Cosa Resources Announces Airborne Geophysical Surveys at Ursa, Orion Uranium Projects in Athabasca Basin, Saskatchewan
Vancouver, British Columbia – TheNewswire - May 11, 2023 – Cosa Resources Corp. (CSE:COSA) (“Cosa Resources” or the “Company”) is pleased to announce it has engaged Expert Geophysics Limited (“Expert”) to conduct airborne MobileMT™ surveys at its 100% owned Ursa and Orion uranium projects in the Athabasca Basin.
Magnetotelluric (MT) survey method capable of detecting basement electromagnetic (EM) conductors and anomalous resistivity zones in the sandstone
Planned surveying totals 2,900 line-kilometres to provide property-wide coverage at Ursa and Orion
Modern geophysical dataset will facilitate identification and prioritization of target areas for follow-up
Keith Bodnarchuk, President & CEO, commented: “Cosa’s first pass work at the Ursa and Orion projects demonstrates our commitment to efficiently and effectively exploring these projects for the next major uranium deposit. We are eager to see the results of this survey and work towards drill testing.”
Andy Carmichael, VP of Exploration commented: “Ursa and Orion contain nearly 75 kilometres of combined strike length of highly underexplored magnetic lows hosting EM conductors. With such a large area to explore, MobileMT results will evaluate prospective corridors in their entirety to identify and prioritize key areas for follow-up.”
Approximately 2,900 line-kilometres of MobileMT surveying is planned at Ursa and Orion in summer 2023, with 90% of the work to be completed at Ursa. MobileMT is a modern, helicopter-borne, magnetotelluric (MT) survey system capable of detecting both the basement-hosted EM conductors and sandstone-hosted zones of anomalous resistivity commonly associated with significant Athabasca Basin uranium deposits. MobileMT is capable of resolving resistivity contrasts to depths exceeding 1000 metres, and MT surveys have mapped basement conductors and sandstone alteration zones at both the McArthur River and Shea Creek uranium deposits.
The planned survey is a time- and cost-effective approach to gaining a high-level assessment of the nearly 75 kilometres of underexplored, prospective strike length covered by the properties, and will accelerate exploration through the prioritization of target areas. Surveying is planned to begin in late June and will take approximately three weeks to complete.
Existing geophysical coverage at Ursa comprises a patchwork of historical airborne and ground surveys, most of which were completed between 1978 and 2008. Historical airborne EM surveys generally confirmed that basement-hosted EM conductors are present but lacked the resolution for meaningful interpretation. Historical ground EM surveys also indicate basement EM conductors are present, but follow-up drilling rarely intersected conductive basement units. Despite ineffective targeting, the sparse historical drilling intersected structurally disrupted sandstone and basement, hydrothermal alteration, and weak mineralization. Most notably, drill holes CR-03 and CR-08 intersected up to 0.05% and 0.18% U3O8 uranium in the basement, respectively, which has not been adequately followed up (Figure 2).
The upcoming MobileMT survey will be the first time this portion of the Cable Bay Shear Zone (CBSZ) has been covered by an airborne system capable of imaging the basement well beyond the unconformity. Cosa believes the results will greatly improve the understanding of this regional-scale structural corridor.
The 65 kilometres of the CBSZ covered by Ursa offers a highly prospective, significantly underexplored geological analogue to the geological settings underpinning major current- and past-producing uranium mines in the eastern Athabasca Basin. The depth to the unconformity on the project is estimated to be between 600 and 1000 metres.
Located 15 kilometres northeast of Ursa, Orion covers eight kilometres of a curvilinear zone of low magnetic susceptibility with historical electromagnetic conductors mantling a magnetic high, implying favorable structural complexity. No historical drilling has been completed on the project, and the depth to the unconformity is estimated to be between 750 and 900 metres based on neighboring drilling.
Following receipt of the finalized MobileMT dataset, 3D inversion of the survey results will be completed by third party specialists. Cosa aims to utilize inversion results to guide ground-based EM surveys over high-priority target areas and generate quality targets for subsequent drill testing.
Figure 1 – Cosa’s Eastern Athabasca Portfolio with Prospective Uranium Corridors
Figure 2 – Survey Coverage at Ursa, Orion
About Cosa Resources
Cosa Resources is a Canadian mineral exploration company based in Vancouver, BC and is focused on the exploration of its uranium and copper properties in northern Saskatchewan. The portfolio includes six uranium exploration properties: Ursa, Orion, Castor, Charcoal, Helios, and Astro, totaling 140,677 ha in the eastern and northern Athabasca Basin.
The team behind Cosa Resources has a track record of success in Saskatchewan, with several decades of combined experience in uranium exploration, discovery, and development in the province.
The Company’s disclosure of technical or scientific information in this press release has been reviewed and approved by Andy Carmichael, P.Geo., Vice President, Exploration for Cosa Resources. Mr. Carmichael is a Qualified Person as defined under the terms of National Instrument 43-101. This news release refers to neighboring properties in which the Company has no interest. Mineralization on those neighboring properties does not necessarily indicate mineralization on the Company’s properties.
Keith Bodnarchuk, President and CEO
+1 888-899-2672 (COSA)
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