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IMG.TO ·

Attributable Reserves of 16.7 Million Ounces and Attributable Measu Red and Indicated Resources of 27. 2 Million Ounces

Resource Estimates

NEWS RELEASE

TSX:

IMG

NYSE:

IAG

IAMGOLD

REPORTS

201

9

ATTRIBUTABLE

RESERVES

OF

16.7

MILLION OUNCES

AND

ATTRIBUTABLE

MEASU

RED AND INDICATED RESOURCES OF

27.

2

MILLION OUNCES

All dollar amounts are in U.S. dollars unless otherwise indicated.

Measured and Indicated

Resource

Estimate

s are quoted Inclusive of Mineral Reserves for all sites and projects

Toronto, Ontario, February

1

8

, 20

20

–

IAMGOLD Corporation

(“IAMGOLD” or the

“

Company”) today

announced its 201

9

year

-

end mineral reserve and resource statement.

(See attached table

for more

details

.)

T

otal

attributable

Proven

and

Probable

Reserves

decreased

by

6

%

to

16.7

m

illion ounces at the end of

201

9

from

17.9

million ounces of

gold at

the end of

201

8

.

The

decrease

was primarily

due to mine

depletion during the year given the Company's attributable gold production of

762

,000 ounces

.

There was

no change in the $1,200 per ounce gold price assumption for

estimating

Mineral Reserves

at the

Company’s owned and operated mines

and development projects

.

Total attributable

Measured

and

Indicated Resources

(inclusive of

Reserves

)

decreased

overall by

2

% or

0.7 m

illion

ounces to

2

7.

2

million ounces of gold at the end of 201

9

.

T

otal attributable

Inferred Resources

increased by 38% or 3.

3

million ounces

to 12.0 million ounces

of gold

at the end of 2019

, primarily due to

the declaratio

n of

a Mineral

Resource

estimate

at the Nelligan Gold Project in Quebec

and the completion

of an updated Mineral Resource estimate at the

Côté

Gold

P

roject in Ontario

.

There

were

no change

s

in

the

gold price

assumption

s

for estimating mineral resources at Essakane

,

Rosebel

, and resource

-

stage

projects

($1,500 per ounce) or at Westwood ($1,200 per ounce

).

Gord

on

Stothart

, President and

COO

of IAMGOLD, commented, “

In 2019, we

made further progress in

advancing

the

resource stage projects

in

our pipeline.

At

the

Nelligan

Gold Project

in Quebec, we

declared a

n initial

mineral

resource

and

continued to identify additional resources at the

Côté

Gold

P

roject.

We also announced an updated mineral

resource estimate at Pitangui in

Brazil,

successfully

convert

ing

52%

of

its

resources

to

the

indicated category.

In Ontario,

we discovered

Gosselin

ju

st 1.5

k

ilometres

from the proposed Côté pit

,

and

reported positive drill results

from this

zone

. In Quebec, we

continued to explore the Rouyn Gold Project,

located

approximately 45 kilometres southwest of

Westwood,

and

reported

encouraging

drill results. In Guinea,

situated

between

our

Boto Gold

Pro

j

ect in

Senegal

and

our

Diakha

-

Siribaya

Project in Mali, we

announced

a

n

exciting

new discovery with high

grade intersections

on

the Karita Gold Project

.

In

addition to the ongoing resource development programs

at our existing operations, the potential for delineation of additional resources from our planned 2020

exploration program is strong.

We look forward to providing updates from the drill bit as the year

progresses.

”

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 oc

cur 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 “may”,

“will”,

“should”, “continue”, “expect”, “expected”, “anticipate”, “estimate”, “believe”, “intend”, “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 caus

e 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 ex

penditures 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 IAMGOLD’s most recent Form 4

0

-

F/Annual Information

page

2

of

6

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 date on which it is made and, except as

may be requ

ired by applicable securities laws, the Company disclaims any intent or obligation to update any forward

-

looking statement.

Technical Information and Qualified Person/Quality Control Notes

The mineral resource estimates 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 review

and approval

of all

mineral

resource and reserve estimates for IAMGOLD

contained here

in

is Lise

Chénard

, 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 operat

ions 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.

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.

Notes to

Investors Regarding the Use of Resources

Cautionary Note to Investors Concerning Estimates of Measured and Indicated Resources

This news release uses th

e terms "measured resources" and "indicated resources". We advise investors that while

those terms are recognized and required by Canadian regulations, the

United States Securities and Exchange

Commission (the “

SEC

”)

does not recognize them.

