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Wharf Mine, Bald Mountain District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 20' 54'' North , 103° 50' 18'' West
Latitude & Longitude (decimal): 44.34833,-103.83833
Köppen climate type:Dfb : Warm-summer humid continental climate

A gold mine.

Bald Mountain Mining Company (Trojan Mine; Trojan No. 4; Trojan Mining Company; Reliance Mine; South Dakota Mining Company; Bald Mountain Mine; Bald Mountain Mining Company Mine; Foley Ridge; Foley Mine; Annie Creek; Annie Creek / Foley Ridge; Portland Mining Company; Clinton Project).

Mineral List

35 valid minerals.

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

Eocene - Paleocene
33.9 - 66 Ma

ID: 2749430
Phonolitic Intrusive Rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Gray to greenish-gray sills, laccoliths, and small stocks of phonolite, trachyphonolite, and trachyandesite. Contains phenocrysts of andesine, feldspathoids, aegirine-augite, biotite, and sphene in a finely crystalline plagioclase-biotote-feldsphoid groundmass.

Lithology: Major:{hypabyssal felsic alkaline,hypabyssal trachyte}

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]

Permian - Devonian
252.17 - 419.2 Ma

ID: 3190647
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 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]

Early Ordovician - Late Cambrian
470 - 501 Ma

ID: 2474757
Deadwood Formation

Age: Paleozoic (470 - 501 Ma)

Stratigraphic Name: Deadwood Formation

Description: Glauconitic sandstone, shale, siltstone, and conglomerate. Thickness 0–200 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]

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

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
USGS Mineral Yearbook (1996), Gold.
Loomis, T. (2011), "News from the Black Hills, South Dakota", Mineral News.
Wharf Resources, Inc. and RESPEC (2011), Wharf expansion project, conditional use permit application, Topical Report RSI-2196. 104 pp.
PEDRAZA ROJAS, Johana Margaret, HOLLEY, Elizabeth, WENDLANDT, Richard, PFAFF, Katharina and RASMUSSEN, Hans (2016) Geologic Control on Alteration and Mineralization of the Wharf Mine, South Dakota. Geological Society of America Abstracts with Programs. Vol. 48, No. 7

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