Hydrogeochemical and stream sediment reconnaissance basic data for Rapid City NTMS Quadrangle, South Dakota

Technical Report · Mon Jun 30 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/5234068· OSTI ID:5234068

Results of a reconnaissance geochemical survey of the Rapid City Quadrangle are reported. Field and laboratory data are presented for 417 groundwater and 477 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. Groundwater data indicate that the most promising areas for uranium mineralization are in the central portion of the quadrangle in the Pierre Shale. Three main clusters of groundwater samples with high uranium values occur here. Associated with the high uranium concentrations are high values for calcium, potassium, magnesium, strontium, and specific conductance. Stream sediment data indicate high concentrations of uranium are usually found in the Pierre Shale. Scattered samples occur in the Graneros Shale and in the Paleozoic and Precambrian units of the Black Hills. Arsenic, cobalt, and yttrium are associated with the areas of high uranium concentration. No areas are indicated with strong potential for uranium mineralization.

• Research Organization: Oak Ridge Gaseous Diffusion Plant, TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5234068
• Report Number(s): GJBX-159(80); K/UR-139
• Country of Publication: United States
• Language: English

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