Iamgold Provides Update ON Drilling Results from the 2016 Exploration Program ON the Saramacca Project, Suriname

NEWS RELEASE

TSX: IMG NYSE: IAG

IAMGOLD PROVIDES UPDATE ON DRILLING RESULTS FROM THE 2016 EXPLORATION

PROGRAM ON THE SARAMACCA PROJECT, SURINAME

Toronto, Ontario, February 13, 2017 – IAMGOLD Corporation (“IAMGOLD” or the “Company”) today

provided an update from its initial exploration program at the Saramacca project located 25 kilometres

southwest of its Rosebel Gold Mine (“RGM’), in Suriname. The company is reporting final assay results

from the 2016 drilling program comprising approximately 14,600 metres from 67 diamond drill holes and

4,500 metres from 37 reverse circulation (”RC”) drill holes.

The assay results are provided in Table 1 and 2 below and include the following highlights:

(A drill hole plan map is attached to this news release.)

 SMDD16-002: 22.5 metres grading 2.79 g/t Au

13.5 metres grading 3.24 g/t Au

17.7 metres grading 2.51 g/t Au

18.0 metres grading 5.35 g/t Au

 SMDD16-012: 78.0 metres grading 3.98 g/t Au

 SMDD16-017: 24.0 metres grading 4.78 g/t Au

12.0 metres grading 2.75 g/t Au

 SMDD16-042: 55.5 metres grading 1.99 g/t Au

13.5 metres grading 2.80 g/t Au

46.5 metres grading 5.22 g/t Au

 SMDD16-053: 101.0 metres grading 4.31 g/t Au

“The potential of the Saramacca property and the neighbouring Sarafina property will leverage off of our

existing infrastructure and represent an excellent brownfield opportunity with greenfield excitement,” said

Steve Letwin, President and Chief Executive Officer for IAMGOLD. “I’m very proud of what the Rosebel

team has done to reinvent their mine through cost reductions and performa nce improvements. Their hard

work has extended the mine life well beyond our previous expectations and has given them the time to

acquire access to and explore the potential of properties such as Saramacca. The encouraging results

from the 2016 drill program at Saramacca indicate that this property has the potential to be transformative

for the future of Rosebel and very beneficial to all our stakeholders, including our partner the Government

of Suriname, just as we envisaged when we bought this property.”

Craig MacDougall, Senior Vice President, Exploration for IAMGOLD, stated: “ First I want to recognize the

efforts of our exploration team to advance the Saramacca project so quickly since its acquisition. The

assay results from the 2016 drilling program are encouraging and appear to confirm the presence of

significant mineralization. It is particularly pleasing to note the amount of mineralized intersections in ‘soft’

saprolite extending to depths of up to 100 metres. With continued success, we expect our 2017 infill drilling

program to ultimately lead to the estimation of an initial resource for this project, which would mark a

significant milestone for our exploration program at Rosebel.”

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2016 Exploration Program

The Saramacca project is strategically located approximately 25 kilometers southwest of the Rosebel Gold

Mine milling facility. Mineralization is hosted in the Paramaka Formation within the lower part of the

Marowijne Greenstone Belt, which is dominated by metamorphosed dacite, rhyolite, basalt and andesite

lithologies in the project area. These are traversed by the regional, northwest trending Saramacca shear

zone, an important deformation zone for the localization of gold mineralization.

The 2016 drilling program was designed to duplicate a number of historic mineralized drilling intersections

obtained by previous explorers as well as test the full strike and width of the interpreted mineralized

footprint on a nominal 100 x 50 metre drill hole spacing. Duplicate holes successfully confirmed previous

exploration results. As well, many holes intersected mineralization hosted in soft saprolite to depths from

surface ranging between 50 to 100 metres. The program has confirmed the presence of multiple

mineralized structures within an approximately 2 kilometres long and 600 metres wide corridor.

Mineralization remains open along strike and at depth.

Three mineralization types are recognized from the drilling to date: breccia hosted mineralization

characterized by jigsaw, crackle and matrix supported breccias; shear hosted mineralization characterized

by well-developed pyritic disseminations and stringers; and irregular pyrite-quartz-carbonate veins which

locally carry high gold grades.

