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

Fortuna Mining Corp. has filed a National Instrument 43-101 technical report for its Diamba Sud Gold Project in Senegal, effective June 30, 2026. The filing serves as a regulatory compliance step to validate and support the Definitive Feasibility Study (DFS) results previously announced on June 29, 2026.

The report confirms the project's technical viability and keeps the path toward a Final Investment Decision (FID) and mid-2028 first gold on schedule. No new financial metrics, production updates, or operational changes are disclosed in this release. The report is now publicly available on SEDAR+, EDGAR, and the company website.

The filing carries no incremental market impact, as the DFS economics—NPV5% of $1.0 billion and an IRR of 60% at $3,500/oz—were already priced in when announced on June 29. Fortuna Mining Corp. (FVI) stock has declined approximately 35% from its February peak of $18.64 to current levels of roughly $12.03, suggesting the market is discounting execution risk, permitting delays, or macro headwinds rather than the project's technical merits. This step confirms the project is de-risked technically but does not alter the FID timeline, capital requirements, or near-term cash flow profile.

Fortuna Mining Corp. (FVI) is a producing gold and silver company with operating mines in Côte d'Ivoire (Séguéla), Argentina (Lindero), and Peru (Caylloma). The company’s growth pipeline includes Diamba Sud in Senegal, where a definitive feasibility study is complete and first gold is targeted for mid-2028, as well as a Séguéla expansion targeting more than 200,000 ounces per year post-expansion. Additionally, Fortuna Mining has made a strategic entry into the Guyana Shield via the Quartzstone earn-in agreement. The corporate strategy targets approximately 500,000 gold equivalent ounces of annual production by 2028 through organic growth and resource conversion.