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O’Brien Gold Project

Advancing Québec’s
Next High-Grade Gold Mine

The O’Brien Gold Project is Radisson’s 100%-owned, high-grade gold project located in the heart of Québec’s Cadillac–Bousquet mining district in the Abitibi region – one of Canada’s most prolific gold belts.

Historically, the O’Brien mine produced 587,000 ounces at an average grade of 15.25 g/t Gold (1926–1957). Today, Radisson is advancing a modern, low-capex, small footprint mine development path built around offsite milling and established infrastructure.

Unlocking the Full Potential of O’Brien

A high-grade, low-capex gold project offering robust returns and scalable growth supported by established infrastructure.

Established Location

Located in Québec’s Abitibi region – one of the world’s most prolific and mining-friendly gold belts – offering access to skilled labour, power, roads, and processing infrastructure within a robust mining ecosystem.

High Grade Foundation

Hosts a high-grade resource effective January 31 2026, including 0.63 Moz indicated (3.49 Mt at 5.59 g/t Au) and 1.69 Moz inferred (10.37 Mt at 5.08 g/t Au)*. Supported by strong metallurgy and consistent resource growth, the O’Brien project ranks as one of Québec’s most compelling development stories.

Robust Economics

The 2025 Preliminary Economic Assessment* outlines an after-tax NPV (5%) of C$532 million, an IRR of 48%, and a 2.0-year payback, highlighting a project with strong returns and low capital intensity.

Active Drill Program

Through 2026, a fully funded 140,000m drill program is actively targeting high-grade extensions up to 2km depth, expanding mineralization and validating the scale potential of O’Brien.

 

Low Impact Development

O’Brien benefits from exceptional existing infrastructure, including power, transportation and multiple nearby mills, enabling a development strategy based on offsite processing with a low estimated capital cost of C$175M* and a low-impact mine site.

Growing Project

Since the current 140,000-metre program began in 2024, step-out drilling has repeatedly intersected gold well below the old mine workings and former mineral resources, with an impressive success rate for intersecting resource quality mineralization. A January 2026 mineral resource update showed a growth trajectory on track for an Exploration Target of 0.6 to 2.0 million ounces should mineralization continue to 2km depth.

*For more information, please refer to the news release dated March 2, 2026

In the Heart of Québec's Established Abitibi Gold Belt

  • Established Mining Region: Located in Québec’s Abitibi, one of the world’s most prolific gold belts with more than 100 Moz of historic gold production.
  • Strategically Located: Sits within the 25-Moz Cadillac–Bousquet Camp along the Cadillac–Larder Lake Break, host to some of Canada’s highest-grade gold mines.
  • Hub-and-Spoke Mining Complex: Surrounded by world-class operators including Agnico Eagle, IAMGOLD, Wesdome, and Eldorado Gold
  • Infrastructure Advantage: Access to Highway 117, grid power, rail, and supported by the region’s experienced mining labour force

Strategic, Accessible, and Infrastructure-Rich

The O’Brien property covers approximately 5.2 km of strike along the Cadillac–Larder Lake Break, one of the most productive gold-bearing structures in North America. The project is easily accessed via Highway 117, with grid power, rail, and skilled labour within immediate proximity.

A Historic Producer, Poised for a Modern Revival

Between 1926 and 1957, the O’Brien Mine produced over 587,000 oz of gold at an average grade of 15.25 g/t , establishing it as one of the highest-grade producers in the Abitibi. Today, Radisson is advancing the next chapter, expanding resources below and beyond the historic workings.

O’Brien PEA Webinar Playback

July 9, 2025

High-Grade Resource
with Significant Expansion Potential

The 2025 Mineral Resource Estimate, prepared by SLR Consulting, outlines a high-grade foundation with strong continuity and growth potential.

*For more information, please refer to the news release dated March 2, 2026

Robust Economics and Capital Efficiency

The 2025 PEA demonstrates a low-capex, high-return project
leveraging existing regional infrastructure and off-site milling.

Click here to view notes to the Preliminary Economic Assessment

Looking for more information?

Get the latest overview of Radisson’s strategy, financial position, and project milestones – including details from the 2025 PEA and ongoing exploration results.

Corporate Presentation
VRIFY Presentation

National Instrument 43-101 Disclosure

National Instrument 43-101 – Standards of Disclosure for Mineral Projects is a rule developed by the Canadian Securities Administrators, and applicable throughout Canada, which establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects materials to the issuer. Radisson mining Resources Inc. adheres to the NI 43-101 standards, and provides the following information related to its mineral projects and Qualified Person:

Qualified Persons
Disclosure of a scientific or technical nature in this website 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. Nieminen is independent of Radisson and the O’Brien Gold Project.

