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reserves-and-resource-summary

2016 Mineral Reserves and Resources

Mineral resources (“resources”) and mineral reserves (“reserves”) have been estimated as at December 31, 2016 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 Reserves

100% BASIS



PROVEN PROBABLE
As at December 31, 2016 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel1 53,047 1.0 1,751 9,357 1.1 327
Essakane1 - - - 89,676 1.1 3,311
Sadiola2 23 2.4 2 77,120 1.8 4,383
Westwood3 971 8.1 254 2,714 9.1 792
Total proven reserves


54,041 1.2 2,007
Total probable reserves


178,867 1.5 8,813
Total proven and probable reserves


232,909 1.4 10,820

As at December 31, 2016: Proven

Rosebel1
Tonnes (000): 53,047
Grade (g/t): 1.0
Contained Ounces (000): 1,751

Essakane1
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Sadiola2
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Westwood3
Tonnes (000): 971
Grade (g/t): 8.1
Contained Ounces (000): 254

As at December 31, 2016: Probable

Rosebel1
Tonnes (000): 9,357
Grade (g/t): 1.1
Attributable Contained Ounces (000): 327

Essakane1
Tonnes (000): 89,676
Grade (g/t): 1.1
Attributable Contained Ounces (000): 3,311

Sadiola2
Tonnes (000): 77,120
Grade (g/t): 1.8
Attributable Contained Ounces (000): 4,383

Westwood3
Tonnes (000): 2,714
Grade (g/t): 9.1
Attributable Contained Ounces (000): 792

Total proven reserves
Tonnes (000): 54,041
Grade (g/t): 1.2
Attributable Contained Ounces (000): 2,007

Total probable reserves
Tonnes (000): 178,867
Grade (g/t): 1.5
Attributable Contained Ounces (000): 8,813

Total proven and probable reserves
Tonnes (000): 232,909
Grade (g/t): 1.4
Attributable Contained Ounces (000): 10,820

Attributable Reserves


PROVEN PROBABLE
As at December 31, 2016 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel1 (95%) 50,395 1.0 1,663 8,889 1.1 311
Essakane1 (90%) - - - 80,708 1.1 2,980
Sadiola2 (41%) 10 2.4 1 31,619 1.8 1,797
Westwood3 (100%) 971 8.1 254 2,714 9.1 792
Total proven reserves


51,375 1.2 1,918
Total probable reserves


123,931 1.5 5,880
Total proven and probable reserves


175,306 1.4 7,798

As at December 31, 2016: Proven

Rosebel1 (95%)
Tonnes (000): 50,395
Grade (g/t): 1.0
Contained Ounces (000): 1,663

Essakane1 (90%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Sadiola2 (41%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Westwood3 (100%)
Tonnes (000): 971
Grade (g/t): 8.1
Contained Ounces (000): 254

As at December 31, 2016: Probable

Rosebel1 (95%)
Tonnes (000): 8,889
Grade (g/t): 1.1
Contained Ounces (000): 311

Essakane1(90%)
Tonnes (000): 80,708
Grade (g/t): 1.1
Contained Ounces (000): 2,980

Sadiola2 (41%)
Tonnes (000): 31,619
Grade (g/t): 1.8
Contained Ounces (000): 1,797

Westwood3 (100%)
Tonnes (000): 2,714
Grade (g/t): 9.1
Contained Ounces (000): 792

Total proven reserves
Tonnes (000): 51,375
Grade (g/t): 1.2
Contained Ounces (000): 1,918

Total probable reserves
Tonnes (000): 123,931
Grade (g/t): 1.5
Contained Ounces (000): 5,880

Total proven and probable reserves
Tonnes (000): 175,306
Grade (g/t): 1.4
Contained Ounces (000): 7,798

* 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 Resources

(Inclusive of Mineral Reserves)
100% BASIS



MEASURED INDICATED INFERRED
As at December 31, 2016 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Rosebel1 1329,262 1.0 4,026 60,768 1.0 1,999 22,307 0.9 633
Essakane1 - - - 124,760 1.2 4,617 13,807 1.1 488
Sadiola2 23 2.4 2 126,652 1.7 7,099 19,082 1.7 1,036
Westwood3 652 12.9 271 2,079 13.7 915 6,343 10.9 2,223
Côté Gold4 - - - 289,183 0.9 8,354 66,894 0.6 1,174
Boto4 - - - 27,670 1.8 1,563 2,922 1.3 125
Diakha-Siribaya4 - - - 2,102 1.9 129 19,816 1.7 1,092
Pitangui4 - - - - - - 4,252 5.0 679
Total measured resources