Investors are cautioned not to assume that any part or all of

mineral deposits in these categories will ever be converted into reserves

.

Cautionary Note to Investors Concerning Estimates of Inferred

Resources

This news release also uses the term "inferred resources". We advise investors that while this term is recognized and

required by Canadian regulations, the SEC does not recognize it.

"Inferred resources" have a great amount of

uncertainty as to their existence, and great uncertainty as to their economic and legal feasibility. It cannot be

assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher cat

egory. Under

Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre

-

feasibility studies,

except in rare cases.

Investors are cautioned not to assume that part or all of an inferred resource exists, or is

econom

ically or legally mineable.

Scientific and Technical Disclosure

IAMGOLD is reporting mineral resource and reserve estimates in accordance with the CIM guidelines for the

estimation, classification and reporting of resources and reserves.

Note: Mineral reserves and mineral resources for IAMGOLD’s gold mines for the

201

9

year

-

end statement were

estimated using a $1,

2

00

per ounce gold price (unless otherwise indicated in the notes in Table 1) for mineral

reserves and a $1,500 per ounce price

for mineral resources (unless otherwise indicated in the notes in Table 1).

For open pit operations, gold resources are constrained within an economic pit shell.

Cautionary Note to U.S. Investors

The

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 this

news release

, 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. You can review and obtain copies

of these filings from the SEC's website at http://www.sec.gov/e

dgar.shtml or by contacting the Investor Relations

department.

The Canadian Securities Administrators' National Instrument 43

-

101 ("NI 43

-

101") requires mining companies to

disclose reserves and resources using the subcategories of "proven" reserves, "prob

able" reserves, "measured"

resources, "indicated" resources and "inferred" resources. Mineral resources that are not mineral reserves do not

demonstrate

economic viability.

A mineral reserve is the economically mineable part of a measured or indicated min

eral resource demonstrated by at

least a preliminary feasibility study. This study must include adequate information on mining, processing,

metallurgical, economic and other relevant factors that demonstrate, at the time of reporting, that economic extract

ion

can be justified. A mineral reserve includes diluting materials and allows for losses that may occur when the material

page

3

of

6

is mined. A proven mineral reserve is the economically mineable part of a measured mineral resource demonstrated

by at least a prelim

inary feasibility study. A probable mineral reserve is the economically mineable part of an

indicated, and in some circumstances, a measured mineral resource demonstrated by at least a preliminary feasibility

study.

A mineral resource is a concentration o

r occurrence of natural, solid, inorganic material, or natural, solid fossilized

organic material including base and precious metals in or on the Earth's crust in such form and quantity and of such a

grade or quality that it has reasonable prospects for ec

onomic extraction. The location, quantity, grade, geological

characteristics and continuity of a mineral resource are known, estimated or interpreted from specific geological

evidence and knowledge. A measured mineral resource is that part of a mineral res

ource for which quantity, grade or

quality, densities, shape and physical characteristics are so well established that they can be estimated with

confidence sufficient to allow the appropriate application of technical and economic parameters, to support pr

oduction

planning and evaluation of the economic viability of the deposit. The estimate is based on detailed and reliable

exploration, sampling and testing information gathered through appropriate techniques from locations such as

outcrops, trenches, pits,

workings and drill holes that are spaced closely enough to confirm both geological and grade

continuity. An indicated mineral resource is that part of a mineral resource for which quantity, grade or quality,

densities, shape and physical characteristics c

an be estimated with a level of confidence sufficient to allow the

appropriate application of technical and economic parameters, to support mine planning and evaluation of the

economic viability of the deposit. The estimate is based on detailed and reliabl

e exploration and testing information

gathered through appropriate techniques from locations such as outcrops, trenches, pits, workings and drill holes that

are spaced closely enough for geological and grade continuity to be reasonably assumed. An inferred

mineral

resource is that part of a mineral resource for which quantity and grade or quality can be estimated on the basis of

geological evidence and limited sampling and reasonably assumed, but not verified, geological and grade continuity.

The estimate i

s based on limited information and sampling gathered through appropriate techniques from locations

such as outcrops, trenches, pits, workings and drill holes. Mineral resources which are not mineral reserves do not

have demonstrated economic viability.

Investors are cautioned not to assume that part or all of an inferred resource exists, or is economically or

legally mineable.

