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Iamgold Reports Third Quarter 2021 Results

Financials

NEWS RELEASE

TSX: IMG NYSE: IAG

IAMGOLD REPORTS THIRD QUARTER 2021 RESULTS

All monetary amounts are expressed in U.S. dollars, unless otherwise indicated.

For more information, refer to the management discussion and analysis ("MD&A") and unaudited consolidated

interim financial statements as at and for the three and nine months ended September 30, 2021.

HIGHLIGHTS:

• Attributable production of 448,000 ounces YTD 2021

• Mine-site free cash flow of $121.6 million and adjusted EBITDA of $265.7 million YTD 2021

• Q3 2021 adjusted net loss of $20.1 million or $0.04 per share attributable to equity holders

• Total available liquidity of $1.2 billion, including $748.3 million in cash and equivalents

• Côté Gold 36% complete; project remains on track for commercial production in H2 -2023

• Commitment to achieve net negative GHG emissions by no later than by 2050

Toronto, Ontario, November 3, 2021 – IAMGOLD Corporation (“IAMGOLD” or the “Company”) reports its

consolidated financial and operating results for the three and nine months ended September 30, 2021.

Preliminary operating results for the third quarter of 2021 were disclosed on October 18, 2021. Key highlights

of operating performance and financial results include:

($ millions, except where noted) Q3 2021 Q2 2021 YTD 2021

Revenues $ 294.1 $ 265.6 $ 857.1

Gross profit $ 6.9 $ 27.9 $ 79.0

EBITDA1 $ 19.6 $ 87.0 $ 220.5

Adjusted EBITDA1 $ 82.5 $ 83.0 $ 265.7

Net earnings (loss) attributable to equity holders $ (75.3) $ (4.5) $ (60.3)

Net earnings (loss) per share attributable to equity holders $ (0.16) $ (0.01) $ (0.13)

Adjusted net earnings (loss) attributable to equity holders1 $ (20.1) $ (3.6) $ (17.5)

Adjusted net earnings (loss) per share attributable to equity holders1 $ (0.04) $ (0.01) $ (0.04)

Net cash from operating activities $ 78.5 $ 37.3 $ 217.5

Net cash from operating activities before changes in working capital1 $ 79.6 $ 54.9 $ 217.0

Mine-site free cash flow1 $ 31.9 $ 1.9 $ 121.6

Capital expenditures – sustaining $ 26.4 $ 23.9 $ 64.0

Capital expenditures – expansion $ 113.0 $ 128.4 $ 330.2

Q3 2021 Q2 2021 Q1 2021

Cash, cash equivalents and short-term investments $ 748.3 $ 829.8 $ 967.8

Long-term debt $ 466.8 $ 456.5 $ 466.7

Available credit facility $ 498.3 $ 498.2 $ 498.2

1 This is a non-GAAP performance measure. See "Non-GAAP Performance Measures".

Gordon Stothart, President and CEO of IAMGOLD commented, “The third quarter of 2021 saw improvement

in our operating performance supported by the continued strong results at Essakane. Rosebel performed in

line with the revised plan. Construction activities at Côté continue to proceed well, reaching 36% project

completion at quarter end . First steel installation of the plant building commenced in mid-October, and the

project remains on track for commercial production in the second half of 2023.”

“A significant exploration milestone was achieved at Gosselin, located immediately to the northeast of Côté

Gold. In October we published an initial minera l resources estimate of 3.4 million ounces in indicated and

1.7 million ounces in inferred categories, further enhancing the long -term value and district -scale potential

of Côté. As part of our Zero Harm ® vision, we were also very pleased to announce our g reenhouse gas

initiative with a commitment to achieve net negative emissions by no later than 2050.”

2

COMPANY UPDATES

Environmental, Social and Governance

• DARTFR2 and TRIFR2 of 0.38 and 0.74, respectively, YTD 2021 tracking below the global annual targets

of 0.51 and 0.85, respectively. Côté Gold surpassed 2.9 million hours and 1,100 days without a lost time

injury since October 2018.

• The previously implemented COVID-19 protocols remain in place at our sites.

• At Boto, the Company continued with the im plementation of its sustainability strategy, focusing on the

improvement of water availability and distribution, sanitation, the fight against malaria with a focus on

women and children and the enhancement of local health centers capacities.

