Gold mines in Boulder County, Colorado

Boulder County has 28 gold mines in MSHA records: 2 not abandoned (2 non-producing) and 26 abandoned. USGS lists 428 more historic producers.

Gold mines in Boulder County that are not abandoned

MineTypeMSHA statusEmployees
Consolidated Caribou DistrictundergroundNon-producing12
Cross MineundergroundNon-producing12

Abandoned gold mine records in Boulder County

26 records marked abandoned by MSHA. They are listed for reference only. Land status is from BLM's public dataset and can be out of date; being on public land is not permission to enter old workings.

Show the 26 abandoned records
NameTypeStatus sinceNearest townLandUSGS record
AurumundergroundJul 3, 1985n/an/an/a
Badger a Group of MinesundergroundOct 1, 2019BoulderFederal land in a US Forest Service national forest or grasslandOccurrence
Big Five TunnelundergroundJul 11, 1984n/an/an/a
Black RoseundergroundJul 22, 2008JamestownFederal land in a US Forest Service national forest or grasslandOccurrence
Boulder Milling Incorporatedprocessing facilityJan 10, 1986n/an/an/a
Bueno Millprocessing facilityOct 1, 2007JamestownFederal land in a US Forest Service national forest or grasslandOccurrence
Bueno MineundergroundOct 1, 2007JamestownFederal land in a US Forest Service national forest or grasslandOccurrence
California ShaftundergroundJul 11, 1984n/an/an/a
Captain Jack MillsurfaceSep 7, 1989n/an/an/a
Cash MineundergroundJul 9, 2009BoulderFederal land managed by the Bureau of Land ManagementPast producer
ColumbineundergroundMay 20, 1982n/an/an/a
Com Incprocessing facilityMay 4, 1996n/an/an/a
Dew Drop TunnelundergroundJul 11, 1984n/an/an/a
Fortune-Senator Hill MineundergroundApr 23, 1985n/an/an/a
Gold Hill millprocessing facilityNov 21, 2018BoulderFederal land managed by the Bureau of Land ManagementPast producer
Golden AgeundergroundSep 9, 1986n/an/an/a
Golden BellsundergroundSep 22, 1994n/an/an/a
Grand CentralundergroundSep 9, 1986n/an/an/a
Hopewell & Rusty Horseshoe LodeundergroundFeb 8, 1980n/an/an/a
Keystone MineundergroundApr 23, 1985n/an/an/a
Marion Millprocessing facilityJul 9, 1992n/an/an/a
Mogul MineundergroundDec 16, 1997n/an/an/a
Ramey MineundergroundJan 14, 1983n/an/an/a
Rife MineundergroundNov 7, 1983n/an/an/a
Spruce Gulch MineundergroundSep 22, 1986n/an/an/a
Wood Mountain GroupundergroundJul 5, 1985n/an/an/a

Historic gold producers in Boulder County (USGS)

USGS records 428 historic gold producers in Boulder County: 389 past producers and 39 listed as producers or plants. For 1 of them USGS gives an output size (1 small). The most common deposit type is alkaline Au-Te (Au-Ag-Te veins) (18 sites).

