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Fortuna drills 22.7 g/t gold over 21.6 meters at Southern Arc, Diamba Sud Gold Project, Senegal

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Fortuna Mining Corp. (NYSE: FSM) has reported significant exploration drilling results from its Diamba Sud Gold Project in Senegal. The highlight includes drillhole DSDD488, which yielded an exceptional intercept of 22.7 g/t gold over 21.6 meters from a depth of 53 meters.

The company completed 152 drill holes totaling 21,234 meters since the previous update. Of these, 53 holes were completed after the data cutoff for Southern Arc's maiden Inferred Mineral Resource estimate of 3.9 Mt averaging 1.57 g/t Au containing 194 koz of gold. The deposit remains open to the south, east, and at depth, with current drilling extending to approximately 150 meters.

Drilling has been temporarily paused for the rainy season and is scheduled to resume in mid-September, with an updated resource estimate planned for Q1 2026.

Fortuna Mining Corp. (NYSE: FSM) ha comunicato risultati significativi dalle perforazioni esplorative presso il Diamba Sud Gold Project in Senegal. In evidenza il foro DSDD488, che ha restituito un intercetto eccezionale di 22,7 g/t di oro su 21,6 metri a partire da 53 metri di profondità.

La società ha completato 152 fori per un totale di 21.234 metri dall'ultimo aggiornamento. Di questi, 53 fori sono stati effettuati dopo la chiusura dei dati utilizzata per la stima iniziale di risorsa minerale inferita di Southern Arc di 3,9 Mt con una media di 1,57 g/t Au per un contenuto di 194 koz d'oro. Il deposito rimane aperto a sud, a est e in profondità; le perforazioni attuali raggiungono circa 150 metri.

Le perforazioni sono temporaneamente sospese per la stagione delle piogge e sono previste riprese a metà settembre, con una stima delle risorse aggiornata pianificata per il primo trimestre 2026.

Fortuna Mining Corp. (NYSE: FSM) ha informado de resultados de perforación exploratoria significativos en su Diamba Sud Gold Project en Senegal. Cabe destacar el sondeo DSDD488, que presentó un intercepto excepcional de 22,7 g/t de oro sobre 21,6 metros desde una profundidad de 53 metros.

La compañía completó 152 perforaciones para un total de 21.234 metros desde la actualización anterior. De éstas, 53 perforaciones se realizaron después del corte de datos para la estimación inicial de recurso mineral inferido de Southern Arc de 3,9 Mt con un promedio de 1,57 g/t Au que contiene 194 koz de oro. El depósito permanece abierto al sur, al este y en profundidad; la perforación actual alcanza aproximadamente 150 metros.

Las perforaciones están temporalmente suspendidas por la temporada de lluvias y están programadas para reanudarse a mediados de septiembre, con una estimación de recursos actualizada prevista para el 1T de 2026.

Fortuna Mining Corp. (NYSE: FSM)세네갈 Diamba Sud 금 프로젝트에서 실시된 탐사 시추 결과를 발표했습니다. 특히 시추공 DSDD488에서 깊이 53m 지점부터 21.6m 구간에서 22.7 g/t 금이라는 탁월한 간격이 확인되었습니다.

회사는 이전 업데이트 이후 총 152개 시추공, 합계 21,234미터를 완료했습니다. 이 중 53개는 Southern Arc의 첫 번째 추정된 추정광물자원(Inferred Mineral Resource) 데이터 컷오프 이후에 완료되었습니다. 해당 추정치는 3.9 Mt, 평균 1.57 g/t Au, 금 194 koz 포함입니다. 광상은 남쪽·동쪽·심부 방향으로 아직 열려 있으며, 현재 시추는 약 150미터까지 확장되었습니다.

우기(우계)로 인해 시추는 일시 중단된 상태이며 9월 중순에 재개될 예정이고, 자원 추정치 업데이트는 2026년 1분기에 계획되어 있습니다.