Next Steps

The 2017 exploration program has commenced, with 2 diamond drill rigs currently operating. A phase I

drilling program comprised of approximately 15,000 metres of diamond drilling will focus on completing a

50 x 50 metre infill drilling pattern to further define and confirm continuity of the key mineralized structures.

Results will be incorporated into a deposit model to support an initial NI 43-101 compliant resource

estimate expected for completion by the third quarter 2017.

In addition, geological mapping and geophysical surveys will commence along the Saramacca structural

corridor to define further targets for drill testing.

About the Saramacca Project

The Saramacca property has been explored since the 1990’s principally by Golden Star and later as a joint

venture between Golden Star Resources Ltd. (“Golden Star”) and Newmont Mining Corporation. Much of

that work focused on the discovery and delineation of Anomaly M, which was the subject of successive

auger and diamond drilling programs with over 50 diamond drill holes and over 200 auger holes completed

in the anomaly area. Evaluation of this work suggests an exploration target potential of between 8 and 40

million tonnes grading between 1.0 and 1.8 g/t Au for potentially 0.5 to 1.4 million contained ounces of

gold. The potential quantity and grade are conceptual in nature and insufficient exploration work has been

completed to date to define a mineral resource. The property will require significant future exploration to

advance to a resource stage and there can be no certainty that the exploration target will result in a

mineral resource being defined.

On August 30, 2016, the Company signed a letter of intent with the Government of Suriname to acquire

rights to the Saramacca property, with the intent of defining a National Instrument 43-101 compliant

mineral resource within 24 months. The terms of the letter included an initial payment of $0.2 million, which

enabled immediate access to the property for Rosebel’s exploration team to conduct due diligence, as well

as access to the data from previous exploration activity at the Saramacca property. On September 30,

2016, having been satisfied with the results of the due diligence, the Company ratified the letter of intent to

acquire the Saramacca property and subsequently paid $10 million in cash and agreed to issue 3.125

million IAMGOLD common shares to the Government of Suriname in three approximately equal annual

instalments on each successive anniversary of the date the right of exploration was transferred to Rosebel

(December 14, 2016). In addition, the agreement provides for a potential upward adjustment to the

purchase price based on the contained gold ounces identified by Rosebel in National Instrument 43-101

measured and indicated resource categories , within a certain Whittle shell over the first 24 months, to a

maximum of $10 million.

The Saramacca project falls within the “UJV” area as defined in an Agreement with the Government of

Suriname announced on April 15, 2013. The Agreement establishes a joint venture growth vehicle under

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which Rosebel would hold a 70% participating interest and the Government will acquire a 30%

participating interest on a fully-paid basis.

Qualified Persons and Technical Information

The drilling results contained in this news release have been prepared in accordance with National

Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101").

The "Qualified Person" responsible for the supervision of the preparation , verification and review of the

technical information in this release is Ian Stockton, MAusIMM, MAIG, Exploration Manager for IAMGOLD

in Suriname. He is considered a "Qualified Person" for the purposes of National Instrument 43 -101 with

respect to the technical information being reported on. The technical information has been included herein

with the consent and prior review of the above noted Qualified Person.

The information in this news release was reviewed and approved by Craig MacDougall, P.Geo., Senior

Vice President, Exploration for IAMGOLD. Mr. MacDougall is a Qualified Person as defined by National

Instrument 43-101.

The sampling of, and assay data from, drill core is monitored through the implementation of a quality

assurance - quality control (QA-QC) program designed to follow industry best practice. Drill core (HQ and

NQ size) samples are selected by the IAMGOLD geologists and sawn in half wi th a diamond saw at the

Rosebel mine site. Half of the core is retained at the site for reference purposes. Sample intervals may

vary from half a metre to one and a half metres in length depending on the geological observations.

Reverse circulation samples (RC) are passed through a rotary splitter and collected in 1 metre intervals

and combined to form 2 metre assay intervals, (except wet samples which are sampled without the splitter)

for submission of a 4 - 5 kilogram sample to the assay lab. The 1 metre samples are maintained for future

reference and a reference sample is collected and stored in a chip tray. QA-QC is carried out as per

above.

Samples are transported in sealed bags to FILAB in Paramaribo, Suriname, a representative lab of ALS.

