Typology of Uranium Deposits

Dahlkamp, Franz J.

doi:10.1007/978-3-662-02892-6_5

Cited by 10 publications

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“…Scale bar -5 mm; b photomicrograph in reflected light showing uranium minerals (bright yellow) distributed in the sandstone containing detrital organic matters (denoted as C). Scale bar -20 mm associated with carbonaceous debris and is classified by Dahlkamp (1993) as a detrital carbon-uranium roll-type which is a distinctive class of Phanerozoic sandstone-hosted uranium deposits. Mineralisation was formed in the Oligocene.…”

Section: Discussionmentioning

confidence: 99%

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Sandstone hosted uranium deposits of the Great Divide Basin, Wyoming, USA

Abzalov

Paulson

2012

Applied Earth Science

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The Great Divide basin is located in the southern part of the state of Wyoming in USA. Wyoming is the second largest uranium province in that country after the Colorado Plateau. The Great Divide basin represents an intermontane depression of Tertiary age surrounded by major structural uplifts composed of Precambrian rocks including uraniferous Precambrian granite. The main uranium resources of the Great Divide basin are hosted in the weakly lithified sandstone of the Eocene Battle Spring Formation which terminates the sedimentary sequence at the basin. Uranium occurs in the form of rolls and the tabular mineralisation is usually associated with carbonaceous debris in the host sediments. Because of close spatial relationships between uranium and detrital carbonaceous debris the uranium mineralisation of the Great Divide basin is referred to as detrital carbon-uranium roll-type which is a special class of Phanerozoic sandstone hosted uranium deposits. The deposits of the Great Divide basin contain from 2 to 15 kt of U 3 O 8 each, which occurs as uranium rolls and tabular mineralisation, some of which is fault controlled. Their formation is related to multi-episodic uplifts of the Precambrian basement which is exposed along the margins of the basin.

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Section: Discussionmentioning

confidence: 99%

“…Pervasive oxidation of the host rocks intersects reduced portions of the formation at a high angle forming a tongue shaped front, which is a classic feature of the uranium roll-type deposits (Dahlkamp, 1993).…”

Section: Host Rock Alterationmentioning

confidence: 99%

Sandstone hosted uranium deposits of the Great Divide Basin, Wyoming, USA

Abzalov

Paulson

2012

Applied Earth Science

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“…The resulting angular unconformity between the Cretaceous and Tertiary units is known as the K/T boundary and is important to uranium exploration companies for two reasons. First, the boundary represents a paleotopographic surface of a fluvial system characterized by streams, overbank deposits, and alluvial fan deposits of the Wind River formation that are capped by Cenozoic era volcaniclastic rocks and ash of the White River formation (Bullock & Parnell, 2017;Dahlkamp, 1993). Outcrops within the basin (Figure 3) provide evidence of high energy streams eroding and scouring the underlying Cretaceous beds and depositing cobble to boulder sized sediment, as well as incorporating clay rip-up clasts from the underlying Cretaceous units (Harshman & Adams, 1980;Bullock & Parnell, 2017;Harshman, 1972).…”

Section: Introductionmentioning

confidence: 99%

“…The uranium mineralization within Shirley Basin is classified as a sandstone hosted 'roll front' or chemical cell deposit (Childers, 1978;Dahlkamp, 1993;Harshman, 1962). Roll fronts develop over time from oxygenated meteoric water percolating through the surrounding source rocks of the overlying White River volcanic tuffs and the adjacent granitic rocks of the Shirley, Granite and Laramie Mountains and dissolving uranium and other elements, such as selenium (Se), molybdenum (Mo), and vanadium (V).…”

Section: Introductionmentioning

confidence: 99%

“…Between 1963 and 1970, a thenexperimental mining method called In-Situ Recovery (ISR) was introduced at Shirley Basin to investigate a more cost effective and environmentally friendly mining method (Chenoweth, 1991). ISR mining uses a series of water wells to inject oxygenated water into the host sandstone to dissolve the uranium minerals, usually uraninite and coffinite (Harshman & Adams, 1980;Dahlkamp, 1993). Recovery water wells pump the uranium rich water to the surface, and then to a central processing facility where the uranium bearing water is treated to precipitate the uranium onto specialized polymer resin beads.…”