• In partnership with Giants of Africa, the Company is investing $950,000 in a 4 -year program, starting in

2021, aimed at encouraging the development of youth through sports. The joint project implementation

has started with the completion and unveiling of a new basketbal l court at the City Youth Center in

Ouagadougou, Burkina Faso, in October 2021.

• Kevin O’Kane and Dr. Ann K. Masse, Ph.D., were appointed as independent directors of the Company,

continuing with our board renewal in accordance with guidelines set out at t he beginning of 2021.

• The Company has published its 2020 Sustainability Report in accordance with the Global Reporting

Initiative and Sustainability Accounting Standards Board reporting standards.

• The Company separately published its climate change policy committing to achieve net negative

emissions by no later than 2050 and net positive biodiversity on a company-wide basis. A more detailed

roadmap and interim targets will be published in an upcoming report in late 2022.

• As part of its accountability and r eporting framework, IAMGOLD has also committed to report in

accordance with the Task Force on Climate -Related Financial Disclosures ("TCFD") guidelines, and

expects to release its initial TCFD report by the end of 2022.

OPERATING PERFORMANCE AND FINANCIAL POSITION

Q3 2021 YTD 2021 YTD 2020

Gold production – attributable (000s oz) 153 448 484

Gold sales – attributable (000s oz) 150 438 474

Average realized gold price ($/oz) $ 1,787 $ 1,788 $ 1,747

Mine-site free cash flow1 ($ million) $ 31.9 $ 121.6 $ 145.5

1 This is a non-GAAP performance measure. See "Non-GAAP Performance Measures".

• Mine-site free cash flow totaled $121.6 million for the nine months ended September 30, 2021.

• Cash, cash equivalents and short-term investments totaled $748.3 million and available liquidity totaled

$1.2 billion at September 30, 2021, including $498.3 million available under the Company's secured

revolving credit facility.

• On October 29, 2021, Moody's Investors Service downgraded the Company's long-term corporate credit

rating to B2 from B1 with a stable outlook.

3

OPERATIONS AND PROJECTS

Essakane District, Burkina Faso – Essakane Mine (IAMGOLD interest – 90%)1

Q3 2021 Q2 2021 Q3 2020 YTD 2021 YTD 2020

Key Operating Statistics

Ore mined (000s t) 3,908 3,559 4,282 11,902 12,052

Waste mined (000s t) 11,335 11,730 10,334 33,502 29,663

Material mined (000s t) – total 15,243 15,289 14,616 45,404 41,715

Strip ratio2 2.9 3.3 2.4 2.8 2.5

Ore milled (000s t) 3,298 3,169 3,014 9,656 9,173

Head grade (g/t) 1.33 1.44 1.26 1.37 1.12

Recovery (%) 83 81 85 82 88

Gold production (000s oz) – 100% 118 118 104 349 290

Gold production (000s oz) – attributable 90% 106 106 94 314 261

Gold sales (000s oz) – 100% 122 115 112 351 284

Average realized gold price3 ($/oz) $ 1,790 $ 1,801 $ 1,906 $ 1,794 $ 1,762

Financial Results ($ millions)1

Revenue4 $ 217.4 $ 208.2 $ 214.1 $ 629.7 $ 500.7

Operating costs (95.5) (92.3) (94.6) (284.5) (240.3)

Royalties (10.9) (10.5) (10.9) (31.5) (25.9)

Cash costs3 $ (106.4) $ (102.8) $ (105.5) $ (316.0) $ (266.2)

Other mine costs (5.9) (6.6) (12.2) (19.5) (27.7)

Cost of sales4 $ (112.3) $ (109.4) $ (117.7) $ (335.5) $ (293.9)

Sustaining capital expenditures5 (11.6) (11.3) (6.1) (28.3) (20.6)

Other costs6 (1.5) (1.7) 5.7 (4.9) 9.3

All-in sustaining costs3 $ (125.4) $ (122.4) $ (118.1) $ (368.7) $ (305.2)

Expansion capital expenditures7 $ (27.2) $ (18.6) $ (16.6) $ (60.3) $ (55.7)

Performance Measures8

Cost of sales ($/oz sold) $ 925 $ 947 $ 1,050 $ 956 $ 1,036

Cash costs3 ($/oz sold) $ 878 $ 890 $ 941 $ 901 $ 938

All-in sustaining costs3 ($/oz sold) $ 1,033 $ 1,060 $ 1,054 $ 1,051 $ 1,076

1 100% basis, unless otherwise stated.

