Fortuna Mining Corp. (NYSE: FSM) (TSX: FVI) is pleased to provide an update on its exploration program at the Séguéla Mine in Côte d’Ivoire.

Paul Weedon, Senior Vice President, Exploration, commented, “The prospectivity of Kingfisher is underscored by the recent intersections of 15.3 meters averaging 4.1 g/t Au and 17 meters averaging 3.3 g/t Au; approximately 150 meters further along strike of the recently reported maiden Inferred Resource of 294,000 ounces averaging 2.3 g/t Au¹.” Mr. Weedon added, “At the Sunbird deposit, mineralization has been successfully drill defined approximately 650 meters further along strike from the limits of the existing underground resource and remains open.”

Drilling highlights include:

Kingfisher deposit

Sunbird deposit

Note:
1.   Refer to Fortuna news release dated December 10, 2024: “Fortuna updates Mineral Reserves and Mineral Resources for the Séguéla Mine, Côte d’Ivoire”

Kingfisher deposit

A further 58 holes totaling 11,103 meters were completed at the Kingfisher deposit since early September 2024 (refer to Figure 1), of which 16 holes totaling 3,286 meters were drilled subsequent to the maiden Inferred Resource data cut-off date (refer to Fortuna news release dated December 10, 2024). Kingfisher remains open at depth for most of the drilled 2-kilometer strike, with the deepest drilling only testing to approximately 250 meters below surface (refer to Figure 2).

Mineralization at Kingfisher demonstrates a clear association with the strongly deformed contact zone between a series of felsic intrusives, quartz veining, and host basaltic units. The change in strike orientation along the structure from north-south to north-east coincides with the higher grade, broader mineralization intervals. Mineralization is characterized by silica-biotite-sericite-carbonate alteration and pyrite development within and adjacent to the quartz veining.

Two drill rigs will continue working into the second quarter of 2025 to support resource infill drilling for resource conversion as well as drilling for depth and strike extensions.

Figure 1: Séguéla Mine deposit locations

Figure 2: Kingfisher deposit long-section – looking west

Sunbird deposit

At Sunbird, results from a further 24 holes, totaling 9,065 meters of a planned 12,000-meter drilling program have been received, with several high grades returned including 20.4 g/t Au over an estimated true width of 19.6 meters from 397 meters in drill hole SGRD2099 (refer to Figure 3).

The program is designed to infill and extend the current mineralized footprint as part of a program to evaluate underground mining potential, with mineralization remaining open more than 600 meters below surface, or more than 800 meters down plunge from the margin of the planned open pit. The most recent drill hole, which stepped out 150 meters to the south of the reported drilling and for which assays are pending, reported more than 15 points of visible gold (VG) associated with extensive alteration and quartz veining over an interval of 28 meters.

Drilling will continue into the first half of 2025 to support an updated resource model and underground mining studies.

Figure 3: Sunbird deposit long section – looking west

Refer to Appendix 1 for full details of the drill holes and assay results for this drill program at the Séguéla Mine.

Quality Assurance & Quality Control (QA – QC)

All drilling data completed by the Company utilized the following procedures and methodologies. All drilling was carried out under the supervision of the Company’s personnel.

All reverse circulation drilling used a 5.25-inch face sampling pneumatic hammer with samples collected into 60-liter plastic bags. Samples were kept dry by maintaining enough air pressure to exclude groundwater inflow. If water ingress exceeded the air pressure, RC drilling was stopped, and drilling converted to diamond core tails. Once collected, RC samples were riffle split through a three-tier splitter to yield a 12.5 percent representative sample for submission to the analytical laboratory. The residual 87.5 percent samples were stored at the drill site until assay results were received and validated. Coarse reject samples for all mineralized samples corresponding to significant intervals are retained and stored on-site at the Company-controlled core yard.

All diamond drilling drill holes started with HQ sized diameter, before reducing to NQ diameter diamond drill bits on intersecting fresh rock. The core was logged, marked up for sampling using standard lengths of one meter or to a geological boundary. Samples were then cut into equal halves using a diamond saw. One half of the core was left in the original core box and stored in a secure location at the Company core yard at the project site. The other half was sampled, catalogued, and placed into sealed bags and securely stored at the site until shipment.

All RC and DD samples were transported to ALS’s preparation laboratory in Yamoussoukro, Côte d’Ivoire, before also being transported via commercial courier, to ALS’s facility in Ouagadougou, Burkina Faso. Routine gold analysis using a 50-gram charge and fire assay with an atomic absorption finish was completed for all samples. Quality control procedures included the systematic insertion of blanks, duplicates and sample standards into the sample stream. In addition, the ALS laboratory inserted its own quality control samples.

Qualified Person

Paul Weedon, Senior Vice President, Exploration for Fortuna Mining Corp., is a Qualified Person as defined by National Instrument 43-101 being a member of the Australian Institute of Geoscientists (Membership #6001). Mr. Weedon has reviewed and approved the scientific and technical information contained in this news release. Mr. Weedon has verified the data disclosed, including the sampling, analytical and test data underlying the information or opinions contained herein by reviewing geochemical and geological databases and reviewing diamond drill core. There were no limitations to the verification process.

About Fortuna Mining Corp.

Fortuna Mining Corp. is a Canadian precious metals mining company with five operating mines in Argentina, Burkina Faso, Côte d’Ivoire, Mexico, and Peru, as well as the preliminary economic assessment stage Diamba Sud Gold Project located in Senegal. Sustainability is integral to all our operations and relationships. We produce gold and silver and generate shared value over the long-term for our stakeholders through efficient production, environmental protection, and social responsibility.