Groundwater of the Kingsville Dome uranium deposit (baseline and monitoring wells)
South Texas, Coastal Plain (Kleberg County), United States
Groundwater
- Type
- Groundwater
Roll-front deposit in Miocene fluvial sandstones of the Goliad Formation (Texas Coastal Plain), uranium leached from Catahoula Formation tuffs; mined by in situ recovery (ISR) with oxygen by Uranium Resources Inc. Areas KPA1 to KPA3 mined between 1988 and 2010 and all restored (until 2013 for KPA3); sampled in 2011. Across the eight transects, (234U/238U) decreases towards the ore from both oxidising and reducing sides, a sign of an active front and recent U mobility; δ238U decreases towards the reducing zone (down to -3.96), explained by Rayleigh deposition from an increasingly light dissolved U reservoir, with several deposition and dissolution cycles (Placzek et al., 2016). Coordinates not published (map only).
δ238U in ‰ (per mil) Values of the same system
Standard : 238U/235U = 137,794 (Goldmann et al., 2015)
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.99 ± 0.29 ‰ | 1 | water of well BL11 (area KPA1, ore zone, ore extracted, restoration completed) Single analysis; ± 0.29 ‰ (2σ); 70 µg/L U; about -3.3 ‰ relative to CRM 112-A; fraction of U deposited estimated at over 99.9 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.86 ± 0.27 ‰ | 1 | water of well BLEK2 (area KPA1, ore zone, ore extracted, restoration completed) Single analysis; ± 0.27 ‰ (2σ); 1080 µg/L U; about -1.17 ‰ relative to CRM 112-A; fraction of U deposited estimated at over 99.9 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 0.21 ± 0.26 ‰ | 1 | water of well BL1240 (area KPA2, ore zone, ore extracted, restoration completed) Single analysis; ± 0.26 ‰ (2σ); 662 µg/L U; about -0.1 ‰ relative to CRM 112-A. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.77 ± 0.3 ‰ | 1 | water of well BL8505 (area KPA3, ore zone, ore extracted, restoration completed) Single analysis; ± 0.3 ‰ (2σ); 3921 µg/L U; about -1.08 ‰ relative to CRM 112-A; fraction of U deposited estimated at over 99.9 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.43 ± 0.27 ‰ | 1 | water of well MW85b (area KPA3, oxidising zone, monitoring well) Single analysis; ± 0.27 ‰ (2σ); 1 µg/L U; about -0.74 ‰ relative to CRM 112-A; fraction of U deposited estimated at 99 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.11 ± 0.3 ‰ | 1 | water of well MW17 (area KPA1, oxidising zone, monitoring well) Single analysis; ± 0.3 ‰ (2σ); 29 µg/L U; about -0.42 ‰ relative to CRM 112-A; fraction of U deposited estimated at 66 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −3.96 ± 0.72 ‰ | 1 | water of well MW40 (area KPA2, reducing zone, monitoring well) Single analysis; ± 0.72 ‰ (2σ); 6 µg/L U; about -4.27 ‰ relative to CRM 112-A; fraction of U deposited estimated at over 99.9 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −1.47 ± 0.23 ‰ | 1 | water of well MW43 (area KPA2, reducing zone, monitoring well) Single analysis; ± 0.23 ‰ (2σ); 2 µg/L U; about -1.78 ‰ relative to CRM 112-A; fraction of U deposited estimated at over 99.9 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.06 ± 0.38 ‰ | 1 | water of well MW15 (area KPA1, oxidising zone, monitoring well) Single analysis; ± 0.38 ‰ (2σ); 36 µg/L U; about -0.37 ‰ relative to CRM 112-A; fraction of U deposited estimated at 45 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.67 ± 0.75 ‰ | 1 | water of well MW79 (area KPA3, reducing zone, monitoring well) Single analysis; ± 0.75 ‰ (2σ); 75 µg/L U; about -0.98 ‰ relative to CRM 112-A; fraction of U deposited estimated at over 99.9 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| −0.06 ± 0.61 ‰ | 1 | water of well MW21 (area KPA1, oxidising zone, monitoring well) Single analysis; ± 0.61 ‰ (2σ); 162 µg/L U; about -0.37 ‰ relative to CRM 112-A; fraction of U deposited estimated at 47 % (Rayleigh model, α = 0.99954 of Bopp et al., 2010). | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… |
