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Emma Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USAi
| Regional Level Types | |
|---|---|
| Emma Mine | Mine |
| Butte Mining District (Summit Valley Mining District) | Mining District |
| Silver Bow County | County |
| Montana | State |
| USA | Country |
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Latitude & Longitude (WGS84):
46° 0' 35'' North , 112° 32' 14'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Butte | 34,190 (2011) | 0.7km |
| Walkerville | 700 (2017) | 2.7km |
| Butte-Silver Bow (Balance) | 33,525 (2013) | 15.1km |
| Warm Springs | 3,000 (2013) | 27.0km |
| Anaconda | 9,417 (2011) | 33.9km |
Other/historical names associated with this locality:
Ancient Mine, Black Chief Mine
The largest manganese mine in Butte, and the most significant producer of rhodochrosite in the state. The mine has since been completely destroyed by reclamation and is now a small grassy area near Montana Street. The hoist from the mine now sits at the World Museum of Mining in Butte.
The mine was originally developed for silver as the Ancient Mine, but was later called the Emma. It was connected to the Ophir Mine which was purchased in 1920 to work with it. In 1924, the Czarromah claim was acquired, also the Mary Louise and Railroad claims. The mine hit its peak from the 1930s-1950s when later discoveries of base metals made it a great producer. It was abandoned in 1957.
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 feet 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.
REF:Deposit:: CRIB
Deposit:: MPF 41.39
The mine was originally developed for silver as the Ancient Mine, but was later called the Emma. It was connected to the Ophir Mine which was purchased in 1920 to work with it. In 1924, the Czarromah claim was acquired, also the Mary Louise and Railroad claims. The mine hit its peak from the 1930s-1950s when later discoveries of base metals made it a great producer. It was abandoned in 1957.
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 feet 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.
REF:Deposit:: CRIB
Deposit:: MPF 41.39
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
15 valid minerals.
Detailed Mineral List:
| ⓘ Alabandite Formula: MnS |
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 References: |
| ⓘ Baryte Formula: BaSO4 |
| ⓘ Calcite Formula: CaCO3 References: |
| ⓘ Chalcopyrite Formula: CuFeS2 References: |
| ⓘ 'Chlorite Group' References: |
| ⓘ Dolomite Formula: CaMg(CO3)2 References: |
| ⓘ Galena Formula: PbS References: |
| ⓘ 'Heulandite Subgroup' Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O References: |
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Native Silver Formula: Ag References: |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodochrosite Formula: MnCO3 |
| ⓘ Rhodonite Formula: CaMn3Mn[Si5O15] |
| ⓘ Sphalerite Formula: ZnS References: |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Alabandite | 2.CD.10 | MnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| 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 |
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| Group 9 - Silicates | |||
| ⓘ | Rhodonite | 9.DK.05 | CaMn3Mn[Si5O15] |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Heulandite Subgroup' | - | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| O | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Na | Sodium | |
| Na | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Mg | Magnesium | |
| Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Al | Aluminium | |
| Al | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Alabandite | MnS |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Ca | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Ca | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Mn | Manganese | |
| Mn | ⓘ Alabandite | MnS |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Mn | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Fe | Iron | |
| Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Ag | Silver | |
| Ag | ⓘ Native Silver | Ag |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10216178 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Great Falls DomainDomain
- Northern Rocky MountainsWide Rift
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Emma Mine, Butte Mining District, Silver Bow County, Montana, USA