West McArthur


  • Close to the world’s richest Uranium Mine, Cameco’s McArthur River
  • Adjacent to Fox Lake Deposit, discovered by Cameco in 2013
  • Over $25 million of work successfully identified 7 Target Areas
  • “Pike Zone” – Basement-hosted high-grade uranium discovery made in Summer of 2022 is the main focus of the Company’s recent efforts on the projects
  • Multiple exploration targets remain on property
  • Objective: a large unconformity-basement uranium deposit
  • CanAlaska is 78% owner and operator of Joint Venture with Cameco

West McArthur Presentation Update

3D video animation: West McArthur Uranium Discovery

Location and Ownership

This project is located in the Athabasca Basin in Saskatchewan and lies between 6 and 30 km west of the producing McArthur River mine (225.5 million pounds U3O8 grading 13.5% U3O8 per tonne produced from 2000 to 2012). Cameco’s new Fox Lake deposit (68.1 million lbs at a grade of 7.99% U3O8) is located immediately east of the property which was staked by CanAlaska in 2004 and optioned in April 2007 to Mitsubishi Development Pty Ltd., a subsidiary of Mitsubishi Corporation of Japan. In January 2016, CanAlaska Uranium Ltd bought Mitsubishi’s 50% interest to hold 100% in the West McArthur property. Under an option agreement with Cameco signed in February 2016, drilling confirmed a new zone of high grade uranium mineralization at Grid 5. In late 2018 CanAlaska resumed Operatorship, with Cameco as a 22% JV partner.


  • Historical exploration on the project by Kerr Addison, Cogema, and Cameco includes airborne and ground geophysics, lithogeochemical surveys, and lake sediment surveys covering more than half of the property, documented in over 60 assessment reports. Several Electromagnetic conductors have been identified, some of which have been drilled on adjoining ground. CanAlaska compiled all of this data, both on and off property to create a powerful exploration dataset for this project.
  • From 2005 to 2012, CanAlaska has completed numerous airborne and ground geophysical surveys to locate targets for drilling. Eight main target areas have been defined on the project area, of which four have been drilled. Propsective alteration zones and mineralization were located in all four, with Grid 1 and Grid 5 producing the best results. Grid 5 is located on the Eastern edge of the project and the Grid 5 basement conductor appears to be a continuation of the C10 conductor along which in Cameco’s Fox Lake deposit is hosted. Alteration observed in Grid 5 drill holes are similar to those described in assessment reports from the Fox Lake deposit.
  • Starting in 2016, once the Cameco option was signed, drilling by Cameco focused almost exclusively on Grid 5, tracing the structure that is host to the Fox Lake deposit. These efforts lead to the discovery of a new zone of high-grade uranium mineralization in August of 2017, which the company now refers to as the ‘42 zone’. Over the course of five drill seasons, Cameco continued to evaluate the Grid 5 trend, identifying significant structure and zones of alteration along the trend to the southwest of the ‘42 zone’
  • In 2019, upon formation of the Joint Venture, CanAlaska took over operatorship of the project. Since then, the company has been focused on expanding the footprint of the ‘42 zone’ mineralization as well as evaluating the structures and alteration immediately along strike to the southwest. Multiple drill-ready targets still exist within the grid 5 area.
  • In 2022, the Company announced a new discovery, referred to as the Pike Zone, that consists of high-grade basement hosted uranium mineralization. The Pike Zone is approximately 6 km to the southwest of the ‘42 zone’ along the C10S conductive corridor. The discovery hole, WMA067 intersected 9.0 m @ 2.4% U3O8 over 100 m into the basement, including 6.0 m @ 3.5% U3O8. Additional drillhole results include WMA072-3, which returned several high-grade intersections over a 12.6 metre wide zone, highlighted by 3.98% U3O8 over 2.3 metres from 845.9 metres, which contained a sub-interval of 25.40% U3O8 over 0.3 metres from 846.4 metres The Company has since concentrated it’s efforts on expanding this mineralized zone, as well as developing regional exploration targets along this open mineralized trend..


Basement rocks comprising Archean granitoids and Lower Proterozoic (Trans Hudson) Wollaston and Mudjatik group metamorphic rocks. These metamorphic rocks are composed of supracrustal rocks (psammites, pelites and minor greenstones) and associated intrusions. These are overlain by an estimated 600 to 850 metres of flat-lying Athabasca sandstones and conglomerates.


This project has demonstrated potential for the discovery of high-grade unconformity style and basement-hosted uranium mineralization like Cigar Lake, McArthur River, or Arrow. The area has numerous conductors and faults with act as both conduits and traps for potential uranium mineralization. A number of structures and conductive targets have been identified from the Company’s exploration efforts.


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