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Hycroft Mine (Crofoot-Lewis Mine; Standard Slag Mine; Crofoot Gold project; Crofoot project; Crofoot Mine; Lewis Mine; Hycroft-Lewis Mine; Brimstone; Gap; Graveyard [Boneyard]; North pit; South Central pit; South Extension pit; Peninsula), Sulphur, Sulphur Mining District, Humboldt Co., Nevada, USAi
Regional Level Types
Hycroft Mine (Crofoot-Lewis Mine; Standard Slag Mine; Crofoot Gold project; Crofoot project; Crofoot Mine; Lewis Mine; Hycroft-Lewis Mine; Brimstone; Gap; Graveyard [Boneyard]; North pit; South Central pit; South Extension pit; Peninsula)Mine
Sulphur- not defined -
Sulphur Mining DistrictMining District
Humboldt Co.County
NevadaState
USACountry

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Key
Latitude & Longitude (WGS84):
40° 52' 8'' North , 118° 41' 16'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Humboldt119 (2011)47.1km


A Ag-Hg-Cu-Al-Au-S-Se-Zn-Sb mine located in secs. 25 & 36, T35N, R29E, MDM, 4.2 km (2.6 miles) E of Sulphur, on Bureau of Land Management administered land.

Initially, the Crofoot and Lewis mines reflected different ownership of portions the same continuously mineralized zone. Hycroft Resources acquired the Lewis mine in January 1987 and has since consolidated the two mines into the Crofoot/Lewis mine. This gold mine has been described in many earlier MRDS records: W700587, M242949, W700582, M242768, and M242743. The current record combines all information from the earlier records and supersedes those records. These earlier records should be deleted. In addition, there are several records that describe the sulfur, clay, and mercury deposits associated with the same system (D002144, M232693, and others) which should remain in the database.Initially, the Crofoot and Lewis mines reflected different ownership of portions the same continuously mineralized zone. Hycroft Resources acquired the Lewis mine in January 1987 and has since consolidated the two mines into the Crofoot/Lewis mine. This gold mine has been described in many earlier MRDS records: W700587, M242949, W700582, M242768, and M242743. The current record combines all information from the earlier records and supersedes those records. These earlier records should be deleted. In addition, there are several records that describe the sulfur, clay, and mercury deposits associated with the same system (D002144, M232693, and others) which should remain in the database.

The mine is situated off the NW flank of the Kamma Mountains. The current Crofoot/Lewis Mine is developed on a continous mineralized zone that was originally covered by Standard Slag's Lewis mine, on the north and by the Crofoot property to the south. The claims cover 12,230 acres (4,950 hectares).The mine is situated off the NW flank of the Kamma Mountains. The current Crofoot/Lewis Mine is developed on a continous mineralized zone that was originally covered by Standard Slag's Lewis mine, on the north and by the Crofoot property to the south. The claims cover 12,230 acres (4,950 hectares).

Mineralization is an epithermal vein deposit (Mineral occurrence model information: Model code 150; USGS model code 25c; Deposit model name: Epithermal vein, Comstock; Mark3 model number 16), hosted in rocks of the Sulphur group (aphanitic volcanic rocks, agglomerate) and the Camel Conglomerate. The ore body is disseminated, blanket in form with a length of 4,827.9 meters, strikes NE (faults) and dips steeply (faults). Controls for ore emplacement included structure and host-rock permeability. The NNE-trending central fault zone and related splays are mineralized continuously over a distance of 2.5 miles. The system is enriched in Ag southward and with depth, e.g. Ag:Au 4:1 to 10:1. Base metals increase with depth and As, Sb, and Hg decrease with depth. The system is high in Se.

There are two major types of alteration recognized at Sulphur: solfataric-near surface alteration by hot water, gases, acids; and silica-pyrite-(silica-alunite) characterized by dense siliceous flooding accompanied by fine-grained sulfides, formed at moderate depth. Alteration varies from intense silica-adularia-pyrite to weak propylitic with a widespread cap of late "acid-leach alteration," which appears to have descended along pre-existing structures. Local rocks include Tuffaceous sedimentary rocks.

Workings include surface openings comprised of an open pit. The property is developed as an open pit mine; with heap leach operation; single bench; and cyanidation facilities.

