Fortuna Mining Corp. (NYSE: FSM) (TSX: FVI) is pleased to report results from ongoing exploration drilling at the Sunbird deposit, located at the Séguéla Mine in Côte d’Ivoire (see Figure 1). Recent drilling has successfully extended mineralization at depth and expanded a second high grade mineralized shoot.

Paul Weedon, Senior Vice President of Exploration, commented, “Continued drilling at Sunbird confirms that high grade mineralization remains wide open at depth.” Mr. Weedon added, “With five drill rigs currently focused on Sunbird, these results build on previously announced high grade drill intercepts and further underpin the potential for resource growth.”

Sunbird Deposit Drilling Highlights

A further 22 drill holes, totaling 9,816 meters, have been completed at the Sunbird deposit as part of the underground resource confidence infill and extension drilling program (see Figure 2). All drill holes were completed after the June 30, 2025 data cut-off date used for reporting the current Séguéla Mineral Resources and Mineral Reserves (refer to Fortuna news release dated January 20, 2026). Drilling focused on extending the lower shoot and has successfully delineated high grade gold mineralization approximately 400 meters beyond the existing Mineral Resource and Mineral Reserves envelopes, with results including 13.0 g/t Au over an estimated true width of 4.2 meters from 686 meters depth in drill hole SGDD149. Infill drilling has also targeted the linkage between the upper and lower shoots, returning results such as 4.1g/t Au over an estimated true width of 11.9 meters from 499 meters depth in SGRD2487.

Mineralization at the Sunbird deposit remains open at depth and along strike, with drilling expected to continue throughout 2026.

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

Figure 1: Location of the Sunbird Deposit, Séguéla Mine, Côte d’Ivoire

Figure 2: Sunbird Deposit long-section – looking west, Séguéla Mine, Côte d’Ivoire

Quality Assurance & Quality Control

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 by Company vehicle or commercial courier to either the ALS Global preparation laboratory in Yamoussoukro, Cote d’Ivoire or the Bureau Veritas preparation and analytical laboratory in Abidjan, Cote d’Ivoire. Sample pulps prepared by ALS Global were then 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 at either ALS’s Ouagadougou laboratory or Bureau Veritas’ laboratory in Abidjan. Samples returning assays >10 ppm Au were reanalyzed using a 50-gram charge and fire assay with a gravimetric finish. Quality control procedures included the systematic insertion of blanks, duplicates and sample standards into the sample stream. In addition, both ALS and Bureau Veritas laboratories inserted their 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 three operating mines and a portfolio of exploration projects in Argentina, Côte d’Ivoire, Mexico, and Peru, as well as the Diamba Sud Gold Project in Senegal. Sustainability is at the core of our operations and stakeholder relationships. We produce gold and silver while creating long-term shared value through efficient production, environmental stewardship, and social responsibility.