A feasibility study is a comprehensive technical and economic study of the selected development option for a mineral

project tha

t includes appropriately detailed assessments of realistically assumed mining, processing, metallurgical,

economic, marketing, legal, environmental, social and governmental considerations together with any other relevant

operational factors and detailed fi

nancial analysis,

that are necessary to demonstrate at the time of reporting that

extraction is reasonably justified (economically mineable).

The results of the study may reasonably serve as the

basis for a final decision by a proponent or financial inst

itution to proceed with, or finance, the development of the

project.

The confidence level of the study will be higher than that of a Pre

-

Feasibility Study.

A Pre

-

Feasibility Study is a comprehensive study of a range of options for the technical and econo

mic viability of a

mineral project that has advanced to a stage where a preferred mining method, in the case of underground mining, or

the pit configuration, in the case of an open pit, is established and an effective method of mineral processing is

determ

ined. It includes a financial analysis based on reasonable assumptions on mining, processing, metallurgical,

economic, marketing, legal, environmental, social and governmental considerations and the evaluation of any other

relevant factors which are suffic

ient for a qualified person, acting reasonably, to determine if all or part of the Mineral

Resource may be classified as a Mineral Reserve.

About IAMGOLD

IAMGOLD (

www.iamgold.com

) is a mid

-

tier mining company with

three

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 ac

quisition

opportunities. IAMGOLD is in a strong financial position with extensive management and operational

expertise.

For further information please contact

:

Indi Gopinathan,

VP,

Investor Relations

& Corporate Communications

, IAMGOLD

Corporation

Tel: (416) 360

-

4743 Mobile:

(416) 388

-

6883

Martin Dumont

,

S

enior Analyst

Investor Relations, IAMGOLD Corporation

Tel: (416) 933

-

5783

Mobile:

(647) 967

-

9942

IAMGOLD Corporation

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

Newsfile’s

website

at

www.newsfilecorp.com

. All material information on IAMGOLD can be found at

www.sedar.com

or at

www.sec.gov

.

page

4

of

6

Si vous désirez obtenir la version française de ce communiqué, veuillez consulter le

www.iamgold.com/French

/accueil/default.aspx

.

Mineral Reserves and Resources of Gold Operations as of

December 31, 201

9

(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)

Measured and

I

ndicated

R

esources are inclusive of

P

roven and

P

robable

R

eserves.

page

5

of

6

Tonnes (000s)

Grade (g/t)

Ounces Contained

(000s)

Attributable Contained

Ounces (000s)

Rosebel

(3)

, Suriname

(95%)

Proven Reserves

29,522

0.6

574

545

Probable Reserves

92,356

1.0

2,947

2,800

Subtotal

121,878

0.9

3,521

3,345

Measured Resources

35,276

0.6

698

663

Indicated Resources

247,210

0.9

7,397

7,027

Inferred Resources

64,191

0.9

1,785

1,696

Saramacca

(3)

, Suriname

(66.5%)

Proven Reserves

111

0.5

2

1

Probable Reserves

26,090

1.8

1,531

1,018

Subtotal

26,201

1.8

1,533

1,019

Measured Resources

111

0.5

2

1

Indicated Resources

27,509

2.0

1,752

1,165

Inferred Resources

11,689

0.7

270

180

Essakane

(3)

, Burkina Faso

(90%)

Probable Reserves

124,713

1.0

3,805

3,425

Subtotal

124,713

1.0

3,805

3,425

Indicated Resources

150,693

1.0

4,688

4,219

Inferred Resources

12,586

1.1

446

401

Gossey

(4)

, Burkina Faso

Indicated Resources

10,454

0.9

291

262

Inferred Resources

2,939

0.9

85

77

Westwood

(

7

)

, Canada

(100%)

Proven Reserves

1,196

8.1

313

313

Probable Reserves

4,073

6.7

871

871

Subtotal

5,269

7.0

1,184

1,184

Measured Resources

925

12.1

359

359

Indicated Resources

4,133

8.3

1,108

1,108

Inferred Resources

6,174

8.6

1,698

1,698

Sadiola

(

8

)

, Mali

(

41

%)

Probable Reserves

59,751

2.0

3,860

1,583

Subtotal

59,751

2.0

3,860

1,583

Indicated Resources

113,725

1.9

6,793

2,785

Inferred Resources

17,642

1.7

956

392

Côté Gold

(

9

)

, Canada

(64.75%)