Reserves of the Crofoot/Lewis mine were reported in 1988 as 25 million tons of ore grading 0.025 opt Au. In 1991, reported reserves were 33 million tonnes of ore at 0.29 oz/t gold with a waste: ore stripping ratio of 1.6. There was an additional 7 million tons of reserves as refractory unoxidized material. In 1999, 23.8 million tons of ore grading 0.0204 opt Au - proven and probable reserves and 2.3 million tons, 0.0177 opt Au indicated reserves. Vista Gold in about 2000 indicated resources of approximately 25 million tons of ore at .021 opt Au, or about a half million ounces. In 2004, Vista Gold reported measured and indicated reserves of 41,865,000 tons grading 0.0196 opt gold for 819,000 contained ounces; and an inferred resource of 14,108,000 tons grading 0.0152 opt gold for 213,000 contained ounces. 2006 proven and probable reserves were reported as 33,320,000 tons of ore grading 0.02 ounces of gold per ton. Reported production for the Crofoot/Lewis Mine: 1988: 75,800 oz Au 1989-98: 868,544 oz Au, and 2,717,170 oz Ag 1999: 40,075 oz Au, 183,190 oz Ag 2000: 13,493 oz Au, 38,418 oz Ag 2001: 3,232 oz Au, 2,000 Ag 2002: 1,771 oz Au, 217 oz Ag totaling slightly over a million ounces of gold and 2.94 million ounces of silver between 1988 and 2002.

Sporadic mining activity has occurred in this area since about 1875, with early activity focused on sulfur, mercury and clay, and later silver and gold. This district was explored for precious metals by various companies in the 1970s through the 1980s. In 1981 Homestake did widely spaced drilling on 600 ft centers, and intersected deep silver values indicating 10-15 million s.t. of low grade mineralization at shallow depth. Homestake continued their exploration in 1982. This deposit was developed by Standard Slag as the Lewis Mine in 1984, employing about 150 workers. In 1985, Granges put down 12 RC holes, 6 of which were fill-in holes in the North zone adjoining the Lewis Mine, which confirmed Homestake's earlier results. Metallurgical results were encouraging enough to justify accelerating the program. In 1985, a 25-hole, 4000-ft RC. drilling program was in progress, 10 holes to be drilled in the central zone and 10-15 in the relatively unknown southern half of the property, which covers 3600 acres total. In October of 1991, the mine was producing at a rate of 45,000 tpd, 6 days a week. The mine was still listed as an active open pit heap leach gold-silver mine as of 2002, employing 7 persons. Mining in the Brimstone deposit was suspended in December 1998, pending better gold prices. Since that time the site has been on care and maintenance and all operating permits and mining claims have been maintained. Gold recovered from recirculating leach pad solutions has helped to defray holding costs. The owners, Vista Gold, completed a new feasibility study in about 2000 indicating resources of approximately 25 million tons of ore at .021 opt Au, or about a half million ounces. In August 2004, Vista Gold Corp. announced an updated resource estimate for its Hycroft Mine prepared by Mine Development Associates of Reno. The resource estimate, based on a database containing 575 drill holes, credits Hycroft with measured and indicated resources of 754,600 oz Au, and inferred resources of 133,600 oz Au. In 2005, the mine was owned by Vista Gold who recently entered into an option agreement to sell the mine to Canyon Resources.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List

