Resource Estimate
Fortuna Advances Diamba Sud Gold Project in Senegal with Updated Mineral Resources; PEA Completion Targeted for Q4 2025

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Executive Summary
- Fortuna Mining released an updated NI 43‑101 compliant mineral resource estimate for its Diamba Sud Gold Project in Senegal, showing a 53% increase in indicated resources to 724,000 oz Au and a 93% increase in inferred resources to 285,000 oz Au.
- The update incorporates results from 243 new drill holes (31,652 m) completed July 2024‑July 2025 and adds first‑time inferred resources for the Southern Arc (194,000 oz) and Moungoundi (31,000 oz) deposits.
- A Preliminary Economic Analysis is in progress with results expected in Q4 2025; exploration drilling will continue to infill and expand the resource base.
Key Details
- Indicated Resources: 14.2 Mt at 1.59 g/t Au = 724,000 oz Au (Area A, D, Karakara, Western Splay, Kassassoko).
- Inferred Resources: 6.2 Mt at 1.44 g/t Au = 285,000 oz Au (including new Southern Arc and Moungoundi estimates).
- Resource Growth vs. FY‑2024: +53% indicated, +93% inferred.
- Drilling Program: 243 holes, 31,652 m added; total historic drilling now 1,178 holes, 154,814 m since 2019.
- Assumptions Used: Long‑term gold price $2,600/oz; pit‑shell optimization and cut‑off grades ranging from 0.31–0.42 g/t Au depending on deposit metallurgy.
- Exploration Focus (Southern Arc): Ongoing infill drilling to upgrade inferred resources and expansion drilling where mineralization remains open at shallow depths south/east of current limits.
- Technical Oversight: Qualified Person – Eric Chapman, P.Geo., Senior VP Technical Services, reviewed and approved all scientific/technical information.
- Forward‑Looking Statements: Preliminary Economic Analysis targeted for Q4 2025; further drilling planned for Q4 2025 to expand the resource pipeline.
Notable Quotes
“The substantial increase in both indicated and inferred resources underscores the strength of our exploration model at Diamba Sud and positions the project for a robust economic evaluation later this year,” – Jorge A. Ganoza, President & CEO.
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Jul 29, 2026 · 20:56