The Athabasca Basin is a large Paleo- to Mesoproterozoic quartz arenite sandstone basin that occupies most of the northernmost quarter of Sas-katchewan and a smaller portion of northeastern Alberta. The locations of the basin and the uranium discoveries discussed in this paper are shown in Figure 1. The majority of the unconformity-type uranium deposits of the Athabasca Basin are sandstone-hosted and are associated with post-Hudsonian, reactivated graphitic faults within Aphebian metasedimentary gneisses of the Wollaston Domain and the Wollaston-Mudjatik transition zone in the eastern portion of the Athabasca Basin. However, the Shea Creek deposit, consisting of the Anne, Kianna, and Colette zones, occurs in the western portion of the basin and is associated with the transition between the granitic Clearwater Domain and the Lloyd Domain.

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