IAMGOLD 2025 Drill Program Extends Mineralization at Nelligan and Monster Lake

Executive Summary

• IAMGOLD released assay results from 27 Nelligan and 16 Monster Lake drill holes (≈21,720 m total), confirming significant extensions of mineralized zones at both projects.
• High‑grade intercepts include:
• Nelligan Zone 36 – 20.6 m @ 1.93 g/t Au; 7.5 m @ 4.28 g/t Au (including 1.5 m @ 18.1 g/t Au).
• Renard Zone – 13.5 m @ 3.15 g/t Au (incl. 6 m @ 7.91 g/t Au); 11.9 m @ 1.98 g/t Au (incl. 1.5 m @ 115.5 g/t Au).
• Footwall Zone – 2.7 m @ 17.5 g/t Au; 7.5 m @ 7.48 g/t Au (incl. 1.5 m @ 25.4 g/t Au).
• Monster Lake Megane Zone – 9.0 m @ 23.4 g/t Au (incl. 5 m @ 40.7 g/t Au; 0.7 m @ 191.5 g/t Au).
• Lower Shear Zone – 4.9 m @ 127.3 g/t Au (incl. 0.65 m @ 857 g/t Au).
• Results support ongoing expansion of the combined Chibougamau camp, now estimated at ~9 Moz gold resources, and justify further step‑out drilling to deepen and widen the resource envelope.

Key Details

• Drilling Scope – Nelligan: 27 holes, 11,583 m (24 infill + 3 deep). Monster Lake: 16 holes, 10,137.5 m (12 delineation + 4 deep).
• Significant Intercepts – see Executive Summary; all intercepts reported with ≥0.50 g/t Au cut‑off and minimum g·m of 5.
• Depth Extension – Nelligan drilling now reaches >600–700 m vertical depth, extending mineralization down‑plunge beyond previous limits (300–350 m).
• Resource Impact – Updated intercepts will be incorporated into the deposit model and are expected to feed a future Mineral Resource estimate upgrade (conversion of Inferred → Indicated).
• Next Steps – Continue infill drilling to improve classification, test near‑surface eastern extension, and pursue deeper step‑out holes; ongoing metallurgical and engineering studies.
• Qualified Persons – Shana Dickenson, P.Geo.; Adrien Zamparutti, P.Geo.; Maxime Douëllou, P.Geo.; reviewed by Marie‑France Bugnon, VP Exploration (QP).
• Quotes – Renaud Adams (President & CEO): “These results confirm our decision to continue to increase our exploration activities… positioning Nelligan among the largest gold projects in Canada.”
• Forward‑Looking Statements – The release contains typical forward‑looking language regarding future resource updates, drilling plans, and project development.

Notable Quotes

“I want to congratulate our exploration team as they continue to expand the mineralized envelope of Nelligan and intersect high‑grade veins at Monster Lake.” – Renaud Adams, President & CEO, IAMGOLD
“The results of our winter drilling program demonstrate the potential to expand the current resources on both deposits… The widths of the mineralized sequence intersected in the deeper holes at Nelligan do not show any sign of pinching and encourage further step‑out drilling.” – Marie‑France Bugnon, VP Exploration, IAMGOLD