Osisko Metals Intersects 80 Metres Averaging 1.93% Cu at Gaspé

About this update from Osisko Metals Incorporated

New intercepts located in Southern Expansion Area MONTREAL, June 09, 2026 (GLOBE NEWSWIRE) -- Osisko Metals Incorporated (the "Company" or "Osisko Metals") (TSX: OM; OTCQX: OMZNF; FRANKFURT: 0B51) is pleased to announce initial results from the 2026 drill program at the Gaspé Copper Project, located in the Gaspé Peninsula of Eastern Québec. Five drills are currently active on the property, with two additional drills commencing work this month. New analytical results from the 2026 drill program are presented below (see Table 1), including four mineralized intercepts from two new drill holes. For the 2026 program, reported “infill” intercepts will be located within the 2026 MRE model (see April 14, 2026 news release), and will be focused on upgrading inferred mineral resources to measured or indicated categories, as applicable. “Expansion” intercepts will be located outside the 2026 MRE model and will comprise either A) in-pit expansion, which offers potential to convert in-pit waste into additional resources within the 2026 MRE Whittle pit, or B) outside expansion, consisting of mineralization located out of the 2026 MRE Whittle pit, which may potentially lead to the definition of new resources. Some of the reported intercepts may have contiguous shallower infill as well as deeper expansion (noted as “Both”). Maps showing hole locations are available at www.osiskometals.com. Osisko Metals Chief Executive Officer Robert Wares commented: “The 2026 drill program is off to an excellent start with three new significant intersections reported from the Needle Mountain expansion area, all within modelled waste rock of the 2026 MRE Whittle pit volume. With the launch of the 2026 drill program, we believe that there is excellent potential for conversion of currently categorized in-pit waste rock to new mineralized zones in the direction of Needle Mountain.” Highlights: Drill hole 30-1196 80.0 metres averaging 1.93% Cu (1.97% CuEq – in-pit expansion) Drill hole 30-1195 76.5 metres averaging 0.35% Cu (0.42% CuEq – in-pit expansion) Table 1: Infill and Expansion Drilling Results DDH No. From (m) To (m) Length (m) Cu % Ag g/t Mo % CuEq* % Type** 30-1195 280.5 357.0 76.5 0.35 2.54 0.020 0.42 Expansion 1 And 568.5 630.0 61.5 0.27 1.74 0.008 0.30 Expansion 2 30-1196 97.5 162.0 64.5 0.57 3.13 <0.005 0.58 Expansion 1 And 196.0 276.0 80.0 1.93 9.64 0.013 1.97 Expansion 1 (...

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