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

Broxton, D.E.

doi:10.2172/6315662

Cited by 6 publications

(9 citation statements)

References 10 publications

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“…Stream-sediment and stream-water geochemical data from the HSSR study (Broxton, 1978(Broxton, , 1979 and from the present study are interpreted on Plate 4a. During the present study, 24 stream-water and 10 stream-sediment anomalies were identified.…”

Section: 5mentioning

confidence: 52%

“…Uranium occurrence 12 has been noted by Broxton (1978). It is within a series of permeable rhyolite-bearing laharic deposits near the base of Tertiary sediments.…”

Section: Uranium Occurrences Twelve Uranium Occurrences Have Been Exa...mentioning

confidence: 99%

“…The distribution of precipitation is very uneven. Usually, in the basins, precipitation is greater during the early summer months and least in the winter (Broxton, 1978).…”

Section: Climatic Conditionsmentioning

confidence: 99%

“…Stream Water and Sediment. A uranium hydrogeochemical and stream-sediment reconnaissance (HSSR) was carried out and interpreted by the Los Alamos Scientific Laboratory (Broxton, 1978(Broxton, , 1979.…”

Section: 5mentioning

confidence: 99%

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Dillon quadrangle, Montana and Idaho

Wodzicki¹,

Krason²

1981

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All geologic conditions in the Dillon Quadrangle (Montana and Idaho) have been thoroughly examined, and, using National Uranium Resource Evaluation criteria, environments are favorable for uranium deposits along fractured zones of Precambrian Y metasediments, in the McGowan Creek Formation, and in some Tertiary sedimentary basins.A 9-m-wide quartz-bearing fractured zone in Precambrian Y quartzites near Gibbonsville contains 175 ppm uranium, probably derived from formerly overlying Challis Volcanics by supergene processes.The Mississippian McGowan Creek Formation consists of uraniferous, black, siliceous mudstone and chert. In the Melrose district it has been fractured by a low-angle fault, and uranium has been further concentrated by circulating ground water in the 2-to 6-m-thick brecciated zones that in outcrop contain 90 to 170 ppm uranium.The Wise River, northern Divide Creek, Jefferson River, Salmon River, Horse Prairie, Beaverhead River, and upper Ruby River Basins are considered favorable for uranium deposits in sandstone. Present are suitable uraniferous source rocks such as the Boulder batholith, rhyolitic flow breccia, laharic deposits, or strongly welded tuffs; permeable sediments, including most sandstones and conglomerates, providing they do not contain devitrified glass; suitable reductants such as lignite, pyrite, or low-Eh geothermal water; and uranium occurrences. 9 probably flowed out into the Horse Prairie, Grasshopper Creek, Jefferson River, and upper Ruby River Tertiary basins. Plutonic Rocks. Four major Laramide batholiths crop out within the Dillon Quadrangle. They are the Boulder batholith, the Idaho batholith, the Pioneer batholith, and the Tobacco Root batholith. All are dominantly quartz monzonitic composition and hypidiomorphic-granular texture. Minor Tertiary intrusions are present, mainly in Idaho.The southern part of the Boulder batholith lies within the quadrangle and consists mainly of quartz monzonite, but also contains gabbro, quartz diorite, granodiorite, granite, and the late-stage differentiates, alaskite, aplite, and pegmatite. The batholith dates 78 to 72 m.y., overlapping the age of the Elkhorn Mountain Volcanics (Robinson and others, 1968). The batholith intrudes pre-Belt gneisses, Belt Supergroup metasediments, Paleozoic-Mesozoic sediments, and Elkhorn Mountain Volcanics. Two radically different models have been proposed for the emplacement of the batholith.

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Section: 5mentioning

confidence: 52%

“…Uranium occurrence 12 has been noted by Broxton (1978). It is within a series of permeable rhyolite-bearing laharic deposits near the base of Tertiary sediments.…”

Section: Uranium Occurrences Twelve Uranium Occurrences Have Been Exa...mentioning

confidence: 99%

“…The distribution of precipitation is very uneven. Usually, in the basins, precipitation is greater during the early summer months and least in the winter (Broxton, 1978).…”

Section: Climatic Conditionsmentioning

confidence: 99%

Section: 5mentioning

confidence: 99%

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Dillon quadrangle, Montana and Idaho

Wodzicki¹,

Krason²

1981

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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).…”

mentioning

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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Maps showing mineral resource assessment for vein and replacement deposits of base and precious metals, barite, and fluorspar, Dillon 1° x 2° quadrangle, Idaho and Montana

Pearson¹,

Trautwein²,

Berger³

et al. 1992

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This report is one of a series of reports that present, chiefly with maps at a scale of 1 :250,000 and 1 :500,000, various aspects of the geology, geochemistry, geophysics, and mineral resources of the Dillon 1 °X2° quadrangle, southwestern Montana and east-central Idaho (fig. 1 ). These studies were made largely under the Conterminous United States Mineral Assessment Program (CUSMAP), the chief purpose of which is to determine the . mineral resource potential of selected quadrangles by means of a multidisciplinary approach. CUSMAP is intended to provide information on mineral resources to assist federal, state, and local governments in formulating minerals policy and land-use policy and to produce sound scientific data that may be of value to private industry and the general public in mineral exploration and development.

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

Cited by 6 publications

References 10 publications

Dillon quadrangle, Montana and Idaho

Dillon quadrangle, Montana and Idaho

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

Maps showing mineral resource assessment for vein and replacement deposits of base and precious metals, barite, and fluorspar, Dillon 1° x 2° quadrangle, Idaho and Montana

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