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Round Mountain Mine (Round Mountain Gold Mine; Sunnyside Mine; Sphinx glory hole; Great Western tunnel; Rattlesnake; Keane vein; Los Gazabo vein), Round Mountain, Round Mountain, Round Mountain District, Toquima Range, Nye Co., Nevada, USAi
Regional Level Types
Round Mountain Mine (Round Mountain Gold Mine; Sunnyside Mine; Sphinx glory hole; Great Western tunnel; Rattlesnake; Keane vein; Los Gazabo vein)Mine
Round MountainMountain
Round MountainMountain
Round Mountain DistrictMining District
Toquima RangeMountain Range
Nye Co.County
NevadaState
USACountry

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Latitude & Longitude (WGS84):
38° 42' North , 117° 4' West
Latitude & Longitude (decimal):
Locality type:


An open pit Au-Ag-As-Sb-Th-Hg-Mo-F-Mn-W mine located in secs. 19 & 30, T10N, R44E, MDM, 0.9 km (2,800 feet) SE of Round Mountain (summit) (coordinates of record), and 1.2 km (4,100 feet) S of Round Mountain (town). Owned by Homestake Mining Co. (25%) & Round Mountain Gold Corp.

Workings include an open pit with a heap-leach operation.

Produced 4 million tons ore (= 3,720 kg Au) (1984).

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


14 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Aguilarite
Formula: Ag4SeS
Habit: Probe visible blebs
Description: micrometer blebs in gold and electrum
Reference: Bart Cannon EDS of RWMW specimen
Anatase
Formula: TiO2
Reference: In the collection of Brent Thorne.
Calcite
Formula: CaCO3
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
'Chlorite Group'
Reference: Mineralogical Record 40:105-115
'Electrum'
Formula: (Au, Ag)
Reference: [www.thamesvalleyminerals.com]; Mineralogical Record 40:105-115
Fluorite
Formula: CaF2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Goethite
Formula: α-Fe3+O(OH)
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Gold
Formula: Au
Habit: Flattened & elongated spinel twins to 6cm. Herringbone leaves, parallel wires, cubic crystals.
Colour: Gold
Description: Thumbnail to cabinet size clusters. Found in late 1980's to 2006
Reference: Wilson, W. E. (2009): The Round Mountain mine, Nye County, Nevada. Mineralogical Record, 40:105-115
Hematite
Formula: Fe2O3
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
'K Feldspar'
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Mineralogical Record 40:105-115
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Mineralogical Record 40:105-115
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Mineralogical Record 40:105-115
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Mineralogical Record 40:105-115
Pyrite
Formula: FeS2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Mineralogical Record 40:105-115
Pyrolusite
Formula: Mn4+O2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Quartz
Formula: SiO2
Reference: Woodside collection
Realgar
Formula: As4S4
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Scorodite
Formula: Fe3+AsO4 · 2H2O
Reference: NBMG Spec. Pub. 31 Minerals of Nevada

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Electrum'1.AA.05(Au, Ag)
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Aguilarite2.BA.55Ag4SeS
Pyrite2.EB.05aFeS2
Realgar2.FA.15aAs4S4
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Jarosite7.BC.10KFe3+ 3(SO4)2(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Scorodite8.CD.10Fe3+AsO4 · 2H2O
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

