Radisson files NI 43-101 tech report for O'Brien PEA

Mr. Matt Manson reports RADISSON FILES TECHNICAL REPORT FOR O'BRIEN GOLD PROJECT PRELIMINARY ECONOMIC ASSESSMENT Radisson Mining Resources Inc. has filed a technical report prepared in accordance with National Instrument 43-101 -- Standards of Disclosure for Mineral Projects for the O'Brien gold project located in the Abitibi region of Quebec. The report is titled "O'Brien Gold Project Technical Report and Preliminary Economic Assessment, Quebec, Canada." A copy of the technical report is available under the company's profile on SEDAR+. The O'Brien preliminary economic assessment (PEA) describes a high-value project based on the use of neighbouring milling facilities for the processing of mined material, reducing capital costs, development risk and project footprint (see Radisson news release dated July 9, 2025). It represents a snap-shot study for the project, utilizing the existing mineral resource estimate (MRE), reblocked with an updated cut-off yielding more ounces in more tonnes with good continuity at a lower average grade. A continuing 50,000- to 60,000-metre drill program at the project is currently delineating new gold mineralization outside the scope of the MRE and the initial mine design, including below the historic O'Brien mine workings. Highlights of the PEA include: After-tax net present value at a 5-per-cent discount rate (NPV 5 per cent) of $532-million, internal rate of return of 48 per cent and payback of 2.0 years at $2,550 (U.S.)/ounce gold (Au); Initial capital cost of $175-million and life-of-mine sustaining capital of $173-million; Cash cost of $861 (U.S.)/oz and all-in sustaining cost of $1,059 (U.S.)/oz including conceptual 30-per-cent toll milling margin on processing and G&A (general and administrative) costs; Extremely capital efficient with after-tax NPV 5 per cent to initial capital cost ratio of 3.0 at $2,550 (U.S.)/oz Au; 11-year mine life with 740,000 oz mined and 647,000 oz recovered at 87-per-cent average recovery with a gravity-flotation-regrind-leach flowsheet; 70,000 oz/annum average steady-state gold production (years 2 to 8) at an average annual after-tax free cash flow of $97-million. The PEA was completed by Ausenco Engineering Canada ULC as lead consultant with specific responsibility for metallurgy, processing design, infrastructure and financial modelling. InnovExplo (a member of Norda Stelo Inc.) completed the mine design and mine scheduling, BBA Inc. was responsible for water management, surface facilities, and a review of the project's environmental assessment procedure and permitting requirements, and SLR Consulting (Canada) Ltd. was responsible for the MRE. Qualified persons Disclosure of a scientific or technical nature in this news release was prepared under the supervision of Richard Nieminen, PGeo (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. The PEA is authored by Renee Barrette of Ausenco Engineering Canada ULC, the qualified person responsible for the preparation of the sections in the PEA on the project's milling assessment, metallurgy and the financial model which is based on capital costs, operating costs and the mining cost provided by other parties; Luke Evans, MSc, PEng, Ing, of SLR Consulting (Canada), the qualified person responsible for the preparation of the MRE at O'Brien; Marc R. Beauvais, PEng, of InnovExplo, a member of Norda Stelo Inc., the qualified person responsible for the sections in the PEA on the mine design and mine scheduling, and Hugo Latulippe of BBA Inc., the qualified person responsible for the sections on permitting, environmental, social, water management and closure cost estimate in the PEA. Each of Ms. Barrette, Mr. Evans, Mr. Beauvais and Mr. Latulippe have reviewed and approved the technical information contained in the PEA 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. About Radisson Mining Resources Inc. Radisson is a gold exploration company focused on its 100-per-cent-owned O'Brien gold project, located in the Bousquet-Cadillac mining camp along the world-renowned Larder-Lake-Cadillac Break in Abitibi, Que. 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 580,000 ounces (2.20 million tonnes at 8.2 grams per tonne Au), with additional inferred mineral resources estimated at 930,000 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" dated Aug. 20, 2025, and other filings made with Canadian securities regulatory authorities available at SEDAR+ for further details and assumptions relating to the O'Brien gold project. We seek Safe Harbor.