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Iamgold Provides Preliminary Operating Results FOR the Second Quarter 2021, Updates Production and Costs Guidance FOR 2021 and Costs Estimate FOR Its Côté GOLD Project

Financials

NEWS RELEASE

TSX: IMG NYSE: IAG

IAMGOLD PROVIDES PRELIMINARY OPERATING RESULTS FOR THE SECOND

QUARTER 2021, UPDATES PRODUCTION AND COSTS GUIDANCE FOR 2021 AND

COSTS ESTIMATE FOR ITS CÔTÉ GOLD PROJECT

Toronto, Ontario, July 22, 2021 – IAMGOLD Corporation (“IAMGOLD” or the “Company”) today provides

preliminary operating results for the second quarter 2021. The Company also announces a reduction in its

production guidance and an increase in its cost s guidance for 2021 as well as an increase in the cost s

estimate for its Côté Gold Project ("Côté" or the "Project"). All dollar amounts are in US dollars and a

CAD:USD exchange rate of $1.30, unless otherwise indicated.

PRELIMINARY OPERATING RESULTS

The following table summarizes preliminary second quarter operating results and updated full year 2021

guidance on an attributable basis for certain metrics. The guidance changes are based on the Company ’s

performance in the first half of 2021 and subsequent efforts to develop an updated preliminary outlook for

the second half of 2021.

Q2 2021

YTD 2021

Updated Full Year

Guidance 20211

Previous Full Year

Guidance 20212

Essakane (000s oz)3 106 208 390 – 400 365 – 390

Rosebel (000s oz)3 25 72 140 – 160 220 – 245

Westwood (000s oz)3 8 15 35 – 45 45 – 65

Total attributable production (000s oz) 139 295 565 – 605 630 – 700

Cash costs4 ($/oz sold) $1,102 $1,064 $1,115 – $1,150 $930 – $980

All-in sustaining costs3,4 ($/oz sold) $1,422 $1,324 $1,395 – $1,435 $1,230 – $1,280

1 The updated full year guidance is based on the following 2021 full year assumptions : average realized gold price of $1,745 per ounce, USD :CAD

exchange rate of 1.22, EUR:USD exchange rate of 1.20 and average crude oil price of $65 per barrel.

2 The previous full year guidance was based on the followi ng 2021 full year assumptions: average realized gold price of $1,750 per ounce, USD :CAD

exchange rate of 1.30, EUR:USD exchange rate of 1.19 and average crude oil price of $47 per barrel .

3 Consists of Essakane and Rosebel on an attributable basis, and Westwood on a 100% basis.

4 This is a non-GAAP performance measure. Refer to the Non-GAAP Performance Measures section at the end of this news release.

Total Company -wide attributable production guidance for 2021 has been reduced due to lower actual

production in the first half of 2021 from the Westwood and Rosebel mines and their anticipated output for

the remainder of 2021, par tially offset by higher production at the Essakane mine in the first half of 2021.

Total per-ounce costs guidance for 2021 has been increased mainly to reflect the lower total attributable

production guidance. Site capital expenditure estimates are expected to be slightly lower than previously

provided guidance (news release dated January 19, 2021), primarily due to an expected reduction in planned

work at Rosebel. In accordance with IFRS, the Company is reviewing the approximately $120 million carrying

amount of the Westwood mine to determine whether there is any indication of impairment, and if so, whether

an adjustment is necessary.

Essakane delivered strong second quarter results with higher gold production, desp ite ongoing challenges

in processing ore with high graphitic content, through operational efficiencies and the completion of the mill

upgrade. Essakane 2021 production guidance has been increased to reflect the higher production in the first

half of 2021.

Westwood 2021 production guidance has been reduced primarily to reflect additional safety measures

through the implementation of further ground support and egress es required in the East Zone and in

preparation for mining the Central and West Zone as well as slower-than-expected ramp-up of personnel.

We are also assessing the impact of these factors on 2022 planning.