Fortuna Mining Corp. (NYSE: FSM) a annoncé des résultats de forage d'exploration significatifs pour son Diamba Sud Gold Project au Sénégal. À noter le forage DSDD488, qui a délivré un intercept exceptionnel de 22,7 g/t d'or sur 21,6 mètres à partir d'une profondeur de 53 mètres.

La société a achevé 152 forages pour un total de 21 234 mètres depuis la dernière mise à jour. Parmi eux, 53 forages ont été réalisés après la date de coupure des données utilisée pour l'estimation initiale de ressource minérale inférée de Southern Arc, soit 3,9 Mt avec une moyenne de 1,57 g/t Au et contenant 194 koz d'or. Le gisement reste ouvert au sud, à l'est et en profondeur ; les forages en cours atteignent environ 150 mètres.

Les forages sont temporairement interrompus pour la saison des pluies et devraient reprendre à la mi-septembre, une estimation de ressources mise à jour étant prévue pour le T1 2026.

Fortuna Mining Corp. (NYSE: FSM) hat bedeutende Untersuchungsergebnisse aus Explorationsbohrungen auf seinem Diamba Sud Gold Project in Senegal gemeldet. Hervorzuheben ist Bohrloch DSDD488, das einen außergewöhnlichen Abschnitt von 22,7 g/t Gold über 21,6 Meter ab einer Tiefe von 53 Metern lieferte.

Das Unternehmen hat seit dem letzten Update 152 Bohrlöcher mit insgesamt 21.234 Metern abgeschlossen. Davon wurden 53 Löcher nach dem Datenstichtag für die erste Inferred-Mineralressourcenschätzung von Southern Arc abgeschlossen, die 3,9 Mt mit einem Durchschnitt von 1,57 g/t Au und einem Gehalt von 194 koz Gold ausweist. Das Lagerstättenareal bleibt nach Süden, Osten und in die Tiefe offen; die aktuellen Bohrungen reichen auf etwa 150 Meter Tiefe.

Die Bohrarbeiten sind aufgrund der Regenzeit vorübergehend ausgesetzt und sollen Mitte September wiederaufgenommen werden. Eine aktualisierte Ressourcen-Schätzung ist für Q1 2026 geplant.

Positive
  • High-grade gold intercepts including exceptional 22.7 g/t Au over 21.6 meters
  • Deposit remains open in multiple directions indicating potential for resource expansion
  • Maiden resource estimate established with 194,000 ounces of gold
  • Additional 53 holes completed after resource estimate cutoff to be included in Q1 2026 update
Negative
  • Drilling operations temporarily paused due to rainy season
  • Current drilling depth limited to only 150 meters

Insights

Fortuna reports exceptional high-grade gold intercepts at Diamba Sud, indicating significant resource expansion potential beyond recent estimate.

The exploration results from Fortuna's Southern Arc deposit represent exceptional high-grade gold intercepts that substantially exceed typical economic gold grades. The standout intersection of 22.7 g/t gold over 21.6 meters (true width) is particularly significant - most operating gold mines consider anything above 5 g/t to be high-grade material. These results also include bonanza-grade zones like 258.8 g/t gold over 1.6 meters within the broader intercept.

What makes these results especially valuable is their shallow depth, with most intercepts occurring within 150 meters of surface. This suggests potential for low strip ratio open-pit mining which significantly reduces extraction costs. The consistent nature of high-grade results across multiple drill holes (DSDD418, DSDD440, DSDD444, DSDD462, DSDD484, DSDD487, DSDD488) indicates this isn't an isolated occurrence but potentially a cohesive high-grade zone.

Notably, 53 of the 152 new drill holes were completed after the data cutoff for the maiden resource estimate of 194,000 ounces at 1.57% gold. With mineralization remaining open in multiple directions (south, east, and at depth), and drilling only extending to approximately 150 meters, there's substantial potential for resource expansion in the upcoming Q1 2026 update. The current pause due to the rainy season provides a natural inflection point before drilling resumes in September.

