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Black Tail Gulch, Lead District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 22' 22'' North , 103° 45' 48'' West
Latitude & Longitude (decimal): 44.37298,-103.76342
GeoHash:G#: 9xyhqvcg3
Locality type:Gulch
Köppen climate type:Dfb : Warm-summer humid continental climate
Other/historical names associated with this locality:Blacktail Gulch

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Standard Detailed Strunz Dana Chemical Elements

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1 valid mineral.

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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

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]

1600 - 2500 Ma

ID: 2475958
Metamorphosed older basaltic rocks

Age: Proterozoic (1600 - 2500 Ma)

Description: Greenschist- to amphibolite-facies pillowed tholeiitic basalt flows equivalent to the Hay Creek Greenstone (Bayley, 1972c). Interflows contain gray and black schist or phyllite and lensoid carbonate-facies iron-formation, all commonly carbon-rich or sulfide-rich. Unit repeated by folds west of Nemo area but farther to the west individual flows end in laterally equivalent black shale (unit Xbs1) north of Pactola Lake. Small flows repeated near top of unit Xbs1 south of Pactola Lake. Correlated with chemically similar basalt in Lead area in lower part of Poorman Formation (Hosted and Wright, 1923). Tuff in overlying Ellison Formation at Lead has U-Pb zircon age of 1,974 ± 8 Ma (Redden and others, 1990). Metagabbro sill (Xgbo) along Bogus Jim Creek has U-Pb zircon age of 1,964 ± 15 Ma (Redden and others, 1990) and is inferred to be comagmatic with unit Xbo. Present at two different levels in Bear Mountain dome. Inliers in Harney Peak Granite (unit Xh) are clinopyroxene-bearing amphibole schist. Maximum thickness about 700 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]

1600 - 2500 Ma

ID: 2760975
Metamorphosed Carbonaceous Shale

Age: Proterozoic (1600 - 2500 Ma)

Description: Dark-gray to gray, siliceous biotite phyllite, calcareous biotite phyllite, and schist. Minimum thickness 1,500 ft (457 m).

Lithology: Major:{phyllite,schist}

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, used under Creative Commons Attribution 4.0 License

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