Slide 1: The O'Brien Gold Project: A New Vision for an Historic High-Grade Gold Mine
The O'Brien Gold Project A New Vision for an Historic High-Grade Gold Mine in Québec's Abitibi Corporate Update, December 2025 TSXV:RDS OTCQX:RMRDF
Slide 2: Cautionary Statement Regarding Forward-Looking Information
TSXV : RDS OTCQX : RMRDF 2 Cautionary Statement Regarding Forward-Looking Information This presentation contains "forward-looking information" within the meaning of the applicable Canadian securities other risks of the mining industry; delays in obtaining governmental approvals or financing; risks r
Slide 3: Cautionary Statement Regarding Forward-Looking Information
TSXV : RDS OTCQX : RMRDF 3 Cautionary Statement Regarding Forward-Looking Information Qualified Persons All-in Sustaining Cost (AISC) and AISC per Ounce Disclosure of a scientific or technical nature in this presentation was prepared under the supervision of Mr. Richard AISC is reflective of all of
Slide 4: High-Grade. Growing. Québec's Abitibi.
TSXV : RDS OTCQX : RMRDF 4 WHY RADISSON A HIGH-GRADE RESOURCE (EFFECTIVE MAY 2025)1 High-Grade. Exploring the Historic O’Brien Gold Project in Québec’s Abitibi Growing. 0.58 Moz Ind. 0.93 Moz Inf. (2.2Mt at 8.2 g/tAu) (6.7 Mt at 4.4 g/t Au) Québec’s Abitibi. A GROWING PROJECT WITH AN ACTIVE DRILL PR
Slide 5: Management
TSXV : RDS OTCQX : RMRDF 5 Pierre Beaudoin Peter MacPhail | Director Board Chairperson § 35+ years of mining experience. Formerly COO (2015- 2022) of Alamos Gold, Aurico and Northgate Minerals. § 30+ years of mining experience. § Formerly COO (2018-2024) of SilverCrest Metals Inc. for Las Chipas Pro
Slide 6: A History of Hub-and-Spoke Mining Complexes
TSXV : RDS OTCQX : RMRDF 6 QUÉBEC’S ABITIBI A History of Hub-and- Spoke Mining Complexes N Mines and Mining Services in Québec’s Abitibi (+100 Moz Au endowment) O’Brien Project Positioned within the 25 Moz Cadillac- Doyon- Bousquet Camp on the Cadillac-Larder ROUYN- Westwood LaRonde Lake Break NORAN
Slide 7: O'Brien Gold Project
TSXV : RDS OTCQX : RMRDF 7 LaRonde Westwood- Doyon O’Brien Gold Project
Slide 8: O'Brien 2025 PEA: Basis of Study
TSXV : RDS OTCQX : RMRDF 8 Westwood- O’Brien 2025 PEA: Basis of Study Doyon Complex Assumes off-site toll milling based on the results of a recent milling assessment and metallurgical study that demonstrated the potential LaRonde compatibility of the nearby Doyon gold mill, part Complex of IAMGOLD C
Slide 9: O'Brien 2025 PEA: Summary Results
TSXV : RDS OTCQX : RMRDF 9 O’Brien 2025 PEA: Summary Results Value (After Tax)1 Assumptions US$2,550 Au US$4,000 Au Gold Price, Stope Optimization & MRE US$2,000/oz Au NPV5% C$532M C$1,188M Gold Price, Financial Analysis US$2,550/oz Au IRR 48% 100% US$:C$ F/X $0.73 Payback (years) 2.0 0.7 Conceptual
Slide 10: O'Brien 2025 PEA: Metallurgy and Doyon Milling Assessment
TSXV : RDS OTCQX : RMRDF 10 O’BRIEN PEA BASED ON OFF-SITE MILLING O’Brien 2025 PEA: Metallurgy and Doyon Milling Assessment Westwood Sept 2024: MOU with IAMGOLD for milling assessment -Doyon at the Doyon Mill (Non-binding, Non-exclusive)1 Milling Assessment 86% to 96% recovery with flow sheet option
