Radisson's O'Brien Gold Project Delivers Promising Deep Drill Data, Continues Expanding Mineralized Zone Below Historic Mine

Radisson Mining Resources Inc. (TSXV: RDS, OTCQX: RMRDF) has released assay outcomes from the latest drilling phase at its wholly-owned O’Brien Gold Project in Quebec’s Abitibi region. The company unveiled results from six drill holes completed as part of its expansive 140,000-metre exploration program targeting the full scope of gold-bearing systems beneath the former O’Brien Gold Mine.

Strong Performance Continues

All six holes intersected mineralization, with five returning grade intervals matching the Project’s established mineral resource parameters—maintaining an 82% hit rate across 74 completed holes. The drilling achievement represents a systematic approach to testing the depth and breadth of the gold system.

Among the standout intercepts:

• OB-25-337W13 encountered notably rich ore: 90.60 g/t Au over 1.0m within broader mineralization averaging 30.59 g/t Au across 3.0m, plus an additional 9.14 g/t Au over 2.7m (including 16.35 g/t Au over 1.4m)

• OB-25-337W12 intersected three separate mineralized intervals: 25.10 g/t Au over 1.5m; 14.20 g/t Au over 1.5m; and 11.40 g/t Au over 1.3m

• OB-25-322 wedge series (W1 and W2) revealed consistent ore quality over significant vertical separation: W1 returned 4.02 g/t Au over 4.5m including 8.29 g/t Au over 1.5m; W2 showed 3.11 g/t Au over 8.0m with internal zones grading 5.93-6.33 g/t Au

Systematic Exploration Beneath Historic Workings

The pilot hole OB-24-337, drilled below the former mine’s lowest stope for the first time since 1957, has become the cornerstone of this discovery phase. Now with thirteen completed wedges branching from this pilot hole, the exploration team has delineated up to six distinct gold-bearing veins spanning approximately 250 metres horizontally and 500 metres vertically—with the system remaining open at depth.

The geometry mirrors what mine records show: the historic operation produced over 500,000 ounces of gold at average grades exceeding 15 g/t Au over a 1,000-metre vertical range, but focused only on a central stope, leaving adjacent mineralized trends largely untested.

Extending Known Boundaries

According to Matt Manson, President and CEO: “Our deep exploration program is systematically pushing both downward and laterally from the historic mine footprint. The consistent recovery of high-grade quartz-sulphide veins within alteration halos suggests we’re encountering the same vein architecture that produced ore historically—but we’re now testing it across a much broader area and at depths previously inaccessible.”

The drilling has identified a repeating pattern of ore-bearing zones labeled Trend #0 through Trend #5. Recent work on the deeper extensions of Trend #1 and Trend #2 has filled previously untested ground, with the company viewing apparent “gaps” between trends as a consequence of drilling density rather than mineralization absence.

Operational Scale and 2026 Plans

As of early 2026, Radisson has seven active drill rigs on site with an eighth unit coming online. Twelve additional step-out holes have been drilled and await assay processing, including the final OB-24-337 wedges. The company’s resource estimate (May 2025) identifies 0.58 million ounces indicated resource at 8.2 g/t Au (2.20 million tonnes) with 0.93 million ounces of inferred resource at 4.4 g/t Au (6.67 million tonnes).

The Project was described in a July 2025 Preliminary Economic Assessment as a low-cost, high-value development scenario with 11-year mine life and material exploration upside potential based on existing regional mining infrastructure.

Technical Framework

The O’Brien mineralization occurs within narrow bands of mafic volcanics, conglomerates, and porphyritic sills of the Piché Group bordering the east-west trending Larder Lake-Cadillac Break. Gold precipitation is associated with shearing, biotite alteration, pyrite, and arsenopyrite. Veins typically range from several centimetres to several metres thick, stacked sub-parallel to lithological contacts and the regional fault structure, with vertical high-grade shoots showing well-established lateral continuity.

All drill core was NQ diameter. Half-core samples underwent standard fire assay with atomic absorption finish at ALS Lab in Val-d’Or, Quebec. Samples exceeding 10 g/t Au were reanalyzed using fire assay with gravimetric finish; zones displaying visible gold received metallic sieve analysis.

For additional technical details, Richard Nieminen, P.Geo., QC (geological consultant and qualified person under NI 43-101) supervised preparation of technical disclosure. Luke Evans, M.Sc., P.Eng. of SLR Consulting prepared the mineral resource estimate.