Fortuna Updates Company-Wide Mineral Reserves and Resources, Including Maiden Diamba Sud Estimate

FSM
November 01, 2025

Fortuna Mining Corp. released its updated Mineral Reserve and Mineral Resource estimates as of December 31, 2024, for its four operating mines and key projects. The Séguéla Mine successfully replenished mined reserves, with Mineral Reserve gold ounces remaining stable and gold grade increasing by 11 percent to 3.38 g/t Au, while Inferred Resources grew by 121 percent due to the Kingfisher deposit.

The Lindero Mine maintained its Mineral Reserves despite depletion, aided by a decrease in reporting cut-off grade due to higher gold prices, and its Arizaro Gold Project saw a 26 percent increase in Inferred Mineral Resources to 389,000 ounces of gold. The Caylloma Mine increased its Mineral Reserve tonnes by 7 percent, successfully replacing and adding to its reserves of silver, lead, and zinc.

A significant highlight is the first-time disclosure of Mineral Resources for the Diamba Sud Gold Project in Senegal, reporting an Indicated Resource of 7.8 million tonnes at 1.90 g/t Au containing 473,000 ounces of gold, and an Inferred Resource of 3.1 million tonnes at 1.47 g/t Au containing 148,000 ounces of gold. This new estimate is based on an extensive drill program and positions Diamba Sud as a future growth engine. The San Jose Mine was placed on care and maintenance on December 24, 2024, and the company is continuing its divestment process after terminating a prior agreement.

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