Selkirk Copper intercepts high-grade mineralization at Minto North and Area 118

Highlights

Infill drilling at Minto North intersected high-grade mineralization within the centre of this priority resource area:

6.01% Cu, 8.77g/t Au, and 36.6 g/t Ag (13.12% CuEq) over 1.93 m , within a broader interval of 1.49% CuEq over 33 metres in drill hole 26SCM190

Step-out drilling at Minto North intersected new mineralization beyond a previously interpreted fault, which is reinterpreted indicating potential for further expansion of mineralization southwards into an untested area:

3.43% Cu, 0.36 Au, and 47 g/t Ag (3.87% CuEq) over 3.7 m, within a broader interval of 2.25% CuEq over 13.3 metres in drill hole 26SCM205

Exploration drilling at Area 118 intersected high-grade mineralization located 125 metres from historical underground development:

A 50-metre step-out intersected 3.39% Cu, 0.61 g/t Au, and 16.5 g/t Ag (3.73% CuEq) over 6.0 m, within a broader interval 1.66% CuEq over 23.0m in drill hole 26SCM188

The planned 50,000 metre Phase 2 drill program is advancing rapidly and ahead of schedule, with >45,000 metres completed to date

Preliminary Economic Assessment Update

Selkirk Copper's team continues to advance underground and surface mine development plans, integrated mine and mineral processing plans, waste storage facility designs, and facilities work, including capital cost, sustaining cost, and operating cost estimates to inform a Preliminary Economic Assessment ("PEA"). A key focus of this work is to fully consider the significant increase in the Mineral Resource Estimate (see July 30, 2026 News Release) into the overall plans which has led to additional planning and development work. The Company is committed to completing the PEA in Q3 2026 which will reflect the potential of a planned restart of the former Minto copper-gold-silver mine.

Vancouver, British Columbia and Pelly Crossing, Yu