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
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Aguilarite2.4.1.3Ag4SeS
AmXp, with m:p = 1:1
Realgar2.8.21.1As4S4
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Anatase4.4.4.1TiO2
Pyrolusite4.4.1.4Mn4+O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Scorodite40.4.1.3Fe3+AsO4 · 2H2O
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.
'Chlorite Group'-
'Electrum'-(Au, Ag)
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H JarositeKFe3+ 3(SO4)2(OH)6
H Limonite(Fe,O,OH,H2O)
H ScoroditeFe3+AsO4 · 2H2O
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O JarositeKFe3+ 3(SO4)2(OH)6
O K Feldspar (var: Adularia)KAlSi3O8
O PyrolusiteMn4+O2
O Limonite(Fe,O,OH,H2O)
O ScoroditeFe3+AsO4 · 2H2O
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O AnataseTiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
FFluorine
F FluoriteCaF2
AlAluminium
Al K Feldspar (var: Adularia)KAlSi3O8
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si K Feldspar (var: Adularia)KAlSi3O8
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
SSulfur
S RealgarAs4S4
S JarositeKFe3+ 3(SO4)2(OH)6
S PyriteFeS2
S AguilariteAg4SeS
KPotassium
K JarositeKFe3+ 3(SO4)2(OH)6
K K Feldspar (var: Adularia)KAlSi3O8
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca FluoriteCaF2
TiTitanium
Ti AnataseTiO2
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe PyriteFeS2
Fe Limonite(Fe,O,OH,H2O)
Fe ScoroditeFe3+AsO4 · 2H2O
AsArsenic
As RealgarAs4S4
As ScoroditeFe3+AsO4 · 2H2O
SeSelenium
Se AguilariteAg4SeS
AgSilver
Ag Electrum(Au, Ag)
Ag AguilariteAg4SeS
AuGold
Au GoldAu
Au Electrum(Au, Ag)

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

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 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]

Early Miocene - Oligocene
15.97 - 33.9 Ma



ID: 2872205
Intermediate silicic ash flow tuff

Age: Cenozoic (15.97 - 33.9 Ma)

Stratigraphic Name: Bates Mountain Tuff; Caetano Tuff; Edwards Creek Tuff; New Pass Tuff; Fish Creek Mountains Tuff; Fraction Tuff; Pancake Summit Tuff; Northumberland Tuff; Shingle Pass Tuff; Darrough Felsite

Description: Welded and nonwelded silicic ash flow tuffs. Aside from alluvium, this unit covers more of Nevada than any other rock, with over 4,000 polygons representing it on this map. It is principally exposed in the central regions of the State. It locally includes thin units of air fall tuff and sedimentary rocks. It includes rocks mapped on the Washoe South, Lyon, Douglas, and Carson Counties maps as the Hartford Hill Rhyolite Tuff (now abandoned); on the Nye South map as the tuff of White Blotch Spring, the tuffs of Antelope Springs, and the tuff of Monotony Valley; in Lander County it is mapped as the Bates Mountain Tuff, Caetano Tuff, Edwards Creek Tuff, New Pass Tuff, tuff of Hall Creek, and the tuff of McCoy Mine; in Lander and Pershing Counties it is the Fish Creek Mountains Tuff; on both of the Nye County maps it is the Fraction Tuff; it also includes the Pancake Summit Tuff, Northumberland Tuff, Shingle Pass Tuff, some outcrops of Darrough Felsite shown to be Tertiary (other outcrops have been shown to be Mesozoic or Paleozoic), tuffs of Moores station, tuffs of Peavine Canyon, tuffs of the Pancake caldera complex, the Stone Cabin Formation, tuff of Saulsbury Wash, tuff of Kiln Canyon, the Tonopah Formation, tuffs of Hannapah, tuff of Bald Mountain, the Needles Range Formation, and the Calloway Well Formation on the Nye North map; in Esmeralda County it is the Kendall Tuff and latite; and in northern Nye and Lander Counties it is the Toiyabe Quartz Latite (now abandoned), and other unnamed units. It corresponds to unit Tt2 on the 1978 State map. It crops out in every county except Clark.

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:{felsic volcanic}, Minor:{sedimentary}

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

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Mining Annual Review (1985): 326.
Minerals yearbook (1988) - Mining & Quarrying Trends: 31.
Wilson, W. E. (2009): The Round Mountain mine, Nye County, Nevada. Mineralogical Record: 40: 105-115.
Werschky, R. S. (2011). Kristallines Gold vom Round Mountain, Nevada, USA. Mineralien Welt. 22(4): 14-27.
Nevada Bureau of Mines and Geology Special Publication 31, Minerals of Nevada.

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