Proven Reserves

139,253

1.0

4,640

3,004

Probable Reserves

93,747

0.9

2,644

1,712

Subtotal

233,000

1.0

7,284

4,716

Measured Resources

152,100

1.0

4,720

3,056

Indicated Resources

213,400

0.8

5,480

3,548

Inferred Resources

189,600

0.6

3,820

2,473

Boto Gold

(3)

, Senegal

(90%)

Probable Reserves

29,040

1.7

1,593

1,434

Subtotal

29,040

1.7

1,593

1,434

Indicated Resources

40,567

1.6

2,033

1,830

Inferred Resources

8,196

1.8

469

422

Monster Lake

(

5

)

, Canada

(75%)

Inferred Resources

1,110

12.1

433

325

Nelligan

(

6

)

, Canada

(

75

%)

Inferred Resources

96,990

1.0

3,194

2,396

Eastern Borosi

(

10

)

, Nicaragua

(

51

%)

Inferred Resources

4,418

5.7

812

414

Pitangui

(

6

)

, Brazil

(

100

%)

Indicated Resources

3,330

4.4

470

470

Inferred Resources

3,559

3.8

433

433

Diakha

-

Siribaya

(

5

)

, Mali

(90%)

Indicated Resources

18,031

1.3

744

669

Inferred Resources

23,179

1.6

1,176

1,058

TOTAL

(

1

1

)

Proven & Probable Reserves

599,852

1.2

22,780

16,706

Measured and Indicated Resources

1,017,464

1.1

36,535

27,164

Inferred Resources

442,273

1.

1

15,577

11,965

page

6

of

6

Notes:

(

1

)

In mining

operations, measured and indicated resources that are not mineral reserves are considered uneconomic at the price used for re

serve estimations but are

deemed to have a reasonable prospect of economic extraction.

(

2

)

Although “measured resources”, “indicate

d resources” and “inferred resources” are categories of mineralization that are recognized and required to be disclosed under

Canadian regulations, SEC Industry Guide 7 does not recognize them. Disclosure of contained ounces is permitted under Canadi

an re

gulations; however, SEC Industry

Guide 7 generally permits resources to be reported only as in place tonnage and grade. See “Cautionary Note to U.S. Investor

s Regarding Disclosure of Mineral Reserve

and Mineral Resource Estimates”.

(

3

)

Rosebel

, Saramacca,

Essakane,

and Boto Gold

mineral reserves have been estimated as of December 31, 201

9

using a $1,200/oz gold price and mineral resources

have been estimated as of December 31, 201

9

using a $1,500/oz gold price and have been estimated in accordance with NI

43

-

101.

(

4

)

Gossey

has

been es

timated as of December 31, 2018

using a $1,

2

00/oz gold price and have been estimated in accordance with NI 43

-

101.

(5)

Monster Lake

and Diakha

-

Siribaya

mineral resources have been es

timated as of December 31, 2018

using a $1,

5

00/oz gold price and have been estimated in

accordance with NI 43

-

101.

(6)

Nelligan

and

Pitangui mineral resources have been es

timated as of December 31, 2019

using a $1,

5

00/oz gold price and have been estimated

in accordance with NI 43

-

101.

(

7

)

Westwood mineral reserves have been estimated as of December 31, 201

9

using a $1,200/oz

gold price and mineral resources have been estimated as of December 31,

201

9

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.

(

8

)

Mineral reserves at Sadiola have been estimated as of De

cember 31, 201

9

using an average of $1,200/oz gold price and mineral resources have been estimated as of

December 31, 201

9

using a $1,400/oz gold price and have been estimated in accordance with the JORC code.

(

9

)

Côté Gold Mineral Reserves have been esti

mated as of December 31, 2018 using a $1

,

200/oz gold price. The Mineral Resources have been estimated as of December

31, 2019 using a $1

,

500/oz

gold price and have been estimated in accordance with NI 43

-

101.

(

10

)

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 3

1, 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 2.0

g/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.

(

1

1

)

Due to rounding, numbers presented throughout this document may not add up precisely to the totals.

The Company’s reserve estimate is comprised of in

-

place material, i.e.,

contained ounces of gold and metallurgical recovery factors must

be taken into account in order to assess and quantify the recoverable material.

There are numerous parameters inherent in estimating proven and probable mineral reserves, including many facto

rs beyond the

Company’s control. The estimation of reserves is a subjective process, and the accuracy of any reserve estimate is a function

of the

quality of available data and of engineering and geological interpretation and judgment. Results from drillin

g, testing and production, as

well as material changes in metal prices subsequent to the date of an estimate, may justify a revision of such estimates.