All amounts are in US dollars, unless otherwise indicated.
Measured and indicated resources are quoted inclusive of proven and probable reserves for all sites and projects.

Toronto, Ontario--(Newsfile Corp. - February 23, 2022) - IAMGOLD Corporation (NYSE: IAG) (TSX: IMG) ("IAMGOLD" or the "Company") announces its updated Mineral Reserves and Mineral Resources ("MRMR") statement as of December 31, 2021 prepared in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101"). A complete MRMR table (Table 6) including a detailed by-asset breakdown can be found at the end of this news release, with a summary of year over year changes as follows:

TABLE 1: ATTRIBUTABLE MRMR COMPARISON SUMMARY 1

2020 3 2021 ?

Tonnes (000s) Grade (g/t) Contained Ounces (000s) Tonnes (000s) Grade
(g/t) Contained Ounces (000s) Contained Ounces (000s) %
see & read more on
https://www.iamgold.com/English/investors/news-releases/news-releases-details/2022/IAMGOLD-Reports-2021-Attributable-Reserves-of-12.4-Million-Ounces-and-Attributable-MI-Resources-of-22.1-Million-Ounces/default.aspx

Footnotes from the Mineral Reserves and Mineral Resources statement in Table 6: Mineral Reserves and Mineral Resources of Gold Operations as of December 31, 2021 apply.
M&I Mineral Resources are inclusive of Mineral Reserves.
2020 Mineral Reserves estimated as of December 31, 2020, using a gold price of $1,200 per ounce for Essakane, Rosebel, Saramacca, Westwood, Côté Gold Project and the Boto Gold Project, and a gold price of $1,350 per ounce for the Grand Duc satellite pit at Westwood.
Mineral Resources estimated as of December 31, 2020, using a gold price of $1,500 per ounce for the Côté Gold Project, Boto Gold Project, Diakha-Siribaya Gold Project, Pitangui Project, Gossey deposit, Monster Lake Project, Essakane, Rosebel, and Saramacca, and $1,200 per ounce using a 5.5 g/t Au cut-off over a minimum width of 2.4 metres for Westwood.
Mineral Reserves