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reserves-and-resource-summary

2015 Mineral Reserves and Resources

Mineral resources (“resources”) and mineral reserves (“reserves”) have been estimated as at December 31, 2015 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, 2015 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel1 58,949 1.0 1,972 11,273 1.0 379
Essakane1 - - - 96,463 1.1 3,414
Sadiola2 - - - 69,795 1.9 4,357
Westwood3 744 7.5 180 1,718 7.6 418
Total proven reserves


59,693 1.1 2,152
Total probable reserves


179,249 1.5 8,568
Total proven and probable reserves


238,942 1.4 10,720

As at December 31, 2015: Proven

Rosebel1
Tonnes (000): 58,949
Grade (g/t): 1.0
Contained Ounces (000): 1,972

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

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

Westwood3/strong>
Tonnes (000): 744
Grade (g/t): 7.5
Contained Ounces (000): 180

As at December 31, 2015: Probable

Rosebel1
Tonnes (000): 11,273
Grade (g/t): 1.0
Attributable Contained Ounces (000): 379

Essakane1
Tonnes (000): 96,463
Grade (g/t): 1.1
Attributable Contained Ounces (000): 3,414

Sadiola2
Tonnes (000): 69,795
Grade (g/t): 1.9
Attributable Contained Ounces (000): 4,357

Westwood3
Tonnes (000): 1,718
Grade (g/t): 7.6
Attributable Contained Ounces (000): 418

Total proven reserves
Tonnes (000): 59,693
Grade (g/t): 1.1
Attributable Contained Ounces (000): 2,152

Total probable reserves
Tonnes (000): 179,249
Grade (g/t): 1.5
Attributable Contained Ounces (000): 8,568

Total proven and probable reserves
Tonnes (000): 238,942
Grade (g/t): 1.4
Attributable Contained Ounces (000): 10,720

Attributable Reserves


PROVEN PROBABLE
As at December 31, 2015 Tonnes
(000)
Grade
(g/t)
Contained Ounces
(000)
Tonnes
(000)
Grade
(g/t)
Contained
Ounces (000)
Rosebel1 (95%) 56,002 1.0 1,873 10,709 1.0 360
Essakane1 (90%) - - - 86,817 1.1 3,073
Sadiola2 (41%) - - - 28,616 1.9 1,786
Westwood3 (100%) 744 7.5 180 1,718 7.6 418
Total proven reserves


56,746 1.1 2,053
Total probable reserves


127,860 1.4 5,637
Total proven and probable reserves


184,606 1.3 7,690

As at December 31, 2015: Proven

Rosebel1 (95%)
Tonnes (000): 56,002
Grade (g/t): 1.0
Contained Ounces (000): 1,873

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

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

Westwood3 (100%)
Tonnes (000): 744
Grade (g/t): 7.5
Contained Ounces (000): 180

As at December 31, 2015: Probable

Rosebel1 (95%)
Tonnes (000): 10,709
Grade (g/t): 1.0
Contained Ounces (000): 360

Essakane1(90%)
Tonnes (000): 86,817
Grade (g/t): 1.1
Contained Ounces (000): 3,073

Sadiola2 (41%)
Tonnes (000): 28,616
Grade (g/t): 1.9
Contained Ounces (000): 1,786

Westwood3 (100%)
Tonnes (000): 1,718
Grade (g/t): 7.6
Contained Ounces (000): 418

Total proven reserves
Tonnes (000): 56,746
Grade (g/t): 1.1
Contained Ounces (000): 2,053

Total probable reserves
Tonnes (000): 127,860
Grade (g/t): 1.4
Contained Ounces (000): 5,637

Total proven and probable reserves
Tonnes (000): 184,606
Grade (g/t): 1.3
Contained Ounces (000): 7,690

* 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, 2015 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 136,502 1.0 4,262 63,140 1.0 2,056 22,481 0.9 635
Essakane1 - - - 137,753 1.1 5,024 18,548 1.1 637
Sadiola2 1,462 1.7 79 118,881 1.8 6,908 15,524 1.8 911
Westwood3 466 12.7 190 1,450 11.8 549 7,546 11.3 2,747
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





