Diamba Sud Continues To Yield Strong Results

VANCOUVER - Paul Weedon, Senior Vice President of Exploration of Fortuna Mining Corp. reported, “Our exploration work at Diamba Sud Gold Project in Senegal continues to yield strong results, particularly from areas with limited historical drilling. Notably, recent drilling at the Southern Arc prospect has delivered some of our most compelling intercepts to date - highlighted by 8.6 g/t gold over an estimated true width of 13.6 meters in hole DSR906, and 9.3 g/t gold over 11.8 meters in hole DSDD404. These results further reinforce the project’s potential for near-term resource growth.

Infill drilling at Area A, Area D, and Karakara has also returned highly encouraging results, including a standout intercept of 113.7 g/t gold over 6.4 meters estimated true width in hole DSDD385 at Area D. Meanwhile, regional target generation is progressing steadily, with systematic auger drilling identifying several promising gold-in-soil anomalies across the broader property.”

Exploration drilling at the Southern Arc prospect successfully intersected multiple zones of mineralization. The program, comprising 38 reverse circulation (RC) and diamond core drill holes for a total of 4,210 meters, was designed to test and refine the geological model - focusing on lithological and structural interactions and their controls on mineralization.

Mineralization at Southern Arc is hosted within an extensive hematite-altered tectonic breccia and occurs as stockworks or discrete veins - consistent with other prospects across the Diamba Sud Project. In addition, several nearby coincident geochemistry and geophysical anomalies further underscore the exploration potential of Southern Arc, including possible linkages to the adjacent Kassasoko deposit, located approximately one kilometre to the west.

An additional 33 drill holes for a total of 4,550 meters were completed at Area A, Area D, and Karakara, concluding a final round of infill drilling. This program was designed to achieve several key objectives: increasing resource confidence in targeted zones and confirming the geological controls on high-grade mineralization at depth.

Notably, several drill holes intersected mineralization adjacent to - but outside - the currently proposed open pit boundaries, indicating potential for further resource growth. For example, hole DSDD399 at Area A returned 3.0 g/t gold over an estimated true width of 28.8 meters from a depth of 153 meters, while hole DSDD385 at Area D intersected 2.6 g/t gold over 40 meters estimated true width.

These encouraging results will be incorporated into the forthcoming resource update for the Diamba Sud Project and underscore the potential for future resource expansion, particularly in Area A.

Exploration drilling at the pre-resource stage Moungoundi prospect and its northern extension, Moungoundi North - located approximately 300 meters to the northeast - was successfully completed, with a total of 85 RC and diamond core drill holes drilled for 9,472 meters.

The program significantly improved the understanding of this geologically and structurally complex area, characterized by intercalated tectonic breccias, carbonate metasediments, and granitic and dioritic intrusive units. Mineralization is typically associated with various vein arrays, preferentially hosted within the tectonic breccias.

Results from this program will be incorporated into the next resource update for the Diamba Sud Project, contributing valuable insight into the broader mineral system.