Cortez Hills underground, Cortez Mining District, Lander County, Nevada, USAi
Regional Level Types | |
---|---|
Cortez Hills underground | - not defined - |
Cortez Mining District | Mining District |
Lander County | County |
Nevada | State |
USA | Country |
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Latitude & Longitude (WGS84):
40° 10' 8'' North , 116° 36' 9'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Crescent Valley | 392 (2011) | 27.5km |
Battle Mountain | 3,635 (2011) | 59.6km |
Mindat Locality ID:
274162
Long-form identifier:
mindat:1:2:274162:1
GUID (UUID V4):
daf32644-a96d-4837-a69c-020ecece88b6
Carlin type gold deposit in breccia
Structure: The deposit lies within the Cortez Window of the Roberts Mountain Thrust (Cortez Range). The deposit occurs within the Cortez Window in the Roberts Mountain Thrust.
Alteration: Host rocks have been decalcified, silicified, leached, bleached, argillized, and oxidized. This phase of low grade hydrothermal alteration occurred after intrusion of the porphyry sill, and removed most of the carbon. A decalcification halo extends into the host rock surrounding the mineralized area. Mineralization is associated with silicification. Pervasive oxidation and marble development are key alteration types associated with gold deposition
Tectonics: The upper portion of the Devonian carbonate sequence beneath the Roberts Mountains thrust hosts the Cortez Hills deposit.
Commodity: Commodity Info: Gold is submicroscopic (micron to submicron-sized particles of native gold), occurring in minute specks of arsenian pyrite. Ore Materials: native gold, pyrite Gangue Materials: hematite, goethite; gangue: quartz, carbonate, clays
Deposit: The recent Cortez Hills discovery is the result of focused exploration efforts along an extensive high-angle fault corridor that localizes the distribution of gold in the Cortez area. Projection of this structural corridor under cover, coupled with gravity data, were the key exploration techniques that led to the discovery of Cortez Hills. Gold is localized where limestone was faulted, brecciated and folded along margin of Tertiary intrusive, gold is micron-to sub-micron-size. The upper portion of the Devonian carbonate sequence beneath the Roberts Mountains thrust hosts the Cortez Hills deposit. Pervasive oxidation and marble development are key alteration types associated with gold deposit. The Cortez Hills deposit is hosted in the upper portion of the Devonian carbonate sequence. It has a strike length of more than 300 m and is approximately 200 m wide. The mineralized zone starts approximately 120 m below surface and continues up to 460 m. The deposit remains open with expansion potential evident to the west and at depth.
Deposit type: Sediment-hosted Au
Development: Placer Dome is the operator and owner of a 60% joint venture interest in the Cortez Joint Venture (CJV). The remaining 40% is held by Kennecott Explorations (Australia) Ltd. The recent Cortez Hills discovery is the result of focused exploration efforts by CJV staff along an extensive high-angle fault corridor that localizes the distribution of gold in the Cortez area. Projection of this structural corridor under cover, coupled with gravity data, were the key exploration techniques that led to the discovery of Cortez Hills. June 2004, Placer announced that they had drilled a hole in the area between the Cortez Hills and the Pediment deposits that had returned 1.5 ounces per ton over more than 400 feet.
Geology: The deposit is also associated with the Horse Canyon volcanics (andesite flows, rhyolite plug) and the Roberts Mountain Limestone (silty, argillaceous, carbonaceous, pyrite-bearing limestone).
Ore(s): Gold is localized where limestone was faulted, brecciated and folded along the margin of a Tertiary intrusive.
