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reserves-and-resource-summary

2017 Mineral Reserves and Resources

Mineral resources (“resources”) and mineral reserves (“reserves”) have been estimated as at December 31, 2017 pursuant to Canadian securities regulatory requirements, specifically the requirements of National Instrument 43-101 and the definitions of resources and reserves incorporated therein. Consistent with National Instrument 43-101, resources are divided into “inferred,” “indicated” and “measured” based on the level of geological confidence in the mineralization, and reserves, into “probable” and “proven” upon at least a pre-feasibility study having been undertaken on the indicated and measured resources. Measured and indicated resources are inclusive of proven and probable reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability and are not guaranteed to have economic viability. Inferred resources are too speculative geologically to have any economic considerations applied to them that would allow a translation into reserves.

Cautionary Notes to U.S. Investors

The United States Securities and Exchange Commission (“SEC”) limits disclosure for U.S. reporting purposes to mineral deposits that a company can economically and legally extract or produce. IAMGOLD uses certain terms in the Annual Report, such as “measured,” “indicated,” or “inferred,” which may not be consistent with the reserve definitions established by the SEC. U.S. investors are urged to consider closely the disclosure in the IAMGOLD Annual Reports on Forms 40-F filed with the SEC.

Gold Mineral Reserves1

100% BASIS



PROVEN PROBABLE
As at December 31, 2017 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel 23,122 0.6 479 84,358 1.1 3,034
Essakane - - - 93,126 1.1 3,390
Westwood 998 7.9 252 3,770 7.6 924
Sadiola 245 2.1 17 69,106 1.9 4,124
Côté Gold - - - 196,079 0.9 5,926
Boto Gold - - - 26,841 1.6 1,415
Total proven reserves


24,365 1.0 748
Total probable reserves


473,280 1.2 18,813
Total proven and probable reserves


497,646 1.2 19,560

As at December 31, 2017: Proven

Rosebel
Tonnes (000): 23,122
Grade (g/t): 0.6
Contained Ounces (000): 479

Essakane
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Westwood
Tonnes (000): 998
Grade (g/t): 7.9
Contained Ounces (000): 252

Sadiola
Tonnes (000): 245
Grade (g/t): 2.1
Contained Ounces (000): 17

Côté Gold
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Boto Gold
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2017: Probable

Rosebel
Tonnes (000): 84,358
Grade (g/t): 1.1
Attributable Contained Ounces (000): 3,034

Essakane
Tonnes (000): 93,126
Grade (g/t): 1.1
Attributable Contained Ounces (000): 3,390

Westwood
Tonnes (000): 3,770
Grade (g/t): 7.6
Attributable Contained Ounces (000): 924

Sadiola
Tonnes (000): 69,106
Grade (g/t): 1.9
Attributable Contained Ounces (000): 4,124

Côté Gold
Tonnes (000): 196,079
Grade (g/t): 0.9
Attributable Contained Ounces (000): 5,926

Boto Gold
Tonnes (000): 26,841
Grade (g/t): 1.6
Attributable Contained Ounces (000): 1,415

Total proven reserves
Tonnes (000): 24,365
Grade (g/t): 1.0
Attributable Contained Ounces (000): 748

Total probable reserves
Tonnes (000): 473,280
Grade (g/t): 1.2
Attributable Contained Ounces (000): 18,813

Total proven and probable reserves
Tonnes (000): 497,646
Grade (g/t): 1.2
Attributable Contained Ounces (000): 19,560

Attributable Reserves


PROVEN PROBABLE
As at December 31, 2017 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel (95%) 21,966 0.6 455 80,140 1.1 2,882
Essakane (90%) - - - 83,813 1.1 3,051
Westwood (100%) 998 7.9 252 3,770 7.6 924
Sadiola (41%) 101 2.1 7 28,334 1.9 1,691
Côté Gold (64.75%) - - - 126,961 0.9 3,837
Boto Gold (100%) - - - 26,841 1.6 1,415
Total proven reserves


