Radisson Mining Resources Inc. announced 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 Québec. The fifteen holes represent step-outs below the existing geological model, east of the historic O'Brien Gold Mine and are outside the scope of the recently completed Preliminary Economic Assessment. 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. existing geological model, east of the historic O'Brien Gold Mine and are outside the scope of the recently completed Preliminary Economic Assessment.
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: 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.
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) . 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 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 ("LLCB").
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. Multiple veins occur sub-parallel to each other, as well as sub-parallel to the Piché 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").