The mineral system characteristics - stockwork vein arrays, pyrite-silica flooding, and hematite alteration similar to other deposits at Diamba Sud - suggest a robust gold system with potential for continuity beyond current drilling limits.

VANCOUVER, British Columbia, Aug. 13, 2025 (GLOBE NEWSWIRE) -- Fortuna Mining Corp. (NYSE: FSM | TSX: FVI) is pleased to report additional exploration drilling results from the Southern Arc deposit at the Diamba Sud Gold Project located in Senegal, following the July 7, 2025 resource update (see Fortuna news release dated August 5, 2025).

Paul Weedon, Senior Vice President of Exploration at Fortuna, commented, “Exploration drilling at the Southern Arc deposit has continued beyond the data cut-off date for its maiden resource estimate, returning several high-grade intercepts. Highlights include drillhole DSDD488, which intersected 22.7 g/t Au over an estimated true width of 21.6 meters from a downhole depth of 53 meters.”

Mr. Weedon continued, “These results further demonstrate the potential for resource growth at Diamba Sud. The deposit remains open to the south, east, and at depth, with current drilling only extending to approximately 150 meters. Drilling is scheduled to resume in September, following the end of the rainy season, with further results expected by year-end.”

Southern Arc Deposit Drilling highlights include

DSDD418:6.3 g/t Au
23.3 g/t Au
14.2 g/t Au
17.9 g/t Au
over an estimated true width of 18.2 meters from 31 meters, including
over an estimated true width of 0.8 meters from 40 meters, and
over an estimated true width of 0.8 meters from 42 meters, and
over an estimated true width of 1.6 meters from 45 meters
DSDD440:6.3 g/t Au
10.3 g/t Au
10.6 g/t Au
10.4 g/t Au
19.4 g/t Au
3.7 g/t Au
13.6 g/t Au
over an estimated true width of 16.8 meters from 30 meters,including
over an estimated true width of 1.1 meters from 30.7 meters, and
over an estimated true width of 2.4 meters from 34 meters, and
over an estimated true width of 0.8 meters from 41 meters, and
over an estimated true width of 0.8 meters from 43 meters
over an estimated true width of 11.0 meters from 54.2 meters, including
over an estimated true width of 0.8 meters from 54.1 meters
DSDD444:4.5 g/t Au
14.0 g/t Au
33.5 g/t Au
13.0 g/t Au
13.1 g/t Au
over an estimated true width of 32.0 meters from 30 meters, including
over an estimated true width of 1.6 meters from 40 meters, and
over an estimated true width of 0.8 meters from 45 meters, and
over an estimated true width of 1.6 meters from 48 meters, and
over an estimated true width of 0.8 meters from 58 meters
DSDD4621:9.7 g/t Au
21.9 g/t Au
18.4 g/t Au
13.4 g/t Au
14.2 g/t Au
16.8 g/t Au
over an estimated true width of 20.8 meters from 117 meters, including
over an estimated true width of 2.2 meters from 120.3 meters, and
over an estimated true width of 2.4 meters from 124 meters, and
over an estimated true width of 0.8 meters from 129 meters, and
over an estimated true width of 0.8 meters from 133 meters, and
over an estimated true width of 1.6 meters from 140 meters
   


