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Uranium migration and retention during weathering of a granitic waste rock pile.

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Title: Uranium migration and retention during weathering of a granitic waste rock pile.
Authors: Boekhout, F.1 floraboekhout@hotmail.com, Gérard, M.1, Kanzari, A.1, Michel, A.2, Déjeant, A.1, Galoisy, L.1, Calas, G.1, Descostes, M.3
Source: Applied Geochemistry. Jul2015, Vol. 58, p123-135. 13p.
Subjects: Migration of uranium, Weathering, Granite, Uranium mining, Mine waste, Precipitation (Chemistry)
Abstract: This study investigates the post-mining evolution of S-type granitic waste rocks around a former uranium mine, Vieilles Sagnes (Haute Vienne, NW Massif Central, France). This mine was operated between 1957 and 1965 in the La Crouzille former world-class uranium mining district and is representative of intra-granitic vein-type deposits. 50 years after mine closure and the construction and subsequent re-vegetation of the granitic waste rock pile, we evaluate the environmental evolution of the rock pile, including rock alteration, neo-formation of U-bearing phases during weathering, and U migration. Vertical trenches have been excavated through the rock pile down to an underlying paleo-soil, allowing the investigation of the vertical differentiation of the rock pile and its influence on water pathways, weathering processes and U migration and retention. Arenization dominantly drives liberation of U, by dissolution of uraninite inclusions in the most alterable granitic minerals (i.e. K-feldspar and biotite). Retention of U in the matrix at the base of the waste rock pile, and in the underlying paleo-soil most likely occurs by precipitation of (nano-) uranyl phosphates or a combination of co-precipitation and adsorption reactions of U onto Fe (oxy)hydroxides and/or clay minerals. Even though U-migration was observed, U is retained in stable secondary mineral phases, provided the current conditions will not be modified. [ABSTRACT FROM AUTHOR]
Copyright of Applied Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 102592168
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Uranium migration and retention during weathering of a granitic waste rock pile.
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  Data: <searchLink fieldCode="AR" term="%22Boekhout%2C+F%2E%22">Boekhout, F.</searchLink><relatesTo>1</relatesTo><i> floraboekhout@hotmail.com</i><br /><searchLink fieldCode="AR" term="%22Gérard%2C+M%2E%22">Gérard, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kanzari%2C+A%2E%22">Kanzari, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Michel%2C+A%2E%22">Michel, A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Déjeant%2C+A%2E%22">Déjeant, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Galoisy%2C+L%2E%22">Galoisy, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Calas%2C+G%2E%22">Calas, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Descostes%2C+M%2E%22">Descostes, M.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Geochemistry%22">Applied Geochemistry</searchLink>. Jul2015, Vol. 58, p123-135. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Migration+of+uranium%22">Migration of uranium</searchLink><br /><searchLink fieldCode="DE" term="%22Weathering%22">Weathering</searchLink><br /><searchLink fieldCode="DE" term="%22Granite%22">Granite</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium+mining%22">Uranium mining</searchLink><br /><searchLink fieldCode="DE" term="%22Mine+waste%22">Mine waste</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink>
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  Data: This study investigates the post-mining evolution of S-type granitic waste rocks around a former uranium mine, Vieilles Sagnes (Haute Vienne, NW Massif Central, France). This mine was operated between 1957 and 1965 in the La Crouzille former world-class uranium mining district and is representative of intra-granitic vein-type deposits. 50 years after mine closure and the construction and subsequent re-vegetation of the granitic waste rock pile, we evaluate the environmental evolution of the rock pile, including rock alteration, neo-formation of U-bearing phases during weathering, and U migration. Vertical trenches have been excavated through the rock pile down to an underlying paleo-soil, allowing the investigation of the vertical differentiation of the rock pile and its influence on water pathways, weathering processes and U migration and retention. Arenization dominantly drives liberation of U, by dissolution of uraninite inclusions in the most alterable granitic minerals (i.e. K-feldspar and biotite). Retention of U in the matrix at the base of the waste rock pile, and in the underlying paleo-soil most likely occurs by precipitation of (nano-) uranyl phosphates or a combination of co-precipitation and adsorption reactions of U onto Fe (oxy)hydroxides and/or clay minerals. Even though U-migration was observed, U is retained in stable secondary mineral phases, provided the current conditions will not be modified. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Applied Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.apgeochem.2015.02.012
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 123
    Subjects:
      – SubjectFull: Migration of uranium
        Type: general
      – SubjectFull: Weathering
        Type: general
      – SubjectFull: Granite
        Type: general
      – SubjectFull: Uranium mining
        Type: general
      – SubjectFull: Mine waste
        Type: general
      – SubjectFull: Precipitation (Chemistry)
        Type: general
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      – TitleFull: Uranium migration and retention during weathering of a granitic waste rock pile.
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              Text: Jul2015
              Type: published
              Y: 2015
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