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Steward Mine, Butte, Butte Mining District (Summit Valley Mining District), Silver Bow Co., Montana, USAi
Regional Level Types
Steward MineMine
Butte- not defined -
Butte Mining District (Summit Valley Mining District)Mining District
Silver Bow Co.County
MontanaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84):
46° 1' 6'' North , 112° 32' 4'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Butte34,190 (2011)1.6km
Walkerville700 (2017)1.8km
Butte-Silver Bow (Balance)33,525 (2013)16.0km
Warm Springs3,000 (2013)26.5km
Anaconda9,417 (2011)33.7km


Ref.: Rocks & Min.: 16:247.; Ore Deposits at Butte, Montana, R. H. Sales, 1914; Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
NOTE: Most specimans listed as from the Stewart Mine are most likely from the Steward Mine.

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


37 valid minerals.

Detailed Mineral List:

Aikinite
Formula: PbCuBiS3
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Albite
Formula: Na(AlSi3O8)
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Andalusite
Formula: Al2(SiO4)O
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Anhydrite
Formula: CaSO4
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Baryte
Formula: BaSO4
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Betekhtinite
Formula: (Cu,Fe)21Pb2S15
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Bornite
Formula: Cu5FeS4
Description: The Stewart is probably most famous for the bornite and tennatite specimens found there. I have one very interesting specimen consisting of a single needle of betekthinite to 1.5cm included within a translucent, doubly terminated calcite scalenohedron to
Reference: J.A. Lorengo collection; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Calcite
Formula: CaCO3
Description: The Stewart is probably most famous for the bornite and tennatite specimens found there. I have one very interesting specimen consisting of a single needle of betekthinite to 1.5cm included within a translucent, doubly terminated calcite scalenohedron to
Reference: J.A. Lorengo collection
Chalcocite
Formula: Cu2S
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcopyrite
Formula: CuFeS2
Reference: J.A. Lorengo collection; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Chlorite Group'
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Colusite
Formula: Cu13VAs3S16
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Corundum
Formula: Al2O3
Reference: Berg, R.B. 2007 "Sapphires in the Butte-Deer Lodge Area, Montana" Montana Bureau of Mines and Geology, Bull. 134
Corundum var: Sapphire
Formula: Al2O3
Reference: Berg, R.B. 2007 "Sapphires in the Butte-Deer Lodge Area, Montana" Montana Bureau of Mines and Geology, Bull. 134
Covellite
Formula: CuS
Reference: No reference listed
Digenite
Formula: Cu9S5
Reference: No reference listed
Dolomite
Formula: CaMg(CO3)2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Enargite
Formula: Cu3AsS4
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Fluorite
Formula: CaF2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Galena
Formula: PbS
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Hübnerite
Formula: MnWO4
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Molybdenite
Formula: MoS2
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Orthoclase
Formula: K(AlSi3O8)
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Pyrite
Formula: FeS2
Description: The Stewart is probably most famous for the bornite and tennatite specimens found there. I have one very interesting specimen consisting of a single needle of betekthinite to 1.5cm included within a translucent, doubly terminated calcite scalenohedron to
Reference: J.A. Lorengo collection; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Description: The Stewart is probably most famous for the bornite and tennatite specimens found there. I have one very interesting specimen consisting of a single needle of betekthinite to 1.5cm included within a translucent, doubly terminated calcite scalenohedron to
Reference: J.A. Lorengo collection; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Rhodochrosite
Formula: MnCO3
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Scheelite
Formula: Ca(WO4)
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Siderite
Formula: FeCO3
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Silver
Formula: Ag
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Sphalerite
Formula: ZnS
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Stromeyerite
Formula: AgCuS
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Tennantite
Formula: Cu6[Cu4(Fe,Zn)2]As4S13
Description: The Stewart is probably most famous for the bornite and tennatite specimens found there. I have one very interesting specimen consisting of a single needle of betekthinite to 1.5cm included within a translucent, doubly terminated calcite scalenohedron to
Reference: J.A. Lorengo collection; Rocks & Min.: 16: 247.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Titanite
Formula: CaTi(SiO4)O
Reference: Guidebook for the Butte Field Meeting of the Society Of Economic Geologists, 1973
Uraninite ?
Formula: UO2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964
Wittichenite
Formula: Cu3BiS3
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen 1964

