Standard Uranium Returns to Flagship Project; Locks in Drill-Ready Targets at Davidson River

Press Release

Vancouver, British Columbia, May 7, 2026 — Standard Uranium Ltd. (“Standard Uranium” or the “Company”) (TSX-V: STND) (OTCQB: STTDF) (Frankfurt: FWB:9SU0) is pleased to announce that it is in the final stages of planning for the 2026 drill program across the Warrior, Bronco, and Thunderbird conductor corridors at its flagship Davidson River Project (“Davidson River” or the “Project”), located in the southwest Athabasca Basin, Saskatchewan, Canada. The Company is now in the final operational countdown to the first drill program at Davidson River since 2022 with targets confirmed, permits in hand, the Clearwater River Dene Nation (“CRDN”) Exploration Agreement signed, and key contractors secured. The 2026 drill campaign is targeting basement-hosted, high-grade uranium mineralization on the same regional structural trends that host significant uranium deposits including NexGen Energy’s Arrow deposit and Paladin Energy’s Triple R deposit.

Program Highlights

• Drill targets prioritized and locked-in across three of four major conductor corridors at Davidson River – Warrior, Bronco, and Thunderbird – based on the integration of the first-ever ExoSphere Multiphysics surveys completed in the southwest Athabasca Basin region.
• Fully funded with two drill rigs deployed simultaneously to maximize metres and accelerate the testing of the Company’s highest-confidence targets ever generated on the property.
• Mobilization to site: May 31, 2026. Drilling expected to commence shortly thereafter.
• All drill permits secured and CRDN Exploration Agreement signed, formalizing community-aligned exploration on traditional territory.

Drill Targets Finalized — A First-of-its-Kind Multiphysics Campaign in the Southwest Basin

In partnership with Fleet Space Technologies, Standard Uranium completed the first-ever ExoSphere Multiphysics surveys in the southwest Athabasca Basin region, integrating 3D Ambient Noise Tomography (“ANT”), Horizontal-to-Vertical Spectral Ratio (“HVSR”), and ground gravity datasets to generate cover-corrected 3D models of basement velocity, density, and structural architecture across the Warrior, Bronco, and Thunderbird corridors.

The integration of Multiphysics data with prior drill results, ground gravity, EM conductors, and ALS GoldSpot SmartMatch machine-learning targeting has produced what the Company believes are its highest-confidence drill targets ever at Davidson River. Distinct density-low anomalies interpreted as potential indicators of hydrothermal alteration associated with uranium mineralization have been identified across all three surveyed corridors, coincident with mapped EM conductors and basement fault extrapolations.

Figure 1. Overview of Standard Uranium’s Flagship Davidson River Project in the southwest Athabasca Basin uranium district along trend from significant uranium discoveries and resources^1,2.

Target highlights by corridor:

• Warrior Corridor – Wide graphitic structural zones intersected in prior drilling, with elevated radioactivity and dravite alteration. ExoSphere Multiphysics has refined density-low anomalies to a tightly clustered set of priority drill targets.
• Bronco Corridor – Strongly graphitic structures with clay-hematite alteration, and intensely reactivated shear zones. Top priority Multiphysics targets confirmed and ranked for the upcoming program.
• Thunderbird Corridor – Strong iron oxide alteration and elevated radioactivity historically intersected; Multiphysics integration has elevated this corridor to a high-priority drill-ready status.
• Saint Corridor – Targets prioritized for follow-up Multiphysics surveys and a potential 2027 drill campaign.

A Tier-One Geological Address

Davidson River occupies 30,737 hectares across ten contiguous mineral claims along the western extension of the same structural corridors that host the Southwest Athabasca’s most significant uranium discoveries.

The Company believes Davidson River represents a meaningful exploration position along structurally favourable trends, and the next 6 months will be the most catalyst-dense period in Standard Uranium’s history. Anticipated near-term milestones include drill program commencement, first hole completion, rolling assay results across three corridors, and ongoing target refinement, with each a potential value-driving event for the Project.