Show the 300 biggest of 428 sites
SiteUSGS statusOutputCommoditiesYears
Bell GroupPast producersmallGold, Silver, Uraniumn/a
Alice MineProducern/aLead, Silver, Gold, Copper, Fluorine-Fluoriten/a
ArgoProducern/aUranium, Fluorine-Fluorite, Gold, Silver, Lead, Coppern/a
Big 5Producern/aGold, Silvern/a
BuckhornProducern/aGold, Silver, Leadn/a
CaliforniaProducern/aGold, Silvern/a
CashProducern/aGoldn/a
Copper GlanceProducern/aGold, Coppern/a
Dolly VardenProducern/aGoldn/a
ElectronicProducern/aSilver, Goldn/a
EmmetProducern/aGold, Fluorine-Fluorite, Uraniumn/a
Fallow TunnelProducern/aSilver, Goldn/a
Free CoinageProducern/aGold, Silvern/a
Grand Central - Big BlossomProducern/aGoldn/a
Ingram MineProducern/aGold, Silvern/a
John JayProducern/aGold, Silvern/a
John Jay MineProducern/aGold, Silvern/a
Kekionga-Magnolia VeinProducern/aGold, Tungstenn/a
Lady Franklin MineProducern/aGoldn/a
Little RubyProducern/aSilver, Goldn/a
Logan MineProducern/aGold, Silver, Tungsten, Zinc, Leadn/a
LongfellowProducern/aGold, Silver, Coppern/a
MelvinaProducern/aGoldn/a
Mountain Lion-Keystone VeinProducern/aGoldn/a
NelsonProducern/aGold, Silvern/a
Nugget GroupProducern/aSilver, Lead, Goldn/a
Poorman MineProducern/aGold, Silverfound 1876
Quaker City, Ophir, Pennsylvania, PeewinkProducern/aTungsten, Goldn/a
Senator Hill and Ophir VeinsProducern/aGoldn/a
ShieldsProducern/aGold, Silvern/a
Shirley LodeProducern/aGold, Silvern/a
Slide MineProducern/aGoldn/a
Snowy Range MineProducern/aLead, Goldn/a
UnknownProducern/aGoldn/a
UnknownProducern/aGoldn/a
Virginia, Golden KeyProducern/aGoldn/a
White RavenProducern/aSilver, Lead, Goldn/a
Wild DutchmanProducern/aGold, Silvern/a
Wood Mountain GroupProducern/aGold, Silvern/a
Yellow PineProducern/aGold, Silver, Leadn/a
Caribou Mine (based on DMEA uranium report)Past producern/aZinc, Gold, Lead, Silver, Uraniumfrom 1869
Alton TunnelPast producern/aGold, Silverfrom 1909
ComstockPast producern/aZinc, Silver, Lead, Gold, Copperfrom 1911
Victor MinePast producern/aCopper, Gold, Lead, Silver, Tungsten, Zincfrom 1933
AfterthoughtPast producern/aFluorine-Fluorite, Goldn/a
AlahambraPast producern/aGold, Silvern/a
AlamakeePast producern/aGold, Silvern/a
Alaska TunnelPast producern/aGold, Copper, Lead, Silver, Zincn/a
AlcyonePast producern/aGoldn/a
Alice Open PitPast producern/aLead, Silver, Gold, Copper, Fluorine-Fluoriten/a
Allied Gold Mining CompanyPast producern/aGoldn/a
Alpine HornPast producern/aGold, Silvern/a
AlturasPast producern/aGold, Silvern/a
Amalban ThiefPast producern/aGoldn/a
AmericanPast producern/aGold, Silvern/a
Amy PaulPast producern/aGoldn/a
AnchorPast producern/aGold, Copper, Lead, Silvern/a
ArcherPast producern/aGoldn/a
ArgoPast producern/aFluorine-Fluorite, Gold, Copper, Uranium, Lead, Silvern/a
ArrowheadPast producern/aGoldn/a
Atchison and EldoradoPast producern/aGoldn/a
AtlantaPast producern/aGold, Silvern/a
AtlanticPast producern/aGold, Silvern/a
AudophonePast producern/aGold, Silvern/a
BarkerPast producern/aTungsten, Silver, Goldn/a
BarronPast producern/aGold, Silvern/a
BeaverPast producern/aGoldn/a
BeggarPast producern/aGold, Silvern/a
BelcherPast producern/aSilver, Gold, Lead, Coppern/a
BellPast producern/aGold, Silvern/a
BellePast producern/aGold, Silvern/a
Belle of MemphisPast producern/aGold, Silvern/a
BellvuePast producern/aGold, Silvern/a
BelmontPast producern/aGold, Silvern/a
Ben C. LowellPast producern/aGold, Silvern/a
Big HornPast producern/aGoldn/a
Birds Nest and Village BellePast producern/aGold, Silvern/a
