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Radisson Files Technical Report for O'Brien Gold Project Preliminary Economic Assessment

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Radisson Mining Resources (OTCQB: RMRDF) has filed a technical report for its O'Brien Gold Project in Quebec, detailing results of a Preliminary Economic Assessment (PEA). The PEA reveals strong economic potential with an after-tax NPV5% of $532 million and an IRR of 48% at US$2,550/oz gold.

The project features an 11-year mine life with expected production of 740,000 ounces of gold at an average recovery rate of 87%. Initial capital costs are estimated at $175 million, with all-in sustaining costs of US$1,059/oz. The project expects average steady-state gold production of 70,000 ounces annually during years 2-8, generating average annual after-tax free cash flow of $97 million.

Radisson Mining Resources (OTCQB: RMRDF) ha depositato un rapporto tecnico sul progetto aurifero O'Brien in Québec, che presenta i risultati di una Preliminary Economic Assessment (PEA). La valutazione evidenzia un solido potenziale economico con un NPV dopo imposte scontato al 5% pari a $532 milioni e un IRR del 48% basati su un prezzo dell'oro di US$2.550/oz.

Il progetto prevede una vita della miniera di 11 anni, con una produzione prevista di 740.000 once d'oro e un tasso di recupero medio dell'87%. I costi di capitale iniziali sono stimati in $175 milioni, mentre i costi complessivi di mantenimento si attestano a US$1.059/oz. Durante gli anni 2-8 si prevede una produzione annua media in regime di 70.000 once, generando un flusso di cassa libero medio annuo dopo imposte di $97 milioni.

Radisson Mining Resources (OTCQB: RMRDF) ha presentado un informe técnico sobre su proyecto aurífero O'Brien en Quebec, que detalla los resultados de una Evaluación Económica Preliminar (PEA). La PEA muestra un fuerte potencial económico con un VAN después de impuestos al 5% de $532 millones y una TIR del 48% asumiendo un precio del oro de US$2.550/oz.

El proyecto contempla una vida útil de la mina de 11 años, con una producción estimada de 740.000 onzas de oro y una tasa de recuperación media del 87%. El gasto de capital inicial se estima en $175 millones, y los costos sostenidos totales son de US$1.059/oz. Se espera una producción anual media en régimen de 70.000 onzas durante los años 2-8, generando un flujo de caja libre promedio anual después de impuestos de $97 millones.

Radisson Mining Resources (OTCQB: RMRDF)� 퀘벡 소재 O'Brien � 프로젝트� 대� 기술 보고서를 제출했으�, 여기에는 예비 경제� 평가(PEA) 결과가 상세� 담겨 있습니다. PEA� � 가격을 온스� US$2,550� 가정했� � 세후 NPV(할인� 5%)가 5�3,200� 달러� 달하� 내부수익�(IRR)은 48%� 강한 경제성을 보여줍니�.

� 프로젝트� 채광 수명 11�� 특징으로 하며, 평균 회수� 87%� 74� 온스� � 생산� 예상됩니�. 초기 자본비는 1�7,500� 달러� 추산되며, � 지속비�(All-in sustaining cost)은 US$1,059/oz입니�. 2~8년차 동안 연간 안정� 생산량은 평균 70,000 온스�, 연평� 세후 잉여현금흐름은 $97 million으로 예상됩니�.

Radisson Mining Resources (OTCQB: RMRDF) a déposé un rapport technique pour son projet aurifère O'Brien au Québec, présentant les résultats d'une Preliminary Economic Assessment (PEA). La PEA révèle un fort potentiel économique avec un VAN après impôts actualisé à 5% de 532 M$ et un TRI de 48% en supposant un prix de l'or de US$2 550/oz.

Le projet prévoit une durée de vie de la mine de 11 ans, avec une production attendue de 740 000 onces d'or et un taux de récupération moyen de 87%. Les coûts d'investissement initiaux sont estimés à 175 M$, et les coûts totaux soutenus (all-in sustaining costs) s'élèvent à US$1 059/oz. La production annuelle moyenne à régime, prévue pour les années 2 à 8, est de 70 000 onces, générant un flux de trésorerie disponible moyen après impôts de 97 M$ par an.

Radisson Mining Resources (OTCQB: RMRDF) hat einen technischen Bericht für sein O'Brien-Goldprojekt in Québec eingereicht, der die Ergebnisse einer Preliminary Economic Assessment (PEA) darlegt. Die PEA zeigt ein starkes wirtschaftliches Potenzial mit einem Nachsteuer-NPV (abgezinst 5%) von $532 Mio. und einer IRR von 48% bei einem Goldpreis von US$2.550/oz.

