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URANIUM NATURAL ATTENUATION DOWNGRADIENT OF AN IN SITU RECOVERY MINE INFERRED FROM A CROSS-HOLE FIELD TEST
Reimus, P.W., M.A. Dangelmayr, J.T. Clay, and K.R. Chamberlain.
Environmental Science and Technology53(13):7483-7493(2019)
A field test conducted at a U in situ recovery site evaluated postmining natural attenuation downgradient of an ore zone. Approximately 1 million liters of water from an ore zone well was injected into an unmined ore zone serving as a proxy for a downgradient aquifer. After 1 year of pumping, ~39% of the injected U(VI) and ~100% of coinjected chloride was recovered. A geochemical/transport model calculated chloride and uranium concentrations at the pumping well and 238U/235U ratios, used to reflect uranium removal via reduction. About 50% of the injected U(VI) was reduced to U(IV), although the reduction capacity in the flow pathways between the injection and production wells was estimated to be nearly exhausted by the end of the test.
Environmental Science and Technology53(13):7483-7493(2019)
A field test conducted at a U in situ recovery site evaluated postmining natural attenuation downgradient of an ore zone. Approximately 1 million liters of water from an ore zone well was injected into an unmined ore zone serving as a proxy for a downgradient aquifer. After 1 year of pumping, ~39% of the injected U(VI) and ~100% of coinjected chloride was recovered. A geochemical/transport model calculated chloride and uranium concentrations at the pumping well and 238U/235U ratios, used to reflect uranium removal via reduction. About 50% of the injected U(VI) was reduced to U(IV), although the reduction capacity in the flow pathways between the injection and production wells was estimated to be nearly exhausted by the end of the test.
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