BismarkPast producern/aGold, Silvern/a
Black BearPast producern/aGold, Silvern/a
Black CloudPast producern/aGoldn/a
Black Rose MinePast producern/aGold, Silvern/a
Blue Bird MinePast producern/aCopper, Gold, Zinc, Lead, Silvern/a
Blue RibbonPast producern/aGoldn/a
BondholderPast producern/aGold, Silvern/a
BoodlePast producern/aGold, Silvern/a
BostonPast producern/aGold, Silvern/a
Boulder Gravel ProductsPast producern/aSand and Gravel, Construction, Goldn/a
Boulder MillPast producern/aGold, Silvern/a
Boulder MinePast producern/aGold, Silvern/a
BuckhornPast producern/aGold, Silver, Lead, Copper, Fluorine-Fluoriten/a
Buckskin Joe No 1Past producern/aGold, Copper, Lead, Silver, Zincn/a
BuenaPast producern/aGold, Silver, Copperfound 1879
Buena MinePast producern/aSilver, Gold, Copper, Tungsten, Fluorine-Fluoriten/a
Buena VenturaPast producern/aGold, Silvern/a
CarfieldPast producern/aGoldn/a
Caribou MinePast producern/aGold, Lead, Silver, Uranium, Copper, Zinc, Vanadiumfound 1869
Carl GardnerPast producern/aGold, Silvern/a
CashPast producern/aGold, Silvern/a
CashPast producern/aGold, Silvern/a
Cash MillPast producern/aGold, Silvern/a
CashierPast producern/aGold, Silvern/a
CelestialPast producern/aGold, Silvern/a
ChancellorPast producern/aGold, Silver, Lead, Fluorine-Fluoritefound 1907
Chingis KahnPast producern/aGold, Silvern/a
ClaraPast producern/aGoldn/a
Clara MayPast producern/aGold, Silvern/a
ClevelandPast producern/aGold, Silvern/a
CobaltPast producern/aGoldn/a
Cobalt Gold Mining CoPast producern/aNickel, Goldn/a
Cold Spring and Red CloudPast producern/aGold, Silverfound 1872
Cold Springs MinePast producern/aGold, Silvern/a
ColoradoPast producern/aGold, Silvern/a
Colorado MiraclePast producern/aGold, Silvern/a
ColumbiaPast producern/aGold, Copper, Zinc, Lead, Silvern/a
ColumbusPast producern/aGold, Silvern/a
Copper BlushPast producern/aGold, Silvern/a
CorningPast producern/aGold, Silvern/a
Cross MinePast producern/aZinc, Lead, Silver, Gold, Coppern/a
David MinePast producern/aGold, Silvern/a
David OwenPast producern/aGoldn/a
DecemberPast producern/aGoldn/a
Delaware GroupPast producern/aGold, Silvern/a
DianaPast producern/aGold, Lead, Silver, Zincn/a
DolittlePast producern/aGold, Silvern/a
DollyPast producern/aGold, Silvern/a
Dolly No.OnePast producern/aGold, Silvern/a
Dolly VardenPast producern/aGold, Silvern/a
DossPast producern/aGoldn/a
DunravenPast producern/aGold, Silvern/a
DuriasPast producern/aGold, Silvern/a
E J and R M FordPast producern/aGoldn/a
EarlPast producern/aGold, Silvern/a
East BostonPast producern/aGold, Copper, Silver, Leadn/a
EclipsePast producern/aGold, Silvern/a
Ella CPast producern/aGold, Silvern/a
EllenPast producern/aGold, Silvern/a
EmancipationPast producern/aGold, Silvern/a
EmelyPast producern/aGold, Silvern/a
Empress Mine & Post Boy TunnelPast producern/aGold, Tungstenn/a
Enterprise MinePast producern/aGold, Silvern/a
EquatorPast producern/aGold, Silvern/a
EskimoPast producern/aGold, Silvern/a
EsscoPast producern/aGold, Silvern/a
EurekaPast producern/aGold, Silvern/a
Eureka AltaPast producern/aGold, Silvern/a
EvansPast producern/aGold, Silvern/a
FairfaxPast producern/aGold, Copper, Lead, Silver, Zincn/a
FairmountPast producern/aGoldn/a
Farmer BoyPast producern/aGold, Silvern/a
FiskPast producern/aGoldn/a
Five BrothersPast producern/aGold, Leadn/a
Fools Paradise Number 1 and 2Past producern/aGold, Lead, Silver, Zinc, Coppern/a
FordPast producern/aGold, Tungstenn/a
ForestPast producern/aGold, Silvern/a
FortunePast producern/aGold, Silvern/a
