Fortuna Files PEA Technical Report Highlighting the Development Potential of the Diamba Sud Gold Project, Senegal

Fortuna Mining (NYSE: FSM) filed a National Instrument 43-101 technical report titled “Diamba Sud Gold Project, Kédougou Region, Senegal” with an effective date of October 15, 2025.

Rhea-AI Summary

Fortuna Mining (NYSE: FSM) filed a National Instrument 43-101 technical report titled “Diamba Sud Gold Project, Kédougou Region, Senegal” with an effective date of October 15, 2025. The report supports the Preliminary Economic Assessment previously announced on October 15, 2025 and is available on the company website, SEDAR+, and EDGAR.

This filing formalizes disclosure under Canadian standards and makes the PEA technical details available to investors and regulators.

Argus Nov 28 session

+3.69% close to close Open Argus

Details

News Market Reaction – FSM

On Nov 28, the first trading day after this news, FSM closed 3.69% above the previous close.

Data tracked by StockTitan Argus for the Nov 28 session.

Key Figures

Technical report effective date: October 15, 2025 PEA announcement date: October 15, 2025

Technical report effective date

October 15, 2025

Effective date of Diamba Sud NI 43-101 Technical Report

PEA announcement date

October 15, 2025

Date of prior news release with Diamba Sud PEA results

Historical Context

5 past events · Latest: Dec 08

5 events

1. Dec 08

   Drill results update

   24h Move

   -0.4%

   New Diamba Sud drill intercepts and confirmation of PEA economics.

2. Dec 03

   Expansion study

   24h Move

   -1.9%

   Award of Séguéla processing plant expansion options study.

3. Nov 26

   Technical report filing

   24h Move

   +3.7%

   Filing NI 43-101 technical report for Diamba Sud PEA.

4. Nov 18

   Reserve/resource update

   24h Move

   +0.8%

   Expanded Séguéla mineral reserves and resources disclosure.

5. Nov 05

   Q3 earnings

   24h Move

   +0.5%

   Stronger Q3 cash generation and Diamba Sud PEA completion update.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

national instrument 43-101, preliminary economic assessment, sedar+, edgar

4 terms

national instrument 43-101 regulatory

"in accordance with National Instrument 43-101 - Standards of Disclosure"

National Instrument 43-101 is a set of rules and guidelines that govern how mineral exploration and mining companies must report information about their projects. It ensures that the details shared with investors are accurate, consistent, and reliable—similar to how a detailed, verified blueprint ensures a building’s safety. This helps investors make informed decisions based on trustworthy information about a company's mineral resources.

preliminary economic assessment technical

"supporting the results of the Preliminary Economic Assessment (PEA) previously announced"

A preliminary economic assessment is an initial analysis that estimates the potential profitability and feasibility of a project or resource, such as a new mineral deposit or development venture. It provides a rough idea of costs, benefits, and risks, helping investors decide whether to pursue more detailed studies. This early evaluation is important because it offers a snapshot of whether the project is worth further investment and development.

sedar+ regulatory

"The Technical Report is available on the Company’s website, on SEDAR+ and on EDGAR"

SEDAR+ is Canada’s centralized online system where publicly traded companies submit required regulatory documents such as financial reports, prospectuses and disclosure statements. It gives investors a single, searchable place — like a public library or online filing cabinet — to check a company’s official records for transparency, compare performance, and verify material information before making investment decisions.

edgar regulatory

"available on the Company’s website, on SEDAR+ and on EDGAR under the Company’s profile"

EDGAR is a system used by companies to share important financial and business information with the public. It functions like an online filing cabinet where investors can access official reports and documents that help them understand a company's financial health and operations. This transparency allows investors to make more informed decisions, much like checking a company's report card before investing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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VANCOUVER, British Columbia, Nov. 26, 2025 (GLOBE NEWSWIRE) -- Fortuna Mining Corp. (NYSE: FSM | TSX: FVI) is pleased to announce that, in accordance with National Instrument 43-101 -  Standards of Disclosure for Mineral Projects, it has filed the technical report entitled “Diamba Sud Gold Project, Kédougou Region, Senegal”, with an effective date of October 15, 2025  (the “Technical Report”), supporting the results of the Preliminary Economic Assessment (PEA) previously announced in Fortuna’s news release dated October 15, 2025.

The Technical Report is available on the Company’s website, on SEDAR+ and on EDGAR under the Company’s profile.  

About Fortuna Mining Corp.

Fortuna Mining Corp. is a Canadian precious metals mining company with three operating mines and a portfolio of exploration projects in Argentina, Côte d'Ivoire, Mexico, and Peru, as well as the Diamba Sud Gold Project in Senegal. Sustainability is at the core of our operations and stakeholder relationships. We produce gold and silver while creating long-term shared value through efficient production, environmental stewardship, and social responsibility. For more information, please visit our website at www.fortunamining.com

ON BEHALF OF THE BOARD

Jorge A. Ganoza
President, CEO, and Director
Fortuna Mining Corp.

Investor Relations:

Carlos Baca | info@fmcmail.com | fortunamining.com | X | LinkedIn | YouTube

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Fortuna Mining (FSM) file on November 27, 2025 regarding Diamba Sud?

Fortuna filed a NI 43-101 technical report titled “Diamba Sud Gold Project, Kédougou Region, Senegal” with an effective date of October 15, 2025.

Where can investors access the Diamba Sud technical report for FSM?

The report is available on Fortuna’s website, on SEDAR+, and on EDGAR under the company profile.

Does the filed technical report for Diamba Sud relate to a Preliminary Economic Assessment for FSM?

Yes. The technical report supports the PEA previously announced on October 15, 2025.

What is the effective date of the Diamba Sud technical report filed by FSM?

The technical report has an effective date of October 15, 2025.

Which regulatory standard did Fortuna follow when filing the Diamba Sud technical report?

Fortuna filed the report in accordance with National Instrument 43-101 disclosure standards.