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Henderson Mine, Dailey Mining District (Jones Pass Mining District), Clear Creek County, Colorado, USAi
| Regional Level Types | |
|---|---|
| Henderson Mine | Mine (Active) |
| Dailey Mining District (Jones Pass Mining District) | Mining District |
| Clear Creek County | County |
| Colorado | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 46' 8'' North , 105° 50' 57'' West
Latitude & Longitude (decimal):
Type:
Mine (Active) - last checked 2018
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Silver Plume | 174 (2017) | 13.3km |
| Empire | 287 (2017) | 14.1km |
| Georgetown | 1,049 (2017) | 14.7km |
| Winter Park | 993 (2017) | 15.5km |
| Saint Marys | 283 (2011) | 18.0km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Colorado Gold Camp | Frisco, Colorado | 30km |
Owned/operated by:
Freeport-McMoRan (100%)
The Henderson ore deposit is located 3000 feet beneath the summit Red Mountain, about 10 miles west of Empire in the Dailey (Jones Pass) district. Access is from U.S. Highway 40 at Berthoud Falls.
The Henderson mine, which has produced molybdenum since 1976 (the deposit was discovered in 1964), is owned by Freeport-McMoRan. It is North America’s largest producer of primary molybdenum source. 2007 production was 40 million pounds of molybdenum.
The Henderson orebody is a blind deposit of about 300 mt (>0.2%) located deeper in the intrusive complex beneath the Urad orebody. Urad produced molybdenum during World War 1 and then again from 1967 to 1974 when the orebody was exhausted.
Both the Urad and Henderson deposits are associated with the Red Mountain Intrusive Center. This is an intrusive complex with more than 20 identifiable pulses of magma. The Henderson orebody was produced from 3 intrusive centers, all of which are hosted within the Urad porphyry. The Henderson - Urad ore deposit is a classic "Climax type" porphyry Mo deposit and many of the genetic characteristics recognized at the Climax mine were applied here from the initial exploration phase onward. The geology is well summarized by Shannon, et al. (2004)
Mining has occurred on 3 levels: 8100, 7700 and 7210. As of 2011 production is solely from the 7210 level.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
38 valid minerals.
Detailed Mineral List:
| ⓘ Aeschynite-(Ce) Formula: Ce(TiNb)O6 |
| ⓘ Aeschynite-(Y) Formula: Y(TiNb)O6 |
| ⓘ Andradite Formula: Ca3Fe3+2(SiO4)3 |
| ⓘ Baryte Formula: BaSO4 |
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ Brannerite Formula: UTi2O6 |
| ⓘ Calcite Formula: CaCO3 References: |
| ⓘ Cassiterite Formula: SnO2 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Chrysoberyl Formula: BeAl2O4 |
| ⓘ Columbite-(Fe) Formula: Fe2+Nb2O6 |
| ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series' |
| ⓘ Columbite-(Mn) Formula: Mn2+Nb2O6 |
| ⓘ Creedite Formula: Ca3Al2(SO4)(OH)2F8 · 2H2O References: |
| ⓘ Ferrimolybdite Formula: Fe2(MoO4)3 · nH2O |
| ⓘ Fluocerite-(Ce) Formula: CeF3 |
| ⓘ Fluorannite Formula: KFe2+3(Si3Al)O10F2 Description: Fluorannite with 0.57-0.51 annite component and 0.596-0.675 F / F + OH were found in Henderson Granite contact with the ore body (Gunow, 1980). |
| ⓘ Fluorapatite Formula: Ca5(PO4)3F |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Fluorophlogopite Formula: KMg3(Si3Al)O10F2 Description: Seven specimens associated with molybdenite, three of which were also associated with fluorite, were analysed with 0.56-0.71 % phlogopite in the octahedral sites with F/F + OH ranging from 0.635-0.858 by Gunow et al. (1980). Fluorophlogopite was found in one sample of the Henderson Granite in contact with the sulphide deposit. |
| ⓘ Galena Formula: PbS |
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 References: |
| ⓘ Gypsum Formula: CaSO4 · 2H2O References: |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Hübnerite Formula: MnWO4 |
| ⓘ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series' |
