Lundin Gold Inc. (TSX: LUG) (Nasdaq Stockholm: LUG) (OTCQX: LUGDF) is pleased to announce continued success from its copper-gold porphyry exploration programs at its 100%-owned Fruta del Norte district in southeast Ecuador. Following the discovery of Sandia in 2025 and continued drilling success across the district, the Company now targets a maiden mineral resource estimate for the Sandia copper-gold porphyry in early 2027, marking an important milestone in advancing the first of the Company’s identified porphyry systems toward the resource stage.

Recent drilling continues to expand the Sandia deposit while also resulting in the discovery of two new mineralized porphyry systems, Sandia Northeast and Sandia Southeast, increasing the number of porphyry centres identified across the FDN district from five to seven.

Highlights

• Two New Porphyry Discoveries: Drilling at Sandia Northeast and Sandia Southeast has identified two additional copper-gold porphyry systems, increasing the total number of porphyry discoveries on the FDN concessions to seven.
• Sandia Continues to Expand: The deposit footprint has now grown to approximately 1,600 m strike x 700 m width x 1,000 m depth and remains open to the north, east and at depth. Sandia is currently the largest and highest-grade porphyry system identified on the FDN concessions.
• Sandia Maiden Resource Estimate Targeted for early 2027: Represents the first mineral resource milestone for the Company’s porphyry exploration program at FDN.

Highlights from drilling programs at Sandia, Sandia Northeast, and Sandia Southeast are outlined below, with detailed results provided in Appendix 1.

Jamie Beck, President and CEO, commented, “Targeting a maiden mineral resource estimate for Sandia in early 2027 marks an important milestone in the advancement of our copper-gold porphyry exploration program at Fruta del Norte. Since its discovery in 2025, Sandia has rapidly advanced to become the most mature of our porphyry discoveries and remains the largest and highest-grade porphyry system drilled to date on our concessions. Continued drilling is expanding the deposit in multiple directions and provides potential for growth beyond the limits of the planned inaugural resource estimate.

Equally important, the discovery of Sandia Northeast and Sandia Southeast demonstrates that Sandia is part of a broader cluster of mineralized porphyry centres. With seven porphyries now identified across our concessions, we are increasingly demonstrating the potential for a significant copper-gold district adjacent to Fruta del Norte and the known epithermal gold deposits.”

Drilling Highlights (not true widths)

Sandia

• Drill hole SND-2026-502 intersected 0.42% Cu, 0.08 g/t Au, 1.62 g/t Ag, and 17.05 ppm Mo (0.50% CuEq) over 551.30 m from 67.00 m, including:
  • 0.51% Cu, 0.11 g/t Au, 1.71 g/t Ag, and 14.14 ppm Mo (0.61% CuEq) over 307.95 m

• Drill hole SND-2026-510 intersected 0.38% Cu, 0.06 g/t Au, 1.93 g/t Ag, and 39.06 ppm Mo (0.46% CuEq) over 909.45 m from 29.00 m, including:
  • 0.45% Cu, 0.08 g/t Au, 2.38 g/t Ag, and 34.05 ppm Mo (0.56% CuEq) over 401.10 m

Sandia Northeast (Sandia NE)

• Drill hole SND-2026-498 intersected 0.22% Cu, 0.11 g/t Au, 0.82 g/t Ag, and 9.97 ppm Mo (0.31% CuEq) over 454.00 m from 278.70 m, including:
  • 0.26% Cu, 0.14 g/t Au, 0.90 g/t Ag, and 8.74 ppm Mo (0.37% CuEq) over 236.75 m

Sandia Southeast (Sandia SE)

• Drill hole TRL-2026-439 intersected 0.22% Cu, 0.05 g/t Au, 1.43 g/t Ag, and 19.20 ppm Mo (0.28% CuEq) over 172.40 m from 254.25 m, including:
  • 0.31% Cu, 0.07 g/t Au, 1.82 g/t Ag, and 14.84 ppm Mo (0.38% CuEq) over 52.45 m

SANDIA

Located approximately two kilometres from Fruta del Norte, Sandia is the Company’s most advanced porphyry discovery and is expected to become the first porphyry system on the FDN concessions to support a mineral resource estimate.

