Mr. Brooke Clements reports

NORTH SHORE EXPANDS LAND POSITION AT RIO PUERCO

North Shore Uranium Ltd. has staked 27 additional mining claims at its Rio Puerco uranium project in northwestern New Mexico. The project now includes 64 adjoining Bureau of Land Management (BLM) claims.

In 2009, a historical uranium resource estimate of 6.0 million tonnes at an average grade of 0.09 per cent eU3O8 (equivalent triuranium octoxide) for 11.4 million pounds of U3O8 was reported for Rio Puerco (the historical resource). Initial review of the historical data suggests the potential for in situ recovery (ISR) mining, the lowest-cost method for producing uranium. The entire historical resource is located on the original 37 Rio Puerco claims (the original claims). Previously completed exploration work suggests that there is potential to expand the reported uranium mineralization on both the original claims and the new claims.

Brooke Clements, president and chief executive officer of North Shore, stated: "North Shore's Rio Puerco project in the Grants uranium district of New Mexico, USA, hosts a significant historical uranium resource with excellent upside. The staking of 27 new claims complements the company's strategy of confirming and expanding upon the scale of uranium mineralization found by previous work done at Rio Puerco while further assessing the potential for ISR uranium recovery."

Rio Puerco work history and historical resource estimates

Uranium was first discovered at Rio Puerco in 1968. The claims covering the discovery were ultimately optioned to Kerr-McGee Corp., which drilled over 1,000 holes. Based on the results of that work, it began the development of the Rio Puerco mine in the 1970s. The uranium mineralization is hosted in sandstone of the Jurassic-aged Morrison formation, host to almost all of the significant uranium deposits in the Grants uranium district, the largest historical uranium-producing area in the United States. The mine was intended to be a room-and-pillar underground mine but was never put into production. Activity ceased after a short trial mining phase due to low uranium prices at the time. The underground mine infrastructure included a 260-metre vertical shaft, ventilation shafts, mining adits and support buildings. The mining shaft remains and road access to the site is excellent.

In 2009, Monaro Mining NL commissioned an independent geological review and resource estimate for Rio Puerco using exploration data generated by Kerr-McGee in the 1960s and 1970s. The data used for the resource estimate consisted of historical maps and data from 764 drill holes, including downhole gamma-ray data converted to per cent eU3O8, geological logs and drill hole survey data. Monaro reported a JORC 2004-compliant inferred resource of 6.0 million tonnes at an average grade of 0.09 per cent eU3O8 using a cut-off grade of 0.03 per cent eU3O8 for 11.4 million pounds of contained U3O8. JORC is the Australian Joint Ore Reserves Committee, a professional code of practice that sets minimum standards for public reporting of mineral resources.

In 2011, Australian-American Mining Corp. Ltd. commissioned a technical report on Rio Puerco. This most recent report validated and confirmed the historical resource.

The historical resource outlined in this news release has not been verified and should not be relied upon. It is a historical estimate and not current and does not comply with Canadian National Instrument 43-101 guidelines for the reporting of mineral resources. A qualified person has not verified the historical resource estimate on behalf of the company and North Shore has completed no work programs at Rio Puerco. Though not current, the company views the historical resource estimates as reliable and sufficient to justify the initiation of work programs aimed at validating and potentially expanding upon the estimates. There is no guarantee that the work programs envisioned by North Shore will ultimately result in the definition of NI 43-101 compliant resources.

The 27 new BLM claims are subject to the Rio Puerco option agreement, under which North Shore has the right to acquire up to an 87.5-per-cent interest in Rio Puerco from Resurrection Mining LLC. Further information on Rio Puerco can be found in the company's news releases dated June 24, 2025, and Aug. 28, 2025.

The key assumptions, parameters and methods used to prepare the historical resource estimate are described in the referenced technical reports.

Equity compensation

On Sept. 10, 2025, the board of directors of the company approved a grant of a total of 1,625,000 restricted share units (RSUs) to directors, officers and consultants of the company under the company's shareholder approved equity incentive plan. The RSUs will vest on the first anniversary of the grant date and will be settled in accordance with the equity incentive plan.

In addition, a total of 2,075,000 stock options were granted pursuant to the company's shareholder-approved stock option plan to directors, officers and consultants of the company and grant the holder the right to purchase one common share at a purchase price of 17.5 cents per common share for a period of five years from the date of grant. The stock options will vest immediately upon grant.

The securities issued pursuant to the equity grants described herein are subject to a statutory hold period of four months and one day from the date of issuance in accordance with applicable Canadian securities laws and the policies of the TSX Venture Exchange. The equity grants described herein remain subject to the approval of the TSX-V.

About North Shore Uranium Ltd.

The nuclear power industry is in growth mode as more nuclear power will be required to meet the world's ambitious carbon-dioxide-emission-reduction goals and the needs of new power-intensive technologies such as AI (artificial intelligence). In this environment, new discoveries of economic uranium deposits will be very valuable, especially in established uranium-producing jurisdictions such as Saskatchewan and New Mexico. North Shore is well positioned to become a major force in exploration for economic uranium deposits. The company is working to achieve this goal by exploring Rio Puerco in the Grants uranium district of New Mexico and its Falcon and West Bear properties at the eastern margin of the Athabasca basin in Saskatchewan. In addition, the company continues to evaluate quality opportunities in the United States and Canada to complement its portfolio of uranium properties.

Qualified person

Brooke Clements, MSc, PGeol, a qualified person as defined by NI 43-101, Standards of Disclosure for Mineral Projects, and the president and chief executive officer of North Shore, has reviewed and approved the scientific and technical disclosure in this press release.

We seek Safe Harbor.