Shaun T. Brown, Anirban Basu
We use uranium (U) isotope ratios to detect and quantify the extent of natural U reduction in groundwater across a roll front redox gradient. Our study was conducted at the Smith Ranch-Highland in situ recovery (ISR) U mine in eastern Wyoming, USA, where economic U deposits occur in the Paleocene Fort Union formation. To evaluate the fate of aqueous U in and adjacent to the ore body, we investigated the chemical composition and isotope ratios of groundwater samples from the roll-front type ore body and surrounding monitoring wells of a previously mined area. The 238U/235U of groundwater varies by approximately 3 ‰ and is correlated with U concentrations. Fluid samples down-gradient of the ore zone are the most depleted in 238U and have the lowest U concentrations. Activity ratios of 234U/238U are ~5.5 up-gradient of the ore zone, ~1.0 in the ore zone, and between 2.3 and 3.7 in the down-gradient monitoring wells. High-precision measurements of 234U/238U and 238U/235U allow for development of a conceptual model that evaluates both the migration of U from the ore body and the extent of its concentration between the ore zone and the down-gradient sampling location.
@article{8d067f12-d06e-447c-8564-28b23717df5c,
title={Isotopic Evidence for Reductive Immobilization of Uranium Across a Roll-Front Mineral Deposit.},
author={Shaun T. Brown and Anirban Basu},
year={2016},
language={en}
}TY - JOUR TI - Isotopic Evidence for Reductive Immobilization of Uranium Across a Roll-Front Mineral Deposit. AU - Shaun T. Brown AU - Anirban Basu PY - 2016 LA - en ER -
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