Slide 11: O'Brien 2025 PEA: Underground Mine Design
TSXV : RDS OTCQX : RMRDF 11 O’Brien 2025 PEA: Underground Mine Design Long hole stoping with cemented rock backfill. 2.2m minimum and 2.7m average stope widths Stope Optimization at US$2,000/oz Au 11 year Life. Years 2–8: 1,160 tpd prod. stopes PEA contemplates 2,000 tpd of mill capacity Hence, all
Slide 12: Exploration and Growth: Cadillac-Bousquet District
TSXV : RDS OTCQX : RMRDF 12 Exploration and Growth: Cadillac-Bousquet District O’Brien Project e nd ro La
Slide 13: O'Brien Inferred Resource 932,000 oz
TSXV : RDS OTCQX : RMRDF 13 5.2 Km W WEST O’BRIEN O’BRIEN EAST O’BRIEN E Thompson Cadillac Kewagama Surface 75% of existing - 250m Mineral Resource 700 m -600m 1750 m - 500m Open Trend 5 - 750m 100% Trend 4 -900m Trend 3 MRE for PEA, 2.2 g/t Au Cutoff Trend 2 - 1000m (US$2,000, 1.2m minimum width, 9
Slide 14: Deep Exploration and Growth: Proof of Concept Drill Results
TSXV : RDS OTCQX : RMRDF 14 Deep Exploration and Growth: Proof of Concept Drill Results As of October 2025, multiple deep drill holes + wedges have intersected high-grade mineralization in multiple locations A 140,000m step-out drill program with up to 8 drill rigs is ongoing to test the full potent
Slide 15: Vein Modelling in Support of Ongoing Exploration
TSXV : RDS OTCQX : RMRDF 15 Vein Modelling in Support of Ongoing Exploration Drilling completed since end-2022 has validated the existing geological model Dynamic vein modelling is used to guide new pilot holes and drill wedges with directional drilling Deep step-out drilling is resolving up to six
Slide 16: Significant Mineralization Extension Beneath Historic Mine
TSXV : RDS OTCQX : RMRDF 16 Significant Mineralization Extension Beneath Historic Mine July 16, 2025: seven wedges from pilot drill hole OB-337-24 up to 500m beneath the historic O’Brien Mine All holes intersected multiple veins with high-grade New 250mx250m zone of mineralization shows clear contin
Slide 17: Continuity of Mineralization Below Mine West and Trend 2
TSXV : RDS OTCQX : RMRDF 17 Continuity of Mineralization Below Mine West (L) and Trend 2 (R)
Slide 18: 12 Month Drilling Success Rate
TSXV : RDS OTCQX : RMRDF 18 WHY RADISSON Drill Results Reported Over the Last 12 Months 12 Month Drilling “Hit” Success Rate News Release Holes Reported1 (Contains >3g/t Vein “Hit” % Best Intercept2 Intercept)2 28th Oct 25 15 13 87% OB25-371W5 10.5g/t Au over 6.5m 8th Sept 25 15 13 87% OB24-363 8.4
Slide 19: December 9, 2024: 1.35 kg/t Au at Re-Discovered Jewelry Box
TSXV : RDS OTCQX : RMRDF 19 December 9, 2024: 1.35 kg/t Au at Re-Discovered Jewelry Box OB-24-347: 1,345 g/t Au over 1 metre (within 643.1 g/t over 2 metres) Re-Discovery of Famous O’Brien “Jewelry Box” Believed to have been the source of O’Brien’s famous museum quality VG specimens Mined between 25
Slide 20: July 28, 2025: Gold Mineralization in Trenching Program
TSXV : RDS OTCQX : RMRDF 20 July 28, 2025: Gold Mineralization in Trenching Program TX Z-Fold Quartz Vein First Trench of 2025 summer program S3p 30m east of O’Brien coreshack and office Semi- Massive Py- Po Band Visible gold in classic setting: 3m wide zone of high strain, biotite alteration, sulph
