ANNUAL INFORMATION FORM FOR THE YEAR ENDED DECEMBER 31, 2020 Dated: February 17, 2021 401 Bay Street, Suite 3200 Toronto, ON M5H 2Y4 Table of Contents Item I Name and Incorporation................................................................................................................... 11 Item II General Development of the Business ........................................................................................... 12 1. Three-Year History ........................................................................................................................... 12 2. Other Disclosure Relating to Ontario Securities Commission Requirements for Companies Operating in Emerging Markets ........................................................................................................ 20 3. Risk Factors ...................................................................................................................................... 22 Item III Description of the Business ........................................................................................................... 50 1. Mining Activities - Canada ................................................................................................................ 50 1.1 Doyon Division - Westwood Mine ........................................................................................... 50 1.2 Côté Gold Project .................................................................................................................... 62 2. Mining Activities – International ........................................................................................................ 83 2.1 Africa: Burkina Faso – Essakane Mine ................................................................................... 83 2.2 Africa: Senegal - Boto Gold Project ...................................................................................... 108 2.3 South America: Suriname - Rosebel Mine and the Saramacca Project ............................... 129 3. Exploration and Development ........................................................................................................ 149 3.1 General .................................................................................................................................. 149 3.2 Near Mine and Brownfield Exploration and Development Projects ...................................... 152 3.3 Greenfield Exploration and Evaluation Projects .................................................................... 154 3.4 Outlook .................................................................................................................................. 157 4. Mineral Reserves and Mineral Resources ...................................................................................... 158 5. Other Aspects of the Business ....................................................................................................... 162 5.1 Marketing of Production ........................................................................................................ 162 5.2 Environment and Permitting .................................................................................................. 162 5.3 Community Relations ............................................................................................................ 164 5.4 Project Development and Construction ................................................................................ 165 5.5 Operations Services .............................................................................................................. 165 5.6 Intellectual Property .............................................................................................................. 165 5.7 Competition ........................................................................................................................... 165 5.8 Sale of Production ................................................................................................................. 166 5.9 Employees ............................................................................................................................. 166 6. Legal Proceedings and Regulatory Actions.................................................................................... 167 Item IV Description of Capital Structure ................................................................................................... 167 Item V Ratings .......................................................................................................................................... 168 Item VI Market for Securities .................................................................................................................... 170 1. Trading Price and Volume .............................................................................................................. 170 2. Prior Sales ...................................................................................................................................... 171 Item VII Directors and Officers ................................................................................................................. 172 1. Directors.......................................................................................................................................... 172 2. Executive Officers ........................................................................................................................... 173 3. Shareholdings of Directors and Officers ......................................................................................... 174 4. Corporate Cease Trade Orders or Bankruptcies ............................................................................ 174 Item VIII Audit and Finance Committee ................................................................................................... 175 1. Composition and Relevant Education and Experience of Members .............................................. 175 2. Audit and Finance Committee Mandate ......................................................................................... 177 3. Pre-Approval Policies and Procedures ........................................................................................... 178 4. External Auditor Service Fees ........................................................................................................ 178 Item IX Interest of Management and Others in Material Transactions .................................................... 179 Item X Transfer Agent and Registrar ....................................................................................................... 179 Item XI Material Contracts ........................................................................................................................ 179 Item XII Interests of Experts ..................................................................................................................... 183 Item XIII Additional Information ................................................................................................................ 183 Schedule A ................................................................................................................................................ 184 Audit and Finance Committee Mandate Iamgold Corporation .................................................................. 184 List of Charts and Tables IAMGOLD’s Corporate Structure ............................................................................................................. 12 Consolidated Mineral Reserves and Mineral Resources as of December 31, 2020 ......................... 158 - 1 - Explanatory Notes: 1. All dollar amounts presented in this Annual Information Form are expressed in U.S. dollars, unless otherwise indicated. 2. Production results are in metric units, unless otherwise indicated. 3. IAMGOLD Corporation carries on business in Canada. The subsidiaries of IAMGOLD Corporation carry on business in Canada and elsewhere. In this Annual Information Form, the words “Company” and “IAMGOLD” are used interchangeably and in each case refer, as the context may require, to all or any of IAMGOLD Corporation and its subsidiaries. 4. The information in this Annual Information Form is complemented by the Company’s Audited Consolidated Annual Financial Statements for the year ended December 31, 2020 and the related management’s discussion and analysis. 5. The Company’s Annual Financial Statements for the year ended December 31, 2020 and the related management’s discussion and analysis, are available on SEDAR at www.sedar.com and the Company’s website at www.iamgold.com. Our website and the information contained on our website is not part of or incorporated by reference into this Annual Information Form. Cautionary Note to U.S. Investors Regarding Disclosure of Mineral Reserve and Mineral Resource Estimates Disclosure regarding the Company’s mineral properties, including with respect to mineral reserve and mineral resource estimates included in this Annual Information Form, was prepared in accordance with Canadian National Instrument 43-101 — Standards of Disclosure for Mineral Projects (“NI 43-101”). NI 43-101 is a rule developed by the Canadian Securities Administrators (“CSA”) that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. NI 43-101 differs significantly from the disclosure requirements