Osisko Intersects 320 Metres Averaging 0.38% Cu at Gaspé

MONTREAL, July 23, 2026 (GLOBE NEWSWIRE) -- Osisko Metals Incorporated (the “ Company ” or “ Osisko Metals ”)  ( TSX: OM ; OTCQX: OMZNF ; FRANKFURT: 0B51 ) is pleased to announce new results from the 2026 drill program at the Gaspé Copper Project, located in the Gaspé Peninsula of Eastern Québec. New analytical results from the 2026 drill program are presented below (see Table 1), including 25 mineralized intercepts from 12 new drill holes. Reported “infill” intercepts are 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 are located outside the 2026 MRE model and 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) out-of-pit 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: “Drilling at the Gasp é Copper Project continues to advance with seven drills currently active at site, and our work continues to expand the known deposit to the south and southwest, both within and beyond the 2026 MRE Whittle pit volume.

The new drilling is showing excellent potential for conversion of currently categorized in-pit waste rock to new mineralized zones in the direction of Needle East and Needle Mountain.  We are also seeing good intercepts of mineralization outside the 2026 MRE resource model with copper grades exceeding the current