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Lexington Mine, Walkerville, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA i
Regional Level Types
Lexington Mine Mine
Walkerville Area
Butte Mining District (Summit Valley Mining District) Mining District
Silver Bow County County
Montana State
USA Country

Regional Level Types
Lexington Mine	Mine
Walkerville	Area
Butte Mining District (Summit Valley Mining District)	Mining District
Silver Bow County	County
Montana	State
USA	Country

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View of the Butte copper-silver mining area, in 1897.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Rhodochrosite

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Rhodochrosite

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

View of the Butte copper-silver mining area, in 1897.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Rhodochrosite

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

View of the Butte copper-silver mining area, in 1897.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Rhodochrosite

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Latitude & Longitude (WGS84):

46° 1' 40'' North , 112° 32' 6'' West

Latitude & Longitude (decimal):

Type:

Köppen climate type:

Dfb : Warm-summer humid continental climate

Nearest Settlements:

Place	Population	Distance
Walkerville	700 (2017)	0.7km
Butte	34,190 (2011)	2.7km
Butte-Silver Bow (Balance)	33,525 (2013)	16.9km
Warm Springs	3,000 (2013)	25.7km
Anaconda	9,417 (2011)	33.3km

Mindat Locality ID:

6851

Long-form identifier:

mindat:1:2:6851:5

GUID (UUID V4):

No description has been added for this locality. Can you add one?

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

25 valid minerals.

Detailed Mineral List:

ⓘ Acanthite

Formula: Ag₂S

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gammons, C. H., Szarkowski, J., & Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining engineering Magazine website

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Calcite

Formula: CaCO₃

References:

Jenkins, Robert E. II, Lorengo, Jerry A. (2002) Butte, Montana: Minerals, Mines and History. The Mineralogical Record, 33 (1) 5-69

ⓘ Canfieldite

Formula: Ag₈SnS₆

References:

King, Van (n.d.) Personal communcation.

ⓘ Cerussite

Formula: PbCO₃

References:

Pg14, Table 7-2, Oxidation of the Peripheral Zone mineralogy summary.

Guilbert, J., Zeihen, L.G. (1964) The mineralogy of the Butte district, Montana. Open-File Report 268. Montana Bureau of Mines and Geology

ⓘ 'Chabazite'

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ 'Chlorite Group'

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Dolomite

Formula: CaMg(CO₃)₂

References:

Jenkins, Robert E. II, Lorengo, Jerry A. (2002) Butte, Montana: Minerals, Mines and History. The Mineralogical Record, 33 (1) 5-69

ⓘ Epidote

Formula: (CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Galena

Formula: PbS

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gammons, C. H., Szarkowski, J., & Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining engineering Magazine website

ⓘ Helvine

Formula: Be₃Mn²⁺₄(SiO₄)₃S

References:

Rocks & Min.: 16: 244.

Dunn, Pete J. (1976) Genthelvite and the helvine group. Mineralogical Magazine, 40 (314) 627-636 doi:10.1180/minmag.1976.040.314.10

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ 'Heulandite Subgroup'

Formula: (Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂

ⓘ Marcasite

Formula: FeS₂

References:

Jenkins, Robert E. II, Lorengo, Jerry A. (2002) Butte, Montana: Minerals, Mines and History. The Mineralogical Record, 33 (1) 5-69

ⓘ Molybdenite

Formula: MoS₂

References:

From hand sample note on specimen collected by M.H.Gidel, Anaconda Geologist, 1951

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Native Gold

Formula: Au

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Native Silver

Formula: Ag

References:

Gammons, C. H., Szarkowski, J., & Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining engineering Magazine website

ⓘ Pearceite

Formula: [Ag₆As₂S₇][Ag₉CuS₄]

References:

Gammons, C. H., Szarkowski, J., & Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining engineering Magazine website

ⓘ Pyrargyrite

Formula: Ag₃SbS₃

References:

King, Van (n.d.) Personal communcation.

ⓘ Pyrite

Formula: FeS₂

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Quartz

Formula: SiO₂

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gammons, C. H., Szarkowski, J., & Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining engineering Magazine website

ⓘ Rhodochrosite

Formula: MnCO₃

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gammons, C. H., Szarkowski, J., & Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining engineering Magazine website

ⓘ Rhodonite

Formula: CaMn₃Mn[Si₅O₁₅]

References:

Rocks & Min.: 16: 244.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Siderite

Formula: FeCO₃

References:

Jenkins, Robert E. II, Lorengo, Jerry A. (2002) Butte, Montana: Minerals, Mines and History. The Mineralogical Record, 33 (1) 5-69

ⓘ Sphalerite

Formula: ZnS

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Stephanite

Formula: Ag₅SbS₄

References:

King, Van (n.d.) Personal communcation.

ⓘ 'Stilbite Subgroup'

Formula: M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

Gallery:

PbSⓘ Galena

Galena, etc.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Galena, etc.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Galena, etc.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Ag₃SbS₃ⓘ Pyrargyrite

Pyrargyrite, etc.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Pyrargyrite, etc.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

Pyrargyrite, etc.

