North Shore Begins Drilling at Rio Puerco

Executive Summary

• North Shore Uranium Ltd. has commenced its first drill program at the Rio Puerco uranium project in the Grants Uranium District of New Mexico.
• The company has completed 3 rotary drill holes totaling 625 meters, with a planned program of up to 26 holes for approximately 5,975 meters.
• The program aims to validate historical exploration data from Kerr-McGee (1960s/1970s), with each new site serving as a "twin" to a historical hole, following the receipt of state and federal exploration permits in May 2026.

Key Details

• Project Location: Rio Puerco uranium project, Grants Uranium District, northwestern New Mexico
• Current Progress: 3 rotary drill holes completed by Harris Exploration Drilling and Associates, totaling 625 m (2,050 ft.)
• Planned Scope: Up to 26 holes totaling approximately 5,975 m (19,600 ft.)
• Program Objective: Validate and further evaluate historical exploration data generated by Kerr-McGee Mining Corporation in the 1960s and 1970s
• Drilling Methodology: Each selected site is a "twin" to a rotary hole originally drilled by Kerr-McGee in the 1970s
• Regulatory Approvals: Received Minimal Impact Exploration Operation Permit from the State of New Mexico and Notice of Intent to conduct mineral exploration activities from the Bureau of Land Management in May 2026
• Historical Context: Details of the 2026 drill program, uranium mineralization, and work history were previously summarized on April 9, 2026
• Industry Context: CEO references Urenco's major expansion announcement on June 2, 2026, highlighting New Mexico's potential as a future leader in U.S. uranium production
• Qualified Person: Mr. Brooke Clements, MSc, P.Geol., President and CEO, has reviewed and approved the scientific and technical disclosure

Notable Quotes

• "We are excited to see the drill turning at Rio Puerco and the program running smoothly. The data we acquire from this program will help us do a detailed assessment of the uranium mineralization at the Project. With its rich uranium mining history and an abundance of uranium resources, we think that New Mexico has the potential to become a leader in the USA's push to produce more uranium in the future. On June 2, Urenco, one of two uranium enrichment facilities in the USA and the largest, located in New Mexico, announced a major expansion." — Brooke Clements, President and CEO