23,065 1.0 714
Total probable reserves


349,859 1.2 13,800
Total proven and probable reserves


372,924 1.2 14,514

As at December 31, 2017: Proven

Rosebel (95%)
Tonnes (000): 21,966
Grade (g/t): 0.6
Contained Ounces (000): 455

Essakane (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Westwood (100%)
Tonnes (000): 998
Grade (g/t): 7.9
Contained Ounces (000): 252

Sadiola (41%)
Tonnes (000): 101
Grade (g/t): 2.1
Contained Ounces (000): 7

Côté Gold (64.75%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Boto Gold (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2017: Probable

Rosebel (100%)
Tonnes (000): 80,140
Grade (g/t): 1.1
Contained Ounces (000): 2,882

Essakane (90%)
Tonnes (000): 83,813
Grade (g/t): 1.1
Contained Ounces (000): 3,051

Westwood (100%)
Tonnes (000): 3,770
Grade (g/t): 7.6
Contained Ounces (000): 924

Sadiola (41%)
Tonnes (000): 28,334
Grade (g/t): 1.9
Contained Ounces (000): 1,691

Côté Gold (64.75%)
Tonnes (000): 126,961
Grade (g/t): 0.9
Contained Ounces (000): 3,837

Boto Gold (100%)
Tonnes (000): 26,841
Grade (g/t): 1.6
Contained Ounces (000): 1,415

Total proven reserves
Tonnes (000): 23,065
Grade (g/t): 1.0
Contained Ounces (000): 714

Total probable reserves
Tonnes (000): 349,859
Grade (g/t): 1.2
Contained Ounces (000): 13,800

Total proven and probable reserves
Tonnes (000): 372,924
Grade (g/t): 1.2
Contained Ounces (000): 14,514

* Mineral reserve tonnage, grade and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding.

Gold Mineral Resources2

(Inclusive of Mineral Reserves)
100% BASIS



MEASURED INDICATED INFERRED
As at December 31, 2017 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Rosebel
45,561 0.7 1,059 254,010 1.0 8,036 86,471 1.0 2,704
Essakane - - - 113,809 1.2 4,269 9,720 1.2 386
Westwood 788 13.2 335 2,808 11.9 1,078 5,189 11.0 1,838
Sadiola 245 2.1 17 122,451 1.8 7,040 17,661 1.7 956
Côté Gold - - - 281,171 0.9 8,037 76,471 0.5 1,231
Saramacca - - - 14,444 2.2 1,022 13,362 1.2 518
Boto Gold - - - 37,408 1.6 1,922 10,981 1.7 593
Diakha-Siribaya - - - 2,102 1.9 129 19,816 1.7 1,092
Pitangui - - - - - - 5,365 4.7 819
Total measured resources





46,594 0.9 1,411
Total indicated resources





828,203 1.2 31,533
Total measured and indicated resources3,4





874,798 1.2 32,944
Total inferred resources





245,306 1.3 10,138

As at December 31, 2017: Measured

Rosebel
Tonnes (000): 45,561
Grade (g/t): 0.7
Contained Ounces (000): 1,059

Essakane
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Westwood
Tonnes (000): 788
Grade (g/t): 13.2
Contained Ounces (000): 335

Sadiola
Tonnes (000): 245
Grade (g/t): 2.1
Contained Ounces (000): 17

Côté Gold
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Saramacca
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Boto Gold
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Diakha-Siribaya
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Pitangui
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2017: Indicated

