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Emma Mine (Ancient Mine; Black Chief Mine), Butte, Butte Mining District (Summit Valley Mining District), Silver Bow Co., Montana, USAi
Regional Level Types
Emma Mine (Ancient Mine; Black Chief Mine)Mine
Butte- not defined -
Butte Mining District (Summit Valley Mining District)Mining District
Silver Bow Co.County
MontanaState
USACountry

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Key
Latitude & Longitude (WGS84):
46° 0' 21'' North , 112° 32' 30'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Butte34,190 (2011)0.6km
Walkerville700 (2017)3.2km
Butte-Silver Bow (Balance)33,525 (2013)14.6km
Warm Springs3,000 (2013)27.0km
Anaconda9,417 (2011)33.8km


A former Mn-Zn-Pb-Ag-Au occurrence/mine located in sec. 29, T1N, R7W, MPM, . Owned by Howard Stratton (100%), Montana (1988). The Ophir Mine was purchased in 1920 to work with the Emma. In 1924, the Czarromah claim was acquired, also the Mary Louise and Railroad claims. The USGS MRDS database stated accuracy for this locality is 250 meters.

Mineralization is a polymetallic deposit hosted in quartz monzonite. The vein crosses S. Washington Street. It ends in a high knob that overlooks Missoula Gulch. A smaller outcrop is beyond the gulch. Deposited at a lower temperature than the central deposits, such as the Leonard Mine, it has rhodochrosite as a major gangue mineral. Associated rocks include Late Cretaceous Butte Quartz Monzonite (Boulder Batholith). Local rocks include the Boulder batholith and broadly related stocks.

Workings include underground openings. During 1916 the shaft was dewatered to the 800 foot level. The ore body at that level was good in Zn-Pb-Ag values. A shaft was sunk on the 800 foot level. A crosscut was extended on the 1,600 foot level of the original mine. In 1920 a 1,763 foot crosscut was being extended towards the Ophir Mine. In 1926, the main shaft was to the 1,200 foot level. In 1942, 1,263 feet in shafts were added and 26,459 feet of drifts. In 1943, another 25,962 feet in shafts were added and 23,095 feed of drifts.

Mn was produced during the period 1934-1957.

Analytical data results: High-grade Zn ore (1922): 21% Zn, 38 ounces/ton Ag, 8% Pb on the 1,000 foot level. Mn bodies of 41% were found.

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


10 valid minerals.

Detailed Mineral List:

Alabandite
Formula: MnS
Reference: Mineralogical Record 33:1
Baryte
Formula: BaSO4
Reference: Mineralogical Record 33:1
Chalcopyrite
Formula: CuFeS2
Reference: [www.johnbetts-fineminerals.com]
Galena
Formula: PbS
Reference: Rocks & Min.: 16:244.
Molybdenite
Formula: MoS2
Reference: Mineralogical Record 33:1
Pyrite
Formula: FeS2
Reference: No reference listed
Quartz
Formula: SiO2
Reference: [www.johnbetts-fineminerals.com]; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Rhodochrosite
Formula: MnCO3
Reference: Rocks & Min.:61:12.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Rhodonite
Formula: Mn2+SiO3
Reference: Ore Deposits at Butte, Montana, R. H. Sales, 1914
Sphalerite
Formula: ZnS
Reference: Rocks & Min.: 16:244.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Alabandite2.CD.10MnS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Rhodochrosite5.AB.05MnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 9 - Silicates
Rhodonite9.DK.05Mn2+SiO3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Alabandite2.8.1.4MnS
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
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Rhodochrosite14.1.1.4MnCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=5
Rhodonite65.4.1.1Mn2+SiO3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

CCarbon
C RhodochrositeMnCO3
OOxygen
O RhodochrositeMnCO3
O QuartzSiO2
O RhodoniteMn2+SiO3
O BaryteBaSO4
SiSilicon
Si QuartzSiO2
Si RhodoniteMn2+SiO3
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S GalenaPbS
S SphaleriteZnS
S AlabanditeMnS
S BaryteBaSO4
S MolybdeniteMoS2
MnManganese
Mn RhodochrositeMnCO3
Mn RhodoniteMn2+SiO3
Mn AlabanditeMnS
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
MoMolybdenum
Mo MolybdeniteMoS2
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS

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, USGS Professional Paper 74: 255-256.
Sales, R. H. (1914), Ore Deposits at Butte, Montana.
USGS-U.S. Bureau of Mines (1916-1958), Minerals Yearbooks.
Rocks & Minerals (1941): 16: 244.
Crowley, F.A., Morgan, T., Fulkerson, F.B., and Kingston, G.A. (1960), Directory of Known Mining Enterprises, 1959: Montana Bureau of Mines and Geology Bulletin 14, 73 p.
Rocks & Minerals (1986): 61: 12.
U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS), U.S. Bureau of Mines, file ID #0300930329.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, deposit ID #10019641 & 10216178.
USGS MRDS ID #DC11028.

USGS MRDS Record:10216178
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