| ⓘ Jarosite Formula: KFe3+3(SO4)2(OH)6 |
| ⓘ 'K Feldspar' |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ 'Monazite Group' Formula: REE(PO4) |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 Habit: bipyramids in porphry |
| ⓘ Rhodochrosite Formula: MnCO3 Description: Fig. 23 References: |
| ⓘ Rutile Formula: TiO2 |
| ⓘ Rutile var. Ilmenorutile Formula: (Ti,Nb)O2 |
| ⓘ Spessartine Formula: Mn2+3Al2(SiO4)3 |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Thorite Formula: Th(SiO4) |
| ⓘ Topaz Formula: Al2(SiO4)(F,OH)2 |
| ⓘ Uraninite Formula: UO2 |
| ⓘ 'Wolframite Group' |
| ⓘ Xenotime-(Y) Formula: Y(PO4) |
| ⓘ Zircon Formula: Zr(SiO4) |
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| ⓘ | Fluocerite-(Ce) | 3.AC.15 | CeF3 |
| ⓘ | Creedite | 3.CG.15 | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series' | 4.. | |
| ⓘ | Chrysoberyl | 4.BA.05 | BeAl2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| ⓘ | Rutile var. Ilmenorutile | 4.DB.05 | (Ti,Nb)O2 |
| ⓘ | 4.DB.05 | TiO2 | |
| ⓘ | Hübnerite | 4.DB.30 | MnWO4 |
| ⓘ | 'Wolframite Group' | 4.DB.30 va | |
| ⓘ | Columbite-(Fe) | 4.DB.35 | Fe2+Nb2O6 |
| ⓘ | Columbite-(Mn) | 4.DB.35 | Mn2+Nb2O6 |
| ⓘ | Aeschynite-(Ce) | 4.DF.05 | Ce(TiNb)O6 |
| ⓘ | Aeschynite-(Y) | 4.DF.05 | Y(TiNb)O6 |
| ⓘ | Brannerite | 4.DH.05 | UTi2O6 |
| ⓘ | Uraninite | 4.DL.05 | UO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
| ⓘ | Ferrimolybdite | 7.GB.30 | Fe2(MoO4)3 · nH2O |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Xenotime-(Y) | 8.AD.35 | Y(PO4) |
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| ⓘ | Andradite | 9.AD.25 | Ca3Fe3+2(SiO4)3 |
| ⓘ | Spessartine | 9.AD.25 | Mn2+3Al2(SiO4)3 |
| ⓘ | Thorite | 9.AD.30 | Th(SiO4) |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Topaz | 9.AF.35 | Al2(SiO4)(F,OH)2 |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Fluorannite | 9.EC.20 | KFe2+3(Si3Al)O10F2 |
| ⓘ | Fluorophlogopite | 9.EC.20 | KMg3(Si3Al)O10F2 |
| Unclassified | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Monazite Group' | - | REE(PO4) |
| ⓘ | 'Columbite-(Fe)-Columbite-(Mn) Series' | - | |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Creedite | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| H | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| H | ⓘ Gypsum | CaSO4 · 2H2O |
| H | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Be | Beryllium | |
| Be | ⓘ Chrysoberyl | BeAl2O4 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Aeschynite-(Ce) | Ce(TiNb)O6 |
| O | ⓘ Aeschynite-(Y) | Y(TiNb)O6 |
| O | ⓘ Andradite | Ca3Fe23+(SiO4)3 |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Brannerite | UTi2O6 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Cassiterite | SnO2 |
| O | ⓘ Chrysoberyl | BeAl2O4 |
| O | ⓘ Creedite | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| O | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| O | ⓘ Columbite-(Fe) | Fe2+Nb2O6 |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| O | ⓘ Gypsum | CaSO4 · 2H2O |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Hübnerite | MnWO4 |
| O | ⓘ Rutile var. Ilmenorutile | (Ti,Nb)O2 |
| O | ⓘ Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series | |
| O | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| O | ⓘ Columbite-(Mn) | Mn2+Nb2O6 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Monazite Group | REE(PO4) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Rutile | TiO2 |
| O | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| O | ⓘ Thorite | Th(SiO4) |
| O | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| O | ⓘ Uraninite | UO2 |
| O | ⓘ Xenotime-(Y) | Y(PO4) |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| O | ⓘ Fluorannite | KFe32+(Si3Al)O10F2 |
| O | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘ Creedite | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| F | ⓘ Fluocerite-(Ce) | CeF3 |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| F | ⓘ Fluorite | CaF2 |
