Fortuna Files Environmental and Social Impact Assessment for the Diamba Sud Gold Project in Senegal and provides update on Preliminary Economic Assessment status

VANCOUVER, British Columbia, Oct. 07, 2025 (GLOBE NEWSWIRE) -- Fortuna Mining Corp. (NYSE: FSM | TSX: FVI) reports that it has filed an Environmental and Social Impact Assessment (ESIA) for the Diamba Sud Gold Project with the Direction de la Réglementation Environnementale et du Contrôle (DiREC), which is part of the Ministry of the Environment and Sustainable Development of Senegal. The filing of the ESIA marks an important milestone in the permitting process and reinforces the Company´s commitment to advancing Diamba Sud to a construction decision in the first half of 2026. Fortuna also provides an update on the status of the project’s Preliminary Economic Assessment (PEA) and ongoing drilling activities.

Jorge A. Ganoza, President and CEO, commented, “The filing of the ESIA represents a key step forward in advancing Diamba Sud towards development. The document contains Fortuna’s commitment to high environmental and social standards and to working in partnership with government, host communities, and various stakeholders in Senegal.” Mr. Ganoza continued, “We plan to complete the project’s preliminary economic assessment during the fourth quarter and move to a definitive feasibility study and construction decision during the first half of 2026.”

Highlights

• Submission of ESIA to the Senegalese authorities in accordance with national legislation and alignment with international standards
• ESIA covers the project description and benefits for the country, the institutional and regulatory framework, environmental and social baseline studies, the public consultation, impact assessment and proposed mitigation and monitoring plans and programs
• PEA study advancing on schedule, with completion planned during the fourth quarter of 2025
• 52,110 meters drilled year-to-date in 2025 leading to a mineral resource expansion for the project of 53 percent in Measured and Indicated and 93 percent in Inferred categories for the project (refer Fortuna news release dated August 5, 2025)
• Drilling is planned to restart during October after the end of the rainy season and will continue until year-end with the aim of testing extensions of open mineralization