Drilling has now outlined a mineralized footprint measuring approximately 1,600 metres along strike, 700 metres in width and 1,000 metres vertically, while remaining open to the north, east and at depth. Recent drilling continues to expand the deposit and reinforce confidence in the geological model. In the northern sector of the deposit, drill hole SND-2026-502 extended the higher-grade domain and indicates further growth potential in that direction. In the central portion of the system, drill hole SND-2026-510 expanded mineralization to the east and at depth.

A total of 16,920 metres in 24 drill holes has now been completed at Sandia. Geological modelling is underway and all drilling results received to date are being incorporated into the model that will support the maiden mineral resource estimate targeted for early 2027. Four drill rigs are currently active at Sandia.

SANDIA NORTHEAST

Located approximately 500 metres northeast of Sandia, scout drilling testing a large Cu-Mo geochemical anomaly has led to the discovery of a new copper-gold porphyry system. The broad mineralized interval intersected in drill hole SND-2026-498 is associated with characteristic porphyry-style potassic alteration and A–type quartz veining, supporting the interpretation of another mineralized porphyry centre within the Sandia area. One drill rig is currently active at Sandia Northeast.

SANDIA SOUTHEAST

Sandia Southeast is located between the Sandia and Trancaloma deposits in a previously undrilled area. Recent drilling intercepted copper-gold mineralization associated with a porphyry-style hydrothermal alteration and supports the interpretation of another mineralized porphyry centre within the district. The sector highlights the exploration potential of the area between the two deposits and provides another target for follow-up drilling.

Figure 1: Map showing porphyry discoveries adjacent to FDN; Chontas not shown

Figure 2: Sandia Trancaloma long section showing recent drilling results at Sandia and Sandia SE

Figure 3: Sandia Trancaloma long section showing interpolated copper grades for main porphyries deposits Sandia, Sandia Southeast and Trancaloma

 Figure 4: Sandia and Sandia Northeast Cross Section

Qualified Persons and Technical Notes

The technical information contained in this News Release has been reviewed and approved by Andre Oliveira, P. Geo, Vice President, Exploration of the Company, who is a Qualified Person in accordance with the requirements of National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

Samples consist of half HQ and NQ-size diamond core that are split by diamond saw on site, prepared at the ALS laboratory in Quito, and analyzed by 50g fire assay and multi-element (ICP-AES/ICP-MS) at the ALS Laboratory in Lima, Peru.  The quality assurance-quality control program of Lundin Gold includes the insertion of certified standards of known gold content, blank and duplicate samples.  The remaining half core is retained for verification and reference purposes.  For further information on the assay, QA-QC, and data verification procedures, please see Lundin Gold’s most current Annual Information Form available under the Company’s profile at www.sedarplus.ca.

Copper equivalent calculation for reporting purposes only:   US$4.00/lb Cu, US$1,800/oz Au, US$30/oz Ag, and US$25/oz Mo with 80% metallurgical recoveries assumed for all metals.  The formula is: CuEq % = Cu % + (0.6562 * Au g/t) + (0.0109 * Ag g/t) + (0.0006 * Mo ppm).

About Lundin Gold

Lundin Gold, headquartered in Vancouver, Canada, owns the Fruta del Norte gold mine in southeast Ecuador.  Fruta del Norte is among the highest-grade operating gold mines in the world.

The Company’s board and management team have extensive expertise and are dedicated to operating Fruta del Norte responsibly.  The Company operates with transparency and in accordance with international best practices.  Lundin Gold is committed to delivering value to its shareholders through operational excellence and growth, while simultaneously providing economic and social benefits to impacted communities, fostering a healthy and safe workplace and minimizing the environmental impact.  Furthermore, Lundin Gold is focused on continued exploration on its extensive and highly prospective land package to identify and develop new resource opportunities to ensure long-term sustainability and growth for the Company and its stakeholders.