Mining activities at Rosebel were primarily impacted in the second quarter by difficult operating conditions

caused by continuing unusually heavy rains and by challenging industrial relations up until the resolution of

the collective bargaining agreement in May. In addition, there was a significant increase in COVID-19 cases

due to the emergence of a new variant in Suriname during the second quarter. The increase in COVID -19

cases and social impacts, including multiple lockdowns in -country and a strained healthcare system,

adversely affected operations and projects. Furthermore, management of the high clay content ore from the

Saramacca deposit, exacerbated by the heavy rains, negatively impacted ore handling and mill throughput.

Due to the above-mentioned factors, and continued uncertainty related to the COVID-19 situation, Rosebel’s

2021 guidance has been adjusted downward. The Company is cont inuing to assess what, if any, ongoing

impacts these challenges may have on ore sequencing and 2022 production. Strategic mine development

activities have resumed and are intended to expose higher grade ore zones.

CÔTÉ GOLD PROJECT UPDATE

Construction Progress

Construction at Côté, a 70:30 joint venture (“JV”) between IAMGOLD, as the operator, and Sumitomo Metal

Mining Co., Ltd. ("SMM"), continues with the earthworks contractors advanc ing road widening and

overburden stripping and the commencement of work on water management infrastructure and the tailings

management facility. Plant site concrete works have commenced including the commissioning of the

concrete batch plant and the raft foun dations for the ball mill. Construction of the permanent camp is

progressing well with approximately 50% of the planned rooms complete. The Project is currently on

schedule and is 27% complete at June 30, 2021. The Project schedule remains on track for com mercial

production in H2-2023.

Costs Estimate Update

The Company has identified certain estimated project costs increases from a project review. The Company’s

70% share of updated estimated project costs from July 1, 2020, net of leasing, is now estimated at $1,125

million to $1,175 million (exclusive of expenditures prior to such date) at a CAD:USD exchange rate of $1.30

compared to the previous estimate of $875 million to $925 million at a CAD:USD exchange rate of $1.35. In

accordance with the terms of the joint venture, the updated capital costs will be reviewed by SMM.

The table below summarizes the updated estimated project costs:

Project costs estimate July 2020 July 2021

Company’s 70% share of project costs estimate $875 – $925 million $1,125 – $1,175 million1,2

Leasing (on a 70% project basis) $80 million $100 – $120 million3

CAD:USD exchange rate $1.35 $1.30

Expended4 - July 1, 2020 to June 30, 2021 – $193.0 million

Company’s remaining 70% share of project costs estimate $875 – $925 million $930 – $980 million

1 Total costs are approximately 95% capital expenditures and 5% non-capitalized costs. Approximately 95% of the estimated capital costs are in Canadian

dollars. The Company has implemented a hedge program which includes CAD:USD exchange rate hedging which will be described in greater detail in

the Company’s second quarter results.

2 Approximately $33 million of the increase is attributable to the unfavourable change in the currency exchange r ate.

3 Leasing is net of lease payments during the construction period . Previously $120 million at a CAD:USD exchange rate of $ 1.30 (see news release

dated May 3, 2021).

4 Calculated at an average CAD:USD exchange rate of $1.2871.

The change was primarily driven by increased structural, mechanical, piping , electrical and concrete

estimates for the process facility; increases to mine facilities costs; increases in earthworks materials and

manpower estimates; certain scope changes; inflation (including pricing increases due to COVID-19 related

supply chain challenges) ; changes in the currency exchange rate ; and costs related to COVID -19. The

project costs range increase includes new contingency amounts for the remaining expenditures estimate.

SECOND QUARTER 2021 RESULTS AND CONFERENCE CALL

Additional details regarding the second quarter operating and financial results as well as the progress of

activities at Côté will be provided when the Company discloses its second quarter financial results after

market hours on Wednesday, August 4th, 2021.

A conference call will be held on Thursday, August 5 th, 2021, at 8:30 a.m. (Eastern Time) for a discussion

with management regarding the Company’s operating performance and financial results for the second

quarter 2021. A webcast of the conference call will be available through the Company’s website at

www.iamgold.com.

