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Radisson Mining Resources has drilled into a previously untested gap between two known mineralized trends at its O'Brien gold project near Rouyn-Noranda, returning high-grade gold intercepts that the company says begin to answer whether those trends represent real structural controls or simply patchy drill coverage.
The new results come from two pilot holes — OB-26-386 and OB-26-387 — and five associated directional wedge branches, all targeting the "Trend 1-Trend 2 Gap" at roughly 500 m and 1,000 m vertical depth. All seven of the holes hit gold mineralization, with six of seven returning grade and width consistent with the project's mineral resources.
Highlights include 7.57 g/t gold over 9.7 m (including 52.75 g/t over 1.1 m) in OB-26-387W2; 3.43 g/t gold over 13.4 m (with three 1-m vein intervals grading 8.63 g/t, 10.26 g/t and 8.24 g/t) in OB-26-386W1; 66.93 g/t gold over 1.0 m together with 24.97 g/t over 1.0 m in OB-26-387W3; and 69.05 g/t gold over 1.0 m together with 5.28 g/t over 1.0 m in OB-26-387W4. The mineralization sits in the project's characteristic quartz-sulphide-gold veins and alteration envelopes hosted within conglomerate, porphyry and mafic volcanic units.
"Today's results, targeting the important 'Trend 1-Trend 2 Gap' which has a top to bottom expression, are the latest from our step-out drill program and continue to extend the scope of gold mineralization beyond the company's recent updated March 2026 mineral resource estimate," said president and CEO Matt Manson. He noted that previous drilling at O'Brien had defined steeply plunging mineralization within a series of repeating "Trends" with "Gaps" between them, and that "an outstanding question has been whether these Trends reflect actual, large-scale structural controls on mineralization or are simply a feature of insufficient drilling." Additional results from further wedges in the Trend 1-Trend 2 Gap, and from deeper drilling below the historical mine workings, are expected shortly.
The new drilling extends a broad step-out program that Radisson has been running beneath the historic O'Brien mine and the current resource. The company uses pilot holes followed by directional wedges to maximize drill efficiency, and in October 2025 expanded the program to 140,000 m using up to eight rigs. The first exploration hole drilled below the former mine workings since production ended in 1957, OB-24-337, intersected 31.24 g/t gold over 8.0 m, including 242.0 g/t over 1.0 m, at roughly 1,500 m vertical depth.
The historic O'Brien mine produced more than half a million ounces of gold from quartz-sulphide veins and shoots at an average grade above 15 g/t over a vertical extent of at least 1,000 m. Modern exploration has focused on delineating well-developed vein mineralization east of the historic mine within a series of repeating trends labelled Trend 0 through Trend 5.