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Iamgold Files Ni 43-101 Technical Report FOR Previously Announced Initial Mineral Resource Estimate FOR the Monster Lake Project

Resource Estimates Technical Reports (NI 43-101)

NEWS RELEASE

TSX: IMG NYSE: IAG

IAMGOLD FILES NI 43-101 TECHNICAL REPORT FOR PREVIOUSLY ANNOUNCED

INITIAL MINERAL RESOURCE ESTIMATE FOR THE MONSTER LAKE PROJECT

Toronto, Ontario, May 10, 2018 – IAMGOLD Corporation (“IAMGOLD” or the “Company”) announced

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

mineral resource estimate for the Monster Lake Project in Quebec, Canada, reported in the Company’s

news release dated March 28, 2018.

The NI 43-101 was prepared by Charlotte Athurion, P.Geo., and Karine Brousseau, P.Eng., both of

InnovExplo, under the supervision of Alain Carrier P.Geo., of InnovExplo. All are considered “Qualified

Persons” as defined by NI 43-101. 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 acquisition opportunities.

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

For further information please contact:

Ken Chernin, VP Investor Relations, IAMGOLD Corporation

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

Laura Young, Director Investor Relations, IAMGOLD Corporation

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

Martin Dumont, Senior Analyst Investor Relations, IAMGOLD Corporation

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

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