Das Projekt sieht eine Bergbau-Lebensdauer von 11 Jahren vor und erwartet eine Produktion von 740.000 Unzen Gold bei einer durchschnittlichen Rückgewinnungsrate von 87%. Die anfänglichen Investitionskosten werden auf $175 Mio. geschätzt, die All-in-sustaining-Kosten liegen bei US$1.059/oz. In den Jahren 2�8 wird eine durchschnittliche Jahresproduktion im Betrieb von 70.000 Unzen erwartet, die einen durchschnittlichen jährlichen Nachsteuer-Free-Cashflow von $97 Mio. generiert.

Positive
  • Strong economics with after-tax NPV5% of $532 million and 48% IRR
  • Attractive 2-year payback period at US$2,550/oz gold
  • Competitive AISC of US$1,059/oz including toll milling costs
  • High capital efficiency with NPV5% to Initial Capital ratio of 3.0
  • Robust steady-state production of 70,000 oz/year with $97M annual free cash flow
  • Ongoing 50-60,000 metre drill program could expand resource beyond current estimates
Negative
  • Significant initial capital requirement of $175 million
  • Project relies on third-party toll milling facilities
  • Additional sustaining capital of $173 million required over mine life

Rouyn-Noranda, Quebec--(Newsfile Corp. - August 21, 2025) - Radisson Mining Resources Inc. (TSXV: RDS) (OTCQB: RMRDF) ("Radisson" or the "Company") is pleased to announce that it 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 ("O'Brien" or the "Project") located in the Abitibi region of Québec. The report is titled "O'Brien Gold Project Technical Report and Preliminary Economic Assessment, Québec, Canada." A copy of the technical report is available under the Company's profile on .

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 ). It represents a "snap-shot" study for the Project, utilizing the existing Mineral Resource Estimate ("MRE"), re-blocked with an updated cut-off yielding more ounces in more tonnes with good continuity at a lower average grade. An ongoing 50-60,000 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% discount rate ("NPV5%") of $532 million, Internal Rate of Return of 48%, and payback of 2.0 years at US$2,550/oz gold ("Au").
  • Initial Capital Cost of $175 million and Life-of-Mine Sustaining Capital of $173 million.
  • Cash Cost1 of US$861/oz and All-In Sustaining Cost1 of US$1,059/oz including conceptual 30% toll milling margin on processing and G&A costs.
  • Extremely capital efficient with after-tax NPV5% to Initial Capital Cost ratio of 3.0 at US$2,550/oz Au.
  • 11-Year Mine Life with 740 koz mined and 647 koz recovered at 87% average recovery with a gravity-flotation-regrind-leach flowsheet.
  • 70 koz/annum average steady-state gold production (Years 2-8) at an average annual after-tax Free Cash Flow1 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. were responsible for water management, surface facilities, and a review of the Project's environmental assessment procedure and permitting requirements, and SLR Consulting (Canada) Ltd. were responsible for the MRE.

Qualified Persons

Disclosure of a scientific or technical nature in this news release 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.

The PEA is authored by Renée 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; Mr. Luke Evans, M.Sc., P.Eng., ing, of SLR Consulting (Canada) Ltd., the Qualified Person responsible for the preparation of the MRE at O'Brien; Mr. Marc R. Beauvais, P.Eng. 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; Mr. 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.

Non-IFRS Financial Measures

The Company has included various references in this document 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 news release and common to the gold mining industry are defined below.

Total Cash Cost and Total Cash Cost per Ounce

Total Cash Cost is reflective of the cost of production. Total Cash Cost reported in the PEA include mining costs, processing & water treatment costs, general and administrative costs of the mine, off-site costs, refining costs, transportation costs and royalties. Total Cash Cost per Ounce is calculated as Total Cash Cost divided by payable gold ounces.

All-in Sustaining Cost (AISC) and AISC per Ounce

AISC is reflective of all of the expenditures that are required to produce an ounce of gold from operations. AISC reported in the PEA includes total cash costs, sustaining capital, expansion capital and closure costs, but excludes corporate general and administrative costs and salvage. AISC per Ounce is calculated as AISC divided by payable gold ounces.

Free Cash Flow (FCF)

FCF deducts capital expenditures from net cash provided by operating activities. Management believes this to be a useful indicator of our ability to operate without reliance on additional borrowing or usage of existing cash. Free cash flow is intended to provide additional information only and does not have any standardized definition under IFRS and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS. The measure is not necessarily indicative of operating profit or cash flow from operations as determined under IFRS. Other companies may calculate this measure differently.

About Ausenco

Ausenco is a global company redefining what's possible. The team is based out of 21 offices working across five continents to deliver services worldwide. Combining deep technical expertise with a 30-year track record, Ausenco delivers innovative, value-add consulting, studies, project delivery, asset operations and maintenance solutions to the minerals and metals and industrial sectors ().

