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Iamgold Files Ni 43-101 Technical Report FOR Previously Announced Pre-Feasibility Study FOR the Boto GOLD Project

Resource Estimates Technical Reports (NI 43-101) Economic Studies

IAMGOLD FILES NI 43-101 TECHNICAL REPORT FOR PREVIOUSLY

ANNOUNCED PRE-FEASIBILITY STUDY FOR THE BOTO GOLD PROJECT

Toronto, Ontario, February 21, 2018 – IAMGOLD Corporation (“IAMGOLD” or the “Company”)

announced today the Company has filed a National Instrument 43-101 (NI 43-101”) Technical Report on

the pre-feasibility (“PFS”) Study for the Boto Gold Project in Senegal, West Africa, reported in the

Company’s news release dated February 12, 2018.

The PFS was completed jointly by IAMGOLD and Lycopodium Minerals Canada Ltd., with inputs from

technical studies completed by other consultants and has an effective date of December 31, 201 7.

The NI 43-101 Technical Report may be found on the Company's website at www.iamgold.com or under

the Company's profile at www.sedar.com and www.sec.gov/edgar.shtml.

About IAMGOLD

IAMGOLD (www.iamgold.com) is a mid-tier mining company with four operating gold mines on three

continents. A solid base of strategic assets in North and South America and West Africa is complemented

by development and exploration projects and continued assessment of accretive acquisi tion

opportunities. IAMGOLD is in a strong financial position with extensive management and operational

expertise.

For further information please contact:

Ken Chernin, VP Investor Relations

Tel: (416) 360-4743 Mobile: (416) 388-6883

Laura Young, Director Investor Relations

Tel: (416) 933-4952 Mobile: (416) 670-3815

Martin Dumont, Senior Analyst Investor Relations

Tel: (416) 933-5783 Mobile: (647) 967-9942

IAMGOLD Corporation Toll-free: 1 888 464-9999 [email protected]

Please note:

This entire news release may be accessed via fax, e -mail, IAMGOLD's website at www.iamgold.com and through CNW Group’s

website at www.newswire.ca. All material information on IAMGOLD can be found at www.sedar.com or at www.sec.gov.

Si vous désirez obtenir la version française de ce communiqué, veuillez consulter le

http://www.iamgold.com/French/accueil/default.aspx

TSX: IMG NYSE: IAG

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