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

36 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Alunite
Formula: KAl3(SO4)2(OH)6
Reference: Econ Geol (1997) 92:578-600
Calcite
Formula: CaCO3
Reference: Econ Geol (1997) 92:578-600
Chalcopyrite
Formula: CuFeS2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Chlorargyrite
Formula: AgCl
Reference: Econ Geol (1997) 92:578-600
'Chlorite Group'
Reference: Econ Geol (1997) 92:578-600
Cinnabar
Formula: HgS
Reference: Econ Geol (1997) 92:578-600
'Electrum'
Formula: (Au,Ag)
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Econ Geol (1997) 92:578-600
Eucairite
Formula: AgCuSe
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Galena
Formula: PbS
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Goethite
Formula: α-Fe3+O(OH)
Reference: Econ Geol (1997) 92:578-600
Gold
Formula: Au
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Gypsum
Formula: CaSO4 · 2H2O
Reference: Econ Geol (1997) 92:578-600
Halite
Formula: NaCl
Reference: NBMG Spec Pub 31 Minerals of Nevada
Hematite
Formula: Fe2O3
Reference: Econ Geol (1997) 92:578-600
Iodargyrite
Formula: AgI
Reference: Econ Geol (1997) 92:578-600
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Econ Geol (1997) 92:578-600; Rye, R. O.; Alpers, C. N. (1997) The stable isotope geochemistry of jarosite. USGS Open-File Report: 97-88
'K Feldspar'
Reference: Econ Geol (1997) 92:578-600; Rye, R. O.; Alpers, C. N. (1997) The stable isotope geochemistry of jarosite. USGS Open-File Report: 97-88
'K Feldspar var: '
Formula: KAlSi3O8
Reference: Econ Geol (1997) 92:578-600; Rye, R. O.; Alpers, C. N. (1997) The stable isotope geochemistry of jarosite. USGS Open-File Report: 97-88
'Leucoxene'
Reference: Econ Geol (1997) 92:578-600
Marcasite
Formula: FeS2
Reference: Econ Geol (1997) 92:578-600
Miargyrite
Formula: AgSbS2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Reference: Econ Geol (1997) 92:578-600
Mordenite
Formula: (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Econ Geol (1997) 92:578-600
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Econ Geol (1997) 92:578-600; Rye, R. O.; Alpers, C. N. (1997) The stable isotope geochemistry of jarosite. USGS Open-File Report: 97-88
Muscovite var:
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Econ Geol (1997) 92:578-600
Muscovite var:
Formula: KAl2(AlSi3O10)(OH)2
Reference: Econ Geol (1997) 92:578-600; Rye, R. O.; Alpers, C. N. (1997) The stable isotope geochemistry of jarosite. USGS Open-File Report: 97-88
Natroalunite
Formula: NaAl3(SO4)2(OH)6
Reference: Econ Geol (1997) 92:578-600
Naumannite
Formula: Ag2Se
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Opal
Formula: SiO2 · nH2O
Description: A and CT varieties.
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Pyrite
Formula: FeS2
Reference: Econ Geol (1997) 92:578-600
Pyrrhotite
Formula: Fe1-xS
Reference: Econ Geol (1997) 92:578-600
Quartz
Formula: SiO2
Reference: Econ Geol (1997) 92:578-600
Quartz var:
Formula: SiO2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Rutile
Formula: TiO2
Reference: Econ Geol (1997) 92:578-600
Selenium
Formula: Se
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Siderite
Formula: FeCO3
Reference: Econ Geol (1997) 92:578-600
'Smectite Group'
Formula: A0.3D2-3[T4O10]Z2 · nH2O
Reference: Econ Geol (1997) 92:578-600
Sphalerite
Formula: ZnS
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Stibnite
Formula: Sb2S3
Reference: Econ Geol (1997) 92:578-600
Stromeyerite
Formula: AgCuS
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Sulphur
Formula: S8
Reference: Econ Geol (1997) 92:578-600; Rye, R. O.; Alpers, C. N. (1997) The stable isotope geochemistry of jarosite. USGS Open-File Report: 97-88
Sylvite
Formula: KCl
Reference: NBMG Spec Pub 31 Minerals of Nevada
Tiemannite
Formula: HgSe
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Tin ?
Formula: Sn
Description: May refer to analytical trace of tin in ore, not native element.
Reference: NBMG Spec Pub 31 Minerals of Nevada

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Electrum'1.AA.05(Au,Ag)
Gold1.AA.05Au
Selenium1.CC.10Se
Sulphur1.CC.05S8
Tin ?1.AC.10Sn
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Chalcopyrite2.CB.10aCuFeS2
Cinnabar2.CD.15aHgS
Eucairite2.BA.50AgCuSe
Galena2.CD.10PbS
Marcasite2.EB.10aFeS2
Miargyrite2.HA.10AgSbS2
Naumannite2.BA.55Ag2Se
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe1-xS
Sphalerite2.CB.05aZnS
Stibnite2.DB.05Sb2S3
Stromeyerite2.BA.40AgCuS
Tiemannite2.CB.05aHgSe
Group 3 - Halides
Chlorargyrite3.AA.15AgCl
Halite3.AA.20NaCl
Iodargyrite3.AA.10AgI
Sylvite3.AA.20KCl
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Opal4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Gypsum7.CD.40CaSO4 · 2H2O
Jarosite7.BC.10KFe3+3(SO4)2(OH)6
Natroalunite7.BC.10NaAl3(SO4)2(OH)6
Group 9 - Silicates
Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Mordenite9.GD.35(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Leucoxene'-
'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O

