All dollar amounts are in U.S. dollars unless otherwise indicated; Measured and Indicated Resource Estimates are quoted Inclusive of Mineral Reserves for all sites and projects

Toronto, Ontario--(Newsfile Corp. - February 18, 2020) - IAMGOLD Corporation ("IAMGOLD" or the "Company") today announced its 2019 year-end mineral reserve and resource statement. (See attached table for more details.)

Total attributable Proven and Probable Reserves decreased by 6% to 16.7 million ounces at the end of 2019 from 17.9 million ounces of gold at the end of 2018. The decrease was primarily due to mine depletion during the year given the Company's attributable gold production of 762,000 ounces. There was no change in the $1,200 per ounce gold price assumption for estimating Mineral Reserves at the Company's owned and operated mines and development projects.

Total attributable Measured and Indicated Resources (inclusive of Reserves) decreased overall by 2% or 0.7 million ounces to 27.2 million ounces of gold at the end of 2019. Total attributable Inferred Resources increased by 38% or 3.3 million ounces to 12.0 million ounces of gold at the end of 2019, primarily due to the declaration of a Mineral Resource estimate at the Nelligan Gold Project in Quebec and the completion of an updated Mineral Resource estimate at the Côté Gold Project in Ontario. There were no changes in the gold price assumptions for estimating mineral resources at Essakane, Rosebel, and resource-stage projects ($1,500 per ounce) or at Westwood ($1,200 per ounce).

Gordon Stothart, President and COO of IAMGOLD, commented, "In 2019, we made further progress in advancing the resource stage projects in our pipeline. At the Nelligan Gold Project in Quebec, we declared an initial mineral resource and continued to identify additional resources at the Côté Gold Project. We also announced an updated mineral resource estimate at Pitangui in Brazil, successfully converting 52% of its resources to the indicated category. In Ontario, we discovered Gosselin just 1.5 kilometres from the proposed Côté pit, and reported positive drill results from this zone. In Quebec, we continued to explore the Rouyn Gold Project, located approximately 45 kilometres southwest of Westwood, and reported encouraging drill results. In Guinea, situated between our Boto Gold Project in Senegal and our Diakha-Siribaya Project in Mali, we announced an exciting new discovery with high grade intersections on the Karita Gold Project. In addition to the ongoing resource development programs at our existing operations, the potential for delineation of additional resources from our planned 2020 exploration program is strong. We look forward to providing updates from the drill bit as the year progresses."

Forward Looking Statement

This news release contains forward-looking statements. All statements, other than of historical fact, that address activities, events or developments that the Company believes, expects or anticipates will or may occur in the future (including, without limitation, etc.etc..

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