Fourth of JulyPast producern/aGold, Silvern/a
FranklinPast producern/aGold, Silvern/a
Franklin No 5Past producern/aGold, Silvern/a
G and SPast producern/aGold, Silvern/a
George HenryPast producern/aGold, Silvern/a
GilardPast producern/aGold, Silvern/a
Gillaspie and Big JohnPast producern/aGold, Silvern/a
Gina No 1 and 2Past producern/aGold, Sand and Gravel, Constructionn/a
GladiatorPast producern/aGold, Silvern/a
GladysPast producern/aGold, Silvern/a
Glen CloverPast producern/aGold, Silvern/a
Gold CrossPast producern/aGold, Silvern/a
Gold FarmPast producern/aGold, Silvern/a
Gold Hill DistrictPast producern/aSilver, Lead, Zinc, Gold, Telluriumfound 1859
Gold KingPast producern/aGold, Silvern/a
Gold RingPast producern/aGold, Silvern/a
Golden Age MinePast producern/aSilver, Gold, Tellurium, Uraniumfound 1875
Golden BellePast producern/aGold, Silvern/a
Golden ChestPast producern/aGold, Copper, Lead, Silver, Zincn/a
Golden Crown GroupPast producern/aGoldn/a
Golden GlowPast producern/aGold, Silvern/a
Golden RewardPast producern/aGold, Silvern/a
GoldfinchPast producern/aGold, Silvern/a
Goldsmith MaidPast producern/aGold, Lead, Silver, Uranium, Zincn/a
GordovaPast producern/aGoldn/a
Governor GroupPast producern/aGold, Silvern/a
GracePast producern/aGold, Silvern/a
Grand CentralPast producern/aGold, Silvern/a
Grand Island-Caribou DistrictPast producern/aGold, Lead, Silver, Copper, Zinc, Titanium, Uraniumn/a
Grand RepublicPast producern/aGold, Silvern/a
Grand UnionPast producern/aGold, Silvern/a
Grand ViewPast producern/aTungsten, Goldn/a
GrantPast producern/aGold, Silvern/a
Grant CountyPast producern/aGold, Lead, Silvern/a
Graphic MinePast producern/aGold, Tungstenn/a
Gray CopperPast producern/aCopper, Gold, Silvern/a
Great BritainPast producern/aGold, Silvern/a
Great NorthernPast producern/aSilver, Gold, Lead, Uranium, Zincn/a
Great WesternPast producern/aGold, Silvern/a
Grey EaglePast producern/aGold, Silvern/a
GreybackPast producern/aTungsten, Molybdenum, Gold, Silvern/a
GrousePast producern/aGold, Silvern/a
Happy ThoughtPast producern/aGold, Copper, Silvern/a
HawkeyePast producern/aGold, Silvern/a
Helen BPast producern/aGoldn/a
HelenaPast producern/aGold, Silvern/a
HennaPast producern/aGold, Silvern/a
Henry No. 1 & No. 2Past producern/aGold, Copper, Lead, Silver, Zincn/a
HeraldPast producern/aGold, Tungstenn/a
HerculesPast producern/aGold, Quartzn/a
HereafterPast producern/aGold, Silvern/a
Hidden TreasurePast producern/aGold, Silvern/a
Hideaway No 1Past producern/aGold, Tungstenn/a
High GradePast producern/aGoldn/a
High LinePast producern/aGold, Silvern/a
Home Sweet Home and Little JohnnyPast producern/aGold, Silvern/a
HomestakePast producern/aGold, Silvern/a
HoodooPast producern/aGoldn/a
Hopewell and RustyPast producern/aGold, Sand and Gravel, Constructionn/a
Horshoe WorkingsPast producern/aGoldn/a
Humboldt, Sparten, SplendorPast producern/aZinc, Lead, Copper, Fluorine-Fluorite, Gold, Silvern/a
HumbugPast producern/aGold, Silvern/a
HummerPast producern/aTungsten, Gold, Silvern/a
Ideal No TwoPast producern/aGold, Copper, Lead, Silvern/a
IllinoisPast producern/aTungsten, Gold, Silvern/a
IndiaPast producern/aGold, Silvern/a
IngramPast producern/aGold, Silvern/a
InteroceanPast producern/aGold, Silvern/a
InteroceanPast producern/aGold, Silvern/a
InvinciblePast producern/aFluorine-Fluorite, Goldn/a
Iron King TunnelPast producern/aGoldn/a
J AlbinePast producern/aGold, Silver, Zinc, Leadn/a
J O LodePast producern/aGold, Silvern/a
Jake WitterPast producern/aGold, Silvern/a