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
Tin ?1.1.13.1Sn
Semi-metals and non-metals
Selenium1.3.4.1Se
Sulphur1.3.5.1S8
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
Eucairite2.4.6.2AgCuSe
Naumannite2.4.1.2Ag2Se
Stromeyerite2.4.6.1AgCuS
AmXp, with m:p = 1:1
Cinnabar2.8.14.1HgS
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe1-xS
Sphalerite2.8.2.1ZnS
Tiemannite2.8.2.4HgSe
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 2
Miargyrite3.7.3.2AgSbS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 9 - NORMAL HALIDES
AX
Chlorargyrite9.1.4.1AgCl
Halite9.1.1.1NaCl
Iodargyrite9.1.5.1AgI
Sylvite9.1.1.2KCl
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
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
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Sheets of 6-membered rings with 2:1 clays
Montmorillonite71.3.1a.2(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Mordenite77.1.6.1(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Electrum'-(Au,Ag)
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Leucoxene'-
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
Natroalunite-NaAl3(SO4)2(OH)6
Quartz
var: Chalcedony
-SiO2
'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O

List of minerals for each chemical element

HHydrogen
H Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
H OpalSiO2 · nH2O
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H JarositeKFe3+ 3(SO4)2(OH)6
H AluniteKAl3(SO4)2(OH)6
H NatroaluniteNaAl3(SO4)2(OH)6
H GypsumCaSO4 · 2H2O
H Goethiteα-Fe3+O(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
C SideriteFeCO3
OOxygen
O Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
O Quartz (var: Chalcedony)SiO2
O OpalSiO2 · nH2O
O K Feldspar (var: Adularia)KAlSi3O8
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
O QuartzSiO2
O CalciteCaCO3
O SideriteFeCO3
O RutileTiO2
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O JarositeKFe3+ 3(SO4)2(OH)6
O AluniteKAl3(SO4)2(OH)6
O NatroaluniteNaAl3(SO4)2(OH)6
O GypsumCaSO4 · 2H2O
O HematiteFe2O3
O Goethiteα-Fe3+O(OH)
O MuscoviteKAl2(AlSi3O10)(OH)2
NaSodium
Na Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Na HaliteNaCl
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Na NatroaluniteNaAl3(SO4)2(OH)6
MgMagnesium
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
AlAluminium
Al Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Al K Feldspar (var: Adularia)KAlSi3O8
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Al AluniteKAl3(SO4)2(OH)6
Al NatroaluniteNaAl3(SO4)2(OH)6
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Si Quartz (var: Chalcedony)SiO2
Si OpalSiO2 · nH2O
Si K Feldspar (var: Adularia)KAlSi3O8
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si QuartzSiO2
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S GalenaPbS
S SphaleriteZnS
S ChalcopyriteCuFeS2
S MiargyriteAgSbS2
S AcanthiteAg2S
S StromeyeriteAgCuS
S MarcasiteFeS2
S PyriteFeS2
S StibniteSb2S3
S PyrrhotiteFe1-xS
S JarositeKFe3+ 3(SO4)2(OH)6
S AluniteKAl3(SO4)2(OH)6
S NatroaluniteNaAl3(SO4)2(OH)6
S SulphurS8
S GypsumCaSO4 · 2H2O
S CinnabarHgS
ClChlorine
Cl SylviteKCl
Cl HaliteNaCl
Cl ChlorargyriteAgCl
KPotassium
K Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
K SylviteKCl
K K Feldspar (var: Adularia)KAlSi3O8
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K JarositeKFe3+ 3(SO4)2(OH)6
K AluniteKAl3(SO4)2(OH)6
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Ca CalciteCaCO3
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Ca GypsumCaSO4 · 2H2O
TiTitanium
Ti RutileTiO2
FeIron
Fe ChalcopyriteCuFeS2
Fe MarcasiteFeS2
Fe PyriteFeS2
Fe SideriteFeCO3
Fe PyrrhotiteFe1-xS
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe HematiteFe2O3
Fe Goethiteα-Fe3+O(OH)
CuCopper
Cu ChalcopyriteCuFeS2
Cu EucairiteAgCuSe
Cu StromeyeriteAgCuS
ZnZinc
Zn SphaleriteZnS
SeSelenium
Se NaumanniteAg2Se
Se EucairiteAgCuSe
Se SeleniumSe
Se TiemanniteHgSe
AgSilver
Ag Electrum(Au,Ag)
Ag NaumanniteAg2Se
Ag EucairiteAgCuSe
Ag MiargyriteAgSbS2
Ag AcanthiteAg2S
Ag StromeyeriteAgCuS
Ag ChlorargyriteAgCl
Ag IodargyriteAgI
SnTin
Sn TinSn
SbAntimony
Sb MiargyriteAgSbS2
Sb StibniteSb2S3
IIodine
I IodargyriteAgI
AuGold
Au GoldAu
Au Electrum(Au,Ag)
HgMercury
Hg TiemanniteHgSe
Hg CinnabarHgS
PbLead
Pb GalenaPbS

