North Shore Intersects Significant Uranium Mineralization in All Phase 1 Drill Holes at Rio Puerco

North Shore Uranium Ltd. (NSU) has released Phase 1 drilling results from 13 vertical rotary holes at its Rio Puerco property in New Mexico. The program comprised a total of 9,274 ft (2,828 m) of drilling. All 13 holes intersected uranium above a 0.02% eU3O8 cutoff and a minimum grade x thickness of 0.30.

Highlighted intervals from the program include: - RP-26-18-39: 27.0 ft at 0.30% eU3O8 - RP-26-18-640: 12.5 ft at 0.33% eU3O8 - RP-26-18-25: 13.0 ft at 0.13% eU3O8 - RP-26-18-233: 7.0 ft at 0.17% eU3O8 - RP-26-18-510: 10.5 ft at 0.11% eU3O8 - RP-26-18-512: 13.0 ft at 0.09% eU3O8 - RP-26-18-691: 16.0 ft at 0.07% eU3O8

All 21 intercepts are located below the water table, a condition viewed as favourable for in-situ recovery. The reported grades are eU3O8 values derived from calibrated downhole gamma logging and have not been verified by chemical assays. Phase 2 drilling is planned for Q4 2026 to support future NI 43-101 resource modelling.

North Shore Uranium Ltd. (NSU) is a micro-cap pre-resource uranium explorer with a market capitalization of roughly C$15 million, whose equity is highly sensitive to drill news. The company has released its first modern drill program results at Rio Puerco, marking the first material result release from the project. These results confirm historical Kerr-McGee gamma anomalies and the continued presence of uranium in the Westwater Canyon member.

The best interval reported is 27 ft at 0.295% eU3O8, a strong sandstone-hosted uranium interval that is thicker at a comparable grade than the historical highlight cited elsewhere, such as 3.4 m at 0.30% eU3O8 in hole 18-25C. However, the program serves as validation-twinning of known historical holes. It does not discover a new zone nor materially expand the known footprint yet, and the Jackpile and Section 24 upside remains untested in this release.

The company has a going-concern flag and only C$3.09 million cash at Q1 2026. A successful first program improves financing optionality and supports the Rio Puerco thesis. The share price has declined from the spring 2026 excitement near C$0.31 back to C$0.17. The market is not clearly pricing a successful validation, which creates room for a positive repricing if the market accepts gamma-only results as credible.

The release is material because it is the first hard drill-validated confirmation and includes a strong high-grade ISR interval.

North Shore Uranium Ltd. (TSXV: NSU; OTCQB: NSUUF) is a pre-revenue uranium explorer listed on the TSX Venture Exchange and the OTCQB. The company’s principal asset is the Rio Puerco property in the Grants Uranium District of New Mexico, which it holds under an option to earn up to 87.5% interest from Resurrection Mining LLC. Additional assets include the Falcon and West Bear uranium properties in Saskatchewan.

Historical resource estimates for Rio Puerco, reported under JORC 2004 standards and not current under NI 43-101, indicate 6.0 million tonnes at 0.09% eU3O8 for 11.4 million pounds of U3O8. The company’s capital structure comprises approximately 88.45 million shares outstanding, with a presentation noting fully diluted shares of approximately 112.4 million.

As of the first quarter of 2026, North Shore Uranium reported C$3.09 million in cash and a working capital position of C$3.11 million. The company recorded a net loss of C$514,503 for the quarter. Management has flagged a going-concern risk, noting that the company may need to undertake further equity raises within the next twelve months.