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
20 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:
β Aktashite Formula: Cu6Hg3As4S12 |
β Calcite Formula: CaCO3 |
β Chalcopyrite Formula: CuFeS2 |
β Christite Formula: TlHgAsS3 |
β Cinnabar Formula: HgS |
β Dickite Formula: Al2(Si2O5)(OH)4 |
β Goethite Formula: Ξ±-Fe3+O(OH) |
β Gold Formula: Au |
β Hematite Formula: Fe2O3 |
β Jarosite Formula: KFe3+3(SO4)2(OH)6 |
β Kaolinite Formula: Al2(Si2O5)(OH)4 |
β Millerite Formula: NiS |
β Montmorillonite Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Illite Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
β Pyrite Formula: FeS2 |
β Pyrrhotite Formula: Fe1-xS |
β Quartz Formula: SiO2 |
β Realgar Formula: As4S4 |
β Sphalerite Formula: ZnS |
β Tremolite Formula: ◻Ca2Mg5(Si8O22)(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Pyrrhotite | 2.CC.10 | Fe1-xS |
β | Millerite | 2.CC.20 | NiS |
β | Cinnabar | 2.CD.15a | HgS |
β | Pyrite | 2.EB.05a | FeS2 |
β | Realgar | 2.FA.15a | As4S4 |
β | Aktashite | 2.GA.30 | Cu6Hg3As4S12 |
β | Christite | 2.HD.15 | TlHgAsS3 |
Group 4 - Oxides and Hydroxides | |||
β | Goethite | 4.00. | Ξ±-Fe3+O(OH) |
β | Hematite | 4.CB.05 | Fe2O3 |
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
Group 9 - Silicates | |||
β | Tremolite | 9.DE.10 | β»Ca2Mg5(Si8O22)(OH)2 |
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Illite | 9.EC.15 | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
β | Montmorillonite | 9.EC.40 | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 Β· nH2O |
β | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
β | Dickite | 9.ED.05 | Al2(Si2O5)(OH)4 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Dickite | Al2(Si2O5)(OH)4 |
H | β Goethite | Ξ±-Fe3+O(OH) |
H | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
H | β Jarosite | KFe33+(SO4)2(OH)6 |
H | β Kaolinite | Al2(Si2O5)(OH)4 |
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
H | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
C | Carbon | |
C | β Calcite | CaCO3 |
O | Oxygen | |
O | β Calcite | CaCO3 |
O | β Dickite | Al2(Si2O5)(OH)4 |
O | β Goethite | Ξ±-Fe3+O(OH) |
O | β Hematite | Fe2O3 |
O | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
O | β Jarosite | KFe33+(SO4)2(OH)6 |
O | β Kaolinite | Al2(Si2O5)(OH)4 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
O | β Quartz | SiO2 |
O | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Na | Sodium | |
Na | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
Mg | Magnesium | |
Mg | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
Mg | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Al | Aluminium | |
Al | β Dickite | Al2(Si2O5)(OH)4 |
Al | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
Al | β Kaolinite | Al2(Si2O5)(OH)4 |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
Si | Silicon | |
Si | β Dickite | Al2(Si2O5)(OH)4 |
Si | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
Si | β Kaolinite | Al2(Si2O5)(OH)4 |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
Si | β Quartz | SiO2 |
Si | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
S | Sulfur | |
S | β Aktashite | Cu6Hg3As4S12 |
S | β Chalcopyrite | CuFeS2 |
S | β Christite | TlHgAsS3 |
S | β Cinnabar | HgS |
S | β Jarosite | KFe33+(SO4)2(OH)6 |
S | β Millerite | NiS |
S | β Pyrite | FeS2 |
S | β Pyrrhotite | Fe1-xS |
S | β Realgar | As4S4 |
S | β Sphalerite | ZnS |
K | Potassium | |
K | β Muscovite var. Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
K | β Jarosite | KFe33+(SO4)2(OH)6 |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
Ca | β Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Fe | Iron | |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Goethite | Ξ±-Fe3+O(OH) |
Fe | β Hematite | Fe2O3 |
Fe | β Jarosite | KFe33+(SO4)2(OH)6 |
Fe | β Pyrite | FeS2 |
Fe | β Pyrrhotite | Fe1-xS |
Ni | Nickel | |
Ni | β Millerite | NiS |
Cu | Copper | |
Cu | β Aktashite | Cu6Hg3As4S12 |
Cu | β Chalcopyrite | CuFeS2 |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Aktashite | Cu6Hg3As4S12 |
As | β Christite | TlHgAsS3 |
As | β Realgar | As4S4 |
Au | Gold | |
Au | β Gold | Au |
Hg | Mercury | |
Hg | β Aktashite | Cu6Hg3As4S12 |
Hg | β Christite | TlHgAsS3 |
Hg | β Cinnabar | HgS |
Tl | Thallium | |
Tl | β Christite | TlHgAsS3 |
Other Databases
Link to USGS MRDS: | 10310435 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Antler Foreland BasinBasin
- Basin and Range BasinsBasin
- Mojave DomainDomain
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Cortez Hills underground, Cortez Mining District, Lander County, Nevada, USA