Investor Insight
Sirios Resources is advancing one of Québec’s largest undeveloped gold deposits, combining a multi-million-ounce resource base, strong infrastructure access and deep regional expertise backed by the Osisko development ecosystem, creating a clear pathway toward re-rating and growth.
Overview
Sirios Resources (TSXV:SOI,OTCQB:SIREF) is the leading gold explorer and developer in the Eeyou Istchee James Bay region of Canada. Based in Québec, Sirios’ main focus is on developing the flagship Cheechoo Project, which hosts a multi-million ounce gold system strategically located adjacent to Newmont’s Éléonore mine. The strategy for Cheechoo is three-fold: resource growth through exploration, advancing a large-scale open-pit development opportunity, and creating a platform for exploring their extensive portfolio of highly prospective gold assets in the region.
Sirios’ mission is to lead gold exploration and development in Eeyou Istchee to create long-term value of shareholders by responsibly developing high-quality gold assets and fostering meaningful partnerships and economic activity with local and Indigenous communities.
In February 2026, Sirios acquired OVI Mining. This strengthened the Company’s leadership expertise in capital markets and project advancement while complementing Sirios’ longstanding technical and exploration strengths developed from operating for more than three decades in Québec’s Eeyou Istchee James Bay region.
In December 2025, Sirios announced 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 brings Sirios into the Osisko development ecosystem, strengthening the company’s leadership team with proven mine-building and capital markets expertise, while retaining Sirios’ long-standing geological knowledge of James Bay.
With over three decades of continuous exploration in the region and strong relationships with local and Indigenous communities, Sirios is well-positioned to unlock value through disciplined project advancement and exploration-driven growth.
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) in 2027 and ongoing exploration across the portfolio
Key Projects
Cheechoo Gold Project
The 100 percent owned Cheechoo gold project is Sirios’ flagship asset located in Eeyou Istchee James Bay, Québec, near existing infrastructure and operating mines. The project hosts a large, near-surface gold deposit with scalable, open-pit potential and higher-grade underground extensions.
A 2025 mineral resource estimate outlines approximately 3 million ounces of gold, including 1.3 million ounces indicated at 1.12 grams per ton (g/t) gold and 1.7 million ounces inferred at 1.23 g/t gold, which includes 446,000 ounces of underground resources grading 3.09 g/t gold. The deposit exhibits a low strip ratio of 2.9:1 and high metallurgical recoveries of approximately 92 percent, supporting favourable development characteristics.
In addition to the current resource, Cheechoo hosts a significant exploration target ranging from 31 to 40 million tonnes grading between 1.27 and 1.45 g/t gold, highlighting strong potential for further resource growth.
Site preparation work has been completed and the company has executed the first 25,000-meter drilling campaign at Cheechoo as of June 2026. Sirios’ ongoing work remains focused on expanding the resource base, targeted towards the end of 2026. The project continues to advance toward a preliminary economic assessment scheduled in 2027.
Corvet Est Gold Project
Corvet Est is a 6,500-hectare district-scale land package located east of Cheechoo within the same highly prospective James Bay geological corridor. The project comprises a historically drilled gold system that has seen limited modern exploration since 2012. Following consolidation by OVI Mining, Corvet Est now offers Sirios exposure to a large land package with multiple mineralized zones and significant upside potential.
Plex Gold Project
The PLEX project is a 21,000-hectare district-scale land package hosting the Orfée gold zone, characterized by multiple structural corridors and underexplored depth and strike potential. Historical drilling has confirmed gold mineralization, and Sirios plans to advance compilation, target refinement and exploration programs to unlock the project’s discovery potential.
Aquilon Gold Project
The Aquilon project is an optioned gold asset located in James Bay and hosts numerous high-grade gold showings, including some of the highest gold grades historically reported in Québec. Recent drilling has outlined a broad gold-mineralized halo with strong expansion potential. Exploration at Aquilon is currently being advanced in partnership with Sumitomo Metal Mining Canada, providing Sirios with continued exposure to exploration upside while limiting capital commitments.
Management Team
Dominique Doucet. – Executive Chairman
Dominique Doucet is a veteran of Québec’s mineral exploration industry with more than 40 years of experience, including over 30 years in the Eeyou Istchee James Bay region. He founded Sirios Resources and has led the discovery of several significant gold occurrences, including the Cheechoo and Aquilon deposits.
Jean-Félix Lepage – Chief Executive Officer
Jean-Félix Lepage is a mining engineer with over 15 years of experience in mine operations and project development. Prior to joining Sirios, he served as vice-president of Projects at O3 Mining, where he advanced the Marban project, and previously held senior operational roles at Newmont, including at the Éléonore mine.
Sean Roosen – Board Member
Sean Roosen is the founder and executive chairman of Osisko Development and former CEO of Osisko Gold Royalties. He played a central role in the discovery, financing and development of the Canadian Malartic mine and is widely recognized as a leader in the global mining industry.
Laurence Farmer – Board Member
Laurence Farmer is CEO of Electric Elements Mining and General Counsel and vice-president of corporate development at Osisko Development. He brings extensive experience across mining, law and finance, with a strong background in corporate transactions and resource development.
Jordi Turcotte - Senior Geologist and Cheechoo Project Manager
Jordi Turcotte is a professional geologist with over 15 years of experience in mineral exploration, with expertise in structural geology and geological modeling. He has been exposed to diverse resources such as gold, base metals, nickel, iron, diamonds, uranium, graphite, and rare earth elements.