DSDD4841:4.2 g/t Au
13.3 g/t Au
14.6 g/t Au
18.4 g/t Au
13.2 g/t Au
over an estimated true width of 31.2 meters from 5 meters, including
over an estimated true width of 0.8 meters from 7 meters, and
over an estimated true width of 1.6 meters from 15 meters, and
over an estimated true width of 0.8 meters from 19 meters, and
over an estimated true width of 1.6 meters from 32 meters
DSDD4871:7.8 g/t Au
33.6 g/t Au
20.5 g/t Au
11.1 g/t Au
13.2 g/t Au
over an estimated true width of 22.4 meters from 31 meters, including
over an estimated true width of 1.6 meters from 44 meters, and
over an estimated true width of 0.8 meters from 51 meters, and
over an estimated true width of 1.6 meters from 53 meters, and
over an estimated true width of 0.8 meters from 56 meters
DSDD4881:22.7 g/t Au
258.8 g/t Au
over an estimated true width of 21.6 meters from 53 meters, including
over an estimated true width of 1.6 meters from 66 meters
DSR933:6.7 g/t Au
21.6 g/t Au
36.1 g/t Au
over an estimated true width of 4.0 meters from surface, and
over an estimated true width of 6.4 meters from 65 meters, including
over an estimated true width of 2.4 meters from 67 meters
DSR9761:4.9 g/t Au
19.4 g/t Au
over an estimated true width of 23.2 meters from 51 meters, including
over an estimated true width of 3.2 meters from 63 meters
   

Note:

1. Not included in the resource estimate; see Fortuna news release dated August 5, 2025

Exploration drilling at Southern Arc has been a key focus for the Diamba Sud project with a further 152 reverse circulation (“RC”) and diamond core drill holes for a total of 21,234 meters completed since the previous exploration update (see Fortuna news release dated May 27, 2025). The program at Southern Arc has been paused for the rainy season with drilling expected to resume in mid-September.

Of the 152 drill holes, 53 were completed after the data cutoff for Southern Arc’s maiden Inferred Mineral Resource estimate of 3.9 Mt averaging 1.57 g/t Au and containing 194 koz of gold (see Fortuna news release dated August 5, 2025) and will, along with additional drilling planned for the fourth quarter of 2025, be included in an updated resource estimate planned for the first quarter of 2026. Details of the completed holes are presented in Appendix 1.

Mineralization at Southern Arc occurs as variable fine stockwork vein arrays to diffuse pyrite-silica flooding and has a strong correlation with certain of the tectonic breccias and carbonate units (refer to Figures 1 to 3) and commonly demonstrates an extensive hematite alteration association, similar to the other prospects and deposits at Diamba Sud.

Mineralization remains open at depth and along strike to the south and east.

Figure 1: Southern Arc Section 600NE

Southern Arc Section 600NE

Figure 2: Southern Arc Section 650NE

Southern Arc Section 650NE

Figure 3: Southern Arc Section 700NE

Southern Arc Section 700NE

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

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 RC 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 (DD) 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 ALS Global’s preparation laboratories in Kedougou, Senegal or Bamako, Mali, with prepared sample pulps then transported via commercial courier to ALS Global’s analytical 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. 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, the ALS Global 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 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. For more information, please visit our website at www.fortunamining.com

ON BEHALF OF THE BOARD

Jorge A. Ganoza
President, CEO, and Director
Fortuna Mining Corp.

Investor Relations:
Carlos Baca | info@fmcmail.com | fortunamining.com | X | LinkedIn | YouTube

Forward looking Statements

This news release contains forward-looking statements which constitute “forward-looking information” within the meaning of applicable Canadian securities legislation and “forward-looking statements” within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995 (collectively, “Forward-looking Statements”). All statements included herein, other than statements of historical fact, are Forward-looking Statements and are subject to a variety of known and unknown risks and uncertainties which could cause actual events or results to differ materially from those reflected in the Forward-looking Statements. The Forward-looking Statements in this news release may include, without limitation, the Mineral Resource estimates at Diamba Sud; the Company’s proposed exploration plans at Diamba Sud; statements pertaining to the potential for resource growth at Diamba Sud statements about the Company’s business strategies, plans and outlook; the Company’s plans for its mines and mineral properties; changes in general economic conditions and financial markets; the impact of inflationary pressures on the Company’s business and operations; the future results of exploration activities; expectations with respect to metal grade estimates and the impact of any variations relative to metals grades experienced; assumed and future metal prices; the merit of the Company’s mines and mineral properties; and the future financial or operating performance of the Company. Often, but not always, these Forward-looking Statements can be identified by the use of words such as “estimated”, “potential”, “open”, “future”, “assumed”, “projected”, “proposed”, “used”, “detailed”, “has been”, “gain”, “planned”, “reflecting”, “will”, “anticipated”, “estimated” “containing”, “remaining”, “to be”, or statements that events, “could” or “should” occur or be achieved and similar expressions, including negative variations.

