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 16, 2023) - IAMGOLD Corporation (NYSE: IAG) (TSX: IMG) ("IAMGOLD" or the "Company") announces its updated Mineral Reserves and Mineral Resources ("MRMR") statement as of December 31, 2022 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

2021 2022 ?

Tonnes
(000s) Grade
(g/t) Contained Ounces
(000s) Tonnes
(000s) Grade
(g/t) Contained Ounces
(000s) Contained Ounces
(000s) %
P&P reserves2 364,831 1.1 12,392 317,179 1.1 11,598 -793 -6%
M&I resources1,3 646,522 1.1 22,103 667,674 1.1 24,137 +2,035 +9%
Inferred resources3 310,533 1.1 11,085 297,494 1.0 9,393 -1,693 -15%


M&I Mineral Resources are inclusive of Mineral Reserves.
2022 Mineral Reserves estimated as of December 31, 2022, using a gold price of $1,300 per ounce for Essakane, Rosebel, Saramacca, Westwood and Cote Gold; and a gold price of $1,200 per ounce for the Boto Gold Project; and $1,350 per ounce for the Grand Duc satellite pit at Westwood; and $1,500 per ounce for the Fayolle satellite pit at Westwood.
Mineral Resources estimated as of December 31, 2022, using a gold price of $1,500 per ounce for the Essakane, Rosebel, Saramacca, Côté Gold Project, Boto Gold Project, Diakha-Siribaya Gold Project, Nelligan, Monster Lake, Pitangui Project, Gossey deposit, and the Grand Duc and Fayolle satellite pits at Westwood; and $1,500 per ounce using a 6.2g/t (Ordinary Kriging) and 7.4g/t (Multiple Indicator Kriging) Au cut-off grade over a minimum width of 2.6 metres for Westwood.
Mineral Reserves

TABLE 2: ATTRIBUTABLE RESERVES RECONCILIATION

Contained Ounces
(000s) % ?
Reserves (December 31, 2021) 12,392 -
Revisions to economic parameters -343 -3%
2022 mine depletion -580 -5%
Adjustments to ore stockpiles -59 0%
Other adjustments (drilling, additions, etc.) +188 +2%
Reserves (December 31, 2022) 1 11,598 -6%


Figures may not add due to rounding.
Attributable proven and probable gold Mineral Reserves ("reserves") totaled 11.6 million ounces, a decrease of 0.8 million ounces or 6% relative to the prior year MRMR statement;
The decrease was primarily related to mine depletion at all operations (580,000 ounces) reflecting the Company's attributable gold production of 713,000 ounces in 2022, and the revision of economic parameters applying higher mining costs across the operations;
Reserves grade of 1.1 grams per tonne gold ("g/t") remained unchanged on a consolidated basis;
There was no change in the reserve gold price assumption of $1,300 per ounce for Essakane, Rosebel and Saramacca;
Westwood and Côté Gold increased the reserve gold price assumption to $1,300 per ounce, up from $1,200 per ounce previously. The Grand Duc satellite pit at Westwood continued to use $1,350 per ounce, and the Fayolle satellite pit at Westwood used a reserve gold price of $1,500 per ounce.
For the Boto Gold project, the Company maintained its $1,200 per ounce gold price assumption for estimating mineral reserves.
TABLE 3: ATTRIBUTABLE RESERVES COMPARISON SUMMARY

Contained Ounces
(000s) Contained Ounces
?

2021 2022 (000s) %
Essakane (90%) 2,355 1,855 -500 -21%
Westwood (100%) 659 616 -43 -7%
Côté Gold (64.75%) 4,658 4,645 -13 -0%
Rosebel (95%)2 2,466 2,322 -144 -6%
Saramacca (66.5%)2 820 727 -93 -11%
Boto Gold (90%)3 1,434 1,434 - -
Reserves 1 12,392 11,598 -793 -6%


Figures may not add due to rounding.
On February 1, 2023, IAMGOLD completed the previously announced sale of the Company's interests in Rosebel and Saramacca.
On December 20, 2022, IAMGOLD announced that it had entered into definitive agreements to sell the Company's interests in its exploration and development projects in Senegal, Mali and Guinea - inclusive of the Boto Gold Project.
Mineral Resources

TABLE 4: ATTRIBUTABLE M&I RESOURCES COMPARISON SUMMARY

Contained Ounces
(000s) Contained Ounces
?

2021 2022 (000s) %
Essakane (90%) 2,901 2,569 -332 -11%
Westwood (100%) 1,639 2,353 +714 +44%
Côté Gold (64.75%) 6,605 6,608 +4 +0%
Gosselin (64.75%) 2,169 2,169 - -
Nelligan (75%) -- 1,478 +1,478 NA
Monster Lake (100%) -- -- - NA
Pitangui (100%) 470 470 - -
Gossey (90%) 262 262 - -
Rosebel (95%)2 4,551 4,250 -301 -7%
Saramacca (66.5%)2 1,008 956 -51 -5%
Boto Gold (90%)3 1,830 1,830 - -
Diakha-Siribaya (90%)3 669 1,193 +523 +78%
M&I Resources 1 22,103 24,137 +2,035 +9%


Figures may not add due to rounding.
On February 1, 2023, IAMGOLD completed the previously announced sale of the Company's interests in Rosebel and Saramacca.
On December 20, 2022, IAMGOLD announced that it had entered into definitive agreements to sell the Company's interests in its exploration and development projects in Senegal, Mali and Guinea - inclusive of the Boto Gold Project.
Attributable measured and indicated ("M&I") resources totaled 24.1 million ounces, an increase of 2.0 million ounces or 9% relative to the prior year MRMR statement;
Mineral resources increase primarily as a result of the updated MRMR statement at Nelligan (refer to Company press release dated January 12, 2023) and upgrading of resources at Westwood;
There was no change in the gold price assumption for estimating mineral resources at Essakane, Rosebel, development, and exploration properties ($1,500 per ounce of gold). Mineral Resources for Westwood underground have been estimated using a 6.2g/t (OK) and 7.4g/t (MIK) Au cut-off grade over a minimum width of 2.6 metres, using a $1500/oz gold price.

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