Osisko Intersects 592 Metres Averaging 0.33% Cu at Gaspé

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* See explanatory notes below on copper equivalent values and Quality Assurance/Quality Controls.
** “Both” indicates drill holes that have
contiguous shallower infill as well as deeper expansion intercepts.

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Discussion

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Drill hole 30-1107, located on top of Copper Mountain near the center of the 2024 MRE model, cut three mineralized intervals including 592.0 metres averaging 0.33 % Cu, 1.68 g/t Ag and 0.032% Mo (which includes 336.6 metres of depth expansion), extending mineralization in this area to a vertical depth of 1003 metres.

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Drill hole 30-1112, located on the western flank of Copper Mountain, cut two mineralized intervals including 868.5 metres averaging 0.23 % Cu, 1.45 g/t Ag and 0.019% Mo (which includes 417.0 metres of depth expansion), extending mineralization in this area to a vertical depth of 1119 metres.

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Drill hole 30-1113, located on the western margin of the 2024 MRE model, cut multiple intersections of mineralization, 26 to 42 metres thick and distributed in “layer cake” fashion from surface to a vertical depth of 769 metres, confirming the current limit of the 2024 MRE model at this location.

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Drill hole 30-1114, located near the eastern margin of the 2024 MRE model, cut multiple intersections of mineralization distributed in “layer cake” fashion from surface to a vertical depth of 950 metres, including 142.1 metres averaging 0.39 % Cu, 1.50 g/t Ag and 0.019% Mo (expansion).

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Drill hole 30-1116, located on top of Copper Mountain near the center of the 2024 MRE model, cut six mineralized intervals including 565.5 metres averaging 0.22 % Cu, 1.86 g/t Ag and 0.017% Mo (which includes 96.3 metres of depth expansion), extending mineralization in this area to a vertical depth of 1110 metres.

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Drill holes 30-1119 and 30-1124, both located immediately south of the southern margin of the 2024 MRE model, cut multiple intersections of mineralization, including 46.4 metres averaging 1.10 % Cu, 5.08 g/t Ag and 0.032% Mo near and including the E Zone skarn horizon (30-1119) and 203.2 metres averaging 0.37% Cu and 2.81 g/t Ag (30-1124). These intersections extend mineralization to a vertical depth of 619 metres within the southern expansion of the deposit, which remains open towards Needle Mountain East.

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Drill hole 30-1121, located 50 metres east of the 2024 MRE model, did not intersect significant mineralization as expected, once again confirming the current eastern limit of the resource model.

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Drill hole 30-1122, located on the western flank of Copper Mountain, intersected three mineralized intervals, including 760.5 metres averaging 0.24% Cu, 1.71 g/t Ag and 0.015% Mo (which includes 456.1 metres of depth expansion), extending mineralization in this area to a vertical depth of 1137 metres.

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Mineralization at Gaspé Copper is of porphyry copper/skarn type and occurs as disseminations and stockworks of chalcopyrite with pyrite or pyrrhotite and minor bornite and molybdenite. One prograde and at least five retrograde vein/stockwork mineralizing events have been recognized at Copper Mountain, which overprint earlier, bedding replacement skarn and porcellanite-hosted mineralization throughout the Gaspé Copper system. Porcellanite is a historical mining term used to describe bleached, pale green to white potassic-altered hornfels. Subvertical stockwork mineralization dominates at Copper Mountain whereas prograde bedding-parallel mineralization, that is mostly stratigraphically controlled, dominates in the area of lower Copper Mountain, Needle Mountain, Needle East, and Copper Brook. High molybdenum grades (up to 0.5% Mo) were locally obtained in both the C Zone and E Zone skarns away from Copper Mountain.