Rosebel
Tonnes (000): 254,010
Grade (g/t): 1.0
Contained Ounces (000): 8,036

Essakane
Tonnes (000): 113,809
Grade (g/t): 1.2
Contained Ounces (000): 4,269

Westwood
Tonnes (000): 2,808
Grade (g/t): 11.9
Contained Ounces (000): 1,078

Sadiola
Tonnes (000): 122,451
Grade (g/t): 1.8
Contained Ounces (000): 7,040

Côté Gold
Tonnes (000): 281,171
Grade (g/t): 0.9
Contained Ounces (000): 8,037

Saramacca
Tonnes (000): 14,444
Grade (g/t): 2.2
Contained Ounces (000): 1,022

Boto Gold
Tonnes (000): 37,408
Grade (g/t): 1.6
Contained Ounces (000): 1,922

Diakha-Siribaya
Tonnes (000): 2,102
Grade (g/t): 1.9
Contained Ounces (000): 129

Pitangui
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2017: Inferred

Rosebel
Tonnes (000): 86,471
Grade (g/t): 1.0
Contained Ounces (000): 2,704

Essakane
Tonnes (000): 9,720
Grade (g/t): 1.2
Contained Ounces (000): 386

Westwood
Tonnes (000): 5,189
Grade (g/t): 11.0
Contained Ounces (000): 1,838

Sadiola
Tonnes (000): 17,661
Grade (g/t): 1.7
Contained Ounces (000): 956

Côté Gold
Tonnes (000): 76,471
Grade (g/t): 0.5
Contained Ounces (000): 1,231

Saramacca
Tonnes (000): 13,632
Grade (g/t): 1.2
Contained Ounces (000): 518

Boto Gold
Tonnes (000): 10,981
Grade (g/t): 1.7
Contained Ounces (000): 594

Diakha-Siribaya
Tonnes (000): 19,816
Grade (g/t): 1.7
Contained Ounces (000): 1,092

Pitangui
Tonnes (000): 5,365
Grade (g/t): 4.7
Contained Ounces (000): 819

Total measured resources
Tonnes (000): 46,594
Grade (g/t): 0.9
Contained Ounces (000): 1,411

Total indicated resources
Tonnes (000): 828,203
Grade (g/t): 1.2
Contained Ounces (000): 31,533

Total measured and indicated resources3,4
Tonnes (000): 874,798
Grade (g/t): 1.2
Contained Ounces (000): 32,944

Total inferred resources
Tonnes (000): 245,306
Grade (g/t): 1.3
Contained Ounces (000): 10,138

Attributable Resources


MEASURED INDICATED INFERRED
As at December 31, 2017 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Rosebel (95%) 43,283 0.7 1,006 241,310 1.0 7,634 82,147 1.0 2,569
Essakane (90%) - - - 102,428 1.2 3,842 8,748 1.2 348
Westwood (100%) 788 13.2 335 2,808 11.9 1,078 5,189 11.0 1,838
Sadiola (41%) 101 2.1 7 50,205 1.8 2,887 7,241 1.7 392
Côté Gold (64.75%) - - - 182,058 0.9 5,204 49,515 0.5 797
Saramacca (66.5%) - - - 9,605 2.2 680 9.065 1.2 344
Boto Gold (100%) - - - 37,408 1.6 1,922 10,981 1.7 594
Diakha-Siribaya (100%) - - - 2,102 1.9 129 19,816 1.7 1,092
Pitangui (100%) - - - - - - 5,365 4.7 819
Total measured resources





44,172 0.9 1,348
Total indicated resources





627,924 1.2 23,375
Total measured and indicated resources3,4





672,096 1.1 24,723
Total inferred resources





198,067 1.4 8,793

As at December 31, 2017: Measured

Rosebel (95%)
Tonnes (000): 43,283
Grade (g/t): 0.7
Contained Ounces (000): 1,006

Essakane (90%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Westwood (100%)
Tonnes (000): 788
Grade (g/t): 13.2
Contained Ounces (000): 335

Sadiola (41%)
Tonnes (000): 101
Grade (g/t): 2.1
Contained Ounces (000): 7

Côté Gold (64.75%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Saramacca (66.5%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Boto Gold (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Diakha-Siribaya (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Pitangui (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2017: Indicated

Rosebel (95%)
Tonnes (000): 241,310
Grade (g/t): 1.0
Contained Ounces (000): 7,634

Essakane (90%)
Tonnes (000): 102,428
Grade (g/t): 1.2
Contained Ounces (000): 3,842

Westwood (100%)
Tonnes (000): 2,808
Grade (g/t): 11.9
Contained Ounces (000): 1,078

