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reserves-and-resource-summary

2018 Mineral Reserves and Resources

Mineral resources (“resources”) and mineral reserves (“reserves”) have been estimated as at December 31, 2018 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.

Technical Information and Qualified Person/Quality Control Notes

The mineral resource estimates contained herein 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 review and approval of all mineral resource and reserve estimates for IAMGOLD contained herein is Lise Chenard, Eng., Director, Mining Geology. Lise has worked in the mining industry for more than 35 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.

Gold Mineral Reserves1

100% BASIS



PROVEN PROBABLE
As at December 31, 2018 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel 29,776 0.6 587 100,583 1.0 3,208
Saramacca - - - 26,549 1.8 1,542
Essakane - - - 148,812 0.9 4,380
Westwood 1,317 7.9 336 3,627 7.5 875
Sadiola 118 1.7 6 63,674 1.9 3,971
Côté Gold 139,253 1.0 4,640 93,747 0.9 2,644
Boto Gold - - - 35,060 1.7 1,926
Total proven reserves


170,464 1.0 5,969
Total probable reserves


472,052 1.2 18,546
Total proven and probable reserves


642,516 1.2 24,116

As at December 31, 2018: Proven

Rosebel
Tonnes (000): 29,776
Grade (g/t): 0.6
Contained Ounces (000): 587

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

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

Westwood
Tonnes (000): 1,317
Grade (g/t): 7.9
Contained Ounces (000): 336

Sadiola
Tonnes (000): 118
Grade (g/t): 1.7
Contained Ounces (000): 6

Côté Gold
Tonnes (000): 139,700
Grade (g/t): 1.0
Contained Ounces (000): 4,640

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

As at December 31, 2018: Probable

Rosebel
Tonnes (000): 100,583
Grade (g/t): 1.0
Attributable Contained Ounces (000): 3,208

Saramacca
Tonnes (000): 26,549
Grade (g/t): 1.8
Attributable Contained Ounces (000): 1,542

Essakane
Tonnes (000): 148,812
Grade (g/t): 0.9
Attributable Contained Ounces (000): 4,380

Westwood
Tonnes (000): 3,627
Grade (g/t): 7.5
Attributable Contained Ounces (000): 875

Sadiola
Tonnes (000): 63,674
Grade (g/t): 1.9
Attributable Contained Ounces (000): 3,971

Côté Gold
Tonnes (000): 93,747
Grade (g/t): 0.9
Attributable Contained Ounces (000): 2,644

Boto Gold
Tonnes (000): 35,060
Grade (g/t): 1.7
Attributable Contained Ounces (000): 1,926

Total proven reserves
Tonnes (000): 170,464
Grade (g/t): 1.0
Attributable Contained Ounces (000): 5,969

Total probable reserves
Tonnes (000): 472,052
Grade (g/t): 1.2
Attributable Contained Ounces (000): 18,546

Total proven and probable reserves
Tonnes (000): 642,516
Grade (g/t): 1.2
Attributable Contained Ounces (000): 24,116

Attributable Reserves


PROVEN PROBABLE
As at December 31, 2018 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel (95%) 28,287 0.6 558 95,554 1.0 3,048
Saramacca (66.5%) - - - 17,655 1.8 1,025
Essakane (90%) - - - 133,931 0.9 3,942
Westwood (100%) 1,317 7.9 336 3,627 7.5 875
Sadiola (41%) 48 1.7 3 26,106 1.9 1,628
Côté Gold (64.75%) 90,166 1.0 3,004 60,701 0.9 1,712
Boto Gold (100%) - - - 31,554 1.7 1,733
Total proven reserves


119,819 1.0 3,901
Total probable reserves


369,128 1.2 13,964
Total proven and probable reserves


488,947 1.1 17,864

As at December 31, 2018: Proven

Rosebel (95%)
Tonnes (000): 28,287
Grade (g/t): 0.6
Contained Ounces (000): 558

Saramacca (66.5%)
Tonnes (000): 17,655
Grade (g/t): 1.8
Contained Ounces (000): 1,025

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

Westwood (100%)
Tonnes (000): 1,317
Grade (g/t): 7.9
Contained Ounces (000): 336

Sadiola (41%)
Tonnes (000): 48
Grade (g/t): 1.7
Contained Ounces (000): 3

Côté Gold (64.75%)
Tonnes (000): 90,166
Grade (g/t): 1.0
Contained Ounces (000): 3,004

