Osisko Metals raises mineral resources at Gaspé Copper

Base Case Outlines M&I Resources of 1.83 Billion tonnes at 0.27% Cu and Inferred Resources of 0.24 Billion tonnes at 0.41% Cu 2026 Drill Program to Commence at Month End to Further Infill and Expand Resource DPEX Drill Program to Commence in May MONTREAL, April 14, 2026 (GLOBE NEWSWIRE) -- Osisko Metals Incorporated (the “ Company ” or “ Osisko Metals ”) ( TSX: OM ; OTCQX: OMZNF ) is pleased to announce an updated Mineral Resource Estimate (“ MRE ”) for the Gaspé Copper Project, located in Eastern Quebec, following 118,000 metres of drilling completed in 2025. The updated MRE (Table 1) includes base case, pit-constrained resources comprising 1,834 million tonnes averaging 0.27% Cu (0.32% CuEq ) of Measured and Indicated categories (M&I), and 239 million tonnes averaging 0.41% Cu (0.46% CuEq) of Inferred category. The updated M&I Resource represents a 119% increase in copper metal content over the previously reported Indicated Resource ( see November 14, 2024 news release ).

This pit-constrained M&I Resource outlines one of the largest undeveloped copper-molybdenum deposits in North America :10.8 billion pounds (4.88 million tonnes) of contained copper , as well as significant molybdenum (673 million pounds), and silver (93 million ounces). Inferred resources outline the potential for an additional 2.2 billion pounds (0.98 million tonnes) of contained copper, 83 million pounds of molybdenum, and 14 million ounces of silver. Osisko Metals Chief Executive Officer Robert Wares commented: “We are very proud to announce this updated mineral resource estimate for Gaspé Copper.

The 2025 drill program successfully converted and expanded the 2024 MRE to the Measured and Indicated resource categories and has added new significant higher-grade Inferred resources to the south. An additional 50,000 metre drill program will commence at the end of this month, with the objective of upgrading the remaining Inferred Resource to the Indicated category and expanding the boundaries of th