Osisko Intersects 738 Metres Averaging 0.31% Cu at Gaspe

Executive Summary

• Osisko Metals Incorporated announced new drill results from the Gaspé Copper Project in Eastern Québec, presenting 29 mineralized intercepts from ten new drill holes (30-1147 to 30-1156).
• The drilling program focused on upgrading inferred mineral resources to measured or indicated categories (infill) and testing for potential resource expansion outside the 2024 Model Resource Estimate (MRE) model.
• Significant long-intercept results were reported, including 760.5m at 0.26% Cu (0.35% CuEq) in hole 30-1156 and 738.0m at 0.31% Cu (0.41% CuEq) in hole 30-1155, demonstrating extensive mineralization extending to significant vertical depths.

Key Details

• Drill Hole 30-1155: Intercepted 738.0 metres averaging 0.31% Cu (0.41% CuEq), comprising 610.0m of infill (0.33% Cu, 0.43% CuEq) and 128.0m of expansion (0.20% Cu, 0.30% CuEq). Extended mineralization to a vertical depth of 719 metres.
• Drill Hole 30-1156: Intercepted 760.5 metres averaging 0.26% Cu (0.35% CuEq), comprising 618.2m of infill (0.26% Cu, 0.34% CuEq) and 142.3m of expansion (0.26% Cu, 0.40% CuEq). Extended mineralization to a vertical depth of 886 metres.
• Drill Hole 30-1154: Intercepted 726.0 metres averaging 0.21% Cu (0.31% CuEq), comprising 446.9m of infill (0.23% Cu, 0.33% CuEq) and 279.1m of expansion (0.19% Cu, 0.28% CuEq). Extended mineralization to a vertical depth of 973 metres.
• Drill Hole 30-1148: Intercepted 613.5 metres averaging 0.22% Cu (0.32% CuEq), comprising 246.8m of infill (0.27% Cu, 0.37% CuEq) and 366.7m of expansion (0.18% Cu, 0.30% CuEq). Extended mineralization to a vertical depth of 958 metres.
• Drill Hole 30-1151: Intercepted 484.5 metres averaging 0.27% Cu (0.41% CuEq), comprising 352.8m of infill (0.27% Cu, 0.41% CuEq) and 131.7m of expansion (0.25% Cu, 0.39% CuEq). Extended mineralization to a vertical depth of 940 metres.
• Drill Hole 30-1149: Intercepted 395.0 metres averaging 0.26% Cu (0.30% CuEq) as infill, plus additional infill intervals of 49.5m and 114.4m. Confirmed mineralization to a vertical depth of 816 metres.
• Drill Hole 30-1150: Intercepted 340.5 metres averaging 0.21% Cu (0.30% CuEq) as both infill and expansion. Included high-grade molybdenum zones in expansion intervals, specifically 76.0m averaging 0.20% Cu, 1.29 g/t Ag, and 0.095% Mo (including a 7.4m interval averaging 0.55% Mo in the E Zone skarn). Extended mineralization to a vertical depth of 916 metres.
• Drill Hole 30-1153: Intercepted 310.0 metres averaging 0.26% Cu (0.31% CuEq) as infill, followed by 154.5m of infill. Confirmed mineralization to a vertical depth of 655 metres within the porphyry core.
• Drill Hole 30-1147: Intercepted multiple intervals totaling 978m drilled, including 162.7m (0.17% Cu), 54.0m (0.13% Cu), 246.0m (0.18% Cu, 0.013% Mo), 60.0m (0.13% Cu, 0.027% Mo), and 228.0m (0.26% Cu, 0.012% Mo). Extended mineralization to a vertical depth of 946 metres.
• Drill Hole 30-1152: Located in the Southern Extension Zone, cut three expansion intervals: 12.0m (0.16% Cu), 76.0m (0.14% Cu), and 27.5m (0.22% Cu), establishing the near-eastern limit of the zone.
• Technical Parameters:
  • Cut-off: 0.12% CuEq lower cut-off over contiguous 20-metre intersections.
  • Copper Equivalent Calculation: Based on US$4.25/lb Cu, $20.00/lb Mo, US$24/oz Ag; recoveries of 92% (Cu), 70% (Mo), 70% (Ag); and net smelter returns of 86.5% (Cu), 90.7% (Mo), 75.0% (Ag).
  • True Width: Estimated at 90–92% of reported core length.
• Context: The 2024 MRE consisted of 824 Mt Indicated at 0.34% CuEq and 670 Mt Inferred at 0.38% CuEq. The current drilling aims to convert Inferred to Measured/Indicated and expand the resource model, with an updated MRE scheduled for Q1 2026.

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