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Leonard Mine, Butte Mining District (Summit Valley Mining District), Butte-Silver Bow (Butte; Silver Bow Co.), Montana, USAi
Regional Level Types
Leonard MineMine
Butte Mining District (Summit Valley Mining District)Mining District
Butte-Silver Bow (Butte; Silver Bow Co.)City
MontanaState
USACountry

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Key
Latitude & Longitude (WGS84):
46° 1' 14'' North , 112° 30' 18'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Walkerville700 (2017)2.8km
Butte34,190 (2011)3.0km
Butte-Silver Bow (Balance)33,525 (2013)17.7km
Warm Springs3,000 (2013)28.0km
Basin212 (2011)33.5km


A former Cu-Ag-W-Pb-Zn mine located in secs. 7 & 89. T3N, R7W, MPM, E of the Berkeley pit, on private land. Discovered in 1886. The first production occurred in 1887. Owned and operated by the Anaconda Co., Butte, Montana 59701. MRDS database accuracy for this location is not stated.

Mineralisation is a polymetallic deposit hosted in quartz monzonite and granite. The ore body strikes N70E and dips steeply S. Ore is principally from horsetail ore bodies of the eastern portion of the main district & NW-trending main stage veins. The largest masses of quartz porphyry in the district are found near the Leonard & East Colusa shafts - these bodies are in or near the horsetail ore zone of the central district. Copper mineralisation occurs in horsetail ore bodies and NW-trending main stage veins. The ore body in places consisted of a mass of crushed granite. The ground between the veins was netted, lesser streaks were abundant and in many places, the granite was cobwebbed with ore. Local alteration includes main stage alteration. Associated rocks include Late Cretaceous quartz monzonite (Boulder batholith). Local rocks include alluvium.

Geologic structures include the regional Boulder batholith and the local Rarus fault.

Mining has been exclusively on selective veins of both ages W of the middle fault, on horsetail bodies and selective veins between the middle fault and No. 20 fault. Very little exploration and development work have been carried out E of the No. 20 fault.

Note: Rhodochrosite specimens labelled as from the Leonard Mine are most likely not from this mine. Rhodochrosite should not have occurred at this mine. (Ref: Min. Rec. 33: 1).

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


25 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Mineralogical Record 33:1
Baryte
Formula: BaSO4
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.
Betekhtinite
Formula: (Cu,Fe)21Pb2S15
Reference: Mineralogical Record 33:1
Bornite
Formula: Cu5FeS4
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed; USGS Bulletin 625
Chalcocite
Formula: Cu2S
Reference: J Lorengo collection; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; USGS Bulletin 625
Chalcopyrite
Formula: CuFeS2
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Colusite
Formula: Cu13VAs3S16
Reference: Handbook of Mineralogy
Covellite
Formula: CuS
Reference: Mineralogical Record 33:1; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; USGS Bulletin 625
Dickite
Formula: Al2(Si2O5)(OH)4
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen
Digenite
Formula: Cu9S5
Reference: J Lorengo collection
Enargite
Formula: Cu3AsS4
Habit: Crystals
Colour: Black
Description: Occasionaly pseudomorphed after hubnerite.
Reference: Mineralogical Record 33:1; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; USGS Bulletin 625
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
Gold
Formula: Au
Reference: Geology and Ore Deposits of Butte District, Montana, W. Weed
Gypsum
Formula: CaSO4 · 2H2O
Reference: J Lorengo collection
Hinsdalite
Formula: PbAl3(PO4)(SO4)(OH)6
Description: Occurs as excellent colorless to greenish tinted transparent micro-crystals on enargite, covellite, and quartz crystals from the Leonard Mine.
Reference: Roberts et al., "Encyclopedia of Minerals". Van Nostrand Reinhold Co., 1974.
Hübnerite
Formula: MnWO4
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.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Mineralogical Record 33:1
Luzonite
Formula: Cu3AsS4
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Mineralogical Record 33:1
Pyrite
Formula: FeS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrophyllite
Formula: Al2Si4O10(OH)2
Reference: The Mineralogy of The Butte District, Montana; Guilbert and Zeihen
Quartz
Formula: SiO2
Reference: J Lorengo collection; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Rhodochrosite ?
Formula: MnCO3
Description: Very doubtful. Ref: Min. Rec. 33:1
Reference: Rocks & Min.: 61:12.
Sphalerite
Formula: ZnS
Reference: J Lorengo collection
'Tennantite'
Formula: Cu6(Cu4X2)As4S12S
Reference: J Lorengo collection
'Tetrahedrite'
Formula: Cu6(Cu4X2)Sb4S13
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.
Wurtzite
Formula: (Zn,Fe)S
Habit: Crystals
Colour: Black
Reference: J Lorengo collection

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
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
Luzonite2.KA.10Cu3AsS4
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
'Tennantite'2.GB.05Cu6(Cu4X2)As4S12S
'Tetrahedrite'2.GB.05Cu6(Cu4X2)Sb4S13
Wurtzite2.CB.45(Zn,Fe)S
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hübnerite4.DB.30MnWO4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
Rhodochrosite ?5.AB.05MnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Gypsum7.CD.40CaSO4 · 2H2O
Group 8 - Phosphates, Arsenates and Vanadates
Hinsdalite8.BL.05PbAl3(PO4)(SO4)(OH)6
Group 9 - Silicates
Dickite9.ED.05Al2(Si2O5)(OH)4
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Pyrophyllite9.EC.10Al2Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
Digenite2.4.7.3Cu9S5
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
Wurtzite2.8.7.1(Zn,Fe)S
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
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
Luzonite3.2.2.1Cu3AsS4
3 <ø < 4
'Tennantite'3.3.6.2Cu6(Cu4X2)As4S12S
'Tetrahedrite'3.3.6.1Cu6(Cu4X2)Sb4S13
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Rhodochrosite ?14.1.1.4MnCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 43 - COMPOUND PHOSPHATES, ETC.
Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hinsdalite43.4.1.5PbAl3(PO4)(SO4)(OH)6
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 1:1 layers
Dickite71.1.1.1Al2(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Pyrophyllite71.2.1.1Al2Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
Kaolinite-Al2(Si2O5)(OH)4

