O'Brien Gold Project Demonstrates Persistent High-Grade Mineralization: Radisson Expands Deep Drilling beneath Historic Mine

Strategic Expansion of Gold Mineralization Below Historic Workings

Radisson Mining Resources Inc. (TSXV: RDS) has released drilling results that continue to validate the significant mineral potential beneath the O’Brien Gold Mine in Quebec’s renowned Abitibi district. The latest assay data from six newly completed holes represents another chapter in the company’s aggressive 140,000-metre exploration campaign, which has now achieved an impressive 82% success rate in intersecting mineralization.

The most notable result comes from directional wedge OB-25-337W13, which encountered 90.60 grams per tonne of gold across a 1.0-metre interval within a broader 3.0-metre zone averaging 30.59 g/t Au. This intercept was recovered at approximately 862-865 metres depth and exemplifies the high-grade quartz-sulphide vein system that characterizes the project. The parallel wedge from the same pilot hole (OB-25-337W12) returned three separate intercepts grading 25.10, 14.20, and 11.40 g/t Au respectively, demonstrating the predictability of the mineralization geometry.

Systematic Vein Architecture Emerging from Deep Drilling

The exploration model has identified up to six distinct veins distributed across a 250-metre east-west by 500-metre vertical mineralization envelope beneath the former stope. These veins occur within interlayered sequences of mafic volcanic rocks, conglomerates, and porphyritic basalt andesitic sills of the Piché Group, positioned in contact with the Larder Lake-Cadillac Break—a prolific regional fault structure. The porphyritic basalt component of the host rock package appears to host significant portions of the gold-bearing intervals, providing a reliable lithological indicator for mineralization.

Two additional wedges from pilot hole OB-24-322 intersected the downward extension of Trend #1 at vertical depths of 1,280 and 1,360 metres. The first wedge (OB-25-322W1) returned 4.02 g/t Au over 4.5 metres including 8.29 g/t Au over 1.5 metres, while OB-25-322W2 produced an 8.0-metre zone grading 3.11 g/t Au, featuring a narrower 1.5-metre high-grade shoot at 5.93 g/t Au. The geometric consistency between these intercepts over an 80-metre vertical separation suggests a single mineralized domain, supporting resource expansion potential.

Resource Context and Mine Planning Implications

The O’Brien project currently hosts Indicated Mineral Resources of 0.58 million ounces (2.20 million tonnes at 8.2 g/t Au) with an additional 0.93 million ounces classified as Inferred resources. The 2025 Preliminary Economic Assessment outlined an 11-year mine operation utilizing existing regional infrastructure, with the deep drilling campaign now testing extensions well beyond the original resource envelope. The historic mine, which produced over 500,000 ounces at average grades exceeding 15 g/t Au, was selectively worked, with parallel vein systems left unextracted—providing substantial exploration upside.

Drilling Acceleration and 2026 Program Scale

With seven drill rigs currently active at site and an eighth rig being deployed, Radisson is executing one of the region’s most intensive exploration programs. To date, 74 holes totaling approximately 50,000 metres have been completed, with 61 holes intersecting mineralization consistent with resource parameters. Twelve additional step-out holes, including the final wedges from OB-24-337, have been drilled and await assay results. The program’s design—utilizing pilot holes followed by directional wedges—maximizes drill efficiency while systematically expanding the known mineralization footprint downward to potential depths exceeding 2 kilometres.

The seventh wedge from Trend #2 (OB-25-371W7) intersected three narrow mineralization zones on the western mineralized contact, further confirming the lateral continuity of vein systems across the property. A notable gap between Trend #2 and Trend #1 at depth is interpreted as a function of drill coverage rather than geological boundaries, representing a near-term exploration opportunity at shallow depths compatible with existing mine design parameters.

Quality Assurance and Independent Verification

All core samples underwent standard fire assay procedures with atomic absorption finishing at ALS Laboratory Ltd in Val-d’Or. High-grade intercepts exceeding 10 g/t Au received confirmatory analysis via gravimetric finish. Visible gold mineralization was quantified using metallic sieve procedures. The program incorporated systematic QA/QC protocols including reference standards, blanks, and duplicates, with results supervised by independent qualified persons under NI 43-101 standards.