“Eight years of disciplined work on Davidson River converges in the next four weeks,” said Jon Bey, CEO & Chairman of Standard Uranium. “We have a permitted, fully funded, drill-ready program on a structural trend that the global uranium market has spent the past decade learning to take very seriously. With upgraded drill targets locked in via our 2025 Multiphysics program, two rigs on contract, and our partners at Clearwater River Dene Nation alongside us, Standard Uranium enters the most consequential operational window in our history. For shareholders, the next six months will be defined by drilling and by the steady cadence of news that comes with two rigs turning into our highest-confidence targets ever generated at Davidson River.”

“This is the program we have been building towards,” added Sean Hillacre, P.Geo., President & VP Exploration of Standard Uranium. “The integration of ExoSphere Multiphysics data with our existing drill results, ground gravity, EM conductors, and machine-learning targeting has materially upgraded our understanding of the subsurface at Davidson River. Multiple density-low anomalies, coincident with known graphitic fault zones, give us drill targets across Warrior, Bronco, and Thunderbird that we are very excited to test. Our methodology mirrors the targeting approach that has led to significant discoveries elsewhere in this district, and we are now bringing that toolkit to more than 70 kilometres of prospective strike that has never been tested with this level of integrated science.”

Figure 2. Summary of results from Multiphysics surveys on the Warrior, Bronco, and Thunderbird corridors, highlighting integrated target areas – EM conductors, cross-faults, density lows, and velocity lows.

Qualified Person Statement

The scientific and technical information contained in this news release has been reviewed and approved by Sean Hillacre, P.Geo., President and VP Exploration of the Company and a “qualified person” as defined in NI 43-101 – Standards of Disclosure for Mineral Projects.

Historical data disclosed in this news release relating to sampling results from previous operators are historical in nature. Neither the Company nor a qualified person has yet verified this data and therefore investors should not place undue reliance on such data. The Company’s future exploration work may include verification of the data. The Company considers historical results to be relevant as an exploration guide and to assess the mineralization as well as economic potential of exploration projects. Any historical grab samples disclosed are selected samples and may not represent true underlying mineralization.

Standard Uranium cautions that results or discoveries on properties in proximity to Standard Uranium’s properties may not necessarily be indicative of the presence of mineralization on the Company’s properties.

References

¹ Arrow deposit, Rook I Project, Saskatchewan, NI 43-101 Technical Report on Feasibility Study, Prepared for NexGen Energy Ltd., Effective date: February 22, 2021

² Feasibility Study, NI 43-101 Technical Report, for PLS Property, Prepared for Fission Uranium Corp., Effective date: January 17, 2023

^*The Company considers uranium mineralization with concentrations greater than 1.0 wt.% U₃O₈ to be “high-grade”.

About Standard Uranium (TSX-V: STND)

We find the fuel to power a clean energy future

Standard Uranium is a uranium exploration company and emerging project generator poised for discovery in one of the world’s premier uranium districts. The Company holds interest in over 232,864 acres (94,237 hectares) in the Athabasca Basin in Saskatchewan, Canada. Since its establishment, Standard Uranium has focused on the identification, acquisition, and exploration of Athabasca-style uranium targets with a view to discovery and future development.

Standard Uranium’s Davidson River Project, in the southwest part of the Athabasca Basin, Saskatchewan, comprises ten mineral claims over 30,737 hectares. Davidson River is highly prospective for basement-hosted uranium deposits due to its location along trend from recent high-grade uranium discoveries. However, owing to the large project size with multiple targets, it remains broadly under-tested by drilling. Recent intersections of wide, structurally deformed and strongly altered shear zones provide significant confidence in the exploration model and future success is expected.

Standard Uranium’s eastern Athabasca projects comprise over 42,145 hectares of prospective land holdings. The eastern basin projects are highly prospective for unconformity related and/or basement hosted uranium deposits based on historical uranium occurrences, recently identified geophysical anomalies, and location along trend from several high-grade uranium discoveries.

Standard Uranium’s Sun Dog project, in the northwest part of the Athabasca Basin, Saskatchewan, is comprised of nine mineral claims over 19,603 hectares. The Sun Dog project is highly prospective for basement and unconformity hosted uranium deposits yet remains largely untested by sufficient drilling despite its location proximal to uranium discoveries in the area.

For further information contact:

Jon Bey, Chief Executive Officer, and Chairman

Suite 3123, 595 Burrard Street
Vancouver, British Columbia, V7X 1J1

Tel: 1 (306) 850-6699
E-mail:  info@standarduranium.ca

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