Mr. Renaud Adams reports

IAMGOLD ANNOUNCES FIRST GOLD POUR AT COTE GOLD

Iamgold Corp. has completed its first gold pour at the Cote gold mine, located in Ontario, Canada. Cote gold is operated as a joint venture between Iamgold, as the operator, and Sumitomo Metal Mining Co. Ltd.

"I am delighted to announce that Cote gold achieved the milestone of first gold pour, less than 90 days since the start of the precommissioning activities," said Renaud Adams, president and chief executive officer of Iamgold. "With Cote gold on-line, Iamgold now has three operating mines, joining Essakane in Burkina Faso and Westwood in Quebec, Canada. This achievement represents the culmination of over 15 million hours of work over four years of construction -- an incredible effort for the team on the ground as the project cost to first gold remains in line with the updated budget estimate while maintaining a near impeccable safety record. Further, I want to thank our partner Sumitomo for their continued support and dedication. This achievement is monumental for the Cote team, Iamgold, Sumitomo and for the gold mining industry itself."

Commissioning activities at Cote have been progressing well, with performance achieved in the crushing, HPGR and processing circuits within expectations, including power consumption. With first gold achieved, the next step and focus for Iamgold are on the ramp-up of the operation to commercial production in the third quarter toward the goal of exiting the year at a 90-per-cent throughput rate. Production guidance from Cote this year, on a 100-per-cent basis, is unchanged at 220,000 to 290,000 ounces of gold, assuming the remaining milestones are achieved. At steady run rate, Cote gold is expected to be within the largest operating gold mines in Canada with an expected mine life exceeding 18 years and significant opportunities for growth. On a project level, combining the Cote and Gosselin deposits, Cote has a total estimated measured and indicated mineral resource (1) of 16.5 million ounces with an additional 4.2 million ounces of inferred (1) resources, putting the project in exclusive company of large-scale Canadian assets.

Mr. Adams continued: "Cote is positioned as an innovation leader in our industry as the first gold mining project in North America designed and built for a fully automated haulage fleet. Automation not only brings significant benefits in health and safety and operating efficiencies but is a considerable step forward in the evolution of modern mining and the skilled work force of tomorrow. Further, this is just the beginning for Cote as we believe the project is the start of what will ultimately turn into a new mining district that will be a mining hub for decades to come."

About Iamgold Corp.

Iamgold is an intermediate gold producer and developer based in Canada with operating mines in North America and West Africa. The company has commenced production at the large-scale, long-life Cote gold mine in partnership with Sumitomo, which is expected 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 3,600 people and is committed to maintaining its culture of accountable mining through high standards of environmental, social and governance practices, including its commitment to zero harm, in every aspect of its business. Iamgold is listed on the New York Stock Exchange (IAG) and the Toronto Stock Exchange (IMG), and is one of the companies on the Jantzi Social Index, which is socially screened and market capitalization weighted, consisting of companies which pass a set of broadly based environmental, social and governance rating criteria.

Qualified person and technical information

The technical and scientific information relating to exploration activities disclosed in this document was prepared under the supervision of and verified and reviewed by Marie-France Bugnon, PGeo, vice-president, exploration, Iamgold. Ms. Bugnon is a qualified person as defined by National Instrument 43-101. The technical and scientific information in this news release has been reviewed and approved by Ms. Bugnon as applicable.

(1) Cote and Gosselin deposit mineral resources as of Dec. 31, 2023: measured and indicated mineral resources of 606.1 million tonnes of 0.85 gram per tonne gold equals 16.5 million ounces gold and inferred mineral resources of 184.5 Mt of 0.70 g/t Au equals 4.2 Moz Au.

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