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Boulder Batholith, Jefferson County, Montana, USAi
| Regional Level Types | |
|---|---|
| Boulder Batholith | Batholith |
| Jefferson County | County |
| Montana | State |
| USA | Country |
This page kindly sponsored by Paul Senn
Latitude & Longitude (WGS84):
46° North , 112° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~53km
Type:
Köppen climate type:
A relatively small granitic batholith at 75 miles (121 km) N-S by 25 miles (40 km) E-W, that lies roughly between Butte and Helena, and between the Deer Lodge (Upper Clark Fork) Valley and the Broadwater (Upper Missouri) Valley. The volcanic Elkhorn Mountains are associated with the batholith. The structure was named for the prominent rounded boulders that typify its landscape, the result of spheroidal weathering of fractured granite.
The boulder batholith is a large intrusive body composed mainly of quartz monzonite and is cut by plugs and dikes of alaskite and dacite. It is composed of 14 known pluton units including satellite plutons
Pegmatites of the boulder batholith occur in irregular bodies, lenses, dikes, and miarolitic cavities from one area to another. They occur as both exterior type (melts moving through already cooled rock), and interior type (melts cooling with surrounding granite). Largely, the pegmatites of the region carry extreme variety and complexity, especially in quartz variations. Gem species are overall quite rare, however. One of the unique diversities in boulder batholith pegmatites is the abundance of calcium minerals, such as titanite and epidote. Acicular sprays of epidote can be found in abundance throughout the Homestake pluton. There is as well an abundance of schorl tourmaline, some of which has been found to form in series with dravite, displaying orange, green, and yellow coloration.
The boulder batholith is a large intrusive body composed mainly of quartz monzonite and is cut by plugs and dikes of alaskite and dacite. It is composed of 14 known pluton units including satellite plutons
Pegmatites of the boulder batholith occur in irregular bodies, lenses, dikes, and miarolitic cavities from one area to another. They occur as both exterior type (melts moving through already cooled rock), and interior type (melts cooling with surrounding granite). Largely, the pegmatites of the region carry extreme variety and complexity, especially in quartz variations. Gem species are overall quite rare, however. One of the unique diversities in boulder batholith pegmatites is the abundance of calcium minerals, such as titanite and epidote. Acicular sprays of epidote can be found in abundance throughout the Homestake pluton. There is as well an abundance of schorl tourmaline, some of which has been found to form in series with dravite, displaying orange, green, and yellow coloration.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded from this region.Mineral List
Mineral list contains entries from the region specified including sub-localities65 valid minerals.
Rock Types Recorded
Rock list contains entries from the region specified including sub-localities
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Acanthite Formula: Ag2S References: |
| ⓘ Actinolite ? Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 References: |
| ⓘ Albite Formula: Na(AlSi3O8) Localities: Reported from at least 14 localities in this region. |
| ⓘ Albite var. Cleavelandite Formula: Na(AlSi3O8) |
| ⓘ 'Allanite Group' Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) Localities: Reported from at least 6 localities in this region. |
| ⓘ Anatase Formula: TiO2 Localities: Foolhen #2 pegmatite, Goldflint Mountain, Boulder Batholith, Jefferson County, Montana, USA Pohndorf Mine, Toll Mountain, Boulder Batholith, Jefferson County, Montana, USA Homestake Pass, Boulder Batholith, Jefferson County, Montana, USA Little Gem Mine, Boulder Batholith, Jefferson County, Montana, USA Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ Anorthite Formula: Ca(Al2Si2O8) References: |
| ⓘ 'Apatite' Formula: Ca5(PO4)3A |
| ⓘ 'Apophyllite Group' Formula: AB4[Si8O20]X · 8H2O References: |
| ⓘ Arsenopyrite Formula: FeAsS References: |
| ⓘ Astrophyllite Formula: K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| ⓘ Autunite Formula: Ca(UO2)2(PO4)2 · 10-12H2O References: |
| ⓘ Axinite-(Fe) Formula: Ca2Fe2+Al2BSi4O15OH |
| ⓘ 'Axinite Group' References: |
| ⓘ Baryte Formula: BaSO4 References: |
| ⓘ Bertrandite Formula: Be4(Si2O7)(OH)2 |
| ⓘ Beryl Formula: Be3Al2(Si6O18) |
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ Brookite Formula: TiO2 |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ 'Chabazite' References: |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chalcopyrite Formula: CuFeS2 Localities: Free Enterprise Mine (Silver Bell), Boulder, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA Baltimore Mine, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA Nickelodeon occurrence, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ Cinnabar Formula: HgS |
| ⓘ 'Clinoptilolite Subgroup' Formula: (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O References: |
| ⓘ Clinozoisite Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) Colour: yellow/yellow green, yellow pink Description: Known in the calcium rich granitic pegmatites of the boulder batholith as well as skarns. Specifically isolated to pegmatites on eastern boundaries of batholith near skarn zones. Very rare.