Slide 21: Next Steps
TSXV : RDS OTCQX : RMRDF 21 Next Steps Pursuing Exploration Growth Pursuing Development Path The PEA is a “Snap-Shot” of a The PEA offers a Credible and Practical Growing Project Development Path for O’Brien Significant Success with Ongoing Environmental Baseline Data leading Exploration to a future
Slide 22: Gold Price Assumptions and Sensitivities
TSXV : RDS OTCQX : RMRDF 22 WHY RADISSON Project Assumptions (2025 PEA) Gold Price Assumptions Assumption At US$4,000 Au and Sensitivities MRE US$2000/oz More Ounces, More Tonnes, Lower Grade DSO US$2000/oz More Tonnes, Larger Stopes, Better Continuity (Stope Design) NPV5% from C$532M to C$1.2B PEA1
Slide 23: Capitalization and Balance Sheet
TSXV : RDS OTCQX : RMRDF 23 Capitalization and Balance Sheet Shareholder Distribution Tickers TSXV:RDS | OTCQX:RMRDF 7% Management & Share Price 1 C$0.83 40% Insiders Public Float 1 Market Cap C$355 Million 26% 2 Institutional Common Shares 426 Million Shareholders 2 Options 17 Million 27% 2 Warrant
Slide 24: Contact Information
Contact Information Matt Manson President, CEO & Director mmanson@radissonmining.com Hubert Parent-Bouchard Chief Financial Officer hpbouchard@radissonmining.com Radisson Mining Resources Inc. 50 rue du Petit-Canada Kristina Pillon Rouyn-Noranda, Qc J0Y 1C0 Manager, Investor Relations Investor Inqui
Slide 25: Appendix
Appendix
Slide 26: O'Brien Gold Project
TSXV : RDS OTCQX : RMRDF 26 O’Brien Gold Project 26
Slide 27: Well Understood Geology
TSXV : RDS OTCQX : RMRDF 27 Well Understood Geology Good understanding of vein morphology and continuity from mapping of historic O’Brien workings At large-scale the veins are continuous, sub-parallel to the stratigraphy and are developed within multiple units of the Piche Group. Vein Model with 134
Slide 28: O'Brien Mineralogy
TSXV : RDS OTCQX : RMRDF 28 O’Brien Mineralogy Quartz-sulphide veins with coarse VG within Piché Formation adjacent to the Cadillac-Larder Lake Break High strain, with biotite alteration and pyrite/arsenopyrite association Pattern of very high-grade, narrow intercepts within broader altered and mine
Slide 29: O'Brien Mineral Resource Estimate
TSXV : RDS OTCQX : RMRDF 29 O’Brien Mineral Resource Estimate Indicated Mineral Resources Inferred Mineral Resources Basis of Estimate Tonnage (kt) Grade (g/t Au) Oz (koz Au) Tonnage (kt) Grade (g/t Au) Oz (koz Au) MRE 2023, 4.5 g/t Au Cutoff (US$1,600, 1.2m minimum width, 85% 1,517 10.3 501 1,601 8
Slide 30: Mineral Resource Estimate 2023
TSXV : RDS OTCQX : RMRDF 30 Mineral Resource Estimate 20231 Vertical Longitudinal Section looking North Blocks greater than 2023 MRE cut-off of 4.5 g/t Au are shown Drillhole traces used for 2023 MRE Notes 1. Evans, L., 2023, NI 43-101 Technical Report on the O’Brien Project, Northwestern Québec, Ca
Slide 31: Mineral Resource Estimate 2025
TSXV : RDS OTCQX : RMRDF 31 Mineral Resource Estimate 20251 Vertical Longitudinal Section looking North Blocks greater than 2025 MRE cut-off of 2.2 g/t Au Drillhole traces used for 2023 MRE and 2025 MRE are the same Lower cut-off adds tonnage between 2.2 g/t Au and 4.5 g/t Au for more ounces and imp
