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Trout Creek/South Bullion deposit, Railroad District, Elko Co., Nevada, USA

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Lock Map
Latitude & Longitude (WGS84): 40° 27' 48'' North , 116° 0' 6'' West
Latitude & Longitude (decimal): 40.46352,-116.00174
GeoHash:G#: 9rjw0q4j5
Locality type:Deposit
Köppen climate type:BSk : Cold semi-arid (steppe) climate

Structure: The Deposit Lies Within The Mesozoic-Age, N- To Nw-Trending Pinon Range Anticline. Tertiary Age Faults Strike Nw And Nne. One Nw-Striking Fault Set Shows Reverse Displacement And Acted As Conduits For Hydrothermal Fluids.

Alteration: Silicification, Hematization. See Geology Comments.

Commodity: The au:ag ratio is about 1: 8.

Deposit type: Carbonate-hosted Au-Ag

Development: No exploration is known to have taken place in the area prior to 1979. The property was staked by l. L. Trease and h. D. Christianson in 1979 on the basis of mineralized jasperoid outcrops. In 1981, amoco minerals drilled 31 vertical reverse circulation holes on 200-400 ft. Centers. The best intercept was 80 ft. Grading 0.032 opt au. A lack of continuity of mineralization over the wide spaced drilling caused amoco to drop the lease. In 1983, freeport minerals co. Leased the property and drilled 8 holes. The best intercept was 40 ft. Grading 0.083 opt au, although the drilling was otherwise discouraging and freeport dropped the lease. Teck acquired the property in 1986 and conducted intensive exploration for one year. Teck then optioned its interest to lord river gold mines, ltd., who continues to fund exploration with teck As operator. Teck/lord river had drilled 32 holes in the area by 1989. In 1989, the property was still in the advanced exploration stage. A soil geochemical survey shows that As displays the most widespread aerial anomalies, with Au occurring As isolated point concentrations. Hg values up to 8100 ppb form thin linear anomalies that are thought to be leakage along structures from mineralization at depth.

Geology: Alteration comments silicification, hematization. Jasperoid is developed along the controlling faults and along the webb formation/devils gate limestone contact. Jasperoid within the fault hosts small veinlets of calcite, quartz, and barite and shows multiple periods of brecciation and silicification. Au and associated elements are closely correlated with the degree of silicification. Hematite occurs with jasperoid and in the devils gate limestone immediately belo W the contact with the webb formation. Geology comments three areas of mineralization have been identified: the southern, central, and northern zones. Only the central and southern zones are known to contain significant thicknesses of ore-grade Au mineralization. Narro W felsic dikes of unknown age outcrop west and south of the deposit but are not known within it.

Rock formation(s): Webb Formation;;;

Ore(s): Au Deposition Occurred In Jasperoid Occupying Two NW-Striking, South-Dipping Reverse Faults And Within Favorable Horizons Of The Webb Formation In The Hanging Walls Adjacent To These Faults.

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

4 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:

Formula: Sb
Formula: As
Formula: BaSO4
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: CaCO3
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: Au
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
Formula: Au
Formula: Fe2O3
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: Hg
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: Ag

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Unclassified Minerals, Rocks, etc.

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
Unclassified Minerals, Rocks, etc.

List of minerals for each chemical element

C CalciteCaCO3
O BaryteBaSO4
O CalciteCaCO3
O HematiteFe2O3
S BaryteBaSO4
Ca CalciteCaCO3
Fe HematiteFe2O3
Ba BaryteBaSO4
Au GoldAu

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 Mississippian - Late Devonian
346.7 - 382.7 Ma

ID: 2976483
Foreland Basin Assemblage - Siltstone, limestone, shale, and sandstone

Age: Paleozoic (346.7 - 382.7 Ma)

Stratigraphic Name: Pilot Shale; Joana Limestone; Chainman Shale; Tripon ; Pass Limestone; Cockalorum Wash Formation; Mercury Limestone; Bristol Pass Limestone

Description: Unit crops out across all of eastern Nevada, generally east of 116 west longitude. It includes rocks mapped primarily as Pilot Shale, Joana Limestone, Chainman Shale, and their equivalents. This also includes the Tripon Pass Limestone in Elko County, the Cockalorum Wash Formation (now abandoned) in northern Nye County, the Mercury and Bristol Pass Limestones in Lincoln County, and some of the rocks mapped as Monte Cristo Limestone in Clark County. While it may be desirable to separate out the different lithologies, they are not well enough differentiated at this regional map scale. The Chainman, Joana and Pilot are grouped in White Pine County, and the Joana and Pilot are grouped in Elko County. The Pilot Shale lies depositionally (both conformably and disconformably) on Upper Devonian carbonate rocks (Dc) and signals a major change in the depositional setting across most of the carbonate platform which has long been attributed to the onset of deformation attributed to the Antler orogeny. The Pilot Shale is generally recognized as carbonaceous shale, overlain by the cliff-forming Joana Limestone. Siliciclastic quartz-bearing grit, chert, quartz sand, and siltstone in a calcareous matrix become increasingly common as the section turns into the Chainman Shale and other equivalent siliciclastic rocks. The sequence is interrupted by disconformities in a number of places, but structural disruption and poor age control hinder determination of the nature of the contacts between the distinct lithologies. Unit MDcl is overlain by unit IPMcl, but there are places where the age and distinction between the units is poorly constrained. In southernmost Nevada, in Clark and southeastern White Pine Counties, Devonian carbonate is overlain by Mississippian carbonate (Mc) with little or no intervening Pilot Shale equivalent and few overlying siliciclastic rocks with western-derived source material. North and west of the area of exposure of unit MDcl, fault-bounded slivers of Lower Mississippian and Upper Devonian platform margin and slope facies rocks with siliciclastic horizons have been grouped into unit MDst and separated from unit MDcl.

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:{siltstone,limestone,shale}, Minor:{sandstone}, Incidental:{chert}

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


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Jackson, P.R., and Ruetz, J.W., (1991), Geology of the Trout Creek Disseminated Gold Deposit, Elko County, Nevada, in Raines, G.L., Et Al, Eds., Geology and Ore Deposits of the Great Basin, the Geological Society of Nevada, Reno, P. 729-734

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