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Spearfish, Trojan District, Lawrence Co., South Dakota, USAi
Regional Level Types
Spearfish- not defined -
Trojan DistrictMining District
Lawrence Co.County
South DakotaState
USACountry

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Latitude & Longitude (WGS84): 44° 29' 26'' North , 103° 51' 33'' West
Latitude & Longitude (decimal): 44.49082,-103.85937
GeoHash:G#: 9xyjhe7cv
Köppen climate type:Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Spearfish11,283 (2017)0.0km
North Spearfish2,285 (2017)3.1km
Saint Onge191 (2017)12.6km
Central City130 (2017)15.5km
Deadwood1,258 (2017)16.3km


No description has been added for this locality. Can you add one?

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

3 valid minerals.

Detailed Mineral List:

Gold
Formula: Au
Reference: R&M 75:3 pp 156-169
Silver
Formula: Ag
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Sylvanite
Formula: (Au,Ag)2Te4
Reference: Rocks & Min.: 60: 111.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Sylvanite2.EA.05(Au,Ag)2Te4

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 = 1:2
Sylvanite2.12.13.3(Au,Ag)2Te4

List of minerals for each chemical element

AgSilver
Ag Sylvanite(Au,Ag)2Te4
Ag SilverAg
TeTellurium
Te Sylvanite(Au,Ag)2Te4
AuGold
Au Sylvanite(Au,Ag)2Te4
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
0 - 2.588 Ma



ID: 2965527
Alluvium

Age: Pleistocene (0 - 2.588 Ma)

Description: Clay to boulder-size clasts with locally abundant organic material. Thickness up to 75 ft (23m).

Comments: Original map source: Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey, GM 10, scale 1:500,000.

Lithology: Major:{coarse alluvium,fine alluvium}

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]

Holocene - Pleistocene
0 - 2.588 Ma



ID: 2472915
Alluvial deposits

Age: Pleistocene (0 - 2.588 Ma)

Description: Stream-laid deposits of mud, silt, sand, and gravel. Narrow deposits not shown. Maximum thickness 10 m.

Reference: Redden, J.A., E. DeWitt. Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota. U.S. Geological Survey Scientific Investigations Map 2777. [73]

Permian - Devonian
251.902 - 419.2 Ma



ID: 3190647
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 419.2 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]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

Localities in this Region
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