Osisko Intersects 211 Metres Averaging 0.59% Cu at Gaspé

Osisko Intersects 211 Metres Averaging 0.59% Cu at Gaspé

Includes 28.5 Metres Averaging 2.31% Cu and 11.8 g/t Ag

South-Western Extension provides additional high-grade intercept of 86 metres averaging 1.36% Cu

MONTREAL, Sept. 28, 2026 (GLOBE NEWSWIRE) -- Osisko Metals Incorporated (the “ Company ” or “ Osisko Metals ”) ( TSX: OM ; OTCQX: OMZNF ; FRANKFURT: 0B51 ) is pleased to announce additional new analytical results from the 2026 drill program at the Gaspé Copper Project, located in the Gaspé Peninsula of Eastern Québec.

New results are presented below ( see Table 1 ), including 28 mineralized intercepts from 12 drill holes. Reported “infill” intercepts are located within the 2026 MRE model ( see April 14, 2026 news release ), 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 i) in-pit expansion, which offers potential to convert in-pit waste into additional resources within the 2026 MRE Whittle pit; or ii) out-of-pit expansion, consisting of mineralization located outside 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 in-pit expansion (noted as “Both”). Maps showing hole locations are available at www.osiskometals.com .

Osisko Metals Chief Executive Officer Robert Wares commented: “Another series of excellent results from the north slope of Needle Mountain, including particularly two high-grade intercepts in holes 30-1236 and 30-1243, both located 500 to 600 metres west of the 2026 MRE model. The mineralized system continues to show grade improvement in the area around Needle Mountain and we are confident that these mineralized zones will be included in a westerly pit expansion in the next resource update.”

Highlights

211.5 metres averaging 0.59% Cu (out-of-pit expansion) in DDH 30-1243, i