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

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Latitude & Longitude (WGS84): 46° 1' 38'' North , 112° 31' 31'' West
Latitude & Longitude (decimal): 46.02722,-112.52528
GeoHash:G#: c2pvz7j84
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Walkerville700 (2017)1.1km
Butte34,190 (2011)2.7km
Butte-Silver Bow (Balance)33,525 (2013)17.2km
Warm Springs3,000 (2013)26.3km
Basin212 (2011)33.8km


Ref.: Dana 6:A1:20; Amer.Jour.Sci.:7:56(1899).
Ref: Geology and Ore Deposits of the Butte District, Montana; W. Weed 1912

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


18 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Baryte
Formula: BaSO4
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Bornite
Formula: Cu5FeS4
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.
Calcite
Formula: CaCO3
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Chalcocite
Formula: Cu2S
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.
Chalcopyrite
Formula: CuFeS2
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.
Covellite
Formula: CuS
Reference: Dana 6:A1:20; Amer.Jour.Sci.:7:56(1899).; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Enargite
Formula: Cu3AsS4
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.
Fluorite
Formula: CaF2
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Galena
Formula: PbS
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Hübnerite
Formula: MnWO4
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Pyrite
Formula: FeS2
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.
Quartz
Formula: SiO2
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.
Rhodochrosite
Formula: MnCO3
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Silver
Formula: Ag
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
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.
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Enargite2.KA.05Cu3AsS4
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Tetrahedrite2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hübnerite4.DB.30MnWO4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Rhodochrosite5.AB.05MnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2

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
Acanthite2.4.1.1Ag2S
Chalcocite2.4.7.1Cu2S
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
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 4
Enargite3.2.1.1Cu3AsS4
3 <ø < 4
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Rhodochrosite14.1.1.4MnCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Hübnerite48.1.1.1MnWO4
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
Unclassified Minerals, Mixtures, etc.
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C RhodochrositeMnCO3
C CalciteCaCO3
OOxygen
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O QuartzSiO2
O RhodochrositeMnCO3
O BaryteBaSO4
O CalciteCaCO3
O HübneriteMnWO4
O MuscoviteKAl2(AlSi3O10)(OH)2
FFluorine
F FluoriteCaF2
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S CovelliteCuS
S PyriteFeS2
S EnargiteCu3AsS4
S ChalcociteCu2S
S BorniteCu5FeS4
S SphaleriteZnS
S ChalcopyriteCuFeS2
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
S GalenaPbS
S BaryteBaSO4
S AcanthiteAg2S
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluoriteCaF2
Ca CalciteCaCO3
MnManganese
Mn RhodochrositeMnCO3
Mn HübneriteMnWO4
FeIron
Fe PyriteFeS2
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
CuCopper
Cu CovelliteCuS
Cu EnargiteCu3AsS4
Cu ChalcociteCu2S
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
AsArsenic
As EnargiteCu3AsS4
AgSilver
Ag SilverAg
Ag AcanthiteAg2S
SbAntimony
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
BaBarium
Ba BaryteBaSO4
WTungsten
W HübneriteMnWO4
PbLead
Pb GalenaPbS

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

Holocene
0 - 0.0117 Ma



ID: 2085655
Tailings, mine dumps, and slag piles

Age: Anthropocene (0 - 0.0117 Ma)

Description: tailings, mine dumps, slag

Lithology: Sand, gravel

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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