IAMGOLD Corporation announced assay results from its 2022 delineation diamond drilling program on its wholly-owned Karita Gold project in north-eastern Guinea. The project is located along the prolific Senegal-Mali Shear Zone in West Africa, between the Company's Boto Gold Project in Senegal eight kilometres to the north, and its Diakha-Siribaya Gold project in Mali three kilometres to the south. The assay results returned represent 42 diamond drill holes totaling 10,230.5 metres from the ongoing 2022 delineation drilling program, which will involve the completion of 22,000 to 24,000 metres of drilling, designed to delineate the mineralized zones on a nominal 100 x 50 metre collar spacing in order to support a future initial mineral resource estimate.

To date, approximately 18,225 metres in 70 DDH holes have been completed. Additional assay results will be reported once they are received, validated and compiled. Approximately 4,000 to 6,000 metres of additional drilling is planned in the second half of the year as part of the 2022 delineation drilling program.

The results of the drilling program will be compiled, validated and interpreted to develop a deposit model to support the completion of an initial mineral resource estimate planned for 2023. The rita Gold project is wholly-owned by IAMGOLD and is held under an exploration permit that covers approximately 100 square kilometres in Guinea, on the Birimian aged Kédougou- éniéba inlier of the West African Craton region along the borders with Senegal, Guinea and Mali. In 2017, the Company completed a reconnaissance geology and termite mound eochemical sampling program over the Karita permit to evaluate the interpreted extension of the Boto-Diakha mineralized trend in Guinea.

The area is thought to cover an xtension of he regionally important and prolific Senegal-Mali Shear Zone along trend between IAMGOLD's Boto Gold deposits in Senegal to the north, and its Diakha deposit on the iribaya roject in Mali to the south. The sampling program identified an extensive gold geochemical anomaly delineated over a nearly 2 kilometre strike length, and similar to that bserved to be associated with the deposits occurring at both Boto and Diakha. The initial 2019 drilling program was designed to evaluate the geochemical anomaly for the presence of ineralization nd involved the completion of wide spaced lines of reverse circulation drilling, which confirmed the presence of multiple zones of mineralization hosted within an albite + hematite ltered sandstone metasedimentary unit over a 1.6 kilometre strike length.

After extensive access restrictions arising from the global COVID-19 pandemic, exploration resumed in 2022 ith the objective of delineating this new discovery to evaluate its resource potential. Results to date have confirmed the presence of shallow oxide mineralization extending at depth to fresh rock where mineralization is observed to be hosted in altered and locally brecciated metasedimentary lithologies exhibiting albite - silica - hematite alteration associated with isseminated to locally narrow semi-massive sulphide veins and occasional visible gold. Overall, the mineralization shows similarities to IAMGOLD's Boto and Diakha deposits located along the same trend.

The drilling results contained in this news release have been prepared in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects. The Qualified Person responsible for the supervision of the preparation, verification and review of the technical information in this release is Philippe Biron, P. Geo., Regional Senior Geologist, West Africa for IAMGOLD. Mr. Biron is a QP for the purposes of NI 43-101 with respect to the technical information being reported on.

The information in this news release was reviewed and approved by Craig MacDougall, P.Geo, Executive Vice President, Growth for IAMGOLD. Mr. MacDougall is a QP for the purposes of NI 43-101. The technical information has been included herein with the consent and prior review of the above noted QPs.

The sampling of, and assay data from, DDH core are monitored through the implementation of a quality assurance - quality control (QA-QC) program designed to follow industry best practice and include the insertion of certified reference standards. Core samples from diamond drilling are collected from three diamond rigs, at generally one meter intervals, under the direct supervision of IAMGOLD geologists and field technicians. Core samples are sawed in half, with one half sent to the lab for prep and assay, and the other retained for reference purposes.

The assay samples were prepared and assayed at Bureau Veritas Analytical Laboratory in Bamako, using a standard fire assay with a 50-gram charge and an Atomic Absorption finish (FA450). Samples which returned values greater than 10 g/t Au are being re-assayed using a gravimetric finish.