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Nenzel Hill, Rochester District, Pershing Co., Nevada, USAi
Regional Level Types
Nenzel HillHill
Rochester DistrictMining District
Pershing Co.County
NevadaState
USACountry

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Latitude & Longitude (WGS84):
40° 16' 60'' North , 118° 9' 14'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Lovelock1,878 (2017)29.5km
Humboldt119 (2011)36.5km
Imlay171 (2011)41.9km


The Rochester District, in Pershing County, Nevada, was prospected beginning just after the Civil War. Early discoveries were of vein and placer gold. In the heart of the Rochester District is a topographic high called Nenzel Hill, named for Joseph Nenzel whose wife inherited a group of claims staked by her uncle around 1905. Nenzel discovered quartz veins containing very fine grained, dispersed argentite there around 1912. The discovery came very late in the history of gold and silver in the American west perhaps because of the very nondescript nature of the ore. The discovery of other similar vein silver deposits followed but those on Nenzel Hill were the most productive.

The Rochester District is underlain by late Paleozoic and Triassic age volcanics. Common among these volcanics are rhyolites have frequently been altered to a quartz-sericite-pyrite mineral assemblage. Deformation and the intrusion of granite porphyry and other granitic lithologies occurred in the Cretaceous. It is most likely that the silver-gold mineralization developed during this later phase of volcanism.

Most of the productive ore deposits, worked in the initial pulse of activity in the district, are vein-type occurrences. However, in large areas the country rock is cut by networks of small mineralized fractures, the whole of which is known as stockworks. In the initial period of mining the stockworks were not economically viable except at the Nevada Packard mine south of Nenzel Hill.

Today, in a much different economic and technological environment the stockworks have gained supreme importance. Vikre (1981) noted that the low grade silver-gold ore in the area around Nenzel Hill amount to 100 million tons. Since the mid-1980's that area, including Nenzel Hill, has become part of a large open pit mine operated by Coeur Rochester. A subsidiary pit has been developed south of the Nenzel Hill area on the site of the former Nevada Packard Mine.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

27 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Anglesite
Formula: PbSO4
Reference: Econ Geol (1981) 76:580-609
Arsenopyrite
Formula: FeAsS
Reference: Econ Geol (1981) 76:580-609
Chalcanthite
Formula: CuSO4 · 5H2O
Reference: Econ Geol (1981) 76:580-609
Chalcocite
Formula: Cu2S
Reference: Econ Geol (1981) 76:580-609
Chalcophanite
Formula: (Zn,Fe,Mn)Mn3O7 · 3H2O
Reference: Econ Geol (1981) 76:580-609
Chalcopyrite
Formula: CuFeS2
Chlorargyrite
Formula: AgCl
Reference: Econ Geol (1981) 76:580-609
Chlorargyrite var: Bromian Chlorargyrite
Formula: Ag(Cl,Br)
Reference: Econ Geol (1981) 76:580-609
Covellite
Formula: CuS
Reference: Econ Geol (1981) 76:580-609
'Electrum'
Formula: (Au, Ag)
Reference: Econ Geol (1981) 76:580-609
Galena
Formula: PbS
Goethite
Formula: α-Fe3+O(OH)
Reference: Econ Geol (1981) 76:580-609
Gold
Formula: Au
Reference: Econ Geol (1981) 76:580-609
Hematite
Formula: Fe2O3
Reference: Econ Geol (1981) 76:580-609
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Econ Geol (1981) 76:580-609
'K Feldspar'
Reference: Econ Geol (1981) 76:580-609
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Econ Geol (1981) 76:580-609
Melanterite
Formula: Fe2+(H2O)6SO4 · H2O
Reference: Econ Geol (1981) 76:580-609
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Econ Geol (1981) 76:580-609
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Econ Geol (1981) 76:580-609
Owyheeite
Formula: Ag3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
Reference: Econ Geol (1981) 76:580-609
Polybasite
Formula: [(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Reference: Econ Geol (1981) 76:580-609
Pyrargyrite
Formula: Ag3SbS3
Reference: Econ Geol (1981) 76:580-609
Pyrite
Formula: FeS2
Pyrrhotite
Formula: Fe7S8
Reference: Econ Geol (1981) 76:580-609
Quartz
Formula: SiO2
Silver
Formula: Ag
Reference: Econ Geol (1981) 76:580-609
Sphalerite
Formula: ZnS
Stromeyerite
Formula: AgCuS
Reference: Econ Geol (1981) 76:580-609
Teallite
Formula: PbSnS2
Reference: Econ Geol (1981) 76:580-609
Tetrahedrite
Formula: Cu6Cu4(Fe2+,Zn)2Sb4S12S
'Wad'
Reference: Econ Geol (1981) 76:580-609

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Electrum'1.AA.05(Au, Ag)
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Arsenopyrite2.EB.20FeAsS
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Galena2.CD.10PbS
Owyheeite2.HC.35Ag3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
Polybasite2.GB.15[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Pyrargyrite2.GA.05Ag3SbS3
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Stromeyerite2.BA.40AgCuS
Teallite2.CD.05PbSnS2
Tetrahedrite2.GB.05Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 3 - Halides
Chlorargyrite3.AA.15AgCl
var: Bromian Chlorargyrite3.AA.15Ag(Cl,Br)
Group 4 - Oxides and Hydroxides
Chalcophanite4.FL.20(Zn,Fe,Mn)Mn3O7 · 3H2O
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Chalcanthite7.CB.20CuSO4 · 5H2O
Jarosite7.BC.10KFe3+ 3(SO4)2(OH)6
Melanterite7.CB.35Fe2+(H2O)6SO4 · H2O
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'K Feldspar'-
'Limonite'-(Fe,O,OH,H2O)
'Wad'-

