Announcement • Sep 04

Radisson Mining Resources Continues To Intersect High-Grade Gold Mineralization In The Trend 1-Trend 2 Gap At O'Brien

Radisson Mining Resources Inc. has announced the results of six new drill holes recently completed at its 100%-owned O'Brien Gold Project located in the Abitibi region of Québec. The six holes represent new wedge branches targeting the 'Trend 1-Trend 2 Gap', an area of little previous drilling extending over an approximate 800-metre vertical extent in the central portion of the Project. All have returned significant intercepts of high-grade gold mineralization. These results are the latest from the Company's ongoing 140,000-metre step-out drill program and continue to extend the scope of gold mineralization beyond the Company's March 2026 Mineral Resource Estimate. OB-26-386W4 intersected 52.34 grams per tonne gold over 3.0 metres (core lengths) including 154.95 grams per tonne gold over 1.0 metre, and 3.82 grams per tonne gold over 10.2 metres including 9.98 grams per tonne gold over 3.0 metres, and 9.39 grams per tonne gold over 2.0 metres including 11.50 grams per tonne gold over 1.0 metre. OB-26-387W7 intersected 10.62 grams per tonne gold over 4.7 metres including 40.90 grams per tonne gold over 1.1 metres, and 29.34 grams per tonne gold over 1.0 metre, and 6.43 grams per tonne gold over 3.0 metres including 8.20 grams per tonne gold over 2.0 metres. OB-26-386W5 intersected 5.37 grams per tonne gold over 4.2 metres including 14.38 grams per tonne gold over 1.2 metres. OB-26-386W6 intersected 6.14 grams per tonne gold over 3.7 metres including 11.11 grams per tonne gold over 1.0 metre. The O'Brien Gold Project Mineral Resource Estimate effective January 31, 2026 utilizes a 2.20 grams per tonne gold bottom cut-off, a USD 2,500 gold price, a minimum mining width of 1.2 metres, and a 60 grams per tonne gold upper cap on individual assays. Intercepts presented in Table 1 are calculated with a 3.00 grams per tonne gold bottom cut-off. Sample grades are uncapped. True widths, based on depth of intercept and drill hole inclination, are estimated to be 30-80% of core length. Table 3 presents additional drill intercepts calculated with a 1.00 grams per tonne gold bottom cut-off over a minimum 1.0 metre core length so as to illustrate the frequency and continuity of mineralized intervals within which high-grade gold veins at O'Brien are developed. Gold mineralizing quartz-sulphide veins at O'Brien occur within a thin band of interlayered mafic volcanic rocks, conglomerates, and porphyritic andesitic sills of the Piché Group occurring in contact with the east-west oriented Larder Lake-Cadillac Break. Gold, along with pyrite and arsenopyrite, is typically associated with shearing and a pervasive biotite alteration, and developed within multiple Piché Group lithologies and, occasionally, the hanging-wall Pontiac and footwall Cadillac meta-sedimentary rocks. As mapped at the historic O'Brien mine, and now replicated in the modern drilling, individual veins are generally narrow, ranging from several centimetres up to several metres in thickness and are associated with broader, mineralized alteration envelopes. Multiple veins occur sub-parallel to each other, as well as sub-parallel to the Piché lithologies and the Larder Lake-Cadillac Break. Individual veins have well-established lateral continuity, with steeply plunging grade shoots developed over significant lengths. The historic O'Brien mine produced over half a million ounces of gold from such veins and shoots at an average grade exceeding 15 grams per tonne gold and over a vertical extent of at least 1,000 metres. Modern exploration has focussed on delineating well-developed vein mineralization below and to the east of the historic mine. Since the end of 2024, Radisson has been pursuing a program of broad step-outs beneath the historic O'Brien Gold mine and the existing mineral resources designed to test the extent of gold mineralization at the Project. This drilling is accomplished with pilot holes followed by wedges and directional drilling to maximize drill efficiency and minimize costs. In October 2025, Radisson announced the expansion of the step-out drill program to 140,000 metres employing eight drill rigs. The origin of the step-out drill program was the deep pilot hole OB-24-337, which was the first exploration drill hole located below the former mine workings since mining ended in 1957. This hole intersected 31.24 grams per tonne gold over 8.0 metres, including 242.0 grams per tonne gold over 1.0 metre at approximately 1,500 metres vertical depth. Fifteen wedge branches were completed from OB-24-337 delineating up to eight gold-bearing veins over a 250-metre by 700-metre area in what is referred to as 'O'Brien Mine East'. In March 2026, Radisson published an interim update in the Project's mineral resources, showing meaningful growth based on the on-going drilling. The focus of the step-out drill program has been the extension of mineralization at depth, with an exploration floor of 2 kilometres depth, and recently announced plans to extend this drilling to 2.5 kilometres depth. Given the character of neighbouring gold deposits and the wealth of mining infrastructure within or close to the O'Brien Gold Project, Radisson believes that significant exploration potential exists to these depths, and such mineralization might reasonably be expected to be developed. In addition to the progressively deeper drilling, the 140,000-metre program includes targeting of areas within the O'Brien geological model that have not previously been tested and offer the potential for additional mineral resources at shallower depths. As exploration drilling at O'Brien has progressed over the last several years, high-grade intercepts and vein delineations have typically been followed up with additional drilling on steep east plunging trends. This exploration strategy has resulted in a number of large-scale mineralization 'Trends 0 to 5' being delineated, with intervening 'gaps'. These gaps are typically defined by a lack of drilling rather than a lack of mineralization. Significant gaps include between the former mine and 'Trend 0', and a gap of 800 metres vertical extent between 'Trends 1 and 2'. Pilot holes OB-26-386 and OB-26-387 were established to target the Trend 1-Trend 2 Gap at approximately 500 and 1,000 metres vertical depth. Thirteen directional wedge branches have now been completed from the two pilot holes for a total of fifteen cuts through the Piché Group.

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Radisson Mining Resources Continues To Intersect High-Grade Gold Mineralization In The Trend 1-Trend 2 Gap At O'Brien

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