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, Québec. 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, Québec, Canada" dated August 20, 2025, and other filings made with Canadian securities regulatory authorities available at for further details and assumptions relating to the O'Brien Gold Project.

For more information on Radisson, visit our website at or contact:

Matt Manson
President and CEO
416.618.5885
[email protected]

Kristina Pillon
Manager, Investor Relations
604.908.1695
[email protected]

Forward-Looking Statements

This news release contains "forward-looking information" within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections, and interpretations as at the date of this news release. Forward-looking statements including, but are not limited to, statements with respect to the ability to execute the Company's plans relating to the O'Brien Gold Project as set out in the PEA; the Company's ability to complete its planned exploration and development programs; the absence of adverse conditions at the O'Brien Gold Project; the absence of unforeseen operational delays; the absence of material delays in obtaining necessary permits; the price of gold remaining at levels that render the O'Brien Gold Project profitable; the Company's ability to continue raising necessary capital to finance its operations; the ability to realize on the mineral resource and mineral reserve estimates; assumptions regarding present and future business strategies, local and global geopolitical and economic conditions and the environment in which the Company operates and will operate in the future;, planned and ongoing drilling, the significance of drill results, the ability to continue drilling, the impact of drilling on the definition of any resource, and the ability to incorporate new drilling in an updated technical report and resource modelling; the Company's ability to grow the O'Brien Gold Project; the ability to negotiate and execute an arrangement with IAMGOLD related to the Doyon Mill on satisfactory terms or at all; and the ability to convert inferred mineral resources to indicated mineral resources.

Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as "expects", or "does not expect", "is expected", "interpreted", "management's view", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates", "believes" or "intends" or variations of such words and phrases or stating that certain actions, events or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. Except for statements of historical fact relating to the Company, certain information contained herein constitutes forward-looking statements. Forward-looking information is based on estimates of management of the Company, at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the companies to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others; the risk that the O'Brien Gold Project will never reach the production stage (including due to a lack of financing); the Company's capital requirements and access to funding; changes in legislation, regulations and accounting standards to which the Company is subject, including environmental, health and safety standards, and the impact of such legislation, regulations and standards on the Company's activities; price volatility and availability of commodities; instability in the global financial system; the effects of high inflation, such as higher commodity prices; the risk of any future litigation against the Company; changes in project parameters and/or economic assessments as plans continue to be refined; the risk that actual costs may exceed estimated costs; geological, mining and exploration technical problems; failure of plant, equipment or processes to operate as anticipated; accidents, labour disputes and other risks of the mining industry; delays in obtaining governmental approvals or financing; risks relating to the drill results at O'Brien; the significance of drill results; and the ability of drill results to accurately predict mineralization. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, the parties cannot assure shareholders and prospective purchasers of securities that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither the Company nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. The Company believes that this forward-looking information is based on reasonable assumptions, but no assurance can be given that these expectations will prove to be correct and such forward-looking statements included in this press release should not be unduly relied upon. The Company does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law. These statements speak only as of the date of this news release.

Please refer to the "Risks and Uncertainties Related to Exploration" and the "Risks Related to Financing and Development" sections of the Company's Management's Discussion and Analysis dated April 29, 2025 for the years ended December 31, 2024, and the Company's Management's Discussion and Analysis dated May 28, 2025 for the three-months ended March 31, 2025, all of which are available electronically on SEDAR+ at . All forward-looking statements contained in this press release are expressly qualified by this cautionary statement.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release. No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein.


1 Denotes a "specified financial measure" within the meaning of National Instrument 52-112 Non-GAAP and Other Financial Measures Disclosure of the Canadian Securities Administrators ("NI 52-112"). See note on "Non-IFRS Financial Measures".

To view the source version of this press release, please visit

FAQ

What is the expected mine life and production capacity of Radisson's O'Brien Gold Project?

The O'Brien Gold Project has an 11-year mine life with total production of 740,000 ounces of gold, averaging 70,000 ounces annually during steady-state production years 2-8.

What are the economic highlights of RMRDF's O'Brien Gold Project PEA?

The PEA shows an after-tax NPV5% of $532 million, 48% IRR, and 2-year payback period at US$2,550/oz gold, with an AISC of US$1,059/oz.

How much capital investment does Radisson need for the O'Brien Gold Project?

The project requires an initial capital investment of $175 million plus life-of-mine sustaining capital of $173 million.

What is the expected annual free cash flow from RMRDF's O'Brien Gold Project?

During steady-state production years 2-8, the project is expected to generate average annual after-tax free cash flow of $97 million.

What is the gold recovery rate expected at Radisson's O'Brien Project?

The project expects an average gold recovery rate of 87% using a gravity-flotation-regrind-leach flowsheet.
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