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

As at December 31, 2018: Probable

Rosebel (100%)
Tonnes (000): 95,554
Grade (g/t): 1.0
Contained Ounces (000): 3,048

Saramacca (66.5%)
Tonnes (000): 17,655
Grade (g/t): 1.8
Contained Ounces (000): 1,025

Essakane (90%)
Tonnes (000): 133,931
Grade (g/t): 0.9
Contained Ounces (000): 3,942

Westwood (100%)
Tonnes (000): 3,627
Grade (g/t): 7.5
Contained Ounces (000): 875

Sadiola (41%)
Tonnes (000): 26,106
Grade (g/t): 1.9
Contained Ounces (000): 1,628

Côté Gold (64.75%)
Tonnes (000): 60,701
Grade (g/t): 0.9
Contained Ounces (000): 1,712

Boto Gold (100%)
Tonnes (000): 31,554
Grade (g/t): 1.7
Contained Ounces (000): 1,733

Total proven reserves
Tonnes (000): 119,819
Grade (g/t): 1.0
Contained Ounces (000): 3,901

Total probable reserves
Tonnes (000): 369,128
Grade (g/t): 1.2
Contained Ounces (000): 13,964

Total proven and probable reserves
Tonnes (000): 488,947
Grade (g/t): 1.1
Contained Ounces (000): 17,864

* 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, 2018 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
35,645 0.6 711 256,835 0.9 7,683 64,770 0.9 1,793
Saramacca - - - 27,938
2.0 1,763 11,825 0.7 273
Essakane - - - 173,041 1.0 5,287 13,811 1.1 470
Gossey - - - 10,454 0.9 291 2,939 0.9 85
Westwood 1,007 11.9 385 3,169 10.8 1,101 5,494 9.5 1,680
Sadiola 118
1.7
6 117,647 1.8 6,904 17,643 1.7 956
Côté Gold 171,900
1.0
5,310
183,500 0.8 4,660 112,800 0.7 2,430
Boto Gold - - - 48,045
1.6 2,487 2,483 1.8 144
Monster Lake - - - - - - 1,110 12.1 433
Eastern Borosi - - - - - - 4,418 5.7 812
Pitangui - - - - - - 5,365 4.7 819
Diakha-Siribaya - - - 18,031
1.3
744
23,179 1.6 1,176
Total measured resources





208,670 1.0 6,412
Total indicated resources





838,660 1.1 30,920
Total measured and indicated resources





1,047,330 1.1 37,333
Total inferred resources





265,837 1.3 11,071

As at December 31, 2018: Measured

Rosebel
Tonnes (000): 35,645
Grade (g/t): 0.6
Contained Ounces (000): 711

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

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

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

Westwood
Tonnes (000): 1,007
Grade (g/t): 11.9
Contained Ounces (000): 385

Sadiola
Tonnes (000): 118
Grade (g/t): 1.7
Contained Ounces (000): 6

Côté Gold
Tonnes (000): 171,900
Grade (g/t): 1.0
Contained Ounces (000): 5,310

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

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

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

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

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

As at December 31, 2018: Indicated

Rosebel
Tonnes (000): 256,835
Grade (g/t): 0.9
Contained Ounces (000): 7,683

Saramacca
Tonnes (000): 27,938
Grade (g/t): 2.0
Contained Ounces (000): 1,763

Essakane
Tonnes (000): 173,041
Grade (g/t): 1.0
Contained Ounces (000): 5,287

Gossey
Tonnes (000): 10,454
Grade (g/t): 0.9
Contained Ounces (000): 291

Westwood
Tonnes (000): 3,169
Grade (g/t): 10.8
Contained Ounces (000): 1,101

Sadiola
Tonnes (000): 117,647
Grade (g/t): 1.8
Contained Ounces (000): 6,904

Côté Gold
Tonnes (000): 183,500
Grade (g/t): 0.8
Contained Ounces (000): 4,660

Boto Gold
Tonnes (000): 48,045
Grade (g/t): 1.6
Contained Ounces (000): 2,487

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

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

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

Diakha-Siribaya
Tonnes (000): 18,031
Grade (g/t): 1.3
Contained Ounces (000): 744

