IAMGOLD Corporation (NYSE: IAG) (TSX: IMG) has announced assay results from its ongoing 2025–2026 drilling programs across its 100%-owned Nelligan Mining Complex in central Quebec. The results confirm depth extensions of mineralized zones at all three deposits — Nelligan, Monster Lake, and Philibert — which sit within a 15 km radius approximately 60 km southwest of Chibougamau. Investors may be watching these results closely as the company targets an updated Mineral Resource estimate for all three deposits by year-end and a Preliminary Economic Assessment thereafter.

Key Points

  • IAMGOLD Corporation (TSX: IMG / NYSE: IAG) operates the 100%-owned Nelligan Mining Complex in Quebec
  • Drilling at all three deposits — Nelligan, Monster Lake, and Philibert — has extended mineralized zones at depth, with standout high-grade intersections at Monster Lake including 7.3 m at 49.6 g/t Au
  • Nelligan holds Indicated resources of 3.7 million ounces and Inferred resources of 4.6 million ounces as of December 31, 2025; Monster Lake and Philibert carry additional ounces across both categories
  • Updated Mineral Resource estimates for the Complex are targeted for the end of this year, followed by a Preliminary Economic Assessment

Nelligan Depth Extensions and Infill Results Strengthen Resource Confidence

IAMGOLD reported assay results from 47 diamond drill holes totalling 20,641 metres at Nelligan, completed between June 2025 and June 2026. Highlights include 77.0 m at 2.23 g/t Au in hole NE-26-272 in Zone 36 and 37.28 m at 3.62 g/t Au in the Renard Zone in hole NE-26-297. The Footwall Zone returned 7.5 m at 14.37 g/t Au including 3.0 m at 33.8 g/t Au. Mineralization has been traced over a strike length of more than 1.8 kilometres and to a depth of 600 vertical metres, with the Renard Zone remaining open at depth. The 2026 drilling program was expanded from 18,000 metres to 30,000 metres, focused largely on converting Inferred Resources to Indicated.

Monster Lake Megane Zone Returns Exceptional High-Grade Intersections

At Monster Lake, 41 drill holes totalling 18,136 metres were completed between June 2025 and May 2026. The Megane Zone delivered headline intersections of 7.3 m at 49.6 g/t Au including 1.0 m at 155.6 g/t Au in hole ML-26-318, and 10.35 m at 22.99 g/t Au including 1.0 m at 144.6 g/t Au in ML-26-302. Depth extensions of the Megane Zone now reach 600 metres vertically. As of December 31, 2025, Monster Lake holds Indicated resources of 102,000 ounces at 13.0 g/t Au and Inferred resources of 499,000 ounces at 14.8 g/t Au. The company is also evaluating development of an exploration ramp from surface to provide underground drill platforms.

Philibert Inaugural Program Confirms Zones and Indicates Depth Potential

IAMGOLD released results from 65 drill holes totalling 18,309 metres at Philibert, completed between January and June 2026. Highlights from the Red Fox Zone include 20.5 m at 2.51 g/t Au and 14.8 m at 3.59 g/t Au. The Arctic Fox Zone returned 11.9 m at 6.05 g/t Au, while a deeper extension hole returned 29.3 m at 3.39 g/t Au. The program, originally planned at 20,000 metres, was increased to a target of 30,000 metres. Philibert was fully consolidated into IAMGOLD's portfolio following the acquisition of Northern Superior Resources completed in December 2025. As of December 31, 2025, Philibert holds Inferred resources of 1.7 million ounces at 1.10 g/t Au.