Adrian Day

Mohamed Sidibe

David Kranzler

Don DeMarco

Eric Winmill

Tony Christ

John Pereira

- Fortuna Mining Corp. (FSM) announced a Preliminary Economic Assessment (PEA) for its Diamba Sud Gold Project in Senegal, projecting an **after-tax NPV5% of $563 million** and an **Internal Rate of Return (IRR) of 72%** at a gold price of $2,750 per ounce, with a **payback period of ten months**.  **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:0]** **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:1]** 
- The project's initial capital cost is estimated at approximately **$283.2 million**.  **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:0]** **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:1]** 
- Diamba Sud is expected to produce an average of **147,000 ounces of gold per year** during its first three years, at an All-In Sustaining Cost (AISC) of **$904 per ounce**.  **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:0]** **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:1]** 
- A construction decision is anticipated in the **first half of 2026**, with the **first gold pour targeted for the second quarter of 2028**.  **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:0]** **[1341335_0001104659-25-099626_tm2528803d1_ex99-1.htm:6]**

Fortuna Mining Corp. Reports Robust PEA for Diamba Sud Gold Project

- Fortuna Mining Corp. reported **gold equivalent production of 72,462 ounces** for the third quarter of 2025.  **[1341335_0001104659-25-097832_tm2528291d1_ex99-1.htm:0]** 
- Consolidated gold equivalent production for the **first nine months of 2025 totaled 251,871 ounces**.  **[1341335_0001104659-25-097832_tm2528291d1_ex99-1.htm:0]** 
- The company **reiterated its updated annual production guidance for 2025** in the range of **309,000 to 339,000 gold equivalent ounces**.  **[1341335_0001104659-25-097832_tm2528291d1_ex99-1.htm:0]** 
- The Ségéla Mine produced **38,799 ounces of gold** in Q3 2025 and is on track to exceed the upper end of its guidance.  **[1341335_0001104659-25-097832_tm2528291d1_ex99-1.htm:0]** **[1341335_0001104659-25-097832_tm2528291d1_ex99-1.htm:1]**

Fortuna Mining Corp. Reports Q3 2025 Production Results and Reiterates 2025 Guidance

- Fortuna Mining Corp. has **filed an Environmental and Social Impact Assessment (ESIA)** for its Diamba Sud Gold Project in Senegal, a crucial step towards a **construction decision in the first half of 2026**.  **[1341335_0001104659-25-097405_tm2528195d1_ex99-1.htm:1]** 
- The **Preliminary Economic Assessment (PEA)** for the Diamba Sud Gold Project is on track for **completion in the fourth quarter of 2025**, with a Definitive Feasibility Study (DFS) to follow in the first half of 2026.  **[1341335_0001104659-25-097405_tm2528195d1_ex99-1.htm:1]** 
- Year-to-date in 2025, **52,110 meters have been drilled**, leading to a **53 percent expansion in Measured and Indicated** mineral resources and a **93 percent expansion in Inferred categories** for the Diamba Sud project.  **[1341335_0001104659-25-097405_tm2528195d1_ex99-1.htm:1]**

Fortuna Mining Corp. Files ESIA for Diamba Sud Gold Project and Updates PEA Status

- **Fortuna Mining Corp.** has entered into a binding Heads of Agreement with **DeSoto Resources Limited** to establish an exploration alliance and joint venture in Guinea's Siguiri Basin.  **[1341335_0001104659-25-095939_tm2527852d1_ex99-1.htm:0]** 
- The alliance is focused on identifying "Go Projects" with the potential to host multi-million-ounce gold deposits.  **[1341335_0001104659-25-095939_tm2527852d1_ex99-1.htm:0]** 
- In the joint venture phase for "Go Projects," Fortuna will hold a **70 percent** interest, with DeSoto holding **30 percent**.  **[1341335_0001104659-25-095939_tm2527852d1_ex99-1.htm:0]** 
- Fortuna will solely fund exploration for these projects until the later of **three years** or **US$12.5 million** in cumulative expenditure.  **[1341335_0001104659-25-095939_tm2527852d1_ex99-1.htm:0]**

FORTUNA MINING (FSM)