As at December 31, 2018: Inferred

Rosebel
Tonnes (000): 64,770
Grade (g/t): 0.9
Contained Ounces (000): 1,793

Saramacca
Tonnes (000): 11,825
Grade (g/t): 0.7
Contained Ounces (000): 273

Essakane
Tonnes (000): 13,811
Grade (g/t): 1.1
Contained Ounces (000): 470

Gossey
Tonnes (000): 2,939
Grade (g/t): 0.9
Contained Ounces (000): 85

Westwood
Tonnes (000): 5,494
Grade (g/t): 9.5
Contained Ounces (000): 1,680

Sadiola
Tonnes (000): 17,643
Grade (g/t): 1.7
Contained Ounces (000): 956

Côté Gold
Tonnes (000): 112,800
Grade (g/t): 0.7
Contained Ounces (000): 2,430

Boto Gold
Tonnes (000): 2,483
Grade (g/t): 1.8
Contained Ounces (000): 144

Monster Lake
Tonnes (000): 1,110
Grade (g/t): 1.8
Contained Ounces (000): 144

Eastern Borosi
Tonnes (000): 4,418
Grade (g/t): 5.7
Contained Ounces (000): 812

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

Diakha-Siribaya
Tonnes (000): 23,179
Grade (g/t): 1.6
Contained Ounces (000): 1,176

Total measured resources
Tonnes (000): 206,670
Grade (g/t): 1.0
Contained Ounces (000): 6,412

Total indicated resources
Tonnes (000): 838,660
Grade (g/t): 1.1
Contained Ounces (000): 30,920

Total measured and indicated resources
Tonnes (000): 1,047,330
Grade (g/t): 1.1
Contained Ounces (000): 37,333

Total inferred resources
Tonnes (000): 265,837
Grade (g/t): 1.3
Contained Ounces (000): 11,071

Attributable Resources


MEASURED INDICATED INFERRED
As at December 31, 2018 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 33,863 0.6 675 243,993 0.9 7,299 61,532 0.9 1,703
Saramacca
- - - 18,579 2.0 1,172 7,864 0.7 182
Essakane
- - - 155,737 1.0 4,759 12,430 1.1 423
Gossey - - - 9,409 0.9 262 2,645 0.9
77
Westwood
1,007 11.9 385 3,169 10.8 1,101 5,494 9.5 1,680
Sadiola
48 1.7 3 48,235 1.8 2,831 7,234 1.7 392
Côté Gold
111,305 1.0 3,438 118,816 0.8 3,017 73,038 0.7 1,573
Boto Gold
- - - 43,241 1.6 2,238 2,235 1.8 130
Monster Lake - - - - - - 555 12.1 217
Eastern Borosi - - - - - - 2,253 5.7 414
Pitangui
- - - - - - 5,365 4.7 819
Diakha-Siribaya - - - 16,228 1.3 669 20,861 1.6 1,058
Total measured resources





146,223 1.0 4,501
Total indicated resources





657,407 1.1 23,349
Total measured and indicated resources





803,630 1.1 27,850
Total inferred resources





201,505 1.3 8,668

As at December 31, 2018: Measured

Rosebel
Tonnes (000): 33,863
Grade (g/t): 0.6
Contained Ounces (000): 675

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

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

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

Westwood
Tonnes (000): 1,007
Grade (g/t): 11.9
Contained Ounces (000): 385

Sadiola
Tonnes (000): 48
Grade (g/t): 1.7
Contained Ounces (000): 3

Côté Gold
Tonnes (000): 111,305
Grade (g/t): 1.0
Contained Ounces (000): 3,438

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

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

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

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

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

As at December 31, 2018: Indicated

Rosebel
Tonnes (000): 243,993
Grade (g/t): 0.9
Contained Ounces (000): 7,299

Saramacca
Tonnes (000): 18,579
Grade (g/t): 2.0
Contained Ounces (000): 1,172

Essakane
Tonnes (000): 155,737
Grade (g/t): 1.0
Contained Ounces (000): 4,759

Gossey
Tonnes (000): 9,409
Grade (g/t): 0.9
Contained Ounces (000): 262

Westwood
Tonnes (000): 3,169
Grade (g/t): 10.8
Contained Ounces (000): 1,101

Sadiola
Tonnes (000): 48,235
Grade (g/t): 1.8
Contained Ounces (000): 2,831

Côté Gold
Tonnes (000): 118,816
Grade (g/t): 0.8
Contained Ounces (000): 3,017

Boto Gold
Tonnes (000): 43,241
Grade (g/t): 1.6
Contained Ounces (000): 2,238

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

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

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

Diakha-Siribaya
Tonnes (000): 16,228
Grade (g/t): 1.3
Contained Ounces (000): 669

