Mr. Renaud Adams reports

IAMGOLD ANNOUNCES COTE GOLD ACHIEVING NAMEPLATE THROUGHPUT

On Saturday, June 21, 2025, Iamgold Corp.'s Cote gold mine reached a major milestone as the processing plant operated at the nameplate capacity of 36,000 tonnes per day on average over 30 consecutive days.

"I would like to congratulate our Cote gold teams, who demonstrated remarkable determination and commitment to bring Cote gold on-line and advance it to nameplate throughput rate within 15 months," said Renaud Adams, president and chief executive officer of Iamgold. "To bring a gold project from first gold to the design nameplate rate within this time frame, while ensuring a safe workplace for all, exemplifies the commitment to excellence and accountability that is at the core of Iamgold today. This milestone was made possible as momentum built from March in which the Cote processing plant achieved an average monthly throughput rate of 90 per cent of nameplate and then reached 96 per cent over a 30-day period in April. The achievement confirms our confidence in the Cote gold production guidance of 360,000 to 400,000 ounces on a 100-per-cent basis, with costs expected to decline through the year. Further, we are excited at the opportunities the installation of the second cone crusher will bring, including improving plant availability and maintenance cycles, while providing potential for further throughput increases."

About Iamgold Corp.

Iamgold is an intermediate gold producer and developer based in Canada with operating mines in North America and West Africa, including Cote (Canada), Westwood (Canada) and Essakane (Burkina Faso). On March 31, 2024, the company commenced production at Cote, in partnership with Sumitomo Metal Mining Co. Ltd., a mine that has the potential to be among the largest gold mines in Canada. In addition, the company has an established portfolio of early-stage and advanced exploration projects within high-potential mining districts. Iamgold employs approximately 3,700 people and is committed to maintaining its culture of accountable mining through high standards of environmental, social and governance practices.