FILAB is an ISO 9001 (2008) and ISO/IEC 170250 accredited laboratory. Samples are weighed and

coarse crushed to <2.5 mm, and 350-450grams is Pulverized to 85% passing<100 μm. Samples are

analyzed for gold using standard fire assay technique with a 50 gram charge and an Atomic Absorption

(AA) finish. Multi-element analysis (40 elements) using ICPAES multi-acid digest is also undertaken.

IAMGOLD inserts blanks and certified reference standard in the sample sequence for quality control.

Samples representative of the various lithologies are collected from each drill hole and measured for bulk

density at the site RGM laboratory.

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 may

occur in the future (including, without limitation, statements regarding 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”, “continue”, “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 current expectations 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 IAMG OLD’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

page 4 of 9

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.

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.

For further information please contact:

Bob Tait, VP Investor Relations, IAMGOLD Corporation

Tel: (416) 360-4743 Mobile: (647) 403-5520

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.

page 5 of 9

Table 1 – Diamond drill hole assays

HOLE-ID

Local UTM grid End of

Hole (m) Az Dip From (m) To (m) Interval

(m) Au (g/t) Easting Northing Elevation

SMDD16-001 31845 64556 704 73 215 -45 0.0 10.5 10.5 2.76

SMDD16-002 32058 64365 733 300 215 -50 3.0 25.5 22.5 2.79

76.5 90.0 13.5 3.24

96.0 106.5 10.5 1.23

177.0 194.7 17.7 2.51

208.5 226.5 18.0 5.35

232.5 243.0 10.5 1.06

SMDD16-003 32127 64279 737 153 215 -50 88.5 117.5 29.0 2.35

SMDD16-004 32068 64202 777 179 215 -50 No significant results

SMDD16-005 31991 64425 736 120 214 -51 42.0 52.5 10.5 2.20

SMDD16-006 32114 64262 743 126 215 -45 43.5 50.0 6.5 0.42

SMDD16-007 32058 64182 787 158 215 -45 1.2 9.0 7.8 0.95

SMDD16-008 31852 64607 695 185 215 -50 0.8 21.0 20.3 1.53

157.5 167.6 10.1 6.50

SMDD16-009 32184 64242 741 197 215 -53 84.0 96.9 12.9 2.59

157.5 163.0 5.5 1.27

SMDD16-010 32245 64075 798 213 215 -50 93.0 99.0 6.0 0.76

159.0 168.0 9.0 2.61

SMDD16-011 32002 64297 745 180 215 -50 3.0 11.5 8.5 5.35

31.5 64.5 33.0 2.22

76.5 94.5 18.0 5.44

SMDD16-012 31911 64503 723 162 215 -50 0.0 18.0 18.0 0.49

34.5 112.5 78.0 3.98

SMDD16-013 32578 63584 899 102 215 -50 0.0 21.0 21.0 3.19

30.0 54.0 24.0 0.85

SMDD16-014 31978 64251 766 132 215 -50 No significant results

SMDD16-015 32579 63651 886 239 215 -50 3.0 9.0 6.0 0.54

109.5 120.0 10.5 0.63

136.5 148.5 12.0 2.94

191.2 204.0 12.8 1.60

SMDD16-016 32739 63380 893 171 212 -52 0.0 7.3 7.3 2.48

120.0 139.5 19.5 3.12

SMDD16-017 32781 63273 913 221 215 -50 25.5 49.5 24.0 4.78

57.0 69.0 12.0 2.75

76.5 84.0 7.5 0.41

90.0 96.0 6.0 0.76

103.5 121.5 18.0 1.51

SMDD16-018 32023 64655 688 180 215 -50 No significant results

SMDD16-019 32524 63669 869 181 215 -50 52.5 64.0 11.5 1.69

115.5 133.5 18.0 6.14

SMDD16-020 31977 64596 704 216 215 -50 193.2 198.5 5.3 3.36

SMDD16-021 32347 63877 853 178 215 -45 18.0 27.0 9.0 1.70