Sadiola (41%)
Tonnes (000): 50,205
Grade (g/t): 1.8
Contained Ounces (000): 2,887

Côté Gold (92.5%)
Tonnes (000): 182,058
Grade (g/t): 0.9
Contained Ounces (000): 5,204

Saramacca (66.5%)
Tonnes (000): 9,605
Grade (g/t): 2.2
Contained Ounces (000): 680

Boto Gold (100%)
Tonnes (000): 37,408
Grade (g/t): 1.6
Contained Ounces (000): 1,922

Diakha-Siribaya (100%)
Tonnes (000): 2,102
Grade (g/t): 1.9
Contained Ounces (000): 129

Pitangui (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2017: Inferred

Rosebel (95%)
Tonnes (000): 82,147
Grade (g/t): 1.0
Contained Ounces (000): 2,569

Essakane (90%)
Tonnes (000): 8,748
Grade (g/t): 1.2
Contained Ounces (000): 348

Westwood (100%)
Tonnes (000): 5,189
Grade (g/t): 11.0
Contained Ounces (000): 1,838

Sadiola (41%)
Tonnes (000): 7,241
Grade (g/t): 1.7
Contained Ounces (000): 392

Côté Gold (64.75%)
Tonnes (000): 49,515
Grade (g/t): 0.5
Contained Ounces (000): 797

Saramacca (66.5%)
Tonnes (000): 9,065
Grade (g/t): 1.2
Contained Ounces (000): 344

Boto Gold (100%)
Tonnes (000): 10,981
Grade (g/t): 1.7
Contained Ounces (000): 594

Diakha-Siribaya (100%)
Tonnes (000): 19,816
Grade (g/t): 1.7
Contained Ounces (000): 1,092

Pitangui (100%)
Tonnes (000): 5,365
Grade (g/t): 4.7
Contained Ounces (000): 819

Total measured resources
Tonnes (000): 44,172
Grade (g/t): 0.9
Contained Ounces (000): 1,348

Total indicated resources
Tonnes (000): 627,924
Grade (g/t): 1.2
Contained Ounces (000): 23,375

Total measured and indicated resources 3,4
Tonnes (000): 672,096
Grade (g/t): 1.1
Contained Ounces (000): 24,723

Total inferred resources
Tonnes (000): 198,067
Grade (g/t): 1.4
Contained Ounces (000): 8,793

1 Mineral reserves have been estimated at December 31, 2017 using a gold price of $1,200 per ounce for Essakane, Rosebel, Westwood, Sadiola, Côté Gold Project and Boto Gold Project.

2 Mineral resources have been estimated at December 31, 2017, using a gold price of $1,500 per ounce for Essakane, Rosebel, Côté Gold, Boto Gold, Saramacca, Siribaya, and Pitangui, $1,400 per ounce for Sadiola, and $1,200 per ounce using a 6.0 g/t Au cut-off over a minimum width of 2 metres for Westwood.

3 In mining operations, measured and indicated resources that are not mineral reserves are considered uneconomic at the price used for reserve estimations but are deemed to have a reasonable prospect of economic extraction.

4 Measured and indicated gold resources are inclusive of proven and probable reserves.

* Mineral resource tonnage, grade and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding.

Gold Technical Information and Qualified Person/Quality Control Notes

The mineral resource estimates contained in this report 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 and review of all resource and reserve estimates for IAMGOLD is Lise Chénard, Eng., Director, Mining Geology. Lise has worked in the mining industry for more than 30 years, mainly in operations, project development and consulting.

She joined IAMGOLD in April 2013 and acquired her knowledge of the Company’s operations and projects through site visits, information reviews and ongoing communication and oversight of mine site technical service teams or consultants responsible for resource and reserve modeling and estimation.

She is considered a “Qualified Person” for the purposes of NI 43-101 with respect to the mineralization being reported on. The technical information has been included herein with the consent and prior review of the above noted Qualified Person. The Qualified Person has verified the data disclosed, and data underlying the information or opinions contained herein.

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