Eagle-Ace (Beaverlodge district)
Saskatchewan, Beaverlodge district (Uranium City), Canada
UraniumU
- Type
- Monometallic uraninite veins in metamorphic rocks (IAEA class 6.2.1)
Uranium ore sample from the Queen's University collection analysed by Voinot et al. (2024) for U, Mo and Tl; ε205Tl and δ238U decrease together in metamorphic and unconformity deposits (U reduction and Tl redox change), whereas δ97Mo is strongly modified by late remobilisation. Uraninite veins of the Beaverlodge district (age of 2290 Ma used). Indicative coordinates (Uranium City). Uvarova et al. (2014): δ238U (normalisation offset by about +0.60 ‰) and δ234U of samples from the Queen's University collection (Table 2).
δ238U in ‰ (per mil) Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.23 ‰ | 1 | uranium ore Single analysis; per-sample uncertainty not published; sample EA301 Eagle Ace deposit; IAEA class 6.2.1. Monometallic veins (metamorphic); average age used 2290 Ma; 46.82 % U, 9.73 µg/g Tl, 31.28 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 0.38 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample EA3010, Eagle Ace deposit; bracketing-only δ238U at +0.38; 238U/235U of 137.889; about -0.22 ‰ after removing the 0.60 ‰ offset specific to this study; same sample as Voinot et al. (2024), published at -0.23 ‰; recorded as EA301 by Voinot et al. (2024). | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.47 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample Eagle Ace Pitch 8208, Eagle Ace deposit (breccia); bracketing-only δ238U at +0.38; 238U/235U of 137.902; about -0.13 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… |
δ234U in ‰ (per mil) Values of the same system
Standard : équilibre séculaire
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −7.91 ‰ | 1 | uranium ore Single analysis; per-sample uncertainty not published; sample EA301 Eagle Ace deposit; IAEA class 6.2.1. Monometallic veins (metamorphic); average age used 2290 Ma; 46.82 % U, 9.73 µg/g Tl, 31.28 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 75 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample EA3010, Eagle Ace deposit; 234U excess: uranium gain within the last 2.5 Myr; Voinot et al. (2024) report -7.91 ‰ on the same sample; recorded as EA301 by Voinot et al. (2024). | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| −6 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample Eagle Ace Pitch 8208, Eagle Ace deposit (breccia). | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… |
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −1.91 ± 0.8 ε | 1 | uranium ore Single analysis; ± 0.8 (2 SD); sample EA301 Eagle Ace deposit; IAEA class 6.2.1. Monometallic veins (metamorphic); average age used 2290 Ma; 46.82 % U, 9.73 µg/g Tl, 31.28 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … |
δ97Mo in ‰ (per mil) Values of the same system
Standard : NIST SRM 3134
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.13 ± 0.1 ‰ | 1 | uranium ore Single analysis; ± 0.1 (2 SD); sample EA301 Eagle Ace deposit; IAEA class 6.2.1. Monometallic veins (metamorphic); average age used 2290 Ma; 46.82 % U, 9.73 µg/g Tl, 31.28 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … |
Deposits of the same type
- Ace-Fay (Beaverlodge district) Canada
- Shea Creek (Athabasca) Canada
- Athabasca basin (unconformity uranium province) Canada
- Key Lake (Deilmann and Gaertner) Canada
- McArthur River (Athabasca) Canada
- Echo Bay (Port Radium) Canada
- Kiggavik Canada
- Dawn United States
Cite this page
IsoFind Atlas (2026). Eagle-Ace (Beaverlodge district), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/eagle-ace-district-de-beaverlodge/ (accessed 2026-10-16).
@misc{isofind2026eagleacebeaverlodgedistrictis,
title = {Eagle-Ace (Beaverlodge district), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/eagle-ace-district-de-beaverlodge/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16