Documented skarns by Dr. Richard Gibson (https://richardigibson.substack.com/p/the-edge-of-the-boulder-batholith) as well as Dr. Pete Knudsen/others at Crazy Sphinx Locality. Very rare at both skarn localities. References: Paul Senn CollectionIdentification: Visual Identification |
| ⓘ Cosalite Formula: Pb2Bi2S5 |
| ⓘ Danburite Formula: CaB2Si2O8 |
| ⓘ Diopside Formula: CaMgSi2O6 |
| ⓘ Dravite Formula: NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) References: Paul Senn Field Work/ResearchIdentified by Paul Senn: XRF |
| ⓘ 'Dravite-Schorl Series' References: |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) Localities: Little Gem Mine, Boulder Batholith, Jefferson County, Montana, USA Beehive #3 pegmatite, Goldflint Mountain, Boulder Batholith, Jefferson County, Montana, USA Marcus Pruett's feldspar claim, Boulder Batholith, Jefferson County, Montana, USA Homestake Pass, Boulder Batholith, Jefferson County, Montana, USA Delmoe Lake area, Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ 'Feldspar Group' |
| ⓘ Fluorapatite Formula: Ca5(PO4)3F References: |
| ⓘ Fluorite Formula: CaF2 References: |
| ⓘ Galena Formula: PbS Localities: Free Enterprise Mine (Silver Bell), Boulder, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA Molly McGregor Mine (Emma Bell Adolphus), Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA Baltimore Mine, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 |
| ⓘ Goethite Formula: Fe3+O(OH) |
| ⓘ Grossular Formula: Ca3Al2(SiO4)3 |
| ⓘ 'Gummite' References: |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ Kaolinite Formula: Al2(Si2O5)(OH)4 References: |
| ⓘ 'K Feldspar' |
| ⓘ Laumontite Formula: CaAl2Si4O12 · 4H2O References: |
| ⓘ Lepidocrocite Formula: Fe3+O(OH) References: |
| ⓘ 'Limonite' |
| ⓘ Magnesio-hornblende Formula: ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 References: |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 References: |
| ⓘ Metatorbernite Formula: Cu(UO2)2(PO4)2 · 8H2O References: |
| ⓘ Microcline Formula: K(AlSi3O8) Localities: Reported from at least 11 localities in this region. |
| ⓘ Molybdenite Formula: MoS2 Localities: Free Enterprise Mine (Silver Bell), Boulder, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA Nickelodeon occurrence, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA Rootbeer pegmatite, Delmoe Lake area, Boulder Batholith, Jefferson County, Montana, USA Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ 'Monazite Group' Formula: REE(PO4) |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Localities: Reported from at least 10 localities in this region. |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 Localities: Pohndorf Mine, Toll Mountain, Boulder Batholith, Jefferson County, Montana, USA Little Gem Mine, Boulder Batholith, Jefferson County, Montana, USA Battlestar Mine, Homestake Mining District, Boulder Batholith, Jefferson County, Montana, USA Delmoe Lake area, Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ Native Gold Formula: Au Localities: Reported from at least 7 localities in this region. |
| ⓘ Native Silver Formula: Ag References: |
| ⓘ 'Onegite' |
| ⓘ Opal Formula: SiO2 · nH2O References: |
| ⓘ Opal var. Hyalite Formula: SiO2 · nH2O References: |
| ⓘ Orthoclase Formula: K(AlSi3O8) References: |
| ⓘ Phenakite Formula: Be2SiO4 References: |
| ⓘ Powellite Formula: Ca(MoO4) |
| ⓘ Prehnite Formula: Ca2Al2Si3O10(OH)2 References: |
| ⓘ Pyrargyrite Formula: Ag3SbS3 References: |
| ⓘ Pyrite Formula: FeS2 Localities: Reported from at least 6 localities in this region. |
| ⓘ Quartz Formula: SiO2 Localities: Reported from at least 20 localities in this region. Habit: Hexagonal Colour: Black Description: Morion (Smokey) Quartz, deep black hexagonal crystals |
| ⓘ Quartz var. Amethyst Formula: SiO2 Localities: Reported from at least 10 localities in this region. |