2 Strip ratio is calculated as waste mined divided by ore mined.

3 This is a non-GAAP performance measure. See "Non-GAAP Performance Measures".

4 As per note 28 of the consolidated interim financial statements for revenue and cost of sales. Cost of sales is net of deprec iation expense.

5 Includes sustaining capitalized stripping for the third quarter 2021 of $1.0 million (second quarter 2021 - $nil, third quarter 2020 - $nil) and YTD 2021

of $1.0 million (YTD 2020 - $nil)

6 Other costs include sustaining lease principal payments, environmental rehabilitation accretion and depletion, and prior period operating costs, partially

offset by by-product credits.

7 Includes expansion capitalized stripping for the third quarter 2021 of $21.8 million (second quarter 2021 - $12.9 million, third quarter 2020 - $12.6

million) and YTD 2021 of $43.9 million (YTD 2020 - $42.2 million).

8 Cost of sales, cash costs and all-in sustaining costs per ounce sold may not be calculated based on amounts presented in this table due to rounding.

Essakane continued to deliver strong results and achieved attributable gold production of 106,000 ounces,

in line with the prior quarter, as increased throughput and improved recoveries offset the impact of planned

lower grades.

Mining activity of 15.2 million tonnes was in line with the prior quarter. Operational efficiencies continued to

be achieved from the modifications to the hauling flee t as noted in the previous quarter, with an increased

focus on stripping campaigns in the upper benches. The strip ratio of 2.9 was lower by 12% compared with

the prior quarter and higher by 21% compared with the same prior year period.

Mill throughput of 3.3 million tonnes was higher by 4% compared with the prior quarter and higher by 9%

compared with Q3 2020, benefiting from the positive results of the mill debottlenecking project as hard rock

feed and plant availability exceeded 90%. In -circuit gold inve ntory reduced during the quarter resulting in

higher gold sales when compared with production.

4

The Company reported on certain security incidents during the quarter and subsequent to the quarter (see

news releases dated September 1, 2021, October 29, 2021 and November 1, 2021). The Company

continues to assess the security situation and make appropriate precautionary adaptations. Logistics of

materials, supplies and gold shipments are being managed and have not been materially impacted to date.

However, the Company does note that the security situation has notably deteriorated recently. The Company

also continues to engage with the relevant authorities and other partners in Burkina Faso in connection with

security in the region around Essakane and its supplies and transportation routes.

The COVID-19 situation at Essakane remains relatively stable. Approximately 60% of the workforce is fully

vaccinated.

Outlook

Essakane’s 2021 full year production is trending towards the upper end of the 390,000 to 400,000 ounc e

guidance range. Certain cost s pressures are expected to continue, including t ransportation and security

costs.

Bambouk District – Boto Gold Project, Senegal (IAMGOLD interest – 90%)

During the third quarter, planned capital expenditures for 2021 were further lowered from $60 million to

approximately $35 million by deferring certain previously planned de -risking activities. The scope for 2021

includes a preliminary work package for the completion of a road to provide permanent access to the site,

engineering for critical plant equipment and sustainability programs to promote cohesion with local

communities and ensure adequate environmental protections. The Company continues to evaluate the

project scope, the associated capital expenditures and timing, as we ll as potential value enhancing

alternatives for this project in general. Capital expenditures totaled $4.9 million in the third quarter and $27.6

million YTD 2021.

Abitibi District, Canada – Westwood Mine (IAMGOLD interest – 100%)

Q3 2021 Q2 2021 Q3 2020 YTD 2021 YTD 2020

Key Operating Statistics

Ore mined (000s t) – underground 31 14 123 45 330

Ore mined (000s t) – other sources 171 273 169 690 389

Ore mined (000s t) – total 202 287 292 735 719

Ore milled (000s t) 220 264 290 711 711

Head grade (g/t) – underground 4.17 4.50 4.66 4.26 5.27

Head grade (g/t) – other sources 0.59 0.74 1.09 0.82 1.06

Head grade (g/t) – total 1.11 0.92 2.64 1.03 3.01

Recovery (%) 92 93 94 93 94

Gold production (000s oz) – 100% 7 8 23 22 65

Gold sales (000s oz) – 100% 7 7 23 22 66

Average realized gold price1 ($/oz) $ 1,779 $ 1,810 $ 1,913 $ 1,790 $ 1,749

Financial Results ($ millions)

