Dean Mine (Cumberland mine), Lewis Mining District, Lander County, Nevada, USAi
| Regional Level Types | |
|---|---|
| Dean Mine (Cumberland mine) | Mine |
| Lewis Mining District | Mining District |
| Lander County | County |
| Nevada | State |
| USA | Country |
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Latitude & Longitude (WGS84):
40° 25' 45'' North , 116° 50' 44'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Crescent Valley | 392 (2011) | 22.8km |
| Battle Mountain | 3,635 (2011) | 24.8km |
Sec 36 T30N R45E. Located near Mount Lewis, near Battle Mountain.
Structure: Laramide faulting; Dean Mine fault Roberts Mountains Thrust at depth
Alteration: sericitic, pyritic, propylitic
Commodity: Ore Materials: free gold, galena, sphalerite, pyrite, arsenopyrite, chalcopyrite Gangue Materials: quartz, calcite, barite
Deposit: The mineralization occurs in three veins: the Cumberland, the Morning Star and the Pittsburg.
Deposit type: Distal disseminated Ag-Au
Development: The history of the Dean Mine parallels that of the adjacent Hilltop District whose mines follow the same veins. The mine has been developed by numerous adits, shafts and other workings since the 1890s. Lessee C. B. Lancaster was mining ore here in 1938. In 1994, St. George Metals did exploration and development drifting at the Dean mine and stoping to mine about 5,000 tons of high-grade ore that had been blocked out earlier. The vein segment mined was 3 to 3.5 feet wide and 165 feet long with a 52? dip. The vein averaged in excess of 1 ounce of gold per ton . In 1995, Idaho Consolidated Metals Corp. optioned the Dean Mine and mill site and intended to establish sufficient high-grade reserves to justify the construction of a facility utilizing the Swisher-bromine hydrometallurgical process for refractory sulfide ores. In 2004, St. George held the reclamation permit for the Dean Mine.
Geology: Silver is subordinate to gold in the ore.
Ore(s): fractures, shears
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
28 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Aguilarite Formula: Ag4SeS |
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Baryte Formula: BaSO4 |
| ⓘ Boulangerite Formula: Pb5Sb4S11 |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Canfieldite Formula: Ag8SnS6 |
| ⓘ Cassiterite Formula: SnO2 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Clausthalite Formula: PbSe |
| ⓘ Freieslebenite ? Formula: AgPbSbS3 |
| ⓘ Galena Formula: PbS |
| ⓘ Gold Formula: Au |
| ⓘ Gold var. Electrum Formula: (Au,Ag) |
| ⓘ Hocartite Formula: Ag2(Fe2+,Zn)SnS4 |
| ⓘ Kermesite Formula: Sb2S2O |
| ⓘ Miargyrite Formula: AgSbS2 |
| ⓘ Owyheeite Formula: Ag3Pb10Sb11S28 |
| ⓘ Polybasite Formula: [Ag6Sb2S7][Ag9CuS4] |
| ⓘ Pyrargyrite Formula: Ag3SbS3 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrostilpnite Formula: Ag3SbS3 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodostannite Formula: Cu1+(Fe2+0.5Sn4+1.5)S4 |
| ⓘ Rhomboclase Formula: (H5O2)Fe3+(SO4)2 · 2H2O |
| ⓘ Silver Formula: Ag |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Stephanite Formula: Ag5SbS4 |
| ⓘ Stibnite Formula: Sb2S3 |
| ⓘ Uytenbogaardtite Formula: Ag3AuS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold var. Electrum | 1.AA.05 | (Au,Ag) |
| ⓘ | 1.AA.05 | Au | |
| ⓘ | Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Aguilarite | 2.BA.55 | Ag4SeS |
| ⓘ | Canfieldite | 2.BA.70 | Ag8SnS6 |
| ⓘ | Uytenbogaardtite | 2.BA.75 | Ag3AuS2 |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Hocartite | 2.CB.15a | Ag2(Fe2+,Zn)SnS4 |
| ⓘ | Clausthalite | 2.CD.10 | PbSe |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Rhodostannite | 2.DA.10 | Cu1+(Fe2+0.5Sn4+1.5)S4 |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | Kermesite | 2.FD.05 | Sb2S2O |
| ⓘ | Pyrargyrite | 2.GA.05 | Ag3SbS3 |
| ⓘ | Pyrostilpnite | 2.GA.10 | Ag3SbS3 |
| ⓘ | Stephanite | 2.GB.10 | Ag5SbS4 |
| ⓘ | Polybasite | 2.GB.15 | [Ag6Sb2S7][Ag9CuS4] |
| ⓘ | Miargyrite | 2.HA.10 | AgSbS2 |
| ⓘ | Boulangerite | 2.HC.15 | Pb5Sb4S11 |
| ⓘ | Owyheeite | 2.HC.35 | Ag3Pb10Sb11S28 |
| ⓘ | Freieslebenite ? | 2.JB.15 | AgPbSbS3 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Rhomboclase | 7.CB.55 | (H5O2)Fe3+(SO4)2 · 2H2O |
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10310310 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Northern Basin and RangeWide Rift
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Dean Mine, Lewis Mining District, Lander County, Nevada, USA