Hydrogeochemical and stream sediment reconnaissance basic data for Hot Springs NTMS Quadrangle, South Dakota. [NURE program]

Technical Report · Mon Dec 31 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5517442· OSTI ID:5517442

Results of a reconnaissance geochemical survey of the Hot Springs Quadrangle, South Dakota are reported. Field and laboratory data are presented for 340 groundwater and 394 stream sediment samples. Statistical and areal distributions of uranium and possible uranium-related variables are displayed. A generalized geologic map of the survey area is provided, and pertinent geologic factors which may be of significance in evaluating the potential for uranium mineralization are briefly discussed. The groundwater data indicate potential for uranium mineralization in the north central part of the quadrangle. Groundwaters with high uranium concentrations form a ring around the Black Hills. The ring crosses many geological formations, implying that the location of any existing deposits in this area are structurally controlled and that the sources of the uranium are rock units in the Black Hills. Ash-bearing Tertiary units that have since been removed by erosion are thought to have been a source of uranium in this area. The Pierre Shale, a black, marine shale, also produces groundwaters with relatively high uranium concentrations. These groundwaters may only appear to be anomalously high in uranium due to the lithology of black shales. The sediment data indicate that the highest potential for uranium mineralization occurs in and around the Black Hills. Uranium and thorium in stream sediments are concentrated in heavy and resistate minerals. Sediments with high uranium concentrations appear to be derived from igneous rocks in the Black Hills. Sediments with high-to-moderate uranium values are also derived from the Niobrara Marl and Carlile Shale, but the apparently high values may be due to lithology rather than anomalous uranium concentrations.

• Research Organization: Oak Ridge Gaseous Diffusion Plant, TN (USA)
• DOE Contract Number: EY-76-C-13-1664
• OSTI ID: 5517442
• Report Number(s): GJBX-27(80); K/UR-132
• Country of Publication: United States
• Language: English

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