| ⓘ Quartz var. Milky Quartz Formula: SiO2 |
| ⓘ Quartz var. Sceptre Quartz Formula: SiO2 Localities: Beehive #2 Pegmatite, Goldflint Mountain, Boulder Batholith, Jefferson County, Montana, USA Little Gem Mine, Boulder Batholith, Jefferson County, Montana, USA Battlestar Mine, Homestake Mining District, Boulder Batholith, Jefferson County, Montana, USA Delmoe Lake area, Boulder Batholith, Jefferson County, Montana, USA |
| ⓘ Quartz var. Smoky Quartz Formula: SiO2 Localities: Reported from at least 13 localities in this region. |
| ⓘ Rutile Formula: TiO2 Localities: |
| ⓘ Samarskite-(Y) Formula: YFe3+Nb2O8 References: |
| ⓘ Scheelite Formula: Ca(WO4) |
| ⓘ Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) Localities: Reported from at least 8 localities in this region. |
| ⓘ Spessartine Formula: Mn2+3Al2(SiO4)3 |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Spinel Formula: MgAl2O4 References: |
| ⓘ Tenorite Formula: CuO |
| ⓘ Titanite Formula: CaTiO(SiO4) Localities: Reported from at least 7 localities in this region. |
| ⓘ Topaz Formula: Al2(SiO4)(F,OH)2 Localities: Habit: Orthorhombic Colour: Gold, Yellow, Clear Description: Light Golden colored, Well formed Topaz Crystal |
| ⓘ 'Tourmaline' Formula: AD3G6(T6O18)(BO3)3X3Z |
| ⓘ Uraninite Formula: UO2 References: |
| ⓘ Uranophane Formula: Ca(UO2)2(SiO3OH)2 · 5H2O References: |
| ⓘ Vesuvianite Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| ⓘ Zeunerite Formula: Cu(UO2)2(AsO4)2 · 12H2O References: |
| ⓘ Zircon Formula: Zr(SiO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| ⓘ | Native Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Acanthite | 2.BA.35 | Ag2S |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | Pyrargyrite | 2.GA.05 | Ag3SbS3 |
| ⓘ | Cosalite | 2.JB.10 | Pb2Bi2S5 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Tenorite | 4.AB.10 | CuO |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Quartz var. Amethyst | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | var. Smoky Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Milky Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Sceptre Quartz | 4.DA.05 | SiO2 |
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| ⓘ | var. Hyalite | 4.DA.10 | SiO2 · nH2O |
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| ⓘ | Samarskite-(Y) | 4.DB.25 | YFe3+Nb2O8 |
| ⓘ | Anatase | 4.DD.05 | TiO2 |
| ⓘ | Brookite | 4.DD.10 | TiO2 |
| ⓘ | Uraninite | 4.DL.05 | UO2 |
| ⓘ | Lepidocrocite | 4.FE.15 | Fe3+O(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Powellite | 7.GA.05 | Ca(MoO4) |
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| ⓘ | Autunite | 8.EB.05 | Ca(UO2)2(PO4)2 · 10-12H2O |
| ⓘ | Zeunerite | 8.EB.05 | Cu(UO2)2(AsO4)2 · 12H2O |
| ⓘ | Metatorbernite | 8.EB.10 | Cu(UO2)2(PO4)2 · 8H2O |
| Group 9 - Silicates | |||
| ⓘ | Phenakite | 9.AA.05 | Be2SiO4 |
| ⓘ | Grossular | 9.AD.25 | Ca3Al2(SiO4)3 |
| ⓘ | Spessartine | 9.AD.25 | Mn2+3Al2(SiO4)3 |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Topaz | 9.AF.35 | Al2(SiO4)(F,OH)2 |
| ⓘ | Titanite | 9.AG.15 | CaTiO(SiO4) |
| ⓘ | Uranophane | 9.AK.15 | Ca(UO2)2(SiO3OH)2 · 5H2O |
| ⓘ | Bertrandite | 9.BD.05 | Be4(Si2O7)(OH)2 |
| ⓘ | Axinite-(Fe) | 9.BD.20 | Ca2Fe2+Al2BSi4O15OH |
| ⓘ | Clinozoisite | 9.BG.05a | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Vesuvianite | 9.BG.35 | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| ⓘ | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Dravite | 9.CK.05 | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
| ⓘ | Astrophyllite | 9.DC.05 | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| ⓘ | Actinolite ? | 9.DE.10 | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| ⓘ | Magnesio-hornblende | 9.DE.10 | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| ⓘ | Prehnite | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Orthoclase | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Anorthite | 9.FA.35 | Ca(Al2Si2O8) |
