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American Express Mine (Rudolph Claims: Winneshiek; Greenough; Chance; Dolphin; Imperial Mine; Costello; Claim: Costello Fraction), Lead District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 22' 49'' North , 103° 46' 45'' West
Latitude & Longitude (decimal): 44.38028,-103.77917
Köppen climate type:Dfb : Warm-summer humid continental climate


Commodities (Major) - Silver, Gold
Deposit Type: Replacement
Development Status: Past Producer
Host Rock Unit: Deadwood Formation, Deadwood Formation, Dolomite Overlies Basal Quartzite


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


2 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 Macrostrat.org

Eocene - Paleocene
33.9 - 66 Ma



ID: 2473449
Trachytic intrusive rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Gray to brown, weathered, commonly aegirine-bearing. Forms sills and laccolithic bodies.

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]

Eocene - Paleocene
33.9 - 66 Ma



ID: 2815448
Trachytic Intrusive Rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Tan to reddish-brown, iron-stained stocks, laccoliths, sills, and dikes of trachyte, quartz trachyte, and alkalic rhyolite. Contains phenocrysts of sanidine, orrthoclase, anorthoclase, aegirine-augite and biotite in a finely crystalline orthoclase-quartz biotite groundmass.

Lithology: Major:{hypabyssal trachyte,hypabyssal quartz trachyte,hypabyssal rhyolite}

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



This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688 P 7.
BALDWIN, G, 1904, BLACK HILLS ILLUS BLACK HILLS MIN. MEN'S ASSO.
STATE MINE INSPECTOR, ANNUAL REPORTS: 1893, 1896, 1915, 1916.

 
Mineral and/or Locality  
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