Millennium (Athabasca)
Saskatchewan, Athabasca Basin (eastern part), Canada
UraniumU
- Type
- Basement-hosted Proterozoic unconformity uranium (IAEA class 7.2)
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. Basement-hosted deposit below the unconformity (age of 1850 Ma used); massive ore with very high δ234U (+32.43 ‰) and disseminated ore with very low δ234U (-53 ‰): recent (under 2.5 Myr) uranium remobilisation. Coordinates not published. 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 |
|---|---|---|---|---|
| −0.52 ‰ | 1 | massive S-rich uranium ore Single analysis; per-sample uncertainty not published; sample CX56-3-712; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 84.01 % U, 22.76 µg/g Tl, 81.45 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −0.12 ‰ | 1 | disseminated uranium ore Single analysis; per-sample uncertainty not published; sample CX48-791; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 31.44 % U, 554.86 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 0.21 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample CX56-3-680.5, Millennium; bracketing-only δ238U at +0.13; 238U/235U of 137.865; about -0.39 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.11 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample CX56-3-712, Millennium; bracketing-only δ238U at +0.19; 238U/235U of 137.851; about -0.49 ‰ after removing the 0.60 ‰ offset specific to this study; same sample as Voinot et al. (2024), published at -0.52 ‰. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.36 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample CX48-1-689, Millennium; bracketing-only δ238U at +0.23; 238U/235U of 137.886; about -0.24 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.22 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample CX48-1-695, Millennium; bracketing-only δ238U at +0.27; 238U/235U of 137.867; about -0.38 ‰ after removing the 0.60 ‰ offset specific to this study. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 0.51 ± 0.1 ‰ | 1 | uraninite Single analysis; ± 0.10 ‰ (2 SD, reproducibility); sample CX48-791, Millennium (disseminated mineralisation); bracketing-only δ238U at +0.60; 238U/235U of 137.907; about -0.09 ‰ after removing the 0.60 ‰ offset specific to this study; same sample as Voinot et al. (2024), published at -0.12 ‰. | 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 |
|---|---|---|---|---|
| 32.43 ‰ | 1 | massive S-rich uranium ore Single analysis; per-sample uncertainty not published; sample CX56-3-712; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 84.01 % U, 22.76 µg/g Tl, 81.45 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −53 ‰ | 1 | disseminated uranium ore Single analysis; per-sample uncertainty not published; sample CX48-791; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 31.44 % U, 554.86 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 8 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample CX56-3-680.5, Millennium. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 34 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample CX56-3-712, Millennium; 234U excess: uranium gain within the last 2.5 Myr; Voinot et al. (2024) report +32.43 ‰ on the same sample. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| 2 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample CX48-1-689, Millennium. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| −13 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample CX48-1-695, Millennium. | Uvarova et al. (2014), Variations in the uranium isotopic compositions of uranium ores fr… | |
| −51 ‰ | 1 | uraninite Single analysis; per-sample uncertainty not published; sample CX48-791, Millennium (disseminated mineralisation); 234U deficit: uranium loss within the last 2.5 Myr; Voinot et al. (2024) report -53 ‰ on the same sample. | 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 |
|---|---|---|---|---|
| −5.51 ± 0.8 ε | 1 | massive S-rich uranium ore Single analysis; ± 0.8 (2 SD); sample CX56-3-712; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 84.01 % U, 22.76 µg/g Tl, 81.45 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| 2.3 ± 0.8 ε | 1 | disseminated uranium ore Single analysis; ± 0.8 (2 SD); sample CX48-791; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 31.44 % U, 554.86 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 |
|---|---|---|---|---|
| 0.53 ± 0.1 ‰ | 1 | massive S-rich uranium ore Single analysis; ± 0.1 (2 SD); sample CX56-3-712; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 84.01 % U, 22.76 µg/g Tl, 81.45 µg/g Mo. | Voinot et al. (2024), Tl, Mo and U isotopes in U-ore deposits record Earth's fundamental … | |
| −2.7 ± 0.5 ‰ | 1 | disseminated uranium ore Single analysis; ± 0.5 (2 SD); sample CX48-791; IAEA class 7.2 Basement Hosted (Proterozoic unconformity); average age used 1850 Ma; 31.44 % U, 554.86 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
- Athabasca basin (unconformity uranium province) Canada
- Shea Creek (Athabasca) Canada
- Tim Mersoï basin (Arlit, Akouta, Imouraren) Niger
- Inkai (Chu-Sarysu basin) Kazakhstan
- Tulukuevskoye Russia
- Ty Gallen France
- Rophin France
- Key Lake (Deilmann and Gaertner) Canada
Cite this page
IsoFind Atlas (2026). Millennium (Athabasca), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/millennium-athabasca/ (accessed 2026-10-16).
@misc{isofind2026millenniumathabascaisotopesig,
title = {Millennium (Athabasca), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/millennium-athabasca/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16