IAMGOLD closes sale of Bambadji stake in Senegal

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

Toronto, Ontario--(Newsfile Corp. - August 10, 2026) - IAMGOLD Corporation (TSX: IMG) (NYSE: IAG) ("IAMGOLD" or the "Company") today announced the completion of the sale of its indirect 35% interest in the Bambadji Joint Venture and its attributable interest in the Bambadji Sud exploration permit in Senegal (together, the "Bambadji JV") to Fortuna Mining Corp. ("Fortuna") as part of a transaction that generated approximately $70 million in cash proceeds to IAMGOLD, before taxes and transaction costs. The divestiture monetizes a non-core exploration asset and supports IAMGOLD's continued focus on its existing operating and development portfolio.

The Bambadji JV controls the Bambadji and adjacent Bambadji Sud exploration permits located in the Kédougou region of southeastern Senegal, approximately 850 kilometres southeast of Dakar along the border with Mali. Total consideration payable by Fortuna to the joint venture partners, Barrick Mining Corporation ("Barrick") and IAMGOLD, on a combined 100% basis consists of: $200 million in cash payable on closing; and a 0.5% net smelter return ("NSR") royalty, capped on the first 1.75 million ounces of gold produced from the Bambadji permit. The Bambadji JV was originally governed by a joint venture agreement dated May 23, 2016 between subsidiaries of IAMGOLD (35%) and Barrick (65%).

IAMGOLD's attributable share of the cash consideration is approximately $70 million, before Senegalese capital gains taxes and transaction costs, with the Company also retaining its proportionate share of the NSR royalty.

Fasken Martineau DuMoulin LLP acted as legal counsel to IAMGOLD in connection with the transaction.

About IAMGOLD

IAMGOLD is an intermediate gold producer and developer based in Canada with operating mines in North America and West Africa, including Côté Gold (Canada), Westwood (Canada) and Essakane (Burkina Faso). The Côté Gold Mine is among the largest gold mines in production in Canada, which IAMGOLD operates in a 70|30 partnership with Sumitomo Metal Mining Co. Ltd. In addition, the Company has an established portfolio of early stage and advanced exploration projects within high potential mining districts, including the large-scale Nelligan Mining Complex located in Quebec, Canada. IAMGOLD employs approximately 3,800 people and is committed to maintaining its culture of accountable mining through high standards of Environmental, Social and Governance practices. IAMGOLD is listed on the New York Stock Exchange (NYSE: IAG) and the Toronto Stock Exchange (TSX: IMG).

IAMGOLD Contact Information

Graeme Jennings, Vice President, Business Development & Investor Relations Tel: 416 360 4743 | Mobile: 416 388 6883 Toll-free: 1 888 464 9999 info@iamgold.com

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

All information included or incorporated by reference in this news release, including any information as to the Company's vision, strategy, future financial or operating performance and other statements that express management's expectations or estimates of future performance or impact, including statements in respect of the prospects and/or development of the Company's projects, other than statements of historical fact, constitutes forward-looking information or forward-looking statements within the meaning of applicable securities laws (collectively referred to herein as "forward-looking statements") and such forward-looking statements are based on expectations, estimates and projections as of the date of this news release. Forward-looking statements are generally identifiable by the use of words such as "may", "will", "should", "would", "could", "continue", "expect", "budget", "aim", "can", "focus", "forecast", "anticipate", "estimate", "maintain", "believe", "intend", "plan", "schedule", "guidance", "outlook", "potential", "seek", "targets", "cover", "strategy", "during", "ongoing", "subject to", "future", "objectives", "opportunities", "committed", "prospective", "likely", "progress", "strive", "sustain", "effort", "extend", "remain", "pursue", "predict", or "project" or the negative of these words or other variations on these words or comparable terminology.