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Wallace, Andy (1980), Report for Cordex, Nevada Bureau of Mines and Geology Mining District File 143, Item 11 (unpublished).
Homestake Mining Co. (1983), unpublished report.
A.E.G. Field Trip Guidebook (1984), Sulphur Mining District.
Mine Search Annual (1984-1985), Volume 11: 111, Metals Economics Group, Boulder Co.
Pay Dirt (1984) (April).
Granges Exploration Lts. (1985) Annual Report, Vancouver, British Columbia.
Mining Journal (1985) (6/21/85).
Nevada State Inspector of Mines (1985), Directory of Nevada Mine Operations Active in Calendar Year 1984.
Tingley, J.V. (1985), Field Examination and Sample Analysis (6 Sep 1985).
Bonham, H. F. (1986), Nevada Bureau of Mines and Geology Map 91.
Tooker, E.W. (1986), USGS Bulletin 1646: 142-143.
Bonham, H. F. (1988) in Nevada Bureau of Mines and Geology Mineral Industries - 1987.
Duncan, D. and B. Wigglesworth (1988) Crofoot's Project Joins Nevada's Formidable List of Gold Producers. Mining and Engineering Journal, June, 1988: 40-41.
Beling, D. C., J. Harrington, and B. Wigglesworth (1991), Treating Low-Grade Solutions at the Crofoot Mine. Chapter 22 in GoldOLD '90, ed. by D. M. Hausen. Society of Mining Engineers, AIME: 231-234.
Doebrich, Jeff (1991), USGS Written communication 1991.
Nevada Department of taxation, Mining Division (1991). Hycroft Resources and Development Net Proceeds Tax records. Carson City, Nevada, February, 1991.
Miller, M.S. (1993), Emigrant Trail Study Area, U.S. Bureau of Mines, Open File Report MLA 7-93: 89.
Nevada Bureau of Mines and Geology (1994), Mineral Industries - 1993.
Nevada Division of Minerals (1994).
Ebert, Shane W, Groves, David I, Jones, J Kenneth (1995), Geology, alteration, and ore controls of the Crofoot/Lewis Mine, Sulphur, Nevada; a well-preserved hot-spring gold-silver deposit, in Geology and Ore Deposits of the American Cordillera; symposium proceedings, Geological Society of Nevada.
Granges Inc. (1995), 1995 Annual Report, 52 pp.
Granges, Inc. (1995), Form 10-K: 7-8.
Nevada Mines Directory (1995): 11, 24. (1995/1996 ??).
The Mining Record (1995), Production at Crofoot/Lewis Mine (February 22, 1995): 7.
Randol Mining Direcotry (1996-1997), U.S. Mines & Mining Companies: 238.
The Mining Record (1996): 107(42) (October 16, 1996): Pl.
The Mining Record (1996): 107(47) (November 20, 1996): Pl.
The Northern Miner (1996).
Wallace, Andy, Friberg, Robert S. (1996), Geology and mineral deposits of the Sulphur mining district, Humboldt County and Pershing County, Nevada; in Gold and silver deposits of western Nevada, Geological Society of Nevada, Special Publication vol.18, pp.67-76.
Economic Geology (1997): 92: 578-600.
Skillings Mining Review (1997): 86(39):14 (September 27, 1997).
The Mining Record (1997): 108(13) (March 26, 1997): Pl.
Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D. (1998), Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.
Davis, D.A. and J. V. Tingley (1999), Gold and silver resources in Nevada, Nevada Bureau of Mines and Geology Map 120.
Crafford, A.E.J., editor (2003), GSN Road Log 2, Interstate 80 Eastbound, Fernley (Exit 48) to Golconda (Exit 194).
Mine Development Associates (2004) 2004 Report (on website).
Vista Gold Corp. (2004), press release, 9/22/2004.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310408.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0320130636, 0320130498, 0320130476 & 0320130635.

Other Databases

USGS MRDS Record:10310408

Localities in this Region

  • Nevada
    • Humboldt Co.
      • Sulphur Mining District
        • Sulphur
          • Hycroft Mine (Crofoot-Lewis Mine; Standard Slag Mine; Crofoot Gold project; Crofoot project; Crofoot Mine; Lewis Mine; Hycroft-Lewis Mine; Brimstone; Gap; Graveyard [Boneyard]; North pit; South Central pit; South Extension pit; Peninsula)

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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