Sirios Resources: Advancing a Multi-million-ounce Gold Project in Québec’s James Bay Region

Sirios Resources (TSXV:SOI,OTCQB:SIREF) is a Québec-based gold exploration and development company focused on high-potential projects in the Eeyou Istchee James Bay region. Its flagship Cheechoo gold project ranks among the largest in the province by resource size and benefits from favourable geology, near-surface mineralization, and existing infrastructure, including road access, power lines, and proximity to the Éléonore mine. Sirios is advancing Cheechoo through systematic drilling, resource expansion, and technical studies, aiming to progress the project toward a Preliminary Economic Assessment (PEA).

In December 2025, Sirios completed a transformational combination with OVI Mining, creating a district-scale gold platform anchored by Cheechoo and complemented by the Corvet Est and PLEX projects. The transaction integrates Sirios into the Osisko development ecosystem, strengthening the leadership team with proven mine-building and capital markets expertise while maintaining the company’s deep geological knowledge of the James Bay region.

With over 30 years of continuous exploration in James Bay and strong partnerships with local and Indigenous communities, Sirios is well-positioned to create value through disciplined project advancement and exploration-driven growth. The company’s combination of experience, strategic assets, and community engagement underpins its long-term growth strategy.

Company Highlights

• Flagship Cheechoo gold project hosts approximately 3 million ounces of gold, including 1.3 million ounces indicated and 1.7 million ounces inferred, including additional underground resources
• Located in Eeyou Istchee James Bay, Québec, a Tier-1 mining jurisdiction with strong government and community support
• Low strip ratio (2.9:1) and high gold recoveries (92 percent) support attractive open-pit development potential at Cheechoo
• Strategic combination with OVI Mining brings Osisko-backed leadership, capital markets strength and additional district-scale exploration assets
• Well-funded with recent treasury additions, supporting advancement of Cheechoo toward a preliminary economic assessment (PEA) and ongoing exploration across the portfolio

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