| ⓘ | Albite var. Cleavelandite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Danburite | 9.FA.65 | CaB2Si2O8 |
| ⓘ | Laumontite | 9.GB.10 | CaAl2Si4O12 · 4H2O |
| Unclassified | |||
| ⓘ | 'Apophyllite Group' | - | AB4[Si8O20]X · 8H2O |
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Chabazite' | - | |
| ⓘ | 'Clinoptilolite Subgroup' | - | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Gummite' | - | |
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Monazite Group' | - | REE(PO4) |
| ⓘ | 'Onegite' | - | |
| ⓘ | 'Tourmaline' | - | AD3G6(T6O18)(BO3)3X3Z |
| ⓘ | 'Dravite-Schorl Series' | - | |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
| ⓘ | 'Apatite' | - | Ca5(PO4)3A |
| ⓘ | 'Axinite Group' | - | |
| ⓘ | 'Allanite Group' | - | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| H | ⓘ Apophyllite Group | AB4[Si8O20]X · 8H2O |
| H | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| H | ⓘ Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| H | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| H | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| H | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| H | ⓘ Goethite | Fe3+O(OH) |
| H | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| H | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| H | ⓘ Lepidocrocite | Fe3+O(OH) |
| H | ⓘ Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| H | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Opal | SiO2 · nH2O |
| H | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| H | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| H | ⓘ Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| H | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| H | ⓘ Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| H | ⓘ Dravite-Schorl Series | |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Opal var. Hyalite | SiO2 · nH2O |
| H | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| Be | Beryllium | |
| Be | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| Be | ⓘ Beryl | Be3Al2(Si6O18) |
| Be | ⓘ Phenakite | Be2SiO4 |
| B | Boron | |
| B | ⓘ Danburite | CaB2Si2O8 |
| B | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| B | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| B | ⓘ Dravite-Schorl Series | |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Quartz var. Amethyst | SiO2 |
| O | ⓘ Anatase | TiO2 |
| O | ⓘ Anorthite | Ca(Al2Si2O8) |
| O | ⓘ Apophyllite Group | AB4[Si8O20]X · 8H2O |
| O | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| O | ⓘ Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Brookite | TiO2 |
| O | ⓘ Beryl | Be3Al2(Si6O18) |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| O | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| O | ⓘ Danburite | CaB2Si2O8 |
| O | ⓘ Diopside | CaMgSi2O6 |
| O | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Grossular | Ca3Al2(SiO4)3 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| O | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| O | ⓘ Lepidocrocite | Fe3+O(OH) |
| O | ⓘ Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Monazite Group | REE(PO4) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Opal | SiO2 · nH2O |
| O | ⓘ Orthoclase | K(AlSi3O8) |
| O | ⓘ Phenakite | Be2SiO4 |
| O | ⓘ Powellite | Ca(MoO4) |
| O | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rutile | TiO2 |
| O | ⓘ Samarskite-(Y) | YFe3+Nb2O8 |
| O | ⓘ Scheelite | Ca(WO4) |
| O | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Quartz var. Smoky Quartz | SiO2 |
| O | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| O | ⓘ Spinel | MgAl2O4 |
| O | ⓘ Tenorite | CuO |
| O | ⓘ Titanite | CaTiO(SiO4) |
| O | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| O | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| O | ⓘ Uraninite | UO2 |