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HOLE-ID

Local UTM grid End of

Hole (m) Az Dip From (m) To (m) Interval

(m) Au (g/t) Easting Northing Elevation

SMDD16-022 32953 63343 883 107 215 -50 23.3 31.5 8.2 1.14

SMDD16-023 32290 63994 821 140 35 -55 64.5 82.5 18.0 1.87

SMDD16-024 32897 63306 893 200 215 -50 No significant results

SMDD16-025 32146 64150 788 302 215 -50 No significant results

SMDD16-026 31951 64550 713 279 215 -50 57.0 66.0 9.0 0.95

81.0 93.0 12.0 0.85

183.0 192.0 9.0 2.09

213.0 221.0 8.0 0.78

SMDD16-027 32980 63251 894 195 215 -50 49.5 61.7 12.2 4.52

117.0 136.5 19.5 1.00

SMDD16-028 32245 64112 787 235 215 -50 120.0 126.0 6.0 0.66

198.0 207.0 9.0 1.46

SMDD16-029 32972 63401 865 204 215 -50 No significant results

SMDD16-030 32308 64179 746 128 215 -51 No significant results

SMDD16-031 31962 64408 742 182 215 -50 0.0 12.3 12.3 2.07

27.0 34.5 7.5 0.90

SMDD16-032 32845 63223 908 257 215 -50 10.5 37.5 27.0 1.74

132.0 141.0 9.0 2.94

162.0 168.0 6.0 3.55

SMDD16-033 32177 64181 768 278 215 -47 46.7 55.5 8.8 5.95

69.5 80.0 10.5 0.74

SMDD16-034 32117 64094 818 370 215 -47 1.5 17.0 15.5 3.16

SMDD16-035 32004 64464 726 278 215 -50 No significant results

SMDD16-036 32960 63210 897 171 215 -50 No significant results

SMDD16-037 32195 64042 818 231 215 -50 78.0 85.5 7.5 3.58

SMDD16-038 32240 64274 722 336 215 -50 18.0 27.0 9.0 3.41

36.0 43.5 7.5 0.84

220.5 228.0 7.5 1.99

SMDD16-039 32911 63154 900 321 215 -50 167.3 180.0 12.7 3.63

246.0 262.5 16.5 0.48

SMDD16-040 32342 63912 847 189 215 -50 132.0 139.5 7.5 2.78

SMDD16-041 31817 64529 707 144 215 -50 0.0 19.5 19.5 1.15

SMDD16-042 32079 64397 731 395 215 -52 0.0 55.5 55.5 1.99

197.0 210.5 13.5 2.80

216.5 263.0 46.5 5.22

SMDD16-043 31881 64631 691 267 215 -50 1.5 13.5 12.0 1.27

SMDD16-044 32449 63890 843 131 215 -50 No significant results

SMDD16-045 32734 63238 917 155 215 -50 1.5 18.0 16.5 2.76

SMDD16-046 31890 64469 729 152 215 -50 No significant results

SMDD16-047 32411 63988 804 347 215 -50 130.5 138.0 7.5 8.05

SMDD16-048 32369 63951 824 267 215 -50 No significant results

SMDD16-049 31929 64361 752 173 215 -50 No significant results

SMDD16-050 32308 64032 807 320 215 -50 No significant results

SMDD16-051 32053 64534 711 375 215 -50 295.5 306.0 10.5 1.38

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HOLE-ID

Local UTM grid End of

Hole (m) Az Dip From (m) To (m) Interval

(m) Au (g/t) Easting Northing Elevation

344.0 357.5 13.5 0.63

SMDD16-052 32732 63241 917 192 215 -50 9.0 19.5 10.5 1.41

SMDD16-053 32338 64062 800 176 215 -50 10.5 111.5 101.0 4.31

SMDD16-054 32399 63806 870 186 215 -50 50.0 61.5 11.5 2.21

72.0 94.5 22.5 6.08

SMDD16-055 32353 64075 792 322 215 -50 141.3 154.5 13.2 2.82

173.8 181.3 7.5 3.17

SMDD16-056 32804 63338 903 295 215 -50 0.0 34.5 34.5 0.85

151.5 175.5 24.0 4.51

SMDD16-057 32129 64469 723 154 215 -50 No significant results

SMDD16-058 32371 63764 884 164 215 -50 No significant results

SMDD16-059 31652 64671 645 215 215 -50 No significant results

SMDD16-060 32149 64326 721 348 35 -51 1.5 24.0 22.5 0.57

123.0 132.5 9.5 1.34

138.5 144.5 6.0 0.52

193.5 199.3 5.8 0.76

SMDD16-061 32349 63546 900 351 215 -50 250.5 256.5 6.0 0.50

