mines |
AZ |
| United Verde Consolidated Co |
AZ |
| United Verde Extn Mining Co |
AZ |
| United Verde Jr Co |
AZ |
| United Vexde Extn Gold Silver Copper Mining Co |
AZ |
| United Wedekind Mines Co |
NV |
| United Weenah & Western Mines Corp |
NV |
| United Western Gold Mine Co |
AZ |
| United Western Metals Co |
AZ |
| United Western Mines |
NV |
| United Western Mines Corp Re-org |
AZ |
| United Western Mines Inc |
CA |
| United Western Mining Co |
AZ |
| Unity Development Co |
AZ |
| Unity Development Co |
CO |
| Unity Gold Mines Co |
ID |
| Unity Gold Mines Co |
NV |
| Unity Gold Production Co |
ID |
| Unity Mines Corp |
AZ |
| Unity Mutual Trust Co |
CO |
| Universal Alaskan Corp |
OR |
| Universal Dredging Co |
CA |
| Universal Exploration Co |
NV |
| Universal Exploration Co |
OK |
| Universal Gold Placers Mining Co |
NM |
| Universal Lead Mines Co |
MT |
| Universal Metals Recovery Synd |
CA |
| Universal Mining & Milling Co |
CA |
| Universal Mining & Milling Co |
CO |
| Universal Mining Co |
CA |
| Universal Mining Co |
DE |
| Universal Ore Milling & Mining Co |
CA |
| Universal Ore Prod Synd |
CO |
| Universal Placer Mining Corp |
AZ |
| Universal Placer Mining Corp |
CA |
| Universal Placer Mining Corp |
NM |
| Universal Zonolite Insulation Co |
MT |
| UniWyStates Molybdenum Corp |
CO |
| Unuk Valley Gold Synd |
AK |
| Uotilla Ogrz & Keturia Group |
AK |
| Upper Lead Mining Co |
CA |
| Upper Red River Placers |
ID |
| Upper Sageland Mining Co |
CA |
| Upper Union Mining Co |
DE |
| UPR Milling & Mining Co |
CO |
| Up-To-Date Mining Co |
CA |
| Urada Gold Mines Co |
NV |
| Urada Gold Silver Mines Co Inc |
NV |
| Urschel Lead & Zinc Mines Inc |
AR |
| US Radium Corp |
CO |
| US Vanadium Ca |
CO |
| Usona Mines Co |
NV |
| Utacala Exploration Co |
CA |
| Utah & Eastern Copper Co |
UT |
| Utah Alloys Ores Inc |
UT |
| Utah Apex Mining Co |
UT |
| Utah Baltimore Consolidated Co |
UT |
| Utah Calif Mining & Milling Co |
CA |
| Utah Cave Mining & Milling Co |
UT |
| Utah Centennial Mining Co |
UT |
| Utah Consolidated Mines Co of Tintic |
UT |
| Utah Consolidated Mining Co |
UT |
| Utah Delaware Mining Co |
UT |
| Utah Fortuna Gold Co |
UT |
| Utah Gold & Copper Co |
UT |
| Utah Gold Co |
UT |
| Utah Gold Inc |
UT |
| Utah Gold Mining Co |
UT |
| Utah Hills Extn Mining Co |
UT |
| Utah Hills Mining Co |
UT |
| Utah Idaho Mining Co |
UT |
| Utah Lead & Copper Co |
UT |
| Utah Majestic Mines Co |
UT |
| Utah Mammoth Mining Co |
UT |
| Utah Mercury Gold Mining Co |
UT |
| Utah Metal Mining Co |
UT |
| Utah Mining & Milling Co |
ID |
| Utah Mining Co |
NV |
| Utah Mining Co |
UT |
| Utah Oregon Gold Mines Co |
OR |
| Utah Peruvian Lead Co |
UT |
| Utah Placer Co |
UT |
| Utah Placer Gold Mines Inc |
UT |
| Utah Placer Mining Co |
UT |
| Utah Premier Mining Co |
UT |
| Utah Quicksilver Co |
UT |
| Utah Radium Mines Co |
UT |
| Utah Revenue Mines Corp |
UT |
| Utah Silver Co |
UT |
| Utah Silver Lake Mining Co |
UT |
| Utah Silver Lead Co |
UT |
| Utah Silver Reef Mining Co |
UT |
| Utah Southern Mining Co |
UT |
| Utah Standard Gold Mining Co |
UT |
| Utah Standard Mines Co |
UT |
| Utah State Silver Mining Co |
UT |
| Utah Sulphur & Refining Co |
UT |
| Utah Sulphur Co |
UT |
| Utah Sulphur Industries |
UT |
| Utah Tungsten Mining Corp |
UT |
| Utah Vanadium Corp |
CO |
| Utah Zinc Co |
CO |
| Utah Zinc Oxide Co |
UT |
| Utah-Bellevue Mines Co |
ID |
| Utah-Boston Development Co |
UT |
| Utah-Colorado Mining & Milling Co |
CO |
| Utah-Idaho Mining & Milling Co |
ID |
| Utah-Indiana Mining & Milling Co |
UT |
| Utah-United Copper Co |
UT |
| Utana Mining Corp |
ID |
| Ute Copper Co |
UT |
| Ute Gold Mining Co |
CO |
| Ute Gold Mining Co |
NM |
| Utica Mining & Milling Co |
CO |
| Utica Mining Co |
CA |
| Utica Mining Co |
CO |
| Utical Gold Mining Co |
CA |
| Utopia Mining & Milling Co |
WY |
| Utter Geo, H |
NM |
| Uvada Copper Co |
NV |
| Uvada Gold Silver Mining Co |
NV |
