Selkirk Copper drills 9.3% Cu, 7.4 g/t Au, 54.9 g/t Ag over 5.4 m at Minto North

Highlights

Step-out drilling at Minto North intersected high-grade mineralization at the southern margin of this priority resource area:

9.27% Cu, 7.43 g/t Au, and 54.9 g/t Ag (15.11% CuEq) over 5.4 m , as well as an additional interval of 0.97% Cu, 2.58 g/t Au, and 8.4 g/t Ag (3.11% CuEq) over 9.0 m, in drill hole 26SCM209

This hole ranks amongst the highest-grade intersections that has ever been drilled at Minto Property

Infill drilling at Area 118 continues to delineate high-grade mineralization within 100 m of historical underground workings:

2.54% Cu, 1.25 g/t Au, and 10.7 g/t Ag (3.45% CuEq) over 3 m , within a broader interval of 1.43% CuEq over 14.8 m, in drill hole 26SCM216

1.61% Cu, 0.59 g/t Au, and 8.3 g/t Ag (2.03% CuEq) over 6.9 m , within a broader interval of 1.02% CuEq over 33.3 m, in drill hole 26SCM207

Infill drilling at Minto Main intersected additional mineralization within the 114 and 117 Lenses:

1.15% Cu, 0.43 g/t Au, 2.7 g/t Ag (1.42% CuEq) over 9.7 m , as well as a second interval of 0.83% Cu, 0.19 g/t Au, and 2.7 g/t Ag (0.94% CuEq) over 32.1 m, in drill hole 26SCM235

Infill drilling at Copper Keel continues to delineate additional mineralization within the 101 Lens:

1.30% Cu, 0.34 g/t Au, 3.4 g/t Ag (1.49% CuEq) over 7.0 m , within a broader interval of 0.94% CuEq over 18.0 m, in drill hole 26SCM238

Drilling Milestone Update

In late August, Selkirk Copper marked a major milestone in drilling activities, recognizing one year of drilling completed since August 23, 2025. As of that date, the team has completed 365 diamond drill holes in 365 days, for a total of 98,467 metres in one year . This represents one of the largest single-year drill programs ever completed in Yukon history and represents approximately 200,000 person-hours and a ~C$45M investment in mineral res