All monetary amounts are expressed in U.S. dollars, unless otherwise indicated.

Toronto, Ontario--(Newsfile Corp. - January 10, 2025) - IAMGOLD Corporation (TSX: IMG) (NYSE: IAG) ("IAMGOLD" or the "Company") is pleased to announce that the Company has filed a technical report for the Westwood Mine Complex ("Westwood" or the "Project"), titled "Technical Report on the Westwood Complex, Quebec, Canada" (the "2024 Westwood Technical Report") dated September 30, 2024.

The 2024 Westwood Technical Report was prepared by representatives of IAMGOLD, Norda Stelo Inc., and ASA Geotech Inc., each of whom is a "qualified person" (a "QP"), in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101"), as reported in the Company's news release dated December 5, 2024.

The 2024 Westwood Technical Report can be found on the Company's website at www.iamgold.com, as well as on SEDAR at www.sedarplus.ca and EDGAR at www.sec.gov/edgar.shtml