Slide 32: O'Brien 2025 PEA: At a Glance
TSXV : RDS OTCQX : RMRDF 32 O’Brien 2025 PEA: At a Glance General Inputs Westwood- LaRonde Doyon Discount Rate 5% Gold Price US$2,550/oz FX Rate 0.73 CAD:USD LOM Production Life of Mine 11.0 years Total Resource Milled 4.6 Mt Total Waste Mined 3.3 Mt Average Mill Feed Grade 5.0 g/t Gold Production (
Slide 33: O'Brien 2025 PEA: Underground Mine Design (2)
TSXV : RDS OTCQX : RMRDF 33 O’Brien 2025 PEA: Underground Mine Design (2) Twin portals and 4.5mx4.5m ramp access 20 tonne trucks and vertical conveyor from 300m level to surface 86km of development and 25m levels Does not utilize historic O’Brien Mine. Utilizes Kewagama Mine infrastructure for venti
Slide 34: O'Brien 2025 PEA: Underground Mine Design (3)
TSXV : RDS OTCQX : RMRDF 34 O’Brien 2025 PEA: Underground Mine Design (3) 56% of mined ounces in the PEA mine plan are from Indicated Mineral Resources and 44% from Inferred Mineral Resources Indicated/Inferred Mineral Resource blocks are equally distributed through the 11-year life Future infill dr
Slide 35: O'Brien 2025 PEA: Surface Facilities
TSXV : RDS OTCQX : RMRDF 35 O’Brien 2025 PEA: Surface Facilities No mill, tailings facility, or major surface earthworks No requirement for major access or power Water Treatment infrastructure No camp, surface maintenance (small vehicle Historic Mine Waste Rock maintenance at existing O’Brien facili
Slide 36: O'Brien 2025 PEA: Schedule, Permitting, EA
TSXV : RDS OTCQX : RMRDF 36 O’Brien 2025 PEA: Schedule, Permitting, EA O’Brien is subject to the Québec Environmental Quality Act and is expected to be subject to a Québec Environmental Impact Assessment and Review. The Project is not expected to be subject to a Federal Impact Assessment procedure b
Slide 37: O'Brien 2025 PEA: Costs
TSXV : RDS OTCQX : RMRDF 37 O’Brien 2025 PEA: Costs LOM Capital Costs (C$M)note 1,2 LOM Operating Costs and AISCnote 1,2 Mining Capex $93 $346 C$M Mining, Haulage and Water Management Mobile Equipment $25.7 $75.66 C$/tonne milled Mine Development $47.4 $173 C$M Buildings $0.4 Processing & Tailings $
Slide 38: O'Brien 2025 PEA: Sensitivities
TSXV : RDS OTCQX : RMRDF 38 O’Brien 2025 PEA: Sensitivities Valuation Sensitivities to Gold Price (C$M)note1,2 Gold Price (US$/oz) $1,800 $2,200 $2,550 $3,000 $3,300 $4000 1. 2. See "Non-IFRS Measures". Payback is defined as achieving cumulative Price Case Downside Consensus Upside “Spot” positive f
Slide 39: Neighbouring Mills to the O'Brien Project: Quebec
TSXV : RDS OTCQX : RMRDF 39 Neighbouring Mills to the O’Brien Project: Quebec Operating Process Facilities Sleeping Giant Mill 1. LaRonde Complex Exploration Projects Owner Abcourt Mines includes two mines Mine Feed Elder Mine (LaRonde Mine, LZ5 Mine) Throughput 350 tpd(3) which feed into two LaRond
Slide 40: Neighbouring Mills to the O'Brien Project: Ontario
TSXV : RDS OTCQX : RMRDF 40 Neighbouring Mills to the O’Brien Project: Ontario Operating Process Facilities Bell Creek Mill Normetal, Globex Mining Exploration Projects Owner Pan American Silver Mine Feed Bell Creek, Timmins West Throughput 4,400 tpd Capacity 5,359 tpd Dome Mill North Timmins, Gowes