Forward-looking Statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance, or achievements of the Company to be materially different from any results, performance or achievements expressed or implied by the Forward-looking Statements. Such uncertainties and factors include, among others, operational risks associated with mining and mineral processing; uncertainty relating to Mineral Resource and Mineral Reserve estimates; uncertainty relating to capital and operating costs, production schedules and economic returns; risks relating to the Company’s ability to replace its Mineral Reserves; risks related to the conversion of Mineral Resources to Mineral Reserves; risks associated with mineral exploration and project development; uncertainty relating to the repatriation of funds as a result of currency controls; environmental matters including obtaining or renewing environmental permits and potential liability claims; uncertainty relating to nature and climate conditions; laws and regulations regarding the protection of the environment (including greenhouse gas emission reduction and other decarbonization requirements and the uncertainty surrounding the interpretation of omnibus Bill C-59 and the related amendments to the Competition Act (Canada); risks associated with political instability and changes to the regulations governing the Company’s business operations; changes in national and local government legislation, taxation, controls, regulations and political or economic developments in countries in which the Company does or may carry on business; risks associated with war, hostilities or other conflicts, such as the Ukrainian – Russian, and Israeli – Hamas conflicts, and the impacts they may have on global economic activity; risks relating to the termination of the Company’s mining concessions in certain circumstances; developing and maintaining relationships with local communities and stakeholders; risks associated with losing control of public perception as a result of social media and other web-based applications; potential opposition to the Company’s exploration, development and operational activities; risks related to the Company’s ability to obtain adequate financing for planned exploration and development activities; property title matters; risks related to the ability to retain or extend title to the Company’s mineral properties; risks relating to the integration of businesses and assets acquired by the Company; impairments; risks associated with climate change legislation; reliance on key personnel; adequacy of insurance coverage; operational safety and security risks; legal proceedings and potential legal proceedings; uncertainties relating to general economic conditions; risks relating to a global pandemic, which could impact the Company’s business, operations, financial condition and share price; competition; fluctuations in metal prices; risks associated with entering into commodity forward and option contracts for base metals production; fluctuations in currency exchange rates and interest rates; tax audits and reassessments; risks related to hedging; uncertainty relating to concentrate treatment charges and transportation costs; sufficiency of monies allotted by the Company for land reclamation; risks associated with dependence upon information technology systems, which are subject to disruption, damage, failure and risks with implementation and integration; labor relations issues; as well as those factors discussed under “Risk Factors” in the Company's Annual Information Form for the fiscal year ended December 31, 2024. Although the Company has attempted to identify important factors that could cause actual actions, events, or results to differ materially from those described in Forward-looking Statements, there may be other factors that cause actions, events or results to differ from those anticipated, estimated or intended.

Forward-looking Statements contained herein are based on the assumptions, beliefs, expectations and opinions of management, including, but not limited to, the accuracy of the Company’s current Mineral Resource and Mineral Reserve estimates; that the Company’s activities will be conducted in accordance with the Company’s public statements and stated goals; that there will be no material adverse change affecting the Company, its properties or its production estimates (which assume accuracy of projected ore grade, mining rates, recovery timing, and recovery rate estimates and may be impacted by unscheduled maintenance, labor and contractor availability and other operating or technical difficulties); the duration and effect of global and local inflation; the duration and impacts of geo-political uncertainties on the Company’s production, workforce, business, operations and financial condition; the expected trends in mineral prices, inflation and currency exchange rates; that all required approvals and permits will be obtained for the Company’s business and operations on acceptable terms; that there will be no significant disruptions affecting the Company's operations and such other assumptions as set out herein. Forward-looking Statements are made as of the date hereof and the Company disclaims any obligation to update any Forward-looking Statements, whether as a result of new information, future events, or results or otherwise, except as required by law. There can be no assurance that these Forward-looking Statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, investors should not place undue reliance on Forward-looking Statements.