(234U/238U) isotope ratio, no unit Values of the same system
Standard : équilibre séculaire
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.92 ± 0.02 | 1 | water of well BL11 (area KPA1, ore zone, ore extracted, restoration completed) Single analysis; ± 0.02 (2σ); 70 µg/L U; a ratio below 1 reflects recent leaching of U from the ore itself. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 0.87 ± 0.02 | 1 | water of well BLEK2 (area KPA1, ore zone, ore extracted, restoration completed) Single analysis; ± 0.02 (2σ); 1080 µg/L U; a ratio below 1 reflects recent leaching of U from the ore itself. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 0.92 ± 0.02 | 1 | water of well BL1240 (area KPA2, ore zone, ore extracted, restoration completed) Single analysis; ± 0.02 (2σ); 662 µg/L U; a ratio below 1 reflects recent leaching of U from the ore itself. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 0.82 ± 0.02 | 1 | water of well BL8505 (area KPA3, ore zone, ore extracted, restoration completed) Single analysis; ± 0.02 (2σ); 3921 µg/L U; a ratio below 1 reflects recent leaching of U from the ore itself. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 1.02 ± 0.02 | 1 | water of well MW85b (area KPA3, oxidising zone, monitoring well) Single analysis; ± 0.02 (2σ); 1 µg/L U; close to secular equilibrium. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 1.49 ± 0.02 | 1 | water of well MW17 (area KPA1, oxidising zone, monitoring well) Single analysis; ± 0.02 (2σ); 29 µg/L U; 234U excess, typical of waters weathering the host rocks. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 1.3 ± 0.03 | 1 | water of well MW40 (area KPA2, reducing zone, monitoring well) Single analysis; ± 0.03 (2σ); 6 µg/L U; 234U excess, typical of waters weathering the host rocks. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 1.01 ± 0.02 | 1 | water of well MW43 (area KPA2, reducing zone, monitoring well) Single analysis; ± 0.02 (2σ); 2 µg/L U; close to secular equilibrium. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 0.94 ± 0.02 | 1 | water of well MW15 (area KPA1, oxidising zone, monitoring well) Single analysis; ± 0.02 (2σ); 36 µg/L U; a ratio below 1 reflects recent leaching of U from the ore itself. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 0.86 ± 0.05 | 1 | water of well MW79 (area KPA3, reducing zone, monitoring well) Single analysis; ± 0.05 (2σ); 75 µg/L U; a ratio below 1 reflects recent leaching of U from the ore itself. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… | |
| 1 ± 0.04 | 1 | water of well MW21 (area KPA1, oxidising zone, monitoring well) Single analysis; ± 0.04 (2σ); 162 µg/L U; close to secular equilibrium. | Placzek et al. (2016), Uranium isotope composition of waters from South Texas uranium ore… |
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Cite this page
IsoFind Atlas (2026). Groundwater of the Kingsville Dome uranium deposit (baseline and monitoring wells), isotope signatures. https://www.isofind.tech/isotopes/en/sites/nappe-du-gisement-d-uranium-de-kingsville-dome-puits-de-controle-et-de-suivi/ (accessed 2026-10-16).
@misc{isofind2026groundwaterofthekingsvilledom,
title = {Groundwater of the Kingsville Dome uranium deposit (baseline and monitoring wells), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/nappe-du-gisement-d-uranium-de-kingsville-dome-puits-de-controle-et-de-suivi/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16