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
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
Chalcocite2.4.7.1Cu2S
Stromeyerite2.4.6.1AgCuS
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Teallite2.9.10.1PbSnS2
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø > 4
Polybasite3.1.7.2[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
3 <ø < 4
Tetrahedrite3.3.6.1Cu6Cu4(Fe2+,Zn)2Sb4S12S
ø = 3
Pyrargyrite3.4.1.2Ag3SbS3
2.5 < ø < 3
Owyheeite3.5.10.1Ag3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB3X7
Chalcophanite7.8.2.1(Zn,Fe,Mn)Mn3O7 · 3H2O
Group 9 - NORMAL HALIDES
AX
Chlorargyrite9.1.4.1AgCl
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Chalcanthite29.6.7.1CuSO4 · 5H2O
Melanterite29.6.10.1Fe2+(H2O)6SO4 · H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Chlorargyrite
var: Bromian Chlorargyrite
-Ag(Cl,Br)
'Electrum'-(Au, Ag)
'K Feldspar'-
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Wad'-

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
H JarositeKFe3+ 3(SO4)2(OH)6
H MelanteriteFe2+(H2O)6SO4 · H2O
H Limonite(Fe,O,OH,H2O)
H Goethiteα-Fe3+O(OH)
H ChalcanthiteCuSO4 · 5H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
OOxygen
O QuartzSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
O JarositeKFe3+ 3(SO4)2(OH)6
O MelanteriteFe2+(H2O)6SO4 · H2O
O AnglesitePbSO4
O Limonite(Fe,O,OH,H2O)
O HematiteFe2O3
O Goethiteα-Fe3+O(OH)
O ChalcanthiteCuSO4 · 5H2O
O MuscoviteKAl2(AlSi3O10)(OH)2
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S AcanthiteAg2S
S PyriteFeS2
S SphaleriteZnS
S TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
S GalenaPbS
S ChalcopyriteCuFeS2
S ArsenopyriteFeAsS
S CovelliteCuS
S ChalcociteCu2S
S StromeyeriteAgCuS
S Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
S PyrargyriteAg3SbS3
S PyrrhotiteFe7S8
S TeallitePbSnS2
S OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
S JarositeKFe3+ 3(SO4)2(OH)6
S MelanteriteFe2+(H2O)6SO4 · H2O
S AnglesitePbSO4
S ChalcanthiteCuSO4 · 5H2O
ClChlorine
Cl ChlorargyriteAgCl
Cl Chlorargyrite (var: Bromian Chlorargyrite)Ag(Cl,Br)
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K JarositeKFe3+ 3(SO4)2(OH)6
K MuscoviteKAl2(AlSi3O10)(OH)2
MnManganese
Mn Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
FeIron
Fe PyriteFeS2
Fe TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Fe ChalcopyriteCuFeS2
Fe ArsenopyriteFeAsS
Fe PyrrhotiteFe7S8
Fe Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe MelanteriteFe2+(H2O)6SO4 · H2O
Fe Limonite(Fe,O,OH,H2O)
Fe HematiteFe2O3
Fe Goethiteα-Fe3+O(OH)
CuCopper
Cu TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Cu ChalcopyriteCuFeS2
Cu CovelliteCuS
Cu ChalcociteCu2S
Cu StromeyeriteAgCuS
Cu Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Cu ChalcanthiteCuSO4 · 5H2O
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Zn Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
AsArsenic
As ArsenopyriteFeAsS
As Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
BrBromine
Br Chlorargyrite (var: Bromian Chlorargyrite)Ag(Cl,Br)
AgSilver
Ag AcanthiteAg2S
Ag StromeyeriteAgCuS
Ag Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Ag PyrargyriteAg3SbS3
Ag OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
Ag Electrum(Au, Ag)
Ag ChlorargyriteAgCl
Ag Chlorargyrite (var: Bromian Chlorargyrite)Ag(Cl,Br)
Ag SilverAg
SnTin
Sn TeallitePbSnS2
SbAntimony
Sb TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Sb Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Sb PyrargyriteAg3SbS3
Sb OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
AuGold
Au Electrum(Au, Ag)
Au GoldAu
PbLead
Pb GalenaPbS
Pb TeallitePbSnS2
Pb OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
Pb AnglesitePbSO4

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

Triassic
201.3 - 251.902 Ma



ID: 3184762
Mesozoic sedimentary rocks

Age: Triassic (201.3 - 251.902 Ma)

Lithology: Sedimentary rocks

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]

Middle Triassic - Early Triassic
237 - 251.902 Ma



ID: 2958617
Andesite, rhyolite, tuff, and volcaniclastic rocks

Age: Triassic (237 - 251.902 Ma)

Stratigraphic Name: Koipato Group

Description: Andesite, rhyolite, tuff, and generally siliceous volcaniclastic rocks make up the Koipato Group, which lies unconformably below the Humboldt assemblage. The Koipato Group consists of altered porphyritic andesite flows and flow breccia of the Limerick Greenstone, altered felsite and coarse-grained tuffaceous sedimentary rocks of the Rochester Rhyolite, and quartz-rich ash-flow tuff and tuffaceous sedimentary rocks of the Weaver Rhyolite. It is present in Churchill, Humboldt, Lander, and mostly Pershing Counties where it unconformably overlies deformed rocks of the Golconda terrane (GC). The upper part of the Koipato contains late Early Triassic (Spathian) fossils (Silberling, 1973; Wallace, Tatlock, and others, 1969). It is depositionally overlain by the Star Peak Group (TRc), a sequence of carbonate platform deposits at the base of the Humboldt assemblage. Radiometric dates from the 1970s (McKee and Burke, 1972) suggest a Middle to Early Triassic age.

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,rhyolite,clastic}

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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Economic Geology (1981): 76: 580-609.

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