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IMG.TO ·

Iamgold Successfully Closes Transaction with Sumitomo Metal Mining FOR the Development of Côté GOLD

Mergers & Acquisitions

NEWS RELEASE

TSX: IMG NYSE: IAG

IAMGOLD SUCCESSFULLY CLOSES TRANSACTION WITH SUMITOMO METAL MINING

FOR THE DEVELOPMENT OF CÔTÉ GOLD

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

Toronto, Ontario, June 20, 2017 – IAMGOLD Corporation (“IAMGOLD” or the “Company”) today

announced that it has completed the sale of 30% of its interest in the Côté Gold Project to a wholly-owned

subsidiary of Sumitomo Metal Mining Co., Ltd. (“Sumitomo”) for $195 million, as previously announced on

June 5, 2017.

On closing, IAMGOLD received $100 million in cash, with the remaining $95 million payable on the earlier

of 18 months following closing, or the date of public filing of a feasibility study with respect to the Côté Gold

Project. With the completion of this transaction, the Company’s liquidity now exceeds $1 billion.

“Closing a transaction that has unlocked the hidden value of Côté Gold is tremendously exciting,” said

Steve Letwin, President and CEO of IAMGOLD. “In Sumitomo, we have a partner with a common interest

in both advancing the development of Côté and in potentially pursuing future opportunities.”

In connection with the sale, IAMGOLD and Sumitomo have entered into a joint venture with respect to the

Côté Gold Project, IAMGOLD having 70% and Sumitomo having 30% of the total participating interests in

the joint venture.

Advisors

In connection with this transaction, RCI Capital Group acted as financial advisor and originator of the buy

side on behalf of IAMGOLD, Fasken Martineau acted as legal counsel to IAMGOLD, and DLA Piper

(Canada) acted as legal counsel to Sumitomo.

About Sumitomo Metal Mining Co., Ltd.

Sumitomo Metal Mining Co., Ltd. is a Japan based company with approximately $7.3 billion in revenue in

fiscal year ending March 31, 2017. The Company is primarily focused on the development and mining of

non-ferrous metals, and produces and markets copper, gold, nickel, and other precious metals. Sumitomo

Metal Mining is listed on the Tokyo Stock Exchange (5713).

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 oper ational expertise.

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 m ay

occur in the future (including, without limitation, statements regarding future opportunities, expected,

estimated or planned gold production, cash costs, margin expansion, capital expenditures and exploration

expenditures and statements regarding the estimation of mineral resources, exploration results, potential

mineralization, potential mineral resources and mineral reserves) are forward -looking statements.

Forward-looking statements are generally identifiable by use of the words "will", "should", "co ntinue",

"expect", "estimate", "believe", "plan" or "project" or the negative of these words or other variations on

these words or comparable terminology. Forward-looking statements are subject to a number of risks and

uncertainties, many of which are beyond the Company's ability to control or predict, that may cause the

actual results of the Company to differ materially from those discussed in the forward -looking

statements. Factors that could cause actual results or events to differ materially from curre nt expectations

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include, among other things, without limitation, failure to meet expected, estimated or planned gold

production, cash costs, margin expansion, capital expenditures and exploration expenditures and failure to

establish estimated mineral resources, the possibility that future exploration results will not be consistent

with the Company's expectations, changes in world gold markets and other risks disclosed in IAMGOLD's

most recent Form 40-F/Annual Information Form on file with the United States Securities and Exchange

Commission and Canadian provincial securities regulatory authorities. Any forward -looking statement

speaks only as of the date on which it is made and, except as may be required by applicable securities

laws, the Company disclaims any intent or obligation to update any forward-looking statement.

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

Shae Frosst, Investor Relations Associate, IAMGOLD Corporation

Tel: (416) 933-4738 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.