Globenewswire·2025-12-08 10:00Core Viewpoint - Fortuna Mining Corp. reports positive exploration drilling results from the Southern Arc deposit at the Diamba Sud Gold Project in Senegal, indicating strong potential for resource growth and robust project economics with an estimated after-tax NPV5% of US$563 million and an IRR of 72% at a gold price of US$2,750 per ounce [1][2]. Exploration Results - The company has completed an additional 63 reverse-circulation and diamond drill holes totaling 9,619 meters at Southern Arc, with ongoing drilling using five rigs [3][6]. - Significant drill results include: - DSDD555: 6.8 g/t gold over an estimated true width of 35.5 meters [2][3]. - DSDD574: 1.7 g/t gold over an estimated true width of 29.6 meters and 2.0 g/t over an estimated true width of 20.0 meters [5][6]. - DSDD558: 8.8 g/t gold over an estimated true width of 14.4 meters [4][5]. - DSDD563: 5.8 g/t gold over an estimated true width of 20.8 meters [4][5]. Project Development - The Diamba Sud project is currently at the PEA stage and is advancing towards a feasibility study, with a construction decision targeted for the second quarter of 2026 [1][2]. - An updated resource estimate is expected in the first quarter of 2026, incorporating the latest drilling results [2][3]. Geological Context - Mineralization at Southern Arc is characterized by fine stockwork vein arrays and pyrite-silica flooding, with strong correlation to tectonic breccia and carbonate units [7][8]. - The mineralization remains open to the south, east, and at depth, with drilling only testing to approximately 150 meters below the surface [8].