Renée Barrette of Ausenco Engineering Canada ULC, is the Qualified Person responsible for the preparation of the Project’s milling assessment, PEA metallurgy, and for PEA financial model which is based on capital costs, operating costs, and the mining cost provided by other parties. 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. Mr. Marc R. Beauvais, P.Eng. of Innov-Explo, a member of Norda Stelo, is the Qualified Person responsible for the mine design and mine scheduling. Mr. Hugo Latulippe of BBA is the Qualified Person responsible for the permitting, environmental, social, water management and closure cost estimate.

Each of Mr. Nieminen, Ms. Barrette, Mr. Evans, Mr. Beauvais and Mr. Latulippe have reviewed and approved the technical information contained in the PEA and in this press release in their area of expertise and are considered to be “independent” of Radisson and the O’Brien Gold Project for purposes of NI 43-101.

 

Project Filings

O’Brien Gold Project NI 43-101 Technical Report & Preliminary Economic Assessment

Effective June 27, 2025

Explore Radisson Mining

The Radisson Team

Meet the experienced leadership and technical team driving O’Brien Project’s next phase of development.

Meet the Team

Investors

Access presentations, reports, and key filings to stay informed on Radisson’s progress and performance.

Why Invest

News

View Radisson Mining’s latest news releases and corporate updates.

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Notes to the Preliminary Economic Assessment at the O’Brien Gold Project

Comparison to Previous Mineral Resource Estimate, a mineral resource estimate was completed for the O’Brien Gold Project by SLR (2023).The principal reason for the changes to the O’Brien mineral resource estimate is the decrease in the reporting cut-off grade from 4.5 to 2.2 g/t Au (SLR) reflecting a change in the long-term gold price from US$1,600/oz Au to US$2,000/oz Au, increased milling recovery to 90% based on testwork as reported in Section 13, and engineering studies confirming the reasonableness of blocks meeting a marginal grade cut-off.
 
Historical Reports:
27 REFERENCES Agnico Eagle, 2023, https://www.agnicoeagle.com/English/operations/operations/LaRonde/default.aspx, Accessed April 11, 2023.
 
Ayer, J., Amelin, Y., Corfu, F., Kamo, S., Ketchum, J.F., Kwok, K., and Trowell, N.F., 2002a, Evolution of the Abitibi greenstone belt based on U-Pb geochronology: Autochthonous volcanic construction followed by plutonism, regional deformation and sedimentation: Precambrian Research, v. 115, p. 63–95.
 
Beaudoin, G., Mercier-Langevin, P., Dubé, B., Taylor, B. E., 2014, Low-Temperature Alteration at the World-Class LaRonde Penna Archean Au-Rich Volcanogetic Massive Sulfide Deposit, Abitibi Subprovince, Québec, Canada: Evidence from Whole-Rock Oxygen Isotopes, Economic Geology, v. 109, pp. 167-182.
 
Beausoleil, C., 2018, NI 43-101 Technical Report and Mineral Resource Estimate for the O’Brien Gold Project, Abitibi, Québec, prepared for Radisson Mining Resources Inc. by InnovExplo, May 3, 208.
 
Benn, K., and Peschler, A.P., 2005, A detachment fold model for fault zones in the Late Archean Abitibi greenstone belt: Tectonophysics, v. 400, p. 85–104
 
Benn, K., Miles, W., Ghassemi, M. R., Gillet, J., 1994. Crustal structure and kinematic framework of the north-western Pontiac Subprovince, Québec: an integrated structural and geophysical study. Canadian Journal; of Earth Sciences, Vol. 31, pages 271-281.
 
Bisson, Y., 1995, 1994-1995 Winter Drilling Campaign Report. O’Brien Property Zone 36 East. Internal Report of Radisson Mining Resources Inc. 45 pages.
 
Bisson, Y., 1996. Rapport de campagne 1995-1996, Propriété O’Brien, Canton Cadillac. Ressources Minières Radisson Inc. Internal Report. 36 pages.
 
Blais, R.A., 1954, A Petrologic and Decrepitometric Study of the Gold Mineralization at the O’Brien Mine, Northwestern Québec, University of Toronto Ph.D. Thesis.
 
Canadian Institute of Mining, Metallurgy and Petroleum (CIM), 2014, CIM Definition Standards for Mineral Resources and Mineral Reserves, adopted by the CIM Council on May 10, 2014.
 
