Radisson Mining Resources has released an updated Mineral Resource Estimate for its 100%-owned O’Brien Gold Project in Québec’s Abitibi region, reflecting substantial growth driven by recent step-out drilling. The update, effective January 31, 2026, reports Indicated resources at 0.63 million ounces of gold in 3.49 million tonnes grading 5.59 g/t Au, an 8% increase in ounces. Inferred resources surged 82% to 1.69 million ounces in 10.37 million tonnes at 5.08 g/t Au. This interim estimate incorporates drilling completed through December 31, 2025, using a US$2,500/oz gold price and 2.2 g/t Au cut-off, with a refined geological model. The company is midway through a fully funded 140,000-meter step-out program targeting mineralization to 2 km depth, with 25% complete as of late 2025, demonstrating high success in intersecting new high-grade zones and setting the stage for further resource increases.
Resource Growth Accelerates at O’Brien Amid Aggressive Exploration
The latest Mineral Resource Estimate for Radisson Mining’s O’Brien Gold Project marks a clear milestone in the company’s exploration strategy. This update captures the positive impact of deep step-out drilling that has successfully extended known high-grade gold mineralization well beyond previous limits, particularly beneath the historic mine workings.
The O’Brien project sits in the prolific Abitibi greenstone belt, a region renowned for world-class gold deposits. Historically, the site produced over 587,000 ounces of gold between 1926 and 1957 from 1.2 million tonnes at an average grade of 15.25 g/t Au, underscoring its high-grade pedigree. Modern exploration has built on this foundation, with the current program focusing on proving continuity and scale at greater depths.
Key details from the updated estimate highlight the following:
Indicated Mineral Resources : 0.63 Moz Au contained in 3.49 Mt grading 5.59 g/t Au. This represents an 8% increase in contained ounces compared to the prior estimate from May 2025.
Inferred Mineral Resources : 1.69 Moz Au contained in 10.37 Mt grading 5.08 g/t Au. The jump reflects an 82% rise in ounces, driven by a 55% increase in tonnage and a 17% improvement in average grade.
These figures are based on a conservative cut-off grade of 2.2 g/t Au, a long-term gold price assumption of US$2,500 per ounce, a minimum mining width of 1.2 meters, and a 90% gold recovery rate. The estimate benefits from an updated geological interpretation and improved capping strategies for high-grade intercepts, providing a more robust framework for future development planning.
The growth stems directly from the ongoing step-out drill program. Launched in 2025, this fully funded initiative totals 140,000 meters and aims to test the full vertical extent of the mineralized system down to 2 kilometers. As of December 31, 2025, approximately 25% of the program had been completed, including deep pilot holes and directional wedges that have intersected high-grade quartz-sulphide-gold veins in multiple parallel structures.
Notable aspects of the drilling include an impressive success rate in targeting previously untested areas. Many intercepts align with or exceed the grades and thicknesses seen in the existing resource base, confirming the persistence of the mineralizing system at depth. For instance, results from wedges off key pilot holes have delineated coherent vein systems over significant strike and vertical extents, often within alteration zones characteristic of the Piché Group rocks and surrounding lithologies.
This exploration approach has shifted the project’s profile from a near-surface focused asset—with about 75% of prior resources defined within 600 meters of surface—to one with demonstrated potential for substantial depth extensions. The updated model incorporates these new intersections, expanding the inferred category significantly while modestly boosting indicated ounces through better definition in select areas.
Looking at the broader context, the O’Brien deposit features multiple sub-parallel veins hosted within a favorable structural corridor. The step-out efforts have targeted open areas along strike and at depth, where mineralization remains untested. Success in these zones supports the view that the system is open in multiple directions, with an exploration target suggesting additional potential for 3 to 4 million ounces in 15 to 20 million tonnes at grades between 4.5 and 8.0 g/t Au to 2 km depth. While conceptual and not yet classified as resources, this target underscores the scale opportunity.
The company maintains a disciplined path forward, with plans for progressive resource updates as drilling advances. The remaining program—budgeted at around 72,500 meters for 2026 and 32,500 meters in the first half of 2027—will continue employing multiple rigs to systematically test extensions. This methodical approach has already delivered meaningful value by de-risking deeper portions of the deposit and enhancing overall project economics.
Previous technical assessments, including a 2025 Preliminary Economic Assessment, illustrated robust potential based on earlier resources, with strong after-tax NPV, high IRR, and low capital requirements. The current growth trajectory enhances these metrics further, positioning O’Brien as a high-grade, scalable opportunity in a premier mining jurisdiction with excellent infrastructure access.
Mineral Resource Summary Table
| Category | Tonnes (Mt) | Grade (g/t Au) | Contained Gold (Moz) | Change from Prior Estimate |
|---|---|---|---|---|
| Indicated | 3.49 | 5.59 | 0.63 | +8% in ounces |
| Inferred | 10.37 | 5.08 | 1.69 | +82% in ounces |
The parameters emphasize conservatism, with the higher gold price assumption reflecting current market conditions while the cut-off ensures focus on higher-quality material suitable for potential future underground mining.
Ongoing operations prioritize safety and efficiency, with no lost-time incidents reported over extended periods. The drilling leverages experienced contractors and local partnerships, supporting consistent progress.
This update reinforces Radisson’s commitment to unlocking O’Brien’s full potential through targeted, results-driven exploration. With mineralization proven at depth and the program well underway, the project continues to evolve as a standout story in the gold sector.
Disclaimer : This article is for informational purposes only and does not constitute investment advice, financial advice, or a recommendation to buy or sell securities. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Readers should conduct their own due diligence and consult qualified professionals before making investment decisions.