Osisko Metals (OM) investor relations material

Strategic positioning and leadership

• Recognized as a leading copper development company in Canada, with a strong focus on Quebec-based assets.

• Senior management team has a proven track record in discovery, development, and delivering high shareholder returns, including major gold and copper projects.

• Approximately 80% of shares are institutionally or strategically held, with major investors including Agnico Eagle, Hudbay, Franco-Nevada, CDPQ, Glencore, and Gold Fields.

Gaspé Copper project overview

• Gaspé Copper is one of North America's largest undeveloped copper projects, with significant infrastructure already in place.

• Current in-pit measured and indicated resources total 1.83 billion tonnes at 0.27% Cu, with 0.24 billion tonnes inferred at 0.41% Cu.

• Project is located near a deep-sea port, power substation, and paved highway, facilitating logistics and export.

• Strategic offtake agreement in place with Glencore for copper concentrates.

Resource and exploration highlights

• 2026 mineral resource estimate (MRE) outlines 1.83 Bt measured & indicated at 0.32% CuEq and 0.24 Bt inferred at 0.46% CuEq.

• Fully funded 50,000-metre drill program underway in 2026, targeting resource conversion, expansion, and higher-grade skarn zones.

• Historical and recent drilling at Porphyry Mountain demonstrates large-scale, high-grade mineralization open at depth.

• Metallurgical tests indicate high recoveries and clean concentrates: 89–91% copper recovery at 25% concentrate grade.