Osisko Intersects 138 Metres Averaging 1.45% Cu in South Extension at Gaspe

The most recent news release, dated November 20, 2025, announces new drill results from the Gaspé Copper Project in Québec. The highlight is hole 30-1136, which intersected a significant high-grade expansion zone of 138.0 metres averaging 1.45% Copper (Cu). CEO Robert Wares noted this includes a higher-grade sub-interval of 64.5 metres averaging 2.70% Cu. The release also includes results from seven other holes, which continue to show long intervals of copper mineralization, both as infill within the current resource model and as expansion outside of it. The company remains on track for an updated Mineral Resource Estimate (MRE) in early 2026.

This news is materially positive. While Osisko has consistently released drill results showing very long intercepts of copper mineralization throughout 2025, those results have typically been of lower grade (0.20% - 0.40% Cu). The highlight intercept of 138.0 metres at 1.45% Cu in an expansion hole is a significant development. It demonstrates the potential for a high-grade core within the broader large-tonnage, lower-grade system. High-grade zones are critical for improving project economics, as they can be prioritized in a mine plan to enhance early cash flows and overall profitability.

Looking at the historical context: - December 2024: The company executed a transformative $107.4 million financing and brought in a new management team, setting the stage for an aggressive 110,000-metre drill program at Gaspé. - February-October 2025: A steady flow of drill results consistently confirmed and expanded the known mineralization with very long intercepts (e.g., 1117.5m @ 0.25% Cu, 731m @ 0.29% Cu, 592m @ 0.33% Cu). This successfully demonstrated the project's massive scale. - November 12, 2025: Just prior to the current release, the company reported 330.6 metres averaging 0.46% Cu, already indicating improving grades.

The November 20th results significantly build on this momentum by delivering the best grade-over-width intercept to date. This result validates the exploration strategy, de-risks the geological model, and provides a crucial data point for the upcoming MRE in early 2026. For a market that has already accepted the project's size, demonstrating high-grade potential is a key catalyst for a re-rating. This result exceeds the expectations set by previous drilling and confirms the southern extension of the deposit is a key area for resource growth and grade enhancement.

Osisko Metals Incorporated is a Canadian mineral exploration and development company focused on critical metals. Its flagship asset is the Gaspé Copper Project, located in Québec. This is a past-producing mine complex that Osisko acquired 100% of from Glencore in 2023. The company is currently executing a major drill program to confirm and expand the historical resource, which is already considered the largest undeveloped copper resource in Eastern North America. The company also holds a joint venture interest in the Pine Point Project, a past-producing zinc-lead district in the Northwest Territories, with Appian Capital Advisory LLP.