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Anaconda Mine (Uncle Sam Mine; Cloverleaf Mine), Roubaix, Galena District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 16' 27'' North , 103° 40' 0'' West
Latitude & Longitude (decimal): 44.27444,-103.66672

Ref: "The Mines Around and Beyond". Joel K. Waterland, 1991, pp 179 - 189. Located in 1878 and mined for gold-bearing quartz. Operated by shaft and whim feeding a single-stamp mill until 1884, when a 25-stamp mill was completed. Expanded again in 1885 with an additional 60-stamp mill.

Temporarily closed in 1886 due to investor financial difficulties.

By 1888, the large volume of ground water required installation of a 1,500 gallon per minute Cornish Pump. However, the mine closed in 1890 due to excessive water. Production from 1878 to 1888 estimated 100,000 tons of ore and 20,000 ounces of gold.

Reopened in 1894 under lease. An additional two Prescott pumps were installed to handle ground water. The shaft was enlarged to three compartments in 1899, reaching depths of 500 feet by 1901 and 700 feet by 1903 with plans to attain 1000 feet.

On June 5, 1905, a collapse "dammed" ground water and the pumps ran dry. While attempting to repair them, the "dam" broke and mine flooded.

Homestake Mining Company obtained a 2-year lease in 1924, but discontinued diamond drilling the same year. Anaconda Mining Company leased the property in 1934. By 1936, they had dewatered the mine, repaired the mill and produced 6,000 tons of ore from the 700 foot level, yielding 274 ounces of gold. The mine was closed in 1937 due to high costs.

Mineral List

8 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

1600 - 2500 Ma

Age: Proterozoic (1600 - 2500 Ma)

Description: Light- to dark-gray, silceous mica schist and impure quartzite. Differentiated where possible into three primary tongues or lenses. (Xgw1, Xgw2, and Xgw3) Thickness from 1,000 ft to over 5,000 ft (305-1,524 m).

Lithology: Major:{mica schist,quartzite}

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]

1600 - 2500 Ma

Age: Proterozoic (1600 - 2500 Ma)

Description: Greenish-gray to grayish-tan siliceous schist. Minor chlorite, garnet, staurolite, or sillimanite in pelitic interbeds at various metamorphic grades. Protoliths are turbidite deposits having readily recognizable Bouma sequences. Calc-silicate ellipsoidal structures develop from carbonate-rich concretions near the garnet isograd. Local discordances within units probably indicate penecontemporaneous slump, but a disconformity is inferred to exist in lower part of unit. Subdivided into units Xgw1, Xgw2, and Xgw3 where possible. Subunits pinch out northwest of Pactola Lake. Includes part of Oreville Formation in Hill City 7.5-minute quadrangle (Ratté and Wayland, 1969). Thickness possibly as much as 2,200 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

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