Fortuna Files Feasibility Study Technical Report for the Diamba Sud Gold Project, Senegal

Fortuna Mining (NYSE: FSM) has filed a National Instrument 43-101 compliant technical report titled “Diamba Sud Gold Project, Kédougou Region, Senegal,” with an effective date of June 30, 2026.

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Rhea-AI Summary

Fortuna Mining (NYSE: FSM) has filed a National Instrument 43-101 compliant technical report titled “Diamba Sud Gold Project, Kédougou Region, Senegal,” with an effective date of June 30, 2026. The report supports the Feasibility Study results announced on June 29, 2026, and is available on Fortuna’s website, SEDAR+, and EDGAR under the company’s profile.

Argus Jul 14 session 3 alerts

+1.67% close to close 0.1x rel. volume Open Argus

Details

News Market Reaction – FSM

$2.58B Mkt Cap at Peak Alert

On Jul 14, the first trading day after this news, FSM closed 1.67% above the previous close. Our momentum scanner recorded 3 alerts for this stock that day.

Data tracked by StockTitan Argus for the Jul 14 session.

Historical Context

5 past events · Latest: Jul 09

5 events

Jul 09
Production update

24h Move

+5.4%

Q2 2026 output of 72,217 GEO and advancement of key growth projects.
Jun 29
Feasibility study results

24h Move

+1.0%

Robust Diamba Sud feasibility study with strong NPV and IRR metrics.
Jun 25
AGM voting results

24h Move

+1.2%

2026 AGM with all resolutions passed and strong director support.
Jun 15
Environmental approval

24h Move

+5.8%

Key environmental decree for Diamba Sud ESIA from Senegalese authorities.
May 28
Sustainability report

24h Move

+3.0%

Release of 2025 Sustainability Report highlighting ESG progress and priorities.

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, sedar+, edgar

3 terms

national instrument 43-101 regulatory

"in accordance with National Instrument 43-101"

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.

sedar+ regulatory

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

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.

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07/13/2026 - 05:00 PM EDT

VANCOUVER, British Columbia, July 13, 2026 (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 a technical report entitled “Diamba Sud Gold Project, Kédougou Region, Senegal”, with an effective date of June 30, 2026 (the “Technical Report”), supporting the results of the Feasibility Study previously announced in Fortuna’s news release dated June 29, 2026.

The Technical Report is available on the Company’s website, and 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, Guinea, Guyana, 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:

PDF available: http://ml.globenewswire.com/Resource/Download/5a7d2432-f746-4c22-9f0c-08a77e62ebc1

FAQ

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

What did Fortuna Mining (FSM) file for the Diamba Sud Gold Project in July 2026?

Fortuna Mining filed a National Instrument 43-101 compliant technical report for the Diamba Sud Gold Project. According to Fortuna, the report supports the Feasibility Study results announced on June 29, 2026, and has an effective date of June 30, 2026.

When is the effective date of Fortuna Mining’s Diamba Sud Feasibility Study technical report (FSM)?

The effective date of Fortuna Mining’s Diamba Sud technical report is June 30, 2026. According to Fortuna, this NI 43-101 report supports the previously announced Feasibility Study results for the project in Senegal and is now publicly accessible to investors.

Where can investors access Fortuna Mining’s Diamba Sud technical report for FSM?

Investors can access Fortuna Mining’s Diamba Sud technical report on the company’s website. According to Fortuna, the report is also available on SEDAR+ and EDGAR under the company’s profile, providing multiple official channels for reviewing the Feasibility Study support.

How does the Diamba Sud technical report relate to Fortuna Mining’s June 29, 2026 Feasibility Study news?

The Diamba Sud technical report formally supports the Feasibility Study results announced on June 29, 2026. According to Fortuna, the NI 43-101 compliant document provides the technical backing required for that previously released Feasibility Study on the Senegal gold project.

Why is the NI 43-101 technical report for Diamba Sud important for Fortuna Mining (FSM) shareholders?

The NI 43-101 technical report provides formal technical support for Fortuna’s Diamba Sud Feasibility Study. According to Fortuna, filing this report fulfills regulatory disclosure standards, giving FSM shareholders structured documentation on the project’s study results through official platforms like SEDAR+ and EDGAR.

Fortuna Files Feasibility Study Technical Report for the Diamba Sud Gold Project, Senegal