Cautionary Note to United States Investors Concerning Estimates of Reserves and Resources

All reserve and resource estimates included in this news release have been prepared in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101") and the Canadian Institute of Mining, Metallurgy, and Petroleum Definition Standards on Mineral Resources and Mineral Reserves. NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for public disclosure by a Canadian company of scientific and technical information concerning mineral projects. All Mineral Reserve and Mineral Resource estimates contained in the technical disclosure have been prepared in accordance with NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum Definition Standards on Mineral Resources and Reserves. Canadian standards, including NI 43-101, differ significantly from the requirements of the Securities and Exchange Commission, and mineral reserve and resource information included in this news release may not be comparable to similar information disclosed by U.S. companies.

Appendix 1

Drill holes completed after July 7, 2025, are shown in italics

HoleIDEasting (WGS84_29N)Northing (WGS84_29N)Elev. (m)EOH1,2 Depth (m)UTM AzimuthDipDepth2,3 From (m)Depth2 To (m)Drilled2 Width (m)ETW4 (m)Au (ppm)Hole Type5Area
DSDD4082325991426198145110150-50424864.81.5DDSouthern Arc
DSDD4092326661426221146147150-50NSI    DDSouthern Arc
DSDD4102325881426263146164150-50394343.22.2DDSouthern Arc
       6172118.80.9DDSouthern Arc
DSDD4112325561426219145134150-50NSI    DDSouthern Arc
DSDD4122326311426245146150150-5013013332.41.8DDSouthern Arc
DSDD4132327171426204145119150-50NSI    DDSouthern Arc
DSDD4142324041426439148150150-50687464.84.5DDSouthern Arc
DSDD4152325891426101143146150-50NSI    DDSouthern Arc
DSDD4162326741426174145152150-50NSI    DDSouthern Arc
DSDD4172324541426461148117150-50NSI    DDSouthern Arc
DSDD418232366142636414712690-503153.7522.7518.26.3DDSouthern Arc
      incl404110.823.3DDSouthern Arc
      and424310.814.2DDSouthern Arc
      and454721.617.9DDSouthern Arc
       6171108.01.9DDSouthern Arc
DSDD419232602142626214611490-5091343.25.5DDSouthern Arc
      incl101221.6Core LossDDSouthern Arc
      and121310.821.2DDSouthern Arc
DSDD420232563142626114613790-5098.3990.70.628.5DDSouthern Arc
DSDD421232405142636014710890-5056.4561.354.93.96.8DDSouthern Arc
      incl586021.614.5DDSouthern Arc
DSDD422232218142613214511390-50NSI    DDSouthern Arc
DSDD4232326011426078142125335-50NSI    DDSouthern Arc
DSDD4312323501426410147237150-5058.3634.73.89.8DDSouthern Arc
      incl585910.657.8DDSouthern Arc
       841042016.02.7DDSouthern Arc
      incl878810.813.3DDSouthern Arc
      and949510.818.3DDSouthern Arc
       121133.7512.7510.23.7DDSouthern Arc
      incl12712810.817.3DDSouthern Arc
       141146.154.11.3DDSouthern Arc
      incl14214310.8Core LossDDSouthern Arc
       1561913528.01.9DDSouthern Arc
DSDD4332323031426394147129150-50919764.83.8DDSouthern Arc
      incl929310.810.7DDSouthern Arc
       1031201713.67.9DDSouthern Arc
      incl11011221.646.6DDSouthern Arc
      and119119.50.50.419.4DDSouthern Arc
DSDD4342323801426482148172150-50NSI    DDSouthern Arc
DSDD435232442142641614792150-50NSI    DDSouthern Arc
DSDD436232388142643714892150-50NSI    DDSouthern Arc
DSDD437232173142613414519890-50909554.01.0DDSouthern Arc
DSDD438232409142630414781150-50NSI    DDSouthern Arc
DSDD4392323251426355147113150-50NSI    DDSouthern Arc
DSDD4402328661426115144144330-5022.2263.83.02.6DDSouthern Arc
       30512116.86.3DDSouthern Arc
      incl30.7321.351.110.3DDSouthern Arc
      and343732.410.6DDSouthern Arc
      and414210.810.4DDSouthern Arc
      and434410.819.4DDSouthern Arc
      and454610.821.2DDSouthern Arc
       54.26813.811.03.7DDSouthern Arc
      incl555610.813.6DDSouthern Arc
DSDD4412323381426463148137150-50117.3512911.659.31.4DDSouthern Arc
DSDD442232197142620114610190-50NSI    DDSouthern Arc
DSDD4432327991426122145105330-5021086.40.8DDSouthern Arc
       16291310.43.0DDSouthern Arc
       3745.558.556.80.8DDSouthern Arc
       5166.615.612.55.0DDSouthern Arc
      incl58.45601.551.211.6DDSouthern Arc
      and626310.824.2DDSouthern Arc
       7576.21.21.05.7DDSouthern Arc
DSDD444232380142638514784150-5030704032.04.5DDSouthern Arc
      incl404221.614.0DDSouthern Arc
      and454610.833.5DDSouthern Arc
      and485021.613.0DDSouthern Arc
      and585910.813.1DDSouthern Arc
DSDD445232176142616314514090-50868932.41.8DDSouthern Arc
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DSR8952322981426361147132150-50NSI    RCSouthern Arc
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       881021411.21.0RCSouthern Arc
DSR993232443142635014760150-50NSI    RCSouthern Arc
              