129,937 1.0 4,299
Total indicated resources





633,214 1.2 24,675
Total measured and indicated resources5,6





763,151 1.2 28,974
Total inferred resources





155,423 1.5 7,450

As at December 31, 2016: Measured

Rosebel1
Tonnes (000): 129,262
Grade (g/t): 1.0
Contained Ounces (000): 4,026

Essakane1
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Sadiola2
Tonnes (000): 23
Grade (g/t): 2.4
Contained Ounces (000): 2

Westwood3
Tonnes (000): 652
Grade (g/t): 12.9
Contained Ounces (000): 271

Côté Gold4
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Boto4
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Diakha-Siribaya4
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Pitangui4 (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2016: Indicated

Rosebel1
Tonnes (000): 60,768
Grade (g/t): 1.0
Contained Ounces (000): 1,999

Essakane1
Tonnes (000): 124,760
Grade (g/t): 1.2
Contained Ounces (000): 4,617

Sadiola2
Tonnes (000): 126,652
Grade (g/t): 1.7
Contained Ounces (000): 7,099

Westwood3
Tonnes (000): 2,079
Grade (g/t): 13.7
Contained Ounces (000): 915

Côté Gold4
Tonnes (000): 289,183
Grade (g/t): 0.9
Contained Ounces (000): 8,354

Boto4
Tonnes (000): 27,670
Grade (g/t): 1.8
Contained Ounces (000): 1,563

Diakha-Siribaya4
Tonnes (000): 2,102
Grade (g/t): 1.9
Contained Ounces (000): 129

Pitangui4
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2016: Inferred

Rosebel1
Tonnes (000): 22,307
Grade (g/t): 0.9
Contained Ounces (000): 633

Essakane1
Tonnes (000): 13,807
Grade (g/t): 1.1
Contained Ounces (000): 488

Sadiola2
Tonnes (000): 19,082
Grade (g/t): 1.7
Contained Ounces (000): 1,036

Westwood3
Tonnes (000): 6,343
Grade (g/t): 10.9
Contained Ounces (000): 2,223

Côté Gold4
Tonnes (000): 66,894
Grade (g/t): 0.6
Contained Ounces (000): 1,174

Boto4
Tonnes (000): 2,922
Grade (g/t): 1.3
Contained Ounces (000): 125

Diakha-Siribaya4
Tonnes (000): 19,816
Grade (g/t): 1.7
Contained Ounces (000): 1,092

Pitangui4 (100%)
Tonnes (000): 4,252
Grade (g/t): 5.0
Contained Ounces (000): 679

Total measured resources
Tonnes (000): 129,937
Grade (g/t): 1.0
Contained Ounces (000): 4,299

Total indicated resources
Tonnes (000): 633,214
Grade (g/t): 1.2
Contained Ounces (000): 24,675

Total measured and indicated resources5,6
Tonnes (000): 763,151
Grade (g/t): 1.2
Contained Ounces (000): 29,974

Total inferred resources
Tonnes (000): 155,423
Grade (g/t): 1.5
Contained Ounces (000): 7,450

Attributable Resources


MEASURED INDICATED INFERRED
As at December 31, 2016 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Rosebel1 (95%) 122,799 1.0 3,825 57,730 1.0 1,899 21,192 0.9 601
Essakane1 (90%) - - - 112,284 1.2 4,155 12,426 1.1 539
Sadiola2 (41%) 10 2.4 1 51,917 1.7 2,910 7,824 1.7 425
Westwood3 (100%) 652 12.9 271 2,079 13.7 915 6,343 10.9 2,223
Côté Gold4 (92.5%) - - - 267,494 0.9 7,727 61,877 0.6 1,086
Boto4 (100%) - - - 27,670 1.8 1,563 2,922 1.3 125
Diakha-Siribaya4 (50%) - - - 1,051 1.9 64 9,908 1.7 546
Pitangui4 (100%) - - - - - - 4,252 5.0 679
Total measured resources