| F | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| F | ⓘ Fluorannite | KFe32+(Si3Al)O10F2 |
| F | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Al | Aluminium | |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Chrysoberyl | BeAl2O4 |
| Al | ⓘ Creedite | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Al | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Fluorannite | KFe32+(Si3Al)O10F2 |
| Al | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Si | Silicon | |
| Si | ⓘ Andradite | Ca3Fe23+(SiO4)3 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Si | ⓘ Thorite | Th(SiO4) |
| Si | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Si | ⓘ Fluorannite | KFe32+(Si3Al)O10F2 |
| Si | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| P | Phosphorus | |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| P | ⓘ Monazite Group | REE(PO4) |
| P | ⓘ Xenotime-(Y) | Y(PO4) |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Creedite | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| S | ⓘ Galena | PbS |
| S | ⓘ Gypsum | CaSO4 · 2H2O |
| S | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Fluorannite | KFe32+(Si3Al)O10F2 |
| K | ⓘ Fluorophlogopite | KMg3(Si3Al)O10F2 |
| Ca | Calcium | |
| Ca | ⓘ Andradite | Ca3Fe23+(SiO4)3 |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Creedite | Ca3Al2(SO4)(OH)2F8 · 2H2O |
| Ca | ⓘ Fluorapatite | Ca5(PO4)3F |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Gypsum | CaSO4 · 2H2O |
| Ti | Titanium | |
| Ti | ⓘ Aeschynite-(Ce) | Ce(TiNb)O6 |
| Ti | ⓘ Aeschynite-(Y) | Y(TiNb)O6 |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ti | ⓘ Brannerite | UTi2O6 |
| Ti | ⓘ Rutile var. Ilmenorutile | (Ti,Nb)O2 |
| Ti | ⓘ Rutile | TiO2 |
| Mn | Manganese | |
| Mn | ⓘ Hübnerite | MnWO4 |
| Mn | ⓘ Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series | |
| Mn | ⓘ Columbite-(Mn) | Mn2+Nb2O6 |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Mn | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Mn | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Fe | Iron | |
| Fe | ⓘ Andradite | Ca3Fe23+(SiO4)3 |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| Fe | ⓘ Columbite-(Fe) | Fe2+Nb2O6 |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series | |
| Fe | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Fe | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Fe | ⓘ Fluorannite | KFe32+(Si3Al)O10F2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Y | Yttrium | |
| Y | ⓘ Aeschynite-(Y) | Y(TiNb)O6 |
| Y | ⓘ Xenotime-(Y) | Y(PO4) |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
| Nb | Niobium | |
| Nb | ⓘ Aeschynite-(Ce) | Ce(TiNb)O6 |
| Nb | ⓘ Aeschynite-(Y) | Y(TiNb)O6 |
| Nb | ⓘ Columbite-(Fe) | Fe2+Nb2O6 |
| Nb | ⓘ Rutile var. Ilmenorutile | (Ti,Nb)O2 |
| Nb | ⓘ Columbite-(Mn) | Mn2+Nb2O6 |
| Nb | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Mo | Molybdenum | |
| Mo | ⓘ Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| Mo | ⓘ Molybdenite | MoS2 |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| Ce | Cerium | |
| Ce | ⓘ Aeschynite-(Ce) | Ce(TiNb)O6 |
| Ce | ⓘ Fluocerite-(Ce) | CeF3 |
| Ta | Tantalum | |
| Ta | ⓘ Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series | |
| W | Tungsten | |
| W | ⓘ Hübnerite | MnWO4 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
| Th | Thorium | |
| Th | ⓘ Thorite | Th(SiO4) |
| U | Uranium | |
| U | ⓘ Brannerite | UTi2O6 |
| U | ⓘ Uraninite | UO2 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Great Plains DomainDomain
- Southern Rocky MountainsOrogenic Belt
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References
Gunow, A. J., Ludington, Steve, Munoz, J. L. (1980) Fluorine in micas from the Henderson molybdenite deposit, Colorado. Economic Geology, 75 (8) 1127-1137 doi:10.2113/gsecongeo.75.8.1127
Henderson Mine, Dailey Mining District, Clear Creek County, Colorado, USA