Centre Technologique ddCIM, 2019, CIM Estimation of Mineral Resources & Mineral Reserves Best Practice Guidelines, adopted by the CIM Council on November 29, 2019.
 
CIM, 2019, CIM Estimation of Mineral Resources & Mineral Reserves Best Practice Guidelines, adopted by the CIM Council on November 29, 2019. O’Brien Gold Project Page 252 NI 43-101 Technical Report & Preliminary Economic Assessment August 20, 2025
 
Daigneault, R., Mueller, W.U., Chown, E.H., 2004. Abitibi greenstone belt plate tectonics: the diachronous history of arc development, accretion and collision. In Eriksson, P.G., Altermann, W., Nelson, D.R., Mueller, W.U., Catuneanu, O. (Eds.). The Precambrian Earth: Tempos and Events, Series: Developments in Precambrian geology, vol. 12, Elsevier, pages. 88–103.
 
De l’Etoile, R. and Salmon, B., 2013, Technical Report on the O’Brien Gold Project Mineral resource Estimate, Québec, Canada, Prepared for Radisson Mining Resources Inc., October 21, 2013.
 
Dimroth, E, Imrech, L., Rocheleau, M., Goulet, N., 1983. Evolution of the south-central part o f the Archean Abitibi Belt, Québec. Part III: plutonic and metamorphic evolution and geotectonic model. Canadian Journal of Earth Sciences, Vol. 20, pages 1374-1388.
 
Dubé, B. and Gosselin, P. 2007, Greenstone-Hosted Quartz-Carbonate Vein Deposits. In Goodfellow, W. D., ed. Mineral Deposits of Canada: A Synthesis of Major Deposit-Types, District Metallogeny, the Evolution of Geological Provinces, and Exploration Methods. Geological Association of Canada, Mineral Deposits Division, Special Publication No. 5. p. 49-73.
 
Dubé, B., O’Brien, S., and Dunning, G. R., 2001. Gold deposits in deformed terranes: examples of epithermal and quartz-carbonate shear-zone-related gold systems in the Newfoundland Appalachians and their implications for exploration. In North Atlantic Symposium, St-John’s, NF, Canada. Extended abstracts volume, May 27-30, 2001. p. 31-35.
 
Dubé, B., Poulsen K.H., and Guha, J., 1989. The effects of layer anisotropy on auriferous shear zones: The Norbeau mine, Québec: Economic Geology, v. 84, p. 871-878.
 
Dundee Sustainable Technologies (DST), “Gold Concentration, Extraction and Arsenic Removal on Material from the O’Brien Deposit”, August 9, 2017.
 
Evans, L. and Karpoff, B., 1998, Resource Estimate of the O’Brien Mine Zone 36 East, Québec, prepared for Radisson Mining Resources Inc. by Roscoe Postle Associates Inc., June 5, 1998, Two Volumes.
 
Evans, L., 2007, Technical Report on the O’Brien Mine Zone 36 East Mineral Resource Estimate, Cadillac, Québec, Canada, prepared for Radisson Mining Resources Inc. by Scott Wilson Roscoe Postle Associates Inc., May 9, 2007.
 
Globex, 2024, Globex Again Intersects High-Grade Gold at Ironwood, News Release dated December 18, 2024.
 
Goutier, J., 1997, Géologie de la région de Destor: Ministère des Ressources naturelles du Québec 37 pages. RG 96- 13.
 
Goutier, J., and Melançon, M., 2007, Compilation géologique de la Sous-province de l’Abitibi (version préliminaire): Ministère des Ressources naturelles et de la Faune du Québec. O’Brien Gold Project Page 253 NI 43-101 Technical Report & Preliminary Economic Assessment August 20, 2025
 
Groves, D.I., Goldfarb, R.J., Know-Robinson, C.M., Ojala, J., Gardoll, S., Yun, G., and Holyland, P., 2000, Late-kinematic timing of orogenic gold deposits and significance for computer-based exploration techniques with emphasis on the Yilgarn block, Western Australia: ore Geology Reviews, v. 17, p. 1-38.
 
Hagemann, S.G., and Cassidy, K.F., 2000, Archean orogenic lode gold deposits, in Hagemann, S.G., and Brown, P.E., eds., Gold in 2000: Society of Economic Geologists, Reviews in Economic Geology, v. 13, p. 9-68.
 
Hatch, 1998, O’Brien Metallurgical Testwork Review, Internal Company Report by Kevin Fraser and Holger Krutzelmann of Hatch Associates for Radisson Mining Resources Inc.
 
Hodgson, C.J., 1989, The structure of shear-related, vein-type gold deposits: A review: ore Geology Reviews, v. 4, p. 635-678.
 