Lexington Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA

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
ⓘ	Acanthite	2.BA.35	Ag₂S
ⓘ	Canfieldite	2.BA.70	Ag₈SnS₆
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Galena	2.CD.10	PbS
ⓘ	Molybdenite	2.EA.30	MoS₂
ⓘ	Pyrite	2.EB.05a	FeS₂
ⓘ	Marcasite	2.EB.10a	FeS₂
ⓘ	Pyrargyrite	2.GA.05	Ag₃SbS₃
ⓘ	Stephanite	2.GB.10	Ag₅SbS₄
ⓘ	Pearceite	2.GB.15	[Ag₆As₂S₇][Ag₉CuS₄]
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Rhodochrosite	5.AB.05	MnCO₃
ⓘ	Siderite	5.AB.05	FeCO₃
ⓘ	Dolomite	5.AB.10	CaMg(CO₃)₂
ⓘ	Cerussite	5.AB.15	PbCO₃
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Rhodonite	9.DK.05	CaMn₃Mn[Si₅O₁₅]
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Helvine	9.FB.10	Be₃Mn²⁺₄(SiO₄)₃S
Unclassified
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Chabazite'	-
ⓘ	'Chlorite Group'	-
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
ⓘ	'Hornblende Root Name Group'	-	◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)

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	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
H	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Be	Beryllium
Be	ⓘ Helvine	Be₃Mn₄²⁺(SiO₄)₃S
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Cerussite	PbCO₃
C	ⓘ Dolomite	CaMg(CO₃)₂
C	ⓘ Rhodochrosite	MnCO₃
C	ⓘ Siderite	FeCO₃
O	Oxygen
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Cerussite	PbCO₃
O	ⓘ Dolomite	CaMg(CO₃)₂
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Helvine	Be₃Mn₄²⁺(SiO₄)₃S
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Rhodochrosite	MnCO₃
O	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
O	ⓘ Siderite	FeCO₃
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Dolomite	CaMg(CO₃)₂
Al	Aluminium
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Al	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Si	Silicon
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Helvine	Be₃Mn₄²⁺(SiO₄)₃S
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Acanthite	Ag₂S
S	ⓘ Canfieldite	Ag₈SnS₆
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Galena	PbS
S	ⓘ Helvine	Be₃Mn₄²⁺(SiO₄)₃S
S	ⓘ Marcasite	FeS₂
S	ⓘ Molybdenite	MoS₂
S	ⓘ Pearceite	[Ag₆As₂S₇][Ag₉CuS₄]
S	ⓘ Pyrargyrite	Ag₃SbS₃
S	ⓘ Pyrite	FeS₂
S	ⓘ Sphalerite	ZnS
S	ⓘ Stephanite	Ag₅SbS₄
Cl	Chlorine
Cl	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Dolomite	CaMg(CO₃)₂
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ti	Titanium
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Titanite	CaTi(SiO₄)O
Mn	Manganese
Mn	ⓘ Helvine	Be₃Mn₄²⁺(SiO₄)₃S
Mn	ⓘ Rhodochrosite	MnCO₃
Mn	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Fe	Iron
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	ⓘ Marcasite	FeS₂
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Siderite	FeCO₃
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Pearceite	[Ag₆As₂S₇][Ag₉CuS₄]
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
As	Arsenic
As	ⓘ Pearceite	[Ag₆As₂S₇][Ag₉CuS₄]
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Mo	Molybdenum
Mo	ⓘ Molybdenite	MoS₂
Ag	Silver
Ag	ⓘ Acanthite	Ag₂S
Ag	ⓘ Canfieldite	Ag₈SnS₆
Ag	ⓘ Pearceite	[Ag₆As₂S₇][Ag₉CuS₄]
Ag	ⓘ Pyrargyrite	Ag₃SbS₃
Ag	ⓘ Native Silver	Ag
Ag	ⓘ Stephanite	Ag₅SbS₄
Sn	Tin
Sn	ⓘ Canfieldite	Ag₈SnS₆
Sb	Antimony
Sb	ⓘ Pyrargyrite	Ag₃SbS₃
Sb	ⓘ Stephanite	Ag₅SbS₄
Au	Gold
Au	ⓘ Native Gold	Au
Pb	Lead
Pb	ⓘ Cerussite	PbCO₃
Pb	ⓘ Galena	PbS

Other Regions, Features and Areas containing this locality

North AmericaContinent

Rocky MountainsMountain Range

North America PlateTectonic Plate

Great Falls DomainDomain
Northern Rocky MountainsWide Rift

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Rocks & Minerals (xxxx) 16, 244.

Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74

Sales, Reno H. (1914) Ore Deposits at Butte, Montana (with Discussion). Transactions of The American Institute of Mining Engineers, 46. 3-109

Gammons, C.H., Szarkowski, J., and Stevenson, R. (2016) New investigations of the mineralogy of silver in the world-class porphyry-lode deposits of Butte, MT. Mining Engineering Magazine website [http://me.smenet.org/docs/Publications/ME/Issue/WebExclusiveFinal.pdf]

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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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