Conference Call Information:

North America Toll-Free: 1-800-319-4610 or International number: 1-604-638-5340

A replay of this conference call will be available for one month following the call by dialing:

North America toll-free: 1-800-319-6413 or International number: 1-604-638-9010, passcode: 7235#

Please dial in 10 – 15 minutes prior to the scheduled start time as call volumes are heavy. If you are still

unable to connect from your primary telephone network after attempting all of the dial -in numbers provided,

if available, please retry using an alternate telephone network.

CAUTIONARY STATEMENT ON FORWARD-LOOKING INFORMATION

All information included in this news release, including any information as to the Company ’s future financial or operating

performance, and other statements that express management ’s expectations or estimates of future performance, including

statements in respect of the prospects of the Company ’s projects, other than statements of historical fact, constitute forward -

looking information or forward-looking statements with the meaning of applicable securities laws and are based on expectations,

estimates and projections as of the date of this news release. For example, forward-looking statements contained in this news

release include, without limitation, statements with respect to: the Company ’s guidance for production , cash costs, all -in

sustaining costs, capi tal expenditures, operations outlook, construction costs, development and expansion projects,

exploration, the future price of gold, foreign exchange rates, the estimation of mineral reserves and mineral resources, the

realization of mineral reserve and mineral resource estimates, the timing and amount of estimated future production, costs of

production, permitting timelines, currency fluctuations, requirements for additional capital, government regulation of mining

operations, environmental risks, unantici pated reclamation expenses, title disputes or claims and limitations on insurance

coverage. Forward-looking statements are provided for the purpose of providing information about management ’s current

expectations and plans relating to the future. Forward -looking statements are generally identifiable by, but are not limited to,

the use of the words “may”, “will”, “should”, “continue”, “expect”, "budget", "forecast", “anticipate”, “estimate”, “believe”, “intend”,

“plan”, "schedule", “guidance”, “ outlook”, “ potential”, "transformational", "best -in-class", "top -tier", “seek”, “ targets”,

"suspended", "superior return(s)", "superior shareholder return(s)", "cover", “strategy”, "superior" or “project” or the negative of

these words or other variations on these words or comparable terminology. Forward-looking statements are necessarily based

upon a number of estimates and assumptions that, while considered reasonable by management, are inherently subject to

significant business, economic and competitive uncertainties and contingencies and, as such, undue reliance must not be

placed on them.

The Company cautions the reader that reliance on such forward -looking statements involves known and unknown risks,

uncertainties and other factors that may cause the actual result s, performance or achievements of IAMGOLD to be materially

different from the Company’s estimated future results, performance or achievements expressed or implied by those forward -

looking statements. These risks, uncertainties and other factors include, but are not limited to, changes in the global prices for

gold, copper, silver or certain other commodities (such as diesel and electricity); changes in U.S. dollar and other currency

exchange rates, interest rates or gold lease rates; risks arising from hold ing derivative instruments; the level of liquidity and

capital resources; access to capital markets, and financing; mining tax regimes; ability to successfully integrate acquired assets;

legal, litigation, legislative, political or economic risks and new developments in the jurisdictions in which the Company carries

on business; the failure to obtain in a timely manner from authorities key permits, authorizations or approvals necessary for

exploration, development or operation ; operating or technical diffic ulties in connection with mining or development activities,

including geotechnical difficulties and major equipment failure, such as a conveyor belt breakdown, and seismicity, such as the

seismic event that occurred at Westwood mine on October 30, 2020; la ws and regulations governing the protection of the

environment; employee relations; attraction and retention of key employees and other qualified personnel ; availability and

increasing costs associated with mining inputs and labour ; negotiations with respect to new, reasonable collective labour

agreements may not be agreed to; the inaccuracy of estimated reserves and resources, metallurgical recoveries, capital and

operating costs, the speculative nature of exploration and development, including the risks of diminishing quantities or grades

of reserves; illegal mining; adverse changes in the Company’s credit rating; contests over title to properties, particularly title to

undeveloped properties; the inability to participate in any gold price increase above the cap in any collar transaction entered

into in conjunction with a forward gold sale arrangement; the potential direct or indirect operational impacts resulting from

external factors, including infectious diseases or pandemics, such as the COVID-19 outbreak, or adverse weather conditions;

and the inherent risks involved in the exploration, development and mining business generally. Please see the AIF or Form 40-