Jamestown DistrictPast producern/aFluorine-Fluorite, Gold, Uranium, Copper, Lead, Silver, Tungsten, Molybdenum, Telluriumn/a
Jay BirdPast producern/aTungsten, Silver, Goldn/a
Junior ShaftPast producern/aGoldn/a
Kansas CityPast producern/aGold, Silvern/a
KekiongaPast producern/aGold, Silver, Tungstenn/a
KeystonePast producern/aGold, Silvern/a
King GroupPast producern/aGold, Silvern/a
King WilhelmPast producern/aGold, Silvern/a
KlondikePast producern/aGold, Silvern/a
Lady FranklinPast producern/aGold, Silvern/a
Lands EndPast producern/aGold, Silvern/a
Last ChancePast producern/aTungsten, Gold, Silvern/a
LilyPast producern/aGold, Silvern/a
Little AlicePast producern/aGold, Silvern/a
Little JuiePast producern/aGold, Silvern/a
Little MaudPast producern/aGold, Silvern/a
Little MorePast producern/aGold, Silvern/a
Little PittsburgPast producern/aGold, Silvern/a
Little PrincessPast producern/aGoldn/a
LoganPast producern/aTungsten, Lead, Zinc, Gold, Silvern/a
LongfellowPast producern/aCopper, Gold, Silvern/a
Lord ByronPast producern/aGold, Silvern/a
Lost BoyPast producern/aGoldn/a
Lost DutchmanPast producern/aGold, Silver, Leadn/a
Lucky StarPast producern/aGold, Silvern/a
Lulu B Victory + Gold Leaf LodePast producern/aGold, Uraniumn/a
Ma WPast producern/aGold, Silvern/a
MackPast producern/aGoldn/a
MackyPast producern/aGold, Silvern/a
MadredoroPast producern/aGold, Silvern/a
MagnerPast producern/aGold, Silvern/a
MagnoliaPast producern/aGold, Silvern/a
MajesticPast producern/aGold, Lead, Silver, Zincn/a
Mary VPast producern/aGold, Silvern/a
Maude SPast producern/aGold, Silvern/a
May Blossom No 2Past producern/aGold, Silvern/a
Mc Knight PlacerPast producern/aGoldn/a
McKinley-StanleyPast producern/aGold, Silvern/a
MelvinaPast producern/aGold, Silverfound 1875
MilanPast producern/aGold, Silvern/a
MilwaukeePast producern/aGold, Copper, Silvern/a
MissoulaPast producern/aGoldn/a
ModocPast producern/aGold, Copper, Silvern/a
Molly GibsonPast producern/aGold, Silvern/a
Monitor TunnelPast producern/aGoldn/a
MontezumaPast producern/aGoldn/a
Morning GloryPast producern/aGold, Silvern/a
Mountain LionPast producern/aGold, Silvern/a
Mountain PlainsPast producern/aGold, Silvern/a
Mt PleasentPast producern/aLead, Gold, Silvern/a
MyrtlePast producern/aGoldn/a
Mystery GroupPast producern/aGold, Copper, Lead, Silver, Zincn/a
N R APast producern/aGoldn/a
Nancy GroupPast producern/aGold, Silvern/a
National No 2Past producern/aGold, Silvern/a
National TungstenPast producern/aGoldn/a
NederlandPast producern/aGold, Zinc, Lead, Silvern/a
NelsonPast producern/aGoldn/a
NettiePast producern/aGold, Silvern/a
NevcoPast producern/aGold, Lead, Silver, Coppern/a
New BrunswickPast producern/aGold, Silvern/a
New CaliforniaPast producern/aGold, Lead, Silver, Zincn/a
New DiscoveryPast producern/aGold, Silvern/a
New Rival-Black RosePast producern/aGold, Silvern/a
New YearPast producern/aGold, Silvern/a
New York UnionPast producern/aGold, Silvern/a
Ni-WotPast producern/aGold, Copper, Silvern/a
NiagraPast producern/aTungsten, Gold, Silvern/a
Nil DesperandumPast producern/aGold, Silvern/a
Nil Sine NuminePast producern/aGold, Silvern/a
NorwayPast producern/aGold, Silvern/a

Source: USGS Mineral Resources Data System (retrieved 2026-10-13). The database was last updated around 2011, positions can be approximate and "producer" does not mean a mine is operating today. Sites already matched to an MSHA record are shown in the MSHA tables.

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