Fortuna’s Diamba Sud gold ESIA approval: design and schedule notes for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Fortuna Mining has secured Senegalese government approval of the environmental and social impact assessment for its Diamba Sud gold project in eastern Senegal, clearing a key hurdle ahead of a mining permit decision following its 4 Feb 2026 application. A 2025 preliminary economic assessment reported an after-tax IRR of 72% and a US$563 million NPV (5% discount rate) at US$2,750/oz gold, with a 2026 project budget of US$100 million and final investment and construction decision targeted by mid‑2026. For engineers, the ESIA decree signals regulatory alignment for detailed design, site preparation and construction planning.
Technical Brief
- ESIA approval was granted by formal governmental decree, confirming regulatory compliance of Diamba Sud’s design.
- The decree followed submission of the mining permit application on 4 February 2026 to the energy, petroleum and mines ministry.
- Corporate statements frame the approval as aligned with Senegal’s policy to “enable responsible development” of its mining sector.
- Project economics were derived from a 2025 preliminary economic assessment, not yet a full feasibility-level study.
- Fortuna’s wider portfolio includes exploration assets in Argentina, Côte d’Ivoire, Guinea, Guyana and Peru, spreading country risk.
Our Take
The 72% after-tax IRR and US$563 million NPV at 5% put Diamba Sud at the upper end of West African gold project economics in our database, which likely gives Fortuna Mining more flexibility on financing terms for the planned US$100 million 2026 project spend.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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