Radisson Continues to Expand Scope of Gold Mineralization at O’Brien with Latest Drill Results

Radisson Mining Resources Inc. (TSXV: RDS) (OTCQB: RMRDF) (“Radisson” or the “Company”) is pleased to announce assay results from fifteen new drill holes completed at its 100%-owned O’Brien Gold Project (“O’Brien” or the “Project”) located in the Abitibi region of Quebec. The fifteen holes represent step-outs below the existing geological model, east of the historic O’Brien Gold Mine (Figure 1) and are outside the scope of the recently completed Preliminary Economic Assessment (“PEA”, see Radisson news release dated July 9, 2025). All holes intersected gold mineralization in characteristic quartz-sulphide-gold veins, and thirteen of the holes returned intercepts with grades and thicknesses consistent with the Project’s existing mineral resources. These results continue to expand the scope of the Project’s known gold mineralization. Highlights include:

OB-24-363 intersected 8.41 grams per tonne (“g/t”) gold (“Au”) over 2.2 metres, including 14.40 g/t Au over 1.2 metres and 9.07 g/t Au over 1.8 metres, including 12.10 g/t Au over 0.9 metres;

OB-24-354 intersected 7.95 g/t Au over 2.30 metres, including 14.85 g/t Au over 1.0 metre;

OB-24-364 intersected 12.75 g/t Au over 1.4 metres and 11.15 g/t Au over 1.50 metres;

OB-24-361 intersected 3.50 g/t Au over 5.0 metres, including 8.96 g/t Au over 1.28 metres, and 15.10 g/t Au over 1.0 metre; and

OB-25-371W1 intersected 5.66 g/t Au over 3.0 metres, including 9.97 g/t Au over 1.5 metres.

Matt Manson, President and CEO, commented: “Our ongoing drilling at the O’Brien Project is focussed on “proof-of-concept” step-outs designed to test the full scope of the Project beyond previous drilling. We recently released the latest results from drilling beneath the historic O’Brien gold mine where we have been delineating multiple high-grade gold-bearing veins over a large area up to 500 metres below the base of the historic workings. Today’s news release shows results from drill holes located to the east of the historic mine, and below the existing mineral resources. Of note, several of the holes represent deep step-outs below our “Trend #2”, pushing the scope of known mineralization downwards by up to 300 metres in this important area. Our Exploration Target at O’Brien is between 3 and 4 million ounces of gold in 15 to 20 million tonnes at between 4.5 and 8.0 g/t Au. This is based on the proposition that O’Brien’s mesothermal gold mineralization continues to an exploration horizon of 2 kilometres depth. Today’s results continue to support this thesis. With the recent completion of our high-value, but “snap-shot”, PEA, our focus is on aggressive exploration and resource growth. Four rigs are currently active at the Project and drilling continues.”

The reader is cautioned that the potential quantity and grade of an Exploration Target is conceptual in nature, there has been insufficient exploration to define a mineral resource and that it is uncertain if further exploration will result in the target being delineated as a mineral resource.

Figure 1: Long Section and Plan View of Gold Vein Mineralization and Mineral Resources at the O’Brien Gold Project, with Today’s Drill Holes Illustrated

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10977/265432_bb2e887f64ce98f8_001full.jpg

O’Brien Mineral Resource Estimates

The Mineral Resource Estimate (“MRE”) utilized in the recent O’Brien PEA comprises Indicated Mineral Resources of 0.58 million ounces (2.20 million tonnes at 8.2 g/t Au) and Inferred Mineral Resources of 0.93 million ounces (6.67 million tonnes at 4.4 g/t Au)1. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. This MRE, effective as of May 6, 2025, is based on the Project’s March 2023 estimate re-blocked with an updated cut-off yielding more ounces and more tonnes at a lower average grade. As such, it is based on drilling completed only to the end of 2022. By the end of the current fully funded 50-60,000 drill program, an additional 90-100,000 metres of drilling will be available for an updated estimate, including a significant meterage of drilling outside the scope of the current MRE and the recent PEA mine design.

Gold Mineralization at O’Brien

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 Piche Group occurring in contact with the east-west oriented Larder Lake-Cadillac Break (“LLCB”). Gold, along with pyrite and arsenopyrite, is typically associated with shearing and a pervasive biotite alteration, and developed within multiple Piche 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. Multiple veins occur sub-parallel to each other, as well as sub-parallel to the Piche lithologies and the LLCB. Individual veins have well-established lateral continuity, with near-vertical, high-grade shoots developed over significant lengths. Based on the historic data available, it is clear that the former mine was “high-graded”, with mining focussed on a main central stope and parallel veins identified but left undeveloped.

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 focussed 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”).

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, Quebec. 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 “O’Brien Gold Project Technical Report and Preliminary Economic Assessment, Quebec, Canada” effective June 27, 2025, 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.

For more information on Radisson, visit our website at www.radissonmining.com or contact:

Matt Manson
President and CEO
416.618.5885
mmanson@radissonmining.com

Kristina Pillon
Manager, Investor Relations
604.908.1695
kpillon@radissonmining.com

Read more: https://www.acnnewswire.com/press-release/english/102457/