| O | ⓘ Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| O | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| O | ⓘ Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Quartz var. Milky Quartz | SiO2 |
| O | ⓘ Quartz var. Sceptre Quartz | SiO2 |
| O | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| O | ⓘ Dravite-Schorl Series | |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| O | ⓘ Apatite | Ca5(PO4)3A |
| O | ⓘ Opal var. Hyalite | SiO2 · nH2O |
| O | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| F | Fluorine | |
| F | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| F | ⓘ Fluorite | CaF2 |
| F | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Na | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| Na | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| Na | ⓘ Dravite-Schorl Series | |
| Mg | Magnesium | |
| Mg | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | ⓘ Diopside | CaMgSi2O6 |
| Mg | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| Mg | ⓘ Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| Mg | ⓘ Spinel | MgAl2O4 |
| Mg | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Mg | ⓘ Dravite-Schorl Series | |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Anorthite | Ca(Al2Si2O8) |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Beryl | Be3Al2(Si6O18) |
| Al | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| Al | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Al | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Al | ⓘ Grossular | Ca3Al2(SiO4)3 |
| Al | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Al | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Al | ⓘ Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Orthoclase | K(AlSi3O8) |
| Al | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Al | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Al | ⓘ Spinel | MgAl2O4 |
| Al | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Al | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Al | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| Al | ⓘ Dravite-Schorl Series | |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Quartz var. Amethyst | SiO2 |
| Si | ⓘ Anorthite | Ca(Al2Si2O8) |
| Si | ⓘ Apophyllite Group | AB4[Si8O20]X · 8H2O |
| Si | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Si | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Beryl | Be3Al2(Si6O18) |
| Si | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| Si | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Si | ⓘ Danburite | CaB2Si2O8 |
| Si | ⓘ Diopside | CaMgSi2O6 |
| Si | ⓘ Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Si | ⓘ Grossular | Ca3Al2(SiO4)3 |
| Si | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Si | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Si | ⓘ Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Opal | SiO2 · nH2O |
| Si | ⓘ Orthoclase | K(AlSi3O8) |
| Si | ⓘ Phenakite | Be2SiO4 |
| Si | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Quartz var. Smoky Quartz | SiO2 |
| Si | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Si | ⓘ Titanite | CaTiO(SiO4) |
| Si | ⓘ Topaz | Al2(SiO4)(F,OH)2 |
| Si | ⓘ Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| Si | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Quartz var. Milky Quartz | SiO2 |
| Si | ⓘ Quartz var. Sceptre Quartz | SiO2 |
| Si | ⓘ Albite var. Cleavelandite | Na(AlSi3O8) |
| Si | ⓘ Dravite-Schorl Series | |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Si | ⓘ Opal var. Hyalite | SiO2 · nH2O |
| Si | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| P | Phosphorus | |
| P | ⓘ Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| P | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| P | ⓘ Monazite Group | REE(PO4) |