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Aikinite2.HB.05aPbCuBiS3
Betekhtinite2.BE.05(Cu,Fe)21Pb2S15
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Colusite2.CB.30Cu13VAs3S16
Covellite2.CA.05aCuS
Digenite2.BA.10Cu9S5
Enargite2.KA.05Cu3AsS4
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Stromeyerite2.BA.40AgCuS
Tennantite2.GB.05Cu6[Cu4(Fe,Zn)2]As4S13
Tetrahedrite2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Wittichenite2.GA.20Cu3BiS3
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
var: Sapphire4.CB.05Al2O3
Hübnerite4.DB.30MnWO4
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Uraninite ?4.DL.05UO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Rhodochrosite5.AB.05MnCO3
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Baryte7.AD.35BaSO4
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Andalusite9.AF.10Al2(SiO4)O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Titanite9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
Digenite2.4.7.3Cu9S5
Stromeyerite2.4.6.1AgCuS
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Miscellaneous
Betekhtinite2.16.8.1(Cu,Fe)21Pb2S15
Group 3 - SULFOSALTS
ø > 4
Colusite3.1.1.1Cu13VAs3S16
ø = 4
Enargite3.2.1.1Cu3AsS4
3 <ø < 4
Tennantite3.3.6.2Cu6[Cu4(Fe,Zn)2]As4S13
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
ø = 3
Aikinite3.4.5.1PbCuBiS3
Wittichenite3.4.8.1Cu3BiS3
Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite ?5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Rhodochrosite14.1.1.4MnCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
Baryte28.3.1.1BaSO4
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Hübnerite48.1.1.1MnWO4
Scheelite48.1.2.1Ca(WO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Andalusite52.2.2b.1Al2(SiO4)O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Chlorite Group'-
Corundum
var: Sapphire
-Al2O3
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H ApatiteCa5(PO4)3(Cl/F/OH)
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C AnkeriteCa(Fe2+,Mg)(CO3)2
C RhodochrositeMnCO3
C SideriteFeCO3
OOxygen
O CalciteCaCO3
O QuartzSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O HübneriteMnWO4
O ScheeliteCa(WO4)
O ApatiteCa5(PO4)3(Cl/F/OH)
O BaryteBaSO4
O DolomiteCaMg(CO3)2
O AnkeriteCa(Fe2+,Mg)(CO3)2
O RhodochrositeMnCO3
O OrthoclaseK(AlSi3O8)
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O MagnetiteFe2+Fe23+O4
O AnhydriteCaSO4
O SideriteFeCO3
O AndalusiteAl2(SiO4)O
O TitaniteCaTi(SiO4)O
O CorundumAl2O3
O Corundum (var: Sapphire)Al2O3
O MuscoviteKAl2(AlSi3O10)(OH)2
O AlbiteNa(AlSi3O8)
O UraniniteUO2
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
F FluoriteCaF2
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg DolomiteCaMg(CO3)2
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al OrthoclaseK(AlSi3O8)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al AndalusiteAl2(SiO4)O
Al CorundumAl2O3
Al Corundum (var: Sapphire)Al2O3
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al AlbiteNa(AlSi3O8)
SiSilicon
Si QuartzSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si OrthoclaseK(AlSi3O8)
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si AndalusiteAl2(SiO4)O
Si TitaniteCaTi(SiO4)O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si AlbiteNa(AlSi3O8)
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
S ColusiteCu13VAs3S16
S BorniteCu5FeS4
S TennantiteCu6[Cu4(Fe,Zn)2]As4S13
S PyriteFeS2
S Betekhtinite(Cu,Fe)21Pb2S15
S ChalcopyriteCuFeS2
S CovelliteCuS
S DigeniteCu9S5
S ChalcociteCu2S
S EnargiteCu3AsS4
S SphaleriteZnS
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
S GalenaPbS
S WitticheniteCu3BiS3
S BaryteBaSO4
S StromeyeriteAgCuS
S AikinitePbCuBiS3
S MolybdeniteMoS2
S AnhydriteCaSO4
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K OrthoclaseK(AlSi3O8)
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca ScheeliteCa(WO4)
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca FluoriteCaF2
Ca DolomiteCaMg(CO3)2
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca AnhydriteCaSO4
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti TitaniteCaTi(SiO4)O
VVanadium
V ColusiteCu13VAs3S16
MnManganese
Mn HübneriteMnWO4
Mn RhodochrositeMnCO3
FeIron
Fe BorniteCu5FeS4
Fe PyriteFeS2
Fe Betekhtinite(Cu,Fe)21Pb2S15
Fe ChalcopyriteCuFeS2
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe MagnetiteFe2+Fe23+O4
Fe SideriteFeCO3
CuCopper
Cu ColusiteCu13VAs3S16
Cu BorniteCu5FeS4
Cu TennantiteCu6[Cu4(Fe,Zn)2]As4S13
Cu Betekhtinite(Cu,Fe)21Pb2S15
Cu ChalcopyriteCuFeS2
Cu CovelliteCuS
Cu DigeniteCu9S5
Cu ChalcociteCu2S
Cu EnargiteCu3AsS4
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
Cu WitticheniteCu3BiS3
Cu StromeyeriteAgCuS
Cu AikinitePbCuBiS3
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
AsArsenic
As ColusiteCu13VAs3S16
As TennantiteCu6[Cu4(Fe,Zn)2]As4S13
As EnargiteCu3AsS4
MoMolybdenum
Mo MolybdeniteMoS2
AgSilver
Ag StromeyeriteAgCuS
Ag SilverAg
SbAntimony
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
BaBarium
Ba BaryteBaSO4
WTungsten
W HübneriteMnWO4
W ScheeliteCa(WO4)
PbLead
Pb Betekhtinite(Cu,Fe)21Pb2S15
Pb GalenaPbS
Pb AikinitePbCuBiS3
BiBismuth
Bi WitticheniteCu3BiS3
Bi AikinitePbCuBiS3
UUranium
U UraniniteUO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cretaceous
66 - 145 Ma



ID: 2113917
Biotite-hornblende granodioritic rocks along the Continental Divide, Anaconda Range, Sapphire Mountains, and Flint Creek Range

Age: Cretaceous (66 - 145 Ma)

Lithology: Major:: {biotite-hornblende granodiorite, biotite-hornblende monzogranite, tonalite}

Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0. [25]

Cretaceous
66 - 145 Ma



ID: 3187684
Mesozoic intrusive rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cretaceous
66 - 145 Ma



ID: 2984479
Granitic rock

Age: Cretaceous (66 - 145 Ma)

Comments: Original map source: Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract betwe

Lithology: Major:{granitic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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