Section: Introductionmentioning

confidence: 99%

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Paleotopographic influences of the Cretaceous/Tertiary angular unconformity on uranium mineralization in the Shirley Basin, Wyoming

Covington

Kennelly²

2018

Journal of Maps

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The Shirley Basin is a small asymmetric synclinal structure located in northern Carbon County, Wyoming approximately 65 km (40 miles) south of Casper, Wyoming, USA. The basin formed during the Laramide orogeny of the Late Cretaceous to Early Tertiary (78-49 Ma) and contains economically significant uranium deposits. The underlying Cretaceous units form an angular unconformity with the overlying Tertiary units that represents a paleotopographic erosional surface characterized by stream channels and overbank deposits of interbedded sand and clay with some organic detritus. Furthermore, the Cretaceous shales function as the lower confining unit/aquitard for in-situ recovery (ISR) uranium mining, and the overlying Tertiary sandstones host the uranium mineralization.This study maps the K/T boundary in greater detail than previous studies and identifies paleotopographic features that influence sedimentary environments and structures that favor uranium mineralization. Using a larger study region and thousands of historical wells and associated electric logs not available to previous studies, this research identifies unit boundaries and enters them into Golden Software's Surfer and Esri's ArcGIS to construct a detailed structure contour map on the K/T surface. The map delineates paleotopography such as hills and river channels, with the latter showing a strong spatial association with uranium mineralization. Geologists can use these maps to identify thicker host sands and fluvial features which enhance uranium mineralization. Mining companies can reduce operational and exploration costs by drilling in these more favorable areas to efficiently delineate the ore body geometry and develop more accurate mine unit designs that will maximize uranium recovery. ARTICLE HISTORY

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Magnetite‐fluorapatite geochemistry and monazite U–Pb geochronology of the Mohuldih uranium deposit, Singhbhum Shear Zone, eastern India

et al. 2023

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In this study, textural relations coupled with mineral chemistry of hydrothermal magnetite, fluorapatite, monazite and allanite from the Mohuldih uranium deposit in the Singhbhum Shear Zone (SSZ) is used to characterize the nature of the fluid during various events of alteration and uranium precipitation. These minerals have two distinct textural types, the earlier of which are coeval with the uraninite mineralization. The later type formed during subsequent hydrothermal overprint as a result of coupled dissolution‐reprecipitation of earlier fluorapatite and mobilization of light rare earth elements. Uranium‐lead dating of texturally‐constrained hydrothermal monazite grains yields two major concordant age clusters at 1855 ± 7 Ma and 963 ± 10 Ma and several discordant analyses. Two spot analyses furnish concordant ages of 1656 ± 33 Ma and 1438 ± 35 Ma that are identical within error of the 207Pb/206Pb ages (1628–1643 Ma and ca. 1392 Ma) of several discordant data points. Similar ages have been reported by other studies from the rocks of the SSZ and are therefore considered to be geologically meaningful. The oldest age of ca. 1855 Ma obtained from the texturally early core regions of monazite corresponds to the earliest stage of uraninite mineralization. The two main alteration types can be interpreted based on the known metamorphic events in the SSZ. A combination of high‐temperature calcic iron ± sodic and high‐temperature potassic iron alteration accompanied the M1 metamorphic event and the low‐temperature silicification/K‐Al alteration during the M2 metamorphic event. A comparative study between our data on magnetite and fluorapatite compositions with those from global iron oxide‐Cu‐gold (IOCG) and iron oxide‐apatite deposits classifies Mohuldih as an IOCG‐type deposit.

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Typology of Uranium Deposits

Cited by 10 publications

References 0 publications

Sandstone hosted uranium deposits of the Great Divide Basin, Wyoming, USA

Sandstone hosted uranium deposits of the Great Divide Basin, Wyoming, USA

Paleotopographic influences of the Cretaceous/Tertiary angular unconformity on uranium mineralization in the Shirley Basin, Wyoming

Magnetite‐fluorapatite geochemistry and monazite U–Pb geochronology of the Mohuldih uranium deposit, Singhbhum Shear Zone, eastern India

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