Jolly, W. T., 1978. Metamorphic history of the Archean Abitibi Belt. In Metamorphism in the Canadian Shield. Geological Survey of Canada, Paper 78-10, pp. 63-78.
 
Kerrich, R., and Cassidy, K.F., 1994. Temporal relationships of lode gold mineralization to accretion, magmatism, metamorphism and deformation – Archean to present: A review: ore Geology Reviews, v. 9, p. 263-310.
 
Lafrance, B, Mercier-Langevin, P. Dubé. B., Galley, A.G., Hannington, M.D., Davis, D.W., Moorhead, J., Pilote, P., Mueller, W.U., 2003. Carte synthèse de la FormationnMERQ-OGS, 1984, Lithostratigraphic map of the Abitibi subprovince: Ontario Geological Survey and Ministère de l’Énergie et des Ressources, Québec, Map 2484 and DV 83–16.
 
Mills, J.W., 1950, Structural Control of Orebodies as Illustrated by the Use of Vein Contours at the O’Brien Gold Mine, Cadillac, Québec, Econ. Geol., Vol. 45, pp. 786-807.
 
Poulsen, K. H., Robert, F., and Dubé, B., 2000. Geological classification of Canadian cold deposits. Geological Survey of Canada, Bulletin 540, 106 pages.
 
Pressacco, R., 2008, Technical Report for the Mineral Resource Estimate, Ironwood Project, Cadillac Township, Québec, (NTS 32D/01), Globex Mining Enterprises Inc and Queenston Mining Inc., 93 p.
 
Radisson Mining Resources Inc. & IAMGOLD Corporation (2024). Memorandum of Understanding Between Radisson Mining Resources Inc. and IAMGOLD Corporation.” September 6, 2024.
 
Richard, P., Turcotte, B., Carrier, A., 2015, Technical Report for the O’Brien Gold Project, Abitibi, Quebec, prepared by InnovExplo for Radisson Mining Resources Inc., June 3, 2015.
 
Robert, F., and Poulsen, K.H., 2001. Vein formation and deformation in greenstone gold deposits, in Richards, J.P., and Tosdal, R.M., eds., Structural Controls on ore Genesis: Society of Economic Geologists, Reviews in Economic Geology, v. 14, p. 111-155. O’Brien Gold Project Page 254 NI 43-101 Technical Report & Preliminary Economic Assessment August 20, 2025
 
Robert, F., Poulsen, K.H., and Dubé, B., 1994, Structural analysis of lode gold deposits in deformed terranes and its application: Geological Survey of Canada, Short course notes, Open File Report 2850, 140p.
 
SGS Mineral Services, 2019, The determination of the gold head grade and recovery from the O’Brien Gold Project (Project 16914-01 – Final Report), March 18, 2019.
 
SLR , 2023, Technical Report on the O’Brien Project, Northwestern Québec, Canada, with an effective date of March 2, 2023, 125 p.
 
SLR 2025, NI 43-101 Technical Report Ironwood Gold Deposit, Cadillac, Québec, Canada for Globex Mining Enterprises Inc.
 
Thurston, P.C., Ayer, J.A., Goutier, J., and Hamilton, M.A., 2008, Depositional gaps in the Abitibi greenstone belt stratigraphy: A key to exploration for syngenetic mineralization. Economic Geology, v. 103, p. 1097−1134
 
Trudel, P., Sauvé, P., Tourigny, G., Hubert, C., and Roy, L., 1992. Synthèse des caractéristiques géologiques des gisements d’or de la région de Cadillac (Abitibi). Ministère des Ressources naturelles du Québec.106 pages. MM 91-01.
 
Williamson, K., 2019, NI 43-101 Technical Report and Mineral Resource Estimate for the O’Brien Gold Project, Abitibi, Québec, prepared for Radisson Mining Resources Inc. by Kenneth Williamson 3D Geo-Solution, August 29, 2019.
 
Non-IFRS Financial Measures
The Company has included various references that constitute “specified financial measures” within the meaning of National Instrument 52-112 Non-GAAP and Other Financial Measures Disclosure of the Canadian Securities Administrators, such as, for example, Free Cash Flow, EBITDA, Total Cash Cost and All-In Sustaining Cost. None of these specified measures is a standardized financial measure under International Financial Reporting Standards (“IFRS”) and these measures might not be comparable to similar financial measures disclosed by other issuers. Each of these measures are intended to provide additional information to the reader and should not be considered in isolation or as a substitute for measures prepared in accordance with IFRS. Certain non-IFRS financial measures used in this website and common to the gold mining industry are defined below.