As at December 31, 2018: Inferred

Rosebel
Tonnes (000): 61,532
Grade (g/t): 0.9
Contained Ounces (000): 1,703

Saramacca
Tonnes (000): 7,864
Grade (g/t): 0.7
Contained Ounces (000): 182

Essakane
Tonnes (000): 12,430
Grade (g/t): 1.1
Contained Ounces (000): 423

Gossey
Tonnes (000): 2,645
Grade (g/t): 0.9
Contained Ounces (000): 77

Westwood
Tonnes (000): 5,494
Grade (g/t): 9.5
Contained Ounces (000): 1,680

Sadiola
Tonnes (000): 7,234
Grade (g/t): 1.7
Contained Ounces (000): 392

Côté Gold
Tonnes (000): 73,038
Grade (g/t): 0.7
Contained Ounces (000): 1,573

Boto Gold
Tonnes (000): 2,235
Grade (g/t): 1.8
Contained Ounces (000): 130

Monster Lake
Tonnes (000): 555
Grade (g/t): 12.1
Contained Ounces (000): 217

Eastern Borosi
Tonnes (000): 2,253
Grade (g/t): 5.7
Contained Ounces (000): 414

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

Diakha-Siribaya
Tonnes (000): 20,861
Grade (g/t): 1.6
Contained Ounces (000): 1,058

Total measured resources
Tonnes (000): 146,223
Grade (g/t): 1.0
Contained Ounces (000): 4,501

Total indicated resources
Tonnes (000): 657,407
Grade (g/t): 1.1
Contained Ounces (000): 23,349

Total measured and indicated resources
Tonnes (000): 803,630
Grade (g/t): 1.1
Contained Ounces (000): 27,850

Total inferred resources
Tonnes (000): 201,505
Grade (g/t): 1.3
Contained Ounces (000): 8,668

1 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.

2 Although “measured resources”, “indicated resources” and “inferred resources” are categories of mineralization that are recognized and required to be disclosed under Canadian regulations, the SEC does not recognize them. Disclosure of contained ounces is permitted under Canadian regulations; however, the SEC generally permits resources to be reported only as in place tonnage and grade. See “Cautionary Note to U.S. Investors Regarding Disclosure of Mineral Reserve and Mineral Resource Estimates”.

3 Rosebel, Saramacca, Essakane, Côté Gold, and Boto Gold mineral reserves have been estimated as of December 31, 2018 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2018 using a $1,500/oz gold price and have been estimated in accordance with NI 43-101.

4 Gossey, Monster Lake, Pitangui, and Diakha-Siribaya mineral resources have been estimated as of December 31, 2018 using a $1,500/oz gold price and have been estimated in accordance with NI 43-101.

5 Westwood mineral reserves have been estimated as of December 31, 2018 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2018 using a 5.5 g/t gold cut-off over a minimum width of 2.4 metres and have been estimated in accordance with NI 43-101.

6 Mineral reserves at Sadiola have been estimated as of December 31, 2018 using an average of $1,200/oz gold price and mineral resources have been estimated as of December 31, 2018 using a $1,400/oz gold price and have been estimated in accordance with the JORC code.

7 Eastern Borosi mineral resources are disclosed as gold equivalent ounces calculated using the formula: AuEq (g/t) = Au (g/t) + Ag (g/t) / 101.8; and have been estimated as of December 31, 2018 using a $1,500/oz gold price, and a $23/oz silver price and in accordance with NI 43-101. Underground resources are estimating using a cut-off grade of 2.0g/t gold equivalent with a minimum width of 2.4m and open pit resources are estimated using a cut-off grade of 0.42 g/t gold equivalent over a 3.0m minimum width.

8 Due to rounding, numbers presented may not add up precisely to the totals.

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