Notes:

1. EOH: End of hole
2. Depths and widths reported to nearest significant decimal place
3. NSI: No significant intercepts
4. ETW: Estimated true width
5. RC: reverse circulation drilling | DD: diamond drilling tail | RCD: reverse circulation drilling with diamond tail

A PDF accompanying this announcement is available at http://ml.globenewswire.com/Resource/Download/992285df-91d1-42ac-a55c-303c03450396

Photos accompanying this announcement are available at
https://www.globenewswire.com/NewsRoom/AttachmentNg/aa97a35a-6273-42d9-8558-f62a373f53c9
https://www.globenewswire.com/NewsRoom/AttachmentNg/9e4303c3-d816-480a-a619-3f67e3de0d14
https://www.globenewswire.com/NewsRoom/AttachmentNg/cd07810d-e755-49d1-97f5-95f811f4d1e8


FAQ

What were the latest drilling results from Fortuna's (FSM) Diamba Sud Gold Project?

The latest drilling results featured a significant intercept of 22.7 g/t gold over 21.6 meters from drillhole DSDD488 at a depth of 53 meters.

What is the current resource estimate for FSM's Southern Arc deposit?

The maiden Inferred Mineral Resource estimate for Southern Arc is 3.9 Mt averaging 1.57 g/t Au containing 194,000 ounces of gold.

When will Fortuna Mining resume drilling at Diamba Sud?

Drilling is scheduled to resume in mid-September 2025, following the end of the rainy season.

How many drill holes has Fortuna completed in its latest exploration program?

Fortuna completed 152 reverse circulation and diamond core drill holes totaling 21,234 meters, with 53 holes completed after the resource estimate data cutoff.

When will Fortuna (FSM) release an updated resource estimate for Diamba Sud?

Fortuna plans to release an updated resource estimate in the first quarter of 2026, which will include the additional 53 holes and planned Q4 2025 drilling.
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