Uranium hydrogeochemical and stream sediment reconnaissance data release for the Montana portion of the Hamilton, Montana/Idaho, NTMS quadrangle

Aamodt, P.L.

doi:10.2172/5129741

1978

DOI: 10.2172/5129741

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Uranium hydrogeochemical and stream sediment reconnaissance data release for the Montana portion of the Hamilton, Montana/Idaho, NTMS quadrangle

P.L. Aamodt¹

Abstract: performed these water analyses. The Research Reactor Group, P-2, led by Merle E. Bunker, was responsible for all of the DNC analyses for uranium.Michael N. Minor and other members of Group P-2 prepared the samples and performed these analyses.The efforts of Jesse M. Cheadle III and Carlotta Mclnteer of the Energy Systems and Statistics Group, Q-12, who were responsible for all data management functions, is also greatly appreciated.

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“…Hamilton (Aamodt, 1978b); Elk City (Broxton, 1978); Dillon (Broxton, 1979); and Bozeman (Bolivar, 1979). Airborne radiometric data for the Butte quadrangle also have been published through the DOE by Texas Instruments, Inc. (1979).…”

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confidence: 99%

Uranium hydrogeochemical and stream sediment reconnaissance data release for the Butte NTMS Quadrangle, Montana, including concentrations of forty-two additional elements

Bolivar¹,

Sandoval²,

Gallimore³

et al. 1980

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NUMBER OF SAMPLES = 1319 MAXIMUM = 153.00 ppm MINIMUM = 0.89 ppm MEAN = 8.12 ppm MEDIAN = 4.99 ppm 280 STANDARD DEVIATION = 9.49 ppm 152 89 88 42 37 38 30 u~i.-.t-M-F-II rIF 100 846 NUMBER OF SAMPLES = 1951 MAXIMUM = 153.00 ppm MINIMUM = 0.53 ppm MEAN = 7.08 ppm MEDIAN= 4.12 ppm 500 STANDARD DEVIATION =8.56 ppm 378 180 96 105 72 5 44 4 108 0 --2 4 6 8 10 12 14 16 18 20 URANIUM (ppm) a. All sediments 400 . * . . . . NUMBER OF SAMPLES = 589 MAXIMUM = 60.82 ppm MINIMUM = 0.53 ppm MEAN-=,4.58 ppm MEDIAN = 3.28 ppm 200 -STANDARD DEVIATION = 4.78 ppm 87 38 -"""14

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confidence: 99%

Uranium hydrogeochemical and stream sediment reconnaissance data release for the Butte NTMS Quadrangle, Montana, including concentrations of forty-two additional elements

Bolivar¹,

Sandoval²,

Gallimore³

et al. 1980

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“…Additional HSSR uranium data have been open filed for the adjacent Bozeman NTMS quadrangle (Bolivar, 1978) and the Montana portion of the Hamilton NTMS quadrangle (Aamodt, 1978b).…”

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Uranium hydrogeochemical and stream sediment reconnaissance of the Dillon NTMS Quadrangle, Montana/Idaho, including concentrations of forty-three additional elements

Broxton¹

1979

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The Los Alamos Scientific Laboratory supervised the collection of 1148 water and 1721 sediment samples from 1796 locations in the Dillon quadrangle, Montana/Idaho, for the US Department of Energy's National Uranium Resource Evaluation program.Samples were collected at a nominal density of one per 10 km 2 except in the Boulder batholith area where the density is approximately one sample per 2 km 2 . Surface waters were taken from flowing streams; ground waters were taken from springs and wells.All water samples were analyzed for uranium and 12 other elements.Sediment samples, collected from streams and springs, were analyzed for uranium, thorium, and 41 additional elements.The uranium contents of water samples range from below the detection limit of 0.02 parts per billion (ppb) to 79.31 ppb.Most water samples having anomalously high uranium contents were collected in areas underlain by felsic rocks of the Boulder, Pioneer, and Idaho batholiths.Other groups of anomalous waters are associated with Belt metasediments in the Beaverhead and Salmon River Mountains and with Tertiary strata in intermontane basins.The uranium contents of sediment samples range between 0.95 and 130.50 parts per million (ppm).Anomalous uranium values are associated with felsic rocks of Cretaceous batholiths and Belt quartzites near the Montana-Idaho border.Samples having uranium contents significantly above local background levels also occur in Tertiary strata adjacent to the anomalous areas in the crystalline terranes.Thorium concentrations in sediment samples range from 3.40 to 351.00 ppm. The average uranium/thorium (U/Th) ratio of samples with <20 ppm uranium is 0.37, whereas samples with uranium concentrations >20 ppm have an average ratio of 1.85.The association of high uranium values with relatively high U/Th ratios may be a useful tool for identifying uranium-enriched terranes.

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Uranium hydrogeochemical and stream sediment reconnaissance data release for the Montana portion of the Hamilton, Montana/Idaho, NTMS quadrangle

Cited by 2 publications

References 0 publications

Uranium hydrogeochemical and stream sediment reconnaissance data release for the Butte NTMS Quadrangle, Montana, including concentrations of forty-two additional elements

Uranium hydrogeochemical and stream sediment reconnaissance data release for the Butte NTMS Quadrangle, Montana, including concentrations of forty-two additional elements

Uranium hydrogeochemical and stream sediment reconnaissance of the Dillon NTMS Quadrangle, Montana/Idaho, including concentrations of forty-three additional elements

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