Revenue2 $ 12.7 $ 12.2 $ 44.8 $ 39.4 $ 116.8

Cash costs1 $ (24.6) $ (13.8) $ (28.5) $ (47.5) $ (73.6)

Other mine costs (0.1) (0.3) (3.6) (0.6) (5.1)

Cost of sales2 $ (24.7) $ (14.1) $ (32.1) $ (48.1) $ (78.7)

Sustaining capital expenditures (3.8) (2.1) (4.7) (6.3) (9.6)

Other costs3 (0.4) 0.1 1.7 (0.2) 2.5

All-in sustaining costs1 $ (28.9) $ (16.1) $ (35.1) $ (54.6) $ (85.8)

Expansion capital expenditures $ (0.8) $ (1.2) $ (3.2) $ (2.6) $ (7.6)

Performance Measures4

Cost of sales ($/oz sold) $ 3,512 $ 2,100 $ 1,387 $ 2,205 $ 1,197

Cash costs1 ($/oz sold) $ 3,482 $ 2,056 $ 1,229 $ 2,176 $ 1,119

All-in sustaining costs1 ($/oz sold) $ 4,087 $ 2,412 $ 1,515 $ 2,501 $ 1,304

1 This is a non-GAAP measure. See "Non-GAAP Performance Measures".

2 As per note 28 of the consolidated interim financial statements for revenue and cost of sales. Cost of sales is shown net of depreciation expense.

3 Other costs include sustaining lease principal payments and environmental rehabilitation accretion and depletion, partially offset by by-product credits.

4 Cost of sales, cash costs and all-in sustaining costs per ounce sold may not be calculated based on amounts presented in this table due to rounding.

5

Gold production in the third quarter of 7,000 ounces was 13% lower than in the prior quarter and 70% lower

than in Q3 2020. Although underground mine productivity is improving, production continues to be impacted

by labour shortages and turnover in addition to the impact of implementing additional safety measures. The

Company is using additional training, schedule changes and focused hiring activities to mitigate labour

market conditions and productivity rates.

Mill throughput was impacted by lower ore availability and an increase in the ratio of hard rock ore from the

Grand Duc pit. Potential solutions to improve processing of the hard rock ore from Grand Duc are being

investigated.

The estimated asset retirement obligation for Westwood, including the Doyon closed site, has increased by

$52.3 million due to an updated closure plan. Of that total, $11.9 million of the increase relates to Westwood

and was accounted for as an increase to Property, plant and equipment and $40.4 million relates to the

Doyon closed site and was accounted for as an increase to Other expenses.

The COVID-19 situation continues to be stable. Approximately 19% of the workforce has reported that it is

fully vaccinated.

Outlook

Underground development, rehabilitation and mining activities are ex pected to continue to ramp up in the

fourth quarter of 2021 as more mining areas become available in the underground mine. Underground

conditions in the West and Central Zones continue to remain under assessment. Based on information

currently available, management expects that mining in these zones will resume in the first half of 2022.

The Company is optimizing a short-term three year operating plan that is now expected to be released with

the Company's 2022 guidance. In addition, the Company is continuin g to evaluate this asset to identify the

optimal path forward for the Company and the site workforce.

Côté Gold Project (IAMGOLD interest – 64.75%)

On October 18, 2021, the Company provided a construction progress update at its Côté Gold Project, a tier

1 asset located in Ontario, Canada . Major earthworks, processing plant civil works and waste stripping

activities are progressing. The first ore blast was completed in October 2021 and first steel installation for

the plant building shell commenced in mid -October. As at September 30, 2021 the project was overall 36%

complete and detailed engineering was 85% complete. The project schedule remains on track for

commercial production in the second half of 2023.

Concurrently with the construction progress update, the Company reported an initial mineral resources

estimate for the Gosselin deposit, located immediately to the northeast of the Côté Gold deposit. The

Company intends to file a new technical report titled “Technical Report on the Côté Gold Project, Ontar io,

Canada” (the “2021 Technical Report”) prepared by SLR Consulting (Canada) Ltd. in accordance with

National Instrument 43 -101 Standards of Disclosure for Mineral Projects ("NI 43 -101"), including a

description of the Gosselin deposit mineral resources e stimate, by December 2, 2021. When filed with

applicable securities regulatory authorities, the new 2021 Technical Report will be the current NI 43 -101

technical report on Côté Gold and will replace prior filed technical reports.

