McArthur River (Athabasca)
Saskatchewan, eastern Athabasca Basin, Canada
UraniumU
- Type
- Unconformity-type uranium (Athabasca type)
World's largest high-grade uranium deposit; finely crystalline disseminated and massive uraninite dated at 1330 ± 3 Ma, homogeneous 238U/235U ratio (0.12 ‰ variation) according to Chernyshev et al. (2014). Not to be confused with the Australian Zn-Pb deposit of the same name. Indicative coordinates.
238U/235U isotope ratio, no unit Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 137.796 ± 0.0064 | 137.789 / 137.805 | 5 | finely crystalline disseminated and massive uraninite (9079/22) Mean and standard deviation recalculated from 5 analyses, 2SD 0.010 to 0.012; equivalent δ238U -0.35 to -0.23 ‰. | Chernyshev et al. (2014), 238U/235U isotope ratio variations in minerals from hydrotherma… |
Deposits of the same type
- Key Lake (Deilmann and Gaertner) Canada
- Athabasca basin (unconformity uranium province) Canada
- Shea Creek (Athabasca) Canada
- Echo Bay (Port Radium) Canada
- Billiken Lode (Critchell area) United States
- Marshall Pass district United States
- Happy Jack Mine (White Canyon) United States
- Skyline Mine (Monument Valley) United States
Cite this page
IsoFind Atlas (2026). McArthur River (Athabasca), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/mcarthur-river-athabasca/ (accessed 2026-10-15).
@misc{isofind2026mcarthurriverathabascaisotope,
title = {McArthur River (Athabasca), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/mcarthur-river-athabasca/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15