Eastern Athabasca Basin, Saskatchewan, Canada
Unconformity related basement hosted uranium
- The East Rim project straddles the eastern margin of the Athabasca Basin 8 kilometres south of the West Bear Uranium-Nickel-Cobalt Deposit
- The project comprises 12 claims totaling 25,111 hectares.
IsoEnergy’s East Rim property staddles the southeastern edge of the Athabasca Basin and is underlain by both the Athabasca Sanstone and by basement rocks of the Wollaston Domain. Quaternary overburden consists of a thin layer of ablation till. The property area is covered by glaciofluvial sands and gravel in the form of eskers, and moraines. Below the overburden, approximately 60% of the property is underlain by Athabasca sandstone which unconformably overlies Paleoproterozoic basement rocks. The remainder of the property lacks sandstone cover and is directly underlain by Wollaston Group rock beneath glacial till (where present).
2023 exploration activities on the East Rim property successfully advanced the project to a near drill-ready state. Data inversion of previous airborne surveys identified several magnetic and density lows, indicating potential for basement-style uranium mineralization. VTEM airborne surveying identified broad conductive zones in the western and south-western portions of the property, and ANT surveying identified an abrupt velocity anomaly within the more southern conductive zone.
Further work is warranted on the property, including interpretation and possible inversion of 2023 VTEM data. Ground geophysics is also recommended to identify discrete conductivity anomalies and generate drill targets, followed by diamond drilling if warranted.
Geotech Ltd conducted a helicopter-borne Versatile Time Domain Electromagnetic (VTEM™ Plus) and horizontal magnetic gradiometer geophysical survey at the East Rim project. The survey covered 1,136 line-kilometres. The VTEM™ Plus system is excellent at locating discrete conductive anomalies as well as mapping lateral and vertical variations in resistivity. A conductivity domain outlined by the 2023 VTEM survey, density low anomalies identified by the 2022 Falcon gravity survey, historic ground EM conductors and alteration in historic drill holes are all present in the area of interest. The results of this VTEM survey will be integrated with the magnetic and gravity surveys that were conducted in 2022 to generate basement hosted targets for initial reconnaissance drill testing in 2024. Importantly, the sandstone cover on the property is thin, ranging from no sandstone cover to 265m in previous drilling.
Efforts at the early-stage have continued to focus on basement-hosted targets where multiple layers of geophysical data stack and allow the Company to vector into a potential uranium mineralised system located under this thin cover.