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Potosi Mine, Comstock Lode, Virginia City, Comstock District, Storey Co., Nevada, USAi
Regional Level Types
Potosi MineMine
Comstock LodeLode
Virginia CityCity
Comstock DistrictMining District
Storey Co.County
NevadaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 39° 18' 13'' North , 119° 39' 13'' West
Latitude & Longitude (decimal): 39.30379,-119.65378
GeoHash:G#: 9qfzt5nc0
USGS MRDS Record:10043937
Locality type:Mine
Köppen climate type:Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Virginia City855 (2011)0.7km
Dayton8,964 (2011)9.1km
Carson City54,521 (2017)18.4km
Stagecoach1,874 (2011)25.3km
Indian Hills5,627 (2011)26.7km


A former Ag-Mn mine.
Structure: Regional Dip To West And Northwest Faults

Alteration: Propylitization, Oxidation, Pyritization

Deposit: Ore in hanging wall of comstock fault. A bonanza strike, shallow ride deposits were mined in the 1870's. A deep shaft was sunk in the 1880's, but in general the lower levels were unproductive. Various leasers extracted ore from the outcrop and shallow workings until 1923. The near-surface ore bodies were v-shaped and about 1200 ft long and 300 ft. Wide. The ore occurs in the hanging wall. The footwall is composed of barren quartz orig. Claim staked in 1860, staked over 400 feet of adjacent chollar claim. After many court fights, the two companies were incorporated As the chollar-potosi mining co ; info.src : 1 pub lit

Deposit type: Epithermal vein, Comstock

Development: Rich, shallow deposit mined in 1870's; deeper development in 1880's was unproductive original claim staked over 400 feet of adjacent chollar claim

Ore(s): Comstock Fault

Regions containing this locality

North America PlateTectonic Plate

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


7 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Aurorite
Formula: (Mn2+,Ag,Ca)Mn4+3O7 · 3H2O
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Chalcopyrite
Formula: CuFeS2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Galena
Formula: PbS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Sphalerite
Formula: ZnS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Wad'
Reference: NBMG Spec. Pub. 31 Minerals of Nevada

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Aurorite4.FL.20(Mn2+,Ag,Ca)Mn4+3O7 · 3H2O
Quartz4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Wad'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmXp, with m:p = 1:1
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
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB3X7
Aurorite7.8.2.2(Mn2+,Ag,Ca)Mn4+3O7 · 3H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Wad'-

List of minerals for each chemical element

HHydrogen
H Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
OOxygen
O QuartzSiO2
O Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
SiSilicon
Si QuartzSiO2
SSulfur
S AcanthiteAg2S
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
CaCalcium
Ca Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
MnManganese
Mn Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AgSilver
Ag Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
Ag AcanthiteAg2S
PbLead
Pb GalenaPbS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neogene
2.588 - 23.03 Ma



ID: 3186305
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Columbia River Basalt

Comments: Columbia Plateau

Lithology: Flood basalt(s); mafic volcanic rocks; basalt

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Miocene
5.333 - 23.03 Ma



ID: 2740549
Younger andesite and intermediate flows and breccias

Age: Miocene (5.333 - 23.03 Ma)

Stratigraphic Name: Kate Peak Formation; Alta Formation; Wahmonie Formation; Salyer Formation; Gilbert Andesite

Description: Includes some rocks mapped as the Kate Peak and Alta Formations on the Washoe South map; Wahmonie and Salyer Formations on the Nye South map; Gilbert Andesite on the Esmeralda map; pyroxene, hornblende phenoandesite, and phenodacite on the Elko map; and other unnamed units. It corresponds to the unit Ta3 on the 1978 State map. It is present everywhere except Eureka and White Pine Counties.

Comments: Original map source: Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000.

Lithology: Major:{andesite,dacite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Nevada Bureau of Mines and Geology, Minerals of Nevada, Special Publication 31.


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