Osisko Intersects 1117.5 Metres Averaging 0.25% Cu at Gaspe

Executive Summary

• Osisko Metals announced significant new drill intercepts from the Gaspé Copper Project, including a record 1117.5 m continuous mineralization interval (0.25% Cu) in hole 30‑1097.
• The results add both infill and expansion material, extending known mineralization to depths of >1,200 m and supporting the company’s plan to upgrade the November 2024 MRE to Measured/Indicated categories and to expand resources further in Q1 2026.
• Overall drilling to date totals >65,000 m across 10 rigs, with multiple long‑interval intercepts averaging 0.20–0.32% Cu and containing notable Ag and Mo credits.

Key Details

• Hole 30‑1097: 1117.5 m @ 0.25% Cu (incl. 691.5 m infill @ 0.24% Cu, 426.0 m expansion @ 0.27% Cu); also 1.81 g/t Ag, 0.022% Mo; depth to 1,204 m.
• Hole 30‑1100: Five intervals totalling 228.5 m @ 0.25% Cu (expansion) plus additional expansion zones of 127.2 m @ 0.15% Cu and 111.7 m @ 0.17% Cu; depth to 975 m.
• Hole 30‑1101: 148.5 m @ 0.32% Cu, 2.52 g/t Ag (infill); plus shorter infill/expansion intervals down to 27.7 m.
• Hole 30‑1104: 792.0 m @ 0.20% Cu, 1.33 g/t Ag (both infill & expansion) extending to 969 m; includes 390.5 m infill @ 0.18% Cu and 401.5 m expansion @ 0.22% Cu.
• Hole 30‑1105: 110.5 m @ 0.20% Cu (infill) + 93.7 m @ 0.25% Cu (both) + 288.0 m @ 0.19% Cu (expansion); depth to 666 m.
• Additional holes (30‑1102, etc.) report shorter high‑grade intervals (e.g., 51 m @ 0.36% Cu, 3.62 g/t Ag).

All intercepts calculated using a 0.12% CuEq cut‑off over ≥20 m; true widths estimated at 90–92% of core length.

• Program status: >65,000 m drilled to date; 10 rigs operating; program continues through Dec 2025 with goal of converting the November 2024 MRE (824 Mt @ 0.34% CuEq Indicated; 670 Mt @ 0.38% CuEq Inferred) to higher confidence categories and adding depth extensions for a Q1 2026 update.

• Qualified Person: Bernard‑Olivier Martel, P.Geo., OGQ 492 (NI 43‑101).

Notable Quotes

“Drill hole 30‑1097 produced our longest intersection so far… The updated MRE is well on track to be released in Q1 2026.” – Robert Wares, CEO

All forward‑looking statements are subject to risks and uncertainties; see company disclaimer.