138,430 1.0 4,531
Total indicated resources





640,178 1.2 24,582
Total measured and indicated resources5,6





778,608 1.2 29,113
Total inferred resources





157,983 1.6 8,000

As at December 31, 2015: Measured

Rosebel1
Tonnes (000): 136,502
Grade (g/t): 1.0
Contained Ounces (000): 4,262

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

Sadiola2
Tonnes (000): 1,462
Grade (g/t): 1.7
Contained Ounces (000): 79

Westwood3
Tonnes (000): 466
Grade (g/t): 12.7
Contained Ounces (000): 190

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, 2015: Indicated

Rosebel1
Tonnes (000): 63,140
Grade (g/t): 1.0
Contained Ounces (000): 2,056

Essakane1
Tonnes (000): 137,753
Grade (g/t): 1.1
Contained Ounces (000): 5,024

Sadiola2
Tonnes (000): 118,881
Grade (g/t): 1.8
Contained Ounces (000): 6,908

Westwood3
Tonnes (000): 1,450
Grade (g/t): 11.8
Contained Ounces (000): 549

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, 2015: Inferred

Rosebel1
Tonnes (000): 22,481
Grade (g/t): 0.9
Contained Ounces (000): 635

Essakane1
Tonnes (000): 18,548
Grade (g/t): 1.1
Contained Ounces (000): 637

Sadiola2
Tonnes (000): 15,524
Grade (g/t): 1.8
Contained Ounces (000): 911

Westwood3
Tonnes (000): 7,546
Grade (g/t): 11.3
Contained Ounces (000): 2,747

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): 138,430
Grade (g/t): 1.0
Contained Ounces (000): 4,531

Total indicated resources
Tonnes (000): 640,178
Grade (g/t): 1.2
Contained Ounces (000): 24,582

Total measured and indicated resources5,6
Tonnes (000): 778,608
Grade (g/t): 1.2
Contained Ounces (000): 29,113

Total inferred resources
Tonnes (000): 157,983
Grade (g/t): 1.6
Contained Ounces (000): 8,000

Attributable Resources


MEASURED INDICATED INFERRED
As at December 31, 2015 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%) 129,677 1.0 4,049 59,983 1.0 1,953 21,357 0.9 603
Essakane1 (90%) - - - 123,978 1.1 4,522 16,693 1.1 573
Sadiola2 (41%) 599 1.7 32 48,741 1.8 2,832 6,365 1.8 374
Westwood3 (100%) 466 12.7 190 1,450 11.8 549 7,546 11.3 2,747
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





130,742 1.0 4,271
Total indicated resources





530,367 1.1 19,211
Total measured and indicated resources5,6





661,109 1.1 23,482
Total inferred resources





130,920 1.6 6,733

As at December 31, 2015: Measured

Rosebel1 (95%)
Tonnes (000): 129,677
Grade (g/t): 1.0
Contained Ounces (000): 4,049

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

Sadiola2 (41%)
Tonnes (000): 599
Grade (g/t): 1.7
Contained Ounces (000): 32

Westwood3 (100%)
Tonnes (000): 466
Grade (g/t): 12.7
Contained Ounces (000): 190

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, 2015: Indicated

Rosebel1 (95%)
Tonnes (000): 59,983
Grade (g/t): 1.0
Contained Ounces (000): 1,953

Essakane1(90%)
Tonnes (000): 123,978
Grade (g/t): 1.1
Contained Ounces (000): 4,522

Sadiola2 (41%)
Tonnes (000): 48,741
Grade (g/t): 1.8
Contained Ounces (000): 2,832

Westwood3 (100%)
Tonnes (000): 1,450
Grade (g/t): 11.8
Contained Ounces (000): 549

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, 2015: Inferred

Rosebel1 (95%)
Tonnes (000): 21,357
Grade (g/t): 0.9
Contained Ounces (000): 603

Essakane1(90%)
Tonnes (000): 16,693
Grade (g/t): 1.1
Contained Ounces (000): 573

Sadiola2 (41%)
Tonnes (000): 6,365
Grade (g/t): 1.8
Contained Ounces (000): 374

Westwood3 (100%)
Tonnes (000): 7,546
Grade (g/t): 11.3
Contained Ounces (000): 2,747

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): 125,894
Grade (g/t): 1.0
Contained Ounces (000): 4,124

Total indicated resources
Tonnes (000): 484,268
Grade (g/t): 1.1
Contained Ounces (000): 17,287

Total measured and indicated resources 5,6
Tonnes (000): 610,161
Grade (g/t): 1.1
Contained Ounces (000): 21,412

Total inferred resources
Tonnes (000): 106,809
Grade (g/t): 2.0
Contained Ounces (000): 7,018

1 Rosebel and Essakane mineral reserves have been estimated as of December 31, 2015 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2015 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, 2015 using an average of $1,190/oz gold price and mineral resources have been estimated as of December 31, 2015 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, 2015 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2015 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, 2015 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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