List of minerals for each chemical element

HHydrogen
H HinsdalitePbAl3(PO4)(SO4)(OH)6
H GypsumCaSO4 · 2H2O
H PyrophylliteAl2Si4O10(OH)2
H DickiteAl2(Si2O5)(OH)4
H ApatiteCa5(PO4)3(Cl/F/OH)
H MalachiteCu2(CO3)(OH)2
H KaoliniteAl2(Si2O5)(OH)4
CCarbon
C MalachiteCu2(CO3)(OH)2
C RhodochrositeMnCO3
OOxygen
O HinsdalitePbAl3(PO4)(SO4)(OH)6
O QuartzSiO2
O GypsumCaSO4 · 2H2O
O PyrophylliteAl2Si4O10(OH)2
O DickiteAl2(Si2O5)(OH)4
O HübneriteMnWO4
O BaryteBaSO4
O ApatiteCa5(PO4)3(Cl/F/OH)
O MalachiteCu2(CO3)(OH)2
O KaoliniteAl2(Si2O5)(OH)4
O RhodochrositeMnCO3
FFluorine
F FluoriteCaF2
F ApatiteCa5(PO4)3(Cl/F/OH)
AlAluminium
Al HinsdalitePbAl3(PO4)(SO4)(OH)6
Al PyrophylliteAl2Si4O10(OH)2
Al DickiteAl2(Si2O5)(OH)4
Al KaoliniteAl2(Si2O5)(OH)4
SiSilicon
Si QuartzSiO2
Si PyrophylliteAl2Si4O10(OH)2
Si DickiteAl2(Si2O5)(OH)4
Si KaoliniteAl2(Si2O5)(OH)4
PPhosphorus
P HinsdalitePbAl3(PO4)(SO4)(OH)6
P ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
S EnargiteCu3AsS4
S Wurtzite(Zn,Fe)S
S DigeniteCu9S5
S ChalcociteCu2S
S HinsdalitePbAl3(PO4)(SO4)(OH)6
S CovelliteCuS
S PyriteFeS2
S SphaleriteZnS
S GypsumCaSO4 · 2H2O
S TennantiteCu6(Cu4X2)As4S12S
S ColusiteCu13VAs3S16
S TetrahedriteCu6(Cu4X2)Sb4S13
S ChalcopyriteCuFeS2
S BorniteCu5FeS4
S GalenaPbS
S BaryteBaSO4
S LuzoniteCu3AsS4
S Betekhtinite(Cu,Fe)21Pb2S15
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
CaCalcium
Ca GypsumCaSO4 · 2H2O
Ca FluoriteCaF2
Ca ApatiteCa5(PO4)3(Cl/F/OH)
VVanadium
V ColusiteCu13VAs3S16
MnManganese
Mn HübneriteMnWO4
Mn RhodochrositeMnCO3
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe BorniteCu5FeS4
Fe Betekhtinite(Cu,Fe)21Pb2S15
CuCopper
Cu EnargiteCu3AsS4
Cu DigeniteCu9S5
Cu ChalcociteCu2S
Cu CovelliteCuS
Cu TennantiteCu6(Cu4X2)As4S12S
Cu ColusiteCu13VAs3S16
Cu TetrahedriteCu6(Cu4X2)Sb4S13
Cu ChalcopyriteCuFeS2
Cu BorniteCu5FeS4
Cu LuzoniteCu3AsS4
Cu Betekhtinite(Cu,Fe)21Pb2S15
Cu MalachiteCu2(CO3)(OH)2
ZnZinc
Zn Wurtzite(Zn,Fe)S
Zn SphaleriteZnS
AsArsenic
As EnargiteCu3AsS4
As TennantiteCu6(Cu4X2)As4S12S
As ColusiteCu13VAs3S16
As LuzoniteCu3AsS4
SbAntimony
Sb TetrahedriteCu6(Cu4X2)Sb4S13
BaBarium
Ba BaryteBaSO4
WTungsten
W HübneriteMnWO4
AuGold
Au GoldAu
PbLead
Pb HinsdalitePbAl3(PO4)(SO4)(OH)6
Pb GalenaPbS
Pb Betekhtinite(Cu,Fe)21Pb2S15

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Weed, W. (1912) Geology and Ore Deposits of the Butte District, Montana.
Sales, R.H. (1914) Ore Deposits at Butte, Montana, The Mineralogy of The Butte District, Montana.
Guilbert and Zeihen (1964).
Miller, R.N. (editor) (1973) Guidebook for the Butte Field Meeting, presented by the Society of Economic Geologists.
Roberts et al. (1974) Encyclopedia of Minerals. Van Nostrand Reinhold Co.
Montana Bureau of Mines & Geology (1975) Bulletin 95: 25.
Rocks & Minerals (1986) 61: 12.
Rocks & Minerals (1987) 62: 323.
Mineralogical Record (2002) 33: 1.
USGS (2005) Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10070469 & 10172707.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0300930005.
Montana Bureau of Mines & Geology, Bulletin 109: 19.
USGS Professional Paper 74: 210-15, Pl. X.

Other Databases

USGS MRDS Record:10070469

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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