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

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.

News Market Reaction

+3.69%

1 alert

+3.69% News Effect

On the day this news was published, FSM gained 3.69%, reflecting a moderate positive market reaction.

Data tracked by StockTitan Argus on the day of publication.

Key Figures

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

2 metrics

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

Market Reality Check

Price: $10.37 Vol: Volume 10,976,378 is 1.58...

high vol

$10.37 Last Close

Volume Volume 10,976,378 is 1.58x the 20-day average of 6,967,440 ahead of this filing-focused news. high

Technical Price at $9.78 is trading above the 200-day MA of $7.09 and sits 5.78% below the 52-week high of $10.38.

Peers on Argus

Gold peers showed mixed moves: NovaGold +2.11%, SSR Mining +4.48%, Eldorado Gold...

Gold peers showed mixed moves: NovaGold +2.11%, SSR Mining +4.48%, Eldorado Gold +4.78%, while Sandstorm Gold -5.16% and B2Gold -0.64%. FSM’s modest +0.42% gain aligns more with company-specific technical disclosure than a broad sector trend.

Common Catalyst Eldorado Gold also reported updated reserves/resources, echoing FSM’s emphasis on formal technical and resource disclosure.

Historical Context

5 past events · Latest: Dec 08 (Positive)

Pattern 5 events

Date	Event	Sentiment	Move	Catalyst
Dec 08	Drill results update	Positive	-0.4%	New Diamba Sud drill intercepts and confirmation of PEA economics.
Dec 03	Expansion study	Positive	-1.9%	Award of Séguéla processing plant expansion options study.
Nov 26	Technical report filing	Positive	+3.7%	Filing NI 43-101 technical report for Diamba Sud PEA.
Nov 18	Reserve/resource update	Positive	+0.8%	Expanded Séguéla mineral reserves and resources disclosure.
Nov 05	Q3 earnings	Positive	+0.5%	Stronger Q3 cash generation and Diamba Sud PEA completion update.

Pattern Detected

Recent fundamentally positive updates (PEA, reserves/resources, drilling, Q3 results) usually saw modest positive price reactions, with occasional short-term divergences on growth news.

Recent Company History

Over the last months, Fortuna reported stronger Q3 2025 cash generation and liquidity on Nov 5, while advancing the Diamba Sud PEA with an outlined IRR and NPV5%. Subsequent updates expanded Séguéla reserves/resources on Nov 18 and launched a Séguéla plant expansion study on Dec 3. The Nov 26 NI 43-101 technical report formalized Diamba Sud PEA disclosure. Later drilling at Diamba Sud on Dec 8 further advanced the project, framing this report as part of a broader growth and de-risking sequence.

Market Pulse Summary

This announcement formalized the Diamba Sud project’s Preliminary Economic Assessment through an NI ...

Analysis

This announcement formalized the Diamba Sud project’s Preliminary Economic Assessment through an NI 43-101 technical report dated October 15, 2025, with full details filed on SEDAR+ and EDGAR. It follows earlier disclosures of PEA economics and ongoing drilling at Diamba Sud, plus reserve growth and expansion studies at Séguéla. Investors may focus on how future resource updates, definitive studies, and construction decisions track against the technical and economic assumptions documented in this report.

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. Not financial advice.

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

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.