| P | ⓘ Apatite | Ca5(PO4)3A |
| S | Sulfur | |
| S | ⓘ Acanthite | Ag2S |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcocite | Cu2S |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Cosalite | Pb2Bi2S5 |
| S | ⓘ Galena | PbS |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrargyrite | Ag3SbS3 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Orthoclase | K(AlSi3O8) |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Ca | ⓘ Anorthite | Ca(Al2Si2O8) |
| Ca | ⓘ Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| Ca | ⓘ Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Danburite | CaB2Si2O8 |
| Ca | ⓘ Diopside | CaMgSi2O6 |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Ca | ⓘ Fluorapatite | Ca5(PO4)3F |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Grossular | Ca3Al2(SiO4)3 |
| Ca | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Ca | ⓘ Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| Ca | ⓘ Powellite | Ca(MoO4) |
| Ca | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Ca | ⓘ Titanite | CaTiO(SiO4) |
| Ca | ⓘ Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| Ca | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Ca | ⓘ Apatite | Ca5(PO4)3A |
| Ti | Titanium | |
| Ti | ⓘ Anatase | TiO2 |
| Ti | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ti | ⓘ Brookite | TiO2 |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Ti | ⓘ Rutile | TiO2 |
| Ti | ⓘ Titanite | CaTiO(SiO4) |
| Mn | Manganese | |
| Mn | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Fe | Iron | |
| Fe | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Lepidocrocite | Fe3+O(OH) |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Samarskite-(Y) | YFe3+Nb2O8 |
| Fe | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Fe | ⓘ Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| Fe | ⓘ Dravite-Schorl Series | |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Cu | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| Cu | ⓘ Tenorite | CuO |
| Cu | ⓘ Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| As | ⓘ Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| Y | Yttrium | |
| Y | ⓘ Samarskite-(Y) | YFe3+Nb2O8 |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
| Nb | Niobium | |
| Nb | ⓘ Samarskite-(Y) | YFe3+Nb2O8 |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Mo | ⓘ Powellite | Ca(MoO4) |
| Ag | Silver | |
| Ag | ⓘ Acanthite | Ag2S |
| Ag | ⓘ Pyrargyrite | Ag3SbS3 |
| Ag | ⓘ Native Silver | Ag |
| Sb | Antimony | |
| Sb | ⓘ Pyrargyrite | Ag3SbS3 |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
| Pb | Lead | |
| Pb | ⓘ Cosalite | Pb2Bi2S5 |
| Pb | ⓘ Galena | PbS |
| Bi | Bismuth | |
| Bi | ⓘ Cosalite | Pb2Bi2S5 |
| U | Uranium | |
| U | ⓘ Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| U | ⓘ Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| U | ⓘ Uraninite | UO2 |
| U | ⓘ Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| U | ⓘ Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
Localities in this Region
- Montana
- Jefferson County
- Boulder Batholith
- Bald Mountain
- Best Wish placer
- Boulder Iron Mine (Boulder Deposit)
- ⭔Boulder Mining District
- Boulder Batholith
- Jefferson County
- Montana
- Jefferson County
- Boulder Batholith
- Boulder Mining District
- ⭔Delmoe Lake area
- Goldflint Mountain
- Homestake Mining District
- Homestake Pass
- Little Gem Mine
- Little Pipestone Creek
- Marcus Pruett's feldspar claim
- Rader Creek
- Toll Mountain
- Wissikihon Creek
- Boulder Batholith
- Jefferson County
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Great Falls DomainDomain
- Northern Rocky MountainsWide Rift
USA
- Montana
- Beaverhead–Deerlodge National ForestNational Forest
- Western Phosphate fieldMineral Province
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References
Boulder Batholith, Jefferson County, Montana, USA