Mr. Renaud Adams reports

IAMGOLD REPORTS NON-WORK RELATED FATALITY AT CÔTÉ GOLD PROJECT

On the morning of Friday, Sept. 29, 2023, an individual employed by a contractor at Iamgold Corp.'s Cote gold project, located in Ontario, Canada, was found unconscious near the camp accommodations complex. Attempts to resuscitate were unsuccessful and the individual was pronounced deceased. The incident occurred while the individual was not on shift or engaged in mining or construction-related activities. Authorities are on site investigating and the cause of death remains unknown.

Renaud Adams, president and chief executive officer of Iamgold, commented: "On behalf of all of us at Iamgold, I would like to express our deepest sympathy and condolences to the family of the individual who passed away this morning. In the coming days and weeks, investigators and authorities will have the company's full co-operation as we examine every detail to determine the cause of this tragic incident. The health and safety of people is our No. 1 priority and the tragic events of today underscore why we can never lose sight of this commitment. As the investigation proceeds, the family, friends and colleagues of the individual are foremost in our thoughts, and we are focused on providing them with the support they need at this difficult time."

The company will provide further updates as warranted.

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 is building the large-scale, long-life Cote gold project in Canada in partnership with Sumitomo Metal Mining Co. Ltd., which is expected to commence production in early 2024. In addition, the company has an established portfolio of early-stage and advanced exploration projects within high potential mining districts in the Americas. Iamgold employs approximately 3,300 people and is committed to maintaining its culture of accountable mining through high standards of environmental, social and governance (ESG) 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 (JSI), a socially screened market capitalization-weighted index, consisting of companies which pass a set of broadly based environmental, social and governance rating criteria.