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Radisson updates O’Brien gold resource after step-out drilling
Radisson Mining Resources Inc. reported an updated Mineral Resource Estimate (MRE) effective January 31, . The estimate incorporates drilling results compiled through December 31, and a revised modelling approach using a 2.2 g/t Au cut-off at an assumed gold price of US$2,500/oz.
Who and what
The MRE was prepared by SLR Consulting (Canada) Ltd. and is based on a database containing 428,440 metres of drilling.
Radisson said the update reflects recent step-out drilling and modelling changes that materially affect resource classification.
When and where
The updated estimate is effective January 31, . Drilling results included in the MRE extend through December 31, . The work pertains to the O’Brien Gold Project, where Radisson is executing a regional exploration campaign.
Key findings and scale of the program
The company launched a fully funded, broad-scale step-out program of up to 140,000 metres designed to test mineralization to a depth of 2 kilometres. That campaign began in and is scheduled to continue through the first half of. At the time of the MRE, approximately 25% of the program was complete.
Under the revised parameters, Radisson reports an 82% increase in Inferred Mineral Resources and an 8% increase in Indicated Mineral Resources.
Why it matters for investors
In resource investing, location is everything: step-out drilling that expands lateral or depth extent can transform project scale and economics. Transaction data shows investors value both resource growth and improved classification that supports future mine planning.
The updated MRE, the increased inferred inventory and ongoing step-out work together push the project further along the exploration-led growth curve. The assumed US$2,500/oz price and the chosen 2.2 g/t Au cut-off will materially influence reported tonnes and grade, and therefore potential project valuation.
Next steps and implications
Radisson will continue the step-out program through the first half of. Further drilling results and additional modelling updates are likely to refine resource categories and inform subsequent technical studies.
The brick and mortar always remains: expanded, well-characterized mineral inventory is the primary driver of project value in the near term.
Reporting based on Radisson Mining Resources Inc. disclosure and the SLR Consulting (Canada) Ltd. MRE effective January 31.
Key results and what changed
Radisson’s updated estimate reports Inferred Mineral Resources of 10.37 million tonnes at 5.08 g/t Au, containing 1.69 million ounces of gold. It also reports Indicated Mineral Resources of 3.49 million tonnes at 5.59 g/t Au, containing 0.63 million ounces.
The revision reflects the combined effect of new drilling, validation of historic holes and adjustments to capping and modelling. assay capping was changed to 60 g/t Au applied to individual assays prior to compositing. Previously, a 40 g/t cap was applied to full-length composites.
Radisson and SLR describe the new capping as a prudent response to a narrow, high-grade vein system. The change increases fidelity of high-grade intervals without overstating grade continuity.
Modelling refinements also altered resource classification volumes and grade distribution. Those adjustments stem from updated geological interpretation and the integration of recent assay data.
The updated figures will inform future mine planning and economic assessments under the announced cut-off and price assumptions. Transaction data shows that resource revisions of this nature can materially affect project valuation and investor appetite.
How the drilling program is structured
Transaction data shows resource revisions can reshape project valuation and investor appetite. Against that backdrop, Radisson prioritizes area testing over density.
The company emphasizes wide step-outs rather than infill holes. Pilot holes are followed by wedges and directional holes to maximise the lateral area tested.
The expanded program was budgeted in three tranches: an initial 35,000 metres completed in, 72,500 metres planned for, and 32,500 metres scheduled for the first half of. The sequencing aims to accelerate coverage while managing rig availability and cost per metre.
The technical objective is to map the vertical and lateral continuity of quartz-sulphide-gold veins beneath historic workings. Drilling will also extend testing toward a 2 km exploration floor, seeking structural repeats and mineralised shoots that could materially change resource geometry.
In real estate, location is everything; in exploration, structural position and continuity are decisive. Transaction data and this drilling design together signal a push to convert spatial uncertainty into measurable value for investors.
Exploration target and success rate
Building on the earlier transaction and drilling discussion, Radisson reports an approximately 84% success rate in step-out holes intercepting classic O’Brien veins. The company says intercepted grades and widths align with the updated mineral resource estimate.
Since step-out drilling began in the fall of , Radisson defines an Exploration Target of an additional 5 Mt to 10 Mt at grades between 4.0 g/t and 6.0 g/t Au. Management equates that range to roughly 0.6 Moz to 2.0 Moz of potential gold. The company cautions the target is conceptual and requires additional drilling to be converted into a formal resource.
Technical basis and model assumptions
Radisson constrained the mineral resource estimate (MRE) to a wireframe vein model prepared by the company and reviewed by SLR. The model applies a minimum vein width of 1.2 metres and uses a block size of 5 x 2 x 5 metres. Estimation incorporated individual assay capping at 60 g/t Au and composited assays to vein full-width.
For economic and reporting inputs, the MRE assumes a 90% metallurgical recovery, a US$/C$ exchange rate of 1:1.33, and a C$215/t operating cost used in deriving the cut-off grade. Bulk densities were assigned by lithology and range between 2.76 and 2.87 t/m3. These parameters align the MRE with the project’s intended path toward modern underground mine design and potential mechanized mining methods.
The company cautions the target is conceptual and requires additional drilling to be converted into a formal resource. Transaction data shows the modelling choices prioritise reproducibility for underground extraction and preliminary mine planning.
Comparisons with prior work
Transaction data shows the modelling choices prioritise reproducibility for underground extraction and preliminary mine planning. Earlier mineral resource estimates and the Preliminary Economic Assessment (PEA) published in July used different cut-offs and capping approaches.
The March 2, MRE applied a 4.5 g/t cut-off at US$1,600/oz. A re-blocked estimate dated May 6, used a 2.2 g/t cut-off at US$2,000/oz for PEA optimisation. The current update adopts a 2.2 g/t cut-off at US$2,500/oz.
The update also incorporates 66,387 metres of new drilling and the validation of historic data. Those two elements together account for the substantial increases reported, notably within the Inferred category. The modelling and economic assumptions therefore explain much of the variance versus prior public statements.
Implications for development and next steps
Following the modelling and economic assumptions, Radisson presents the O’Brien system as a continuous vein network rather than a set of small, isolated high-grade shoots. The company says this geometry can support higher throughput and mechanized underground mining at scale.
The project benefits from existing regional infrastructure. That includes a shaft to 1,000 metres and nearby milling options that could shorten development timelines and lower upfront capital intensity.
Transaction data shows the modelling choices prioritise reproducibility for underground extraction and early mine planning. Radisson plans stepwise updates to the MRE as new drilling results are incorporated.
Resources remain subject to customary technical, permitting and economic risks. Further work is required to convert inferred material, refine geometry, complete metallurgical test work and advance environmental and permitting processes before any production decision.
In resource development, location is everything: existing access and processing options can materially affect project economics. Next steps will centre on additional drilling, resource upgrading, detailed engineering and regulatory milestones that will determine project timing and value.
Technical work was overseen by two qualified professionals. Richard Nieminen, P.Geo., served as Radisson’s qualified person for the technical program. Luke Evans, M.Sc, P.Eng., of SLR Consulting acted as the qualified person responsible for the mineral resource estimate (MRE).
Readers should note that mineral resources are not mineral reserves and do not yet demonstrate economic viability. Forward-looking statements in the release are subject to the risks and cautions set out in Radisson’s regulatory filings. Transaction data shows planned work will centre on additional drilling, resource upgrading, detailed engineering and regulatory milestones that will determine project timing and value.
