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Approche quantitative par spectrométrie Vis-NIR des minéraux argileux et uranifères dans les sables du gisement de Tortkuduk, Kazakhstan

Abstract : Uranium roll-front type sandstone-hosted deposits from Kazakhstan account for about 13% of the worldwide uranium reserve in 2015. Clay minerals occur at every step of the mining cycle and recently begun to be considered by mining companies.The proportions and distribution of these clay minerals in the sediments at the roll-front deposit scale could improve the exploration, exploitation and rehabilitation of such uranium deposits.Several methods were developed to identify and quantify minerals using a portable near-infrared spectrometer, a convenient and fast analytical tool for use in the field. These methods were calibrated with the help of a wide spectral database and the conception of artificial sands.The clay mineral content, and more importantly, the smectite content can be obtained from a single spectral measurement. It enables the detection of smectite-rich areas to optimise the uranium extraction process where they occur. Combination of the methods provide a mapping tool for clay minerals at the ore deposit scale, yielding information about its actual geometry and formation.Uranium ore bodies migration was observed at the ore deposit scale with the use of the electron paramagnetic resonance spectroscopy. Crystalline radiation induced defects in clay minerals that were in close contact with uranium showed records of the past migration.
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Benoit Hebert. Approche quantitative par spectrométrie Vis-NIR des minéraux argileux et uranifères dans les sables du gisement de Tortkuduk, Kazakhstan. Géochimie. Université de Poitiers, 2018. Français. ⟨NNT : 2018POIT2268⟩. ⟨tel-02008907⟩

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