06:08 AM EDT, 04/23/2026 (MT Newswires) -- Fortuna Mining (FSM) Thursday reported a 15% year-over-year rise in proven and probable mineral reserves to 3.0 million gold-equivalent ounces, or GEOs, driven by converting resources into reserves, particularly at the Seguela mine in Cote d'Ivoire.

The increase includes 819,000 GEOs converted from resources, partly offset by depletion of 378,000 GEOs. Measured and indicated resources rose 56% to 2.1 million GEOs, led by drilling at the Diamba Sud project in Senegal, while inferred resources edged up 4% to 2.2 million GEOs.

At Seguela's Sunbird deposit, underground reserves jumped 34% to 539,000 ounces, with inferred resources up 55% following recent drilling, it said.

A feasibility study at Diamba Sud is on track, with initial reserve estimates expected by quarter-end to support a construction decision, the company added.