Radisson Mining reports highest grade intercepts to date below Historic O’Brien Gold Mine, Quebec

Radisson Mining Resources Inc. [TSXV: RDS; OTCQB: RMRDF] reported assay results from new drill holes completed at its 100%-owned O’Brien Gold Project located in the Abitibi region of Québec.

Four of the drill holes reported today are wedges completed from the previously reported pilot hole OB-24-337, the deepest hole ever drilled at the Project and the first drilled directly below the historic O’Brien Mine workings. This pilot hole, and the first three wedge-extensions drilled from it (OB-24-337W1 to W3) all returned multiple, high-grade gold intercepts, delineating a large zone of gold-bearing veins with good continuity. Now, an additional four wedges (OB-25-337W4 to W7) demonstrate the scale of this zone with the highest-grade intercepts yet achieved. Highlights include OB-25-337W7 that intersected 89.36 g/t gold over 3.7 metres, including 293.0 g/t Au over 1.1 metres and 16.43 g/t Au over 8.1 metres, including 60.75 g/t Au over 2.1 metres and 9.69 g/t Au over 1.3 metres.

OB-25-337W5 intersected 47.70 g/t Au over 1.0 metre and 5.25 g/t Au over 4.0 metres, including 17.90 over 1.0 metres. OB-25-337W6 intersected 6.45 g/t Au over 3.5 metres, including 18.80 g/t Au over 1.0 metre and 3.57 g/t Au over 12.0 metres, including 6.51 g/t Au over 1.0 metre and 3.70 g/t Au over 4.4 metres, including 7.11 g/t Au over 1.5 metres.

Radisson also reported results from 10 shallower holes drilled adjacent to the historic mine workings on “Trend #0”, including drill holes in and around the former “Jewellery Box” zone. Recall that drill hole OB-24-347 returned 643.1 g/t Au over 2.1 metres, including 1,345.0 g/t Au over 1.0 metre on what is interpreted to be the near surface upwards extension of the famous high-grade and narrow mining stope. Highlights include OB-25-370 that intersected 4.32 g/t Au over 6.5 metres, including 10.49 g/t Au over 2.1 metres. OB-25-372 intersected 7.05 g/t Au over 2.5 metres, including 15.95 over 1.0 metre.

Matt Manson, President & CEO, commented: “Since last December, we have been reporting the delineation of a series of high-grade gold-bearing veins developed over a large area up to 500 metres below the base of the historic O’Brien Gold Mine. In today’s news release we are reporting the highest-grade intercepts returned to date from this area, with the results of four new wedges drilled from our initial pilot hole. We are now delineating up to six mineralized zones over hundreds of metres, which appear related to mapped veins at the base of the former mine and which are outside the scope of conceptual mine plan contained in our recently reported Preliminary Economic Assessment.

“A priority of our ongoing 50-60,000 metre drill program at O’Brien is large step-outs below the current mineral resources and the historic mine in a ‘proof-of-concept’ approach to test the potential extension of the O’Brien mineralizing system to 2 km depth. To date, this strategy has been remarkably successful, with important implications for the future scale of the project.”

Matt Manson continued: “We are also reporting today several shallower drill holes targeting the surface projection of the famous “Jewellery Box Zone”, rediscovered by Radisson with bonanza grades late last year, as well as the downward extension of our mineral resource block model on “Trend #0″ adjacent to the Jewellery Box stope. Both target areas have returned high-grade intercepts, demonstrating extensive gold mineralization in and around this target area.”

The historic O’Brien mine produced over half a million ounces of gold from such veins and shoots at an average grade exceeding 15 g/t Au and over a vertical extent of at least 1,000 metres. Modern exploration has focused on delineating well developed vein mineralization to the east of the historic mine, with additional high-grade shoots becoming evident in the exploration data over what has been described as a series of repeating trends (Trend #s 0 to 5).

Since the end of 2024, Radisson has been delineating a series of high-grade veins beneath the historic workings of the O’Brien mine with a series of wedge-extensions drilled from the pilot hole OB-24-337, which intersected 242.0 g/t Au over 1.0 metre within a mineralized interval that averaged 31.24 g/t Au over 8.0 metres at approximately 1,500 metres vertical depth.

With today’s news release, assay results from a total of 7 wedges have now been reported and up to six gold-bearing veins have been delineated over an area of approximately 250 metres (east-west) by 250 metres (vertical). These veins appear to correspond to veins mapped at the base of the historic mine at 1,000 metres deep, approximately 300 to 500 metres above the new intercepts.

Based on drilling complete to the end of 2022, and a recently published Preliminary Economic Assessment for the project, it has estimated Indicated Mineral Resources of 0.58 million ounces (2.20 million tonnes at 8.2 g/t Au), with additional Inferred Mineral Resources of 0.93 million ounces (6.67 million tonnes at 4.4 g/t Au).

Radisson is a gold exploration company focused on its 100%-owned O’Brien Gold Project, located in the Bousquet-Cadillac mining camp along the 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 oz (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).