Radisson Mining Resources Inc. (TSX-V: RDS) (OTCQB: RMRDF) is pleased to announce the discovery of a significant occurrence of coarse visible gold in a new surface trench excavated at its 100%-owned O’Brien Gold Project located in the Abitibi region of Québec. The trench is the first of several planned for the summer exploration program at O’Brien and is located just thirty metres east of the O’Brien core shack and office complex, close to the projected surface extension of the celebrated “Jewellery Box” zone.

Figure 1: Coarse visible gold in Quartz-Sulphide-Gold Veining in Piché Group rocks, Trench OB-25-TR001, O’Brien Gold Project. Looking east.

Matt Manson, President & CEO, commented: “Coarse visible gold in drill core is not unusual at the O’Brien Gold Project. Here we are reporting a notable example in a surface trench, found under light overburden immediately adjacent to the Project’s office facilities. The trench was opened to provide exposure to Piché Group rocks in the hanging-wall of Cadillac-Larder Lake Break and to better understand the morphology and continuity of O’Brien’s quartz-sulphide-gold veins. We did not expect the first trench to return such a world-class example of “under-foot” gold mineralization. This discovery is reminiscent of the historic prospecting experience in the Abitibi and illustrates the continued discovery potential of the region, even in the shadow of existing infrastructure.”

Matt Manson continued: “The trench location is close to the interpreted surface projection of the “Jewellery Box” zone, a vertical and narrow mining stope in the historic O’Brien Gold Mine noted for extremely high grades and museum-quality gold samples. In December, Radisson reported the likely rediscovery of the Jewellery Box with a drill intercept of 643.1 grams per tonne (“g/t”) gold (“Au”) over 2.1 metres, including 1,345.0 g/t Au over 1.0 metre at approximately 200 metres vertical depth (see Radisson News Release dated December 9, 2024). Today’s news confirms an extremely rich gold mineralizing environment in and around this zone, including at surface. This area is outside the scope of the Project’s Mineral Resources and the recently published Preliminary Economic Assessment (see Radisson News Release dated July 9, 2025). Additional trenching is planned as part of our summer exploration program, and the discovery site has been secured against unauthorized access.”

 Figure 2: Host of the coarse visible gold occurrence and the classic setting of O’Brien gold mineralization exposed in Trench OB-25-TR001: a three-metre wide zone of Quartz-Sulphide-Gold veining with a Z-fold, within an envelop of high-strain, biotite alteration and semi-massive sulphides. Hosted within units of the Piché Group (“TX”: Crystal Tuff, “S3p”: Conglomerate). Looking east.

Qualified Persons 

Disclosure of a scientific or technical nature in this news release was prepared under the supervision of Mr. Richard Nieminen, P.Geo, (QC), a geological consultant for Radisson and a Qualified Person for purposes of NI 43-101. Mr. Luke Evans, M.Sc., P.Eng., ing, of SLR Consulting (Canada) Ltd., is the Qualified Person responsible for the preparation of the Mineral Resource Estimate at O’Brien. Each of Mr. Nieminen and Mr. Evans is independent of Radisson and the O’Brien Gold Project.

About Radisson Mining

Radisson is a gold exploration company focused on its 100% owned O’Brien Gold Project, located in the Bousquet-Cadillac mining camp along the world-renowned Larder-Lake-Cadillac Break in Abitibi, Québec. A July 2025 Preliminary Economic Assessment described a low cost and high value project with an 11-year mine life and significant upside potential based on the use of existing regional infrastructure. Indicated Mineral Resources are estimated at 0.58 million ounces (2.20 million tonnes at 8.2 g/t Au), with additional Inferred Mineral Resources estimated at 0.93 million ounces (6.67 million tonnes at 4.4 g/t Au). Please see the NI 43-101 “Technical Report on the O’Brien Project, Northwestern Québec, Canada” effective March 2, 2023 and other filings made with Canadian securities regulatory authorities available at www.sedarplus.ca for further details and assumptions relating to the O’Brien Gold Project.