123,461 1.0 4,096
Total indicated resources





520,235 1.1 19,235
Total measured and indicated resources5,6





643,696 1.1 23,331
Total inferred resources





126,744 1.5 6,124

As at December 31, 2016: Measured

Rosebel1 (95%)
Tonnes (000): 122,799
Grade (g/t): 1.0
Contained Ounces (000): 3,825

Essakane1 (90%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Sadiola2 (41%)
Tonnes (000): 10
Grade (g/t): 2.4
Contained Ounces (000): 1

Westwood3 (100%)
Tonnes (000): 652
Grade (g/t): 12.9
Contained Ounces (000): 271

Côté Gold4 (92.5%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Boto5 (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Diakha-Siribaya4 (50%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

Pitangui6 (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2016: Indicated

Rosebel1 (95%)
Tonnes (000): 57,730
Grade (g/t): 1.0
Contained Ounces (000): 1,899

Essakane1(90%)
Tonnes (000): 112,284
Grade (g/t): 1.2
Contained Ounces (000): 4,155

Sadiola2 (41%)
Tonnes (000): 51,927
Grade (g/t): 1.7
Contained Ounces (000): 2,910

Westwood3 (100%)
Tonnes (000): 2,079
Grade (g/t): 13.7
Contained Ounces (000): 915

Côté Gold4 (92.5%)
Tonnes (000): 267,494
Grade (g/t): 0.9
Contained Ounces (000): 7,727

Boto5 (100%)
Tonnes (000): 27,670
Grade (g/t): 1.8
Contained Ounces (000): 1,563

Diakha-Siribaya4 (50%)
Tonnes (000): 1,051
Grade (g/t): 1.9
Contained Ounces (000): 64

Pitangui6 (100%)
Tonnes (000): -
Grade (g/t): -
Contained Ounces (000): -

As at December 31, 2016: Inferred

Rosebel1 (95%)
Tonnes (000): 21,192
Grade (g/t): 0.9
Contained Ounces (000): 601

Essakane1(90%)
Tonnes (000): 12,426
Grade (g/t): 1.1
Contained Ounces (000): 439

Sadiola2 (41%)
Tonnes (000): 7,824
Grade (g/t): 1.7
Contained Ounces (000): 425

Westwood3 (100%)
Tonnes (000): 6,343
Grade (g/t): 10.9
Contained Ounces (000): 2,223

Côté Gold4 (92.5%)
Tonnes (000): 61,877
Grade (g/t): 0.6
Contained Ounces (000): 1,086

Boto5 (100%)
Tonnes (000): 2,922
Grade (g/t): 1.3
Contained Ounces (000): 125

Diakha-Siribaya4 (50%)
Tonnes (000): 9,908
Grade (g/t): 1.7
Contained Ounces (000): 546

Pitangui6 (100%)
Tonnes (000): 4,252
Grade (g/t): 5.0
Contained Ounces (000): 679

Total measured resources
Tonnes (000): 123,461
Grade (g/t): 1.0
Contained Ounces (000): 4,096

Total indicated resources
Tonnes (000): 520,235
Grade (g/t): 1.1
Contained Ounces (000): 19,235

Total measured and indicated resources 5,6
Tonnes (000): 643,696
Grade (g/t): 1.1
Contained Ounces (000): 23,331

Total inferred resources
Tonnes (000): 126,744
Grade (g/t): 1.5
Contained Ounces (000): 6,124

1 Rosebel and Essakane mineral reserves have been estimated as of December 31, 2016 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2016 using a $1,500/oz gold price and have been estimated in accordance with NI 43-101.

2 Mineral reserves at Sadiola have been estimated as of December 31, 2016 using an average of $1,100/oz gold price and mineral resources have been estimated as of December 31, 2016 using a $1,400/oz gold price and have been estimated in accordance with JORC code.

3 Westwood mineral reserves have been estimated as of December 31, 2016 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2016 using a 6.0 g/t Au cut-off over a minimum width of 2 metres and have been estimated in accordance with NI 43-101.

4 Côté Gold, Boto, Diakha-Siribaya and Pitangui mineral resources have been estimated as of December 31, 2016 using a $1,500/oz gold price and have been estimated in accordance with NI 43-101.

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

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

* 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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