Mr. Brooke Clements reports

NORTH SHORE ENGAGES DRILL CONTRACTOR AND CONTINUES TO ADVANCE RIO PUERCO PROJECT

North Shore Uranium Ltd. has provided an update on its preparations for a drill program at the Rio Puerco uranium project in the Grants uranium district of northwestern New Mexico. The company has engaged Harris Exploration Drilling and Associates of Fallon, Nev., a subsidiary of Earth Drilling Co. Ltd. to carry out its drill program at Rio Puerco. North Shore continues preparing for an initial program of up to 27 drill holes, currently scheduled to commence in May, subject to the receipt of all required permits and approvals.

As announced on Feb. 23, 2026, North Shore filed a minimal impact exploration operation permit application for Rio Puerco with the state of New Mexico's mining and minerals division. In addition, a notice of intent for a mineral exploration program has been filed with the Bureau of Land Management (the BLM). On March 24, 2026, North Shore's president and chief executive officer, Brooke Clements, led nine state and federal officials on a tour of the Rio Puerco site that was focused on the proposed drilling locations. The site visit gave North Shore the opportunity to provide on the ground insight to the regulators to aid them in assessing the company's submissions.

Experienced uranium drill contractor engaged

Harris Exploration provides mineral exploration, geotechnical and environmental drilling services across the United States and Canada. They operate a fleet of 41 drilling rigs including reverse circulation, diamond core, sonic, mud/air rotary, dual rotary and auger drills. Harris Exploration's uranium experience includes completion of drilling campaigns for NexGen Energy Ltd. in the Athabasca basin of Saskatchewan, Myriad Uranium Corp. in Wyoming and Homeland Uranium Corp. in Colorado. They are proud of having a strong commitment to safety, a major priority for North Shore.

Rio Puerco exploration plans

A historical resource estimate of 6.0 million tonnes at an average grade of 0.09 per cent eU3O8 (triuranium octoxide equivalent) for 11.4 million pounds of U3O8 was reported for Rio Puerco in 2009 (the historical resource). The historical resource was based on drill data gathered by Kerr McGee Corp. in the 1960s and 1970s.

Brooke Clements, president and chief executive officer of North Shore, stated: "We look forward to working with Harris Exploration at Rio Puerco and to getting the drills turning. Their uranium experience and commitment to safety are valued by us. The logistical and technical components of the program are now being finalized and we look forward to receiving our permits and to verifying Kerr-McGee's historical work at Rio Puerco. "

North Shore currently controls 83 BLM claims at Rio Puerco covering portions of seven sections of land. The goal of the company's planned 2026 drill program is to validate the Kerr-McGee drill data used to estimate the historical resource and begin the process of confirming exploration potential by assessing sites where uranium mineralization was reported outside of the historical resource. The historical resource was defined with data from approximately 800 drill holes in Section 18. A 1975 consultant's report illustrates Rio Puerco exploration potential. It describes the drilling of over 200 holes in Section 24 by Kerr-McGee that outlined 201,684 tons (short tons) of uranium mineralization at an average grade of 0.20 per cent U3O8. Using a cut-off grade of 0.05 per cent U3O8 that represented 821,962 pounds of U3O8.

The company has selected 27 sites for rotary drilling at Rio Puerco. The vast majority of the historical drill holes utilized the mud rotary technique. Each of the drill holes will twin the 1970s-era rotary holes drilled by Kerr-McGee. The 25 Section 18 drill hole locations were selected to be representative of the data set used to estimate the historical resource. The two Section 24 drill holes have been selected to work toward expanding the uranium mineralization footprint at the project. The results from the 2026 drill holes will be compared with the historical results in an effort to validate the historic work and upgrade the historical resource to a current and National Instrument 43-101-compliant resource. Many of the proposed drill sites were assessed in the field in late March by state and federal regulators and Harris Exploration.

Rio Puerco background information and historical resource estimates

Rio Puerco is located at the eastern end of the Grants uranium district which is the largest historic producer of uranium in the United States. Mines that operated between about 1950 and 2002 produced over 340 million pounds of U3O8. The district is currently seeing renewed exploration and development activity.

Uranium was first discovered at Rio Puerco in 1968. The claims covering the discovery were ultimately optioned to Kerr-McGee who drilled over 1,100 holes in the immediate area. Based on the results of that work, they began the development of the Rio Puerco mine in the 1970s. The mine was intended to be a room and pillar underground mine but was never put into production. Activity ceased in the early 1980s after a short trial mining phase due to low uranium prices at the time. The underground mine infrastructure included a 260 m 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 equivalent U3O8 (eU3O8), geological logs and drill hole survey data. Monaro reported a JORC (Joint Ore Reserves Committee)-code-(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 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 NI 43-101 guidelines for the reporting of mineral resources. The JORC code (2004) is broadly consistent with the CIM (Canadian Institute of Mining) definition standards adopted under NI 43-101, though differences may exist in the categorization of inferred 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 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 key assumptions, parameters and methods used to prepare the historical resource estimate are described in the two technical reports referenced in this news release.

The 83 BLM claims in the project area 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.

Qualified person

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

Data verification

Mr. Clements has reviewed and verified all of the data supporting the technical information disclosed in this news release. The data includes the 2009 and 2011 technical reports and supporting data, the 1975 consultant's report by McDougald, a 3-D model prepared by North Shore showing interpreted uranium mineralization, analysis of drill data used to select sites for drilling, original hard copy and scanned drill hole location maps, and drill logs prepared by Kerr-McGee and plan maps from the Kerr-McGee underground mine development. In addition, Mr. Clements assessed all of the sites currently selected for drilling in the field in February, 2026. As stated above, the historical resource outlined in this news release has not been verified, is not current and does not comply with Canadian NI 43-101 guidelines for the reporting of mineral resources.

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 CO2 (carbon dioxide) emission-reduction goals and the needs of new power-intensive technologies like AI (artificial intelligence). In this environment, new discoveries of economic uranium deposits will be very valuable, especially in established uranium-producing jurisdictions like 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.

We seek Safe Harbor.