SMDD16-062 31697 64716 662 326 215 -50 33.0 40.5 7.5 0.46

SMDD16-063 32622 63438 901 225 215 -50 No significant results

SMDD16-064 31723 64756 656 239 215 -50 112.5 123.5 11.0 7.76

SMDD16-065 32095 64231 760 246 215 -50 No significant results

SMDD16-066 31762 64811 645 239 215 -50 No significant results

SMDD16-067 32552 63496 898 155 215 -50 No significant results

Notes:

1. Drill hole intercepts are calculated using a 0.50 g/t Au assay cut-off and 5m minimum length

2. Assays are reported uncut

3. True widths are unknown at this stage

page 8 of 9

Table 2 – Reverse circulation (RC) drill hole assays

HOLE-ID Local UTM grid End of

Hole (m) Az Dip From

(m) To (m) Interval

(m)

Au

(g/t) Easting Northing Elevation

SMRC16-001 32210 64420 715 102 215 -50 26.00 30.00 4.00 1.45

SMRC16-002 32295 64326 710 66 215 -50 No significant results

SMRC16-003 32341 64253 721 130 215 -50 No significant results

SMRC16-004 32058 64025 853 130 215 -50 No significant results

SMRC16-005 31998 64099 828 120 215 -50 No significant results

SMRC16-006 32236 63931 849 120 215 -50 No significant results

SMRC16-007 32469 63563 869 120 215 -50 No significant results

SMRC16-008 32553 63494 898 148 215 -50 100.00 128.00 28.00 9.60

SMRC16-009 32568 63369 916 120 215 -50 No significant results

SMRC16-010 32638 63292 917 32 215 -50 No significant results

SMRC16-011 32650 63288 916 120 215 -50 No significant results

SMRC16-012 33056 63364 869 150 215 -50 No significant results

SMRC16-013 33010 63438 858 102 215 -50 No significant results

SMRC16-014 32875 63455 869 130 215 -50 - 10.00 10.00 2.65

108.00 112.00 4.00 5.05

SMRC16-015 32917 63511 856 120 215 -50 No significant results

SMRC16-016 32813 63546 861 120 215 -50 18.00 28.00 10.00 2.67

SMRC16-017 32849 63582 853 108 215 -50 No significant results

SMRC16-018 32733 63589 877 150 215 -50 - 8.00 8.00 1.21

SMRC16-019 32663 63672 877 120 215 -50 No significant results

SMRC16-020 32774 63637 864 150 215 -50 42.00 50.00 8.00 2.26

84.00 92.00 8.00 1.63

SMRC16-021 32703 63726 862 120 215 -50 No significant results

SMRC16-022 32591 63729 863 132 215 -50 No significant results

SMRC16-023 32642 63779 850 130 215 -50 No significant results

SMRC16-024 32532 63827 862 120 215 -49 No significant results

SMRC16-025 32579 63890 847 120 215 -50 No significant results

SMRC16-026 32479 63929 830 120 215 -50 No significant results

SMRC16-027 32523 63968 825 120 215 -50 No significant results

SMRC16-028 32472 64081 783 130 215 -50 No significant results

SMRC16-029 32456 64028 800 132 215 -50 30.00 34.00 4.00 2.69

SMRC16-030 32439 64192 747 130 215 -50 No significant results

SMRC16-031 32387 64148 756 130 215 -50 No significant results

SMRC16-032 31976 65125 566 120 215 -50 No significant results

SMRC16-033 31961 65069 568 120 215 -50 No significant results

SMRC16-034 31888 64998 595 130 215 -50 2.00 6.00 4.00 0.61

SMRC16-035 31852 64929 619 130 215 -50 No significant results

SMRC16-036 32056 64702 674 150 215 -50 - 8.00 8.00 0.95

SMRC16-037 31908 64671 673 114 215 -50 108.00 112.00 4.00 1.02

Notes:

1. Drill hole intercepts are calculated using a 0.50 g/t Au assay cut-off and 4m minimum length

2. Assays are reported uncut

3. True widths are unknown at this stage