F available on www.sedar.com or www.sec.gov/edgar.shtml for a comprehensive discussion of the risks faced by the Company,

and which may cause the actual financial results, operating performance or achievements of IAMGOLD to be materially different

from the Company’s estimated future results, operating performance or achievements expressed or implied by forward-looking

information or forward-looking statements.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those

contained in forward-looking statements, there may be other factors tha t cause results not to be as anticipated, estimated or

intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could

differ materially from those anticipated in such statements.

The Company disclaims any intention or obligation to update or revise any forward -looking statements whether as a result of

new information, future events or otherwise except as required by applicable law.

NON-GAAP PERFORMANCE MEASURES

IAMGOLD uses certain non-GAAP financial performance measures in its news release, which are described in the following

section.

Cash costs (“CC”) per ounce sold and all-in sustaining costs (“AISC”) per ounce sold, on an attributable basis, are non-GAAP

performance measures. Cash costs include mine site operating costs such as mining, processing, administration, royalties,

production taxes, and realized derivative gains or losses, exclusive of depreciation, reclamation, capital expenditures and

exploration and evaluation costs. AISC include cost of sales, excluding depreciation expense, and includes sustaining capital

expenditures which are required to maintain existing operations, sustaining exploration and evaluation expenses, sustaining

lease principal payments, environmental rehabilit ation accretion and depreciation, by -product credits, and corporate general

and administrative costs. These costs are then divided by the Company ’s attributable ounces of gold sold by mine sites in

commercial production to arrive at CC and AISC per ounce sold. The Company believes that the use of CC and AISC per ounce

sold metrics will assist analysts, investors and other stakeholders of the Company in assessing its operating performance and

its ability to generate free cash flow. CC and AISC per ounce sold are intended to provide additional information only and do

not have any standardized meaning prescribed by IFRS, and are unlikely to be comparable to similar measures presented by

other issuers, and should not be considered in isolation or as a substitute for measures of performance prepared in accordance

with IFRS. Although the World Gold Council defined an all -in sustaining costs measure in 2013, it is not a regulatory

organization, and other companies may calculate this measure differently. These measures are not necessarily indicative of net

earnings or cash flow from operating activities as determined under IFRS.

About IAMGOLD

IAMGOLD is a mid -tier gold mining company operating in three regions globally: North America, South

America and West Africa. W ithin these regions the Company is developing high potential mining districts

that encompass operating mines, construction, development, and exploration projects. The Company’s

operating mines include Westwood in Canada, Rosebel (including Saramacca) in Su riname and Essakane

in Burkina Faso. A solid base of strategic assets is complemented by the Côté Gold construction project in

Canada, the Boto Gold development project in Senegal, as well as greenfield and brownfield exploration

projects in various countries located in the Americas and West Africa.

IAMGOLD employs approximately 5,000 people. IAMGOLD is committed to maintaining its culture of

accountable mining through high standards of Environmental, Social and Governance practices, including

its commitment to Zero Harm®, in every aspect of its business. IAMGOLD (www.iamgold.com) is listed on

the New York Stock Exchange (NYSE:IAG) and the Toronto Stock Exchange (TSX:IMG) and is one of the

companies on the JSI index1.

1 Jantzi Social Index (“JSI”). The JSI is a socially screened market capitalization-weighted common stock index modeled on the S&P/TSX 60. It consists

of companies which pass a set of broadly based environmental, social and governance rating criteria.

For further information please contact:

Indi Gopinathan, VP, Investor Relations & Corporate Communications, IAMGOLD Corporation

Tel: (416) 360-4743 Mobile: (416) 388-6883

Philip Rabenok, Manager, Investor Relations, IAMGOLD Corporation

Tel: (416) 933-5783 Mobile: (647) 967-9942

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.

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

https://www.iamgold.com/French/accueil/default.aspx.