The project operating metrics, outlined in the 2021 Technical Report, remain similar as previously announced

in the Company’s July 21, 2020 news release. Cash costs and all-in-sustaining costs per ounce of gold sold

have been estimated to increase to an average of approximately $659 and $802 per gold ounce sold ,

respectively, over the life -of-mine primarily due to the impact of recent inflation, including on operating

consumables. The Company’s remaining 70% share of Côté Gold project costs estimated from October 1,

2021 onwards is estimated at approximately $860 million to $910 million. Incurred and expended costs at

Côté Gold are summarized in the table below:

Q3 2021 YTD 2021 YTD 2020

Capital expenditures1 ($ millions) $ 67.3 $ 200.4 $ 14.4

Non-capital costs 4.3 11.3 0.1

Expended costs 71.6 211.7 14.5

Working capital adjustment2 51.1 80.6 3.3

Incurred costs $ 122.7 $ 292.3 $ 17.8

1 Capital expenditures prior to July 1, 2020 are not included in the Company’s portion of reported total project costs . Capital expenditures include the

positive impact of certain off -setting credits including realized derivative gains of $4.3 million in the third quarter and $11.4 million in the first nine

months of 2021.

2 Working capital adjustment mainly consists of wor k performed not yet invoiced combined with an increase in the accounts payable balance, offset

with an increase in sales taxes.

6

Rosebel District, Suriname – Rosebel Mine (IAMGOLD interest – 95%)1

Q3 2021 Q2 2021 Q3 2020 YTD 2021 YTD 2020

Key Operating Statistics

Ore mined2 (000s t) 1,432 1,102 923 3,781 5,045

Waste mined2 (000s t) 9,703 6,956 2,429 25,569 24,227

Material mined2 (000s t) – total 11,135 8,058 3,352 29,350 29,272

Strip ratio2,3 6.8 6.3 2.6 6.8 4.8

Ore milled (000s t) – Rosebel 1,719 1,412 1,774 4,771 6,668

Ore milled2 (000s t) – Saramacca 956 803 544 2,667 989

Ore milled2 (000s t) – total 2,675 2,215 2,318 7,438 7,657

Head grade2,4 (g/t) 0.68 0.52 0.79 0.67 0.79

Recovery2 (%) 82 83 88 84 92

Gold production2 (000s oz) – 100% 47 31 51 135 177

Gold production (000s oz) – owner operator 42 27 45 118 166

Gold production (000s oz) – attributable 95% 40 25 42 112 158

Gold sales (000s oz) – 100% 36 25 40 106 161

Average realized gold price5 ($/oz) $ 1,779 $ 1,793 $ 1,910 $ 1,770 $ 1,719

Financial Results ($ millions)1

Revenue6 $ 64.0 $ 45.2 $ 76.2 $ 188.0 $ 276.7

Operating costs $ (59.5) $ (40.4) $ (32.6) $ (150.0) $ (146.5)

Royalties (5.1) (3.9) (5.3) (14.5) (17.0)

Cash costs5,7 $ (64.6) $ (44.3) $ (37.9) $ (164.5) $ (163.5)

Other mine costs (0.5) (0.2) (4.0) (1.2) (4.7)

Cost of sales6 $ (65.1) $ (44.5) $ (41.9) $ (165.7) $ (168.2)

Sustaining capital expenditures (10.8) (10.5) (5.5) (28.9) (21.2)

Other costs8 (1.6) (1.4) 0.7 (4.6) (2.8)

All-in sustaining costs5 $ (77.5) $ (56.4) $ (46.7) $ (199.2) $ (192.2)

Expansion capital expenditures9 $ (12.8) $ (15.7) $ (5.8) $ (39.3) $ (26.2)

Performance Measures10

Cost of sales ($/oz sold) $ 1,808 $ 1,767 $ 1,049 $ 1,559 $ 1,045

Cash costs5 ($/oz sold) $ 1,796 $ 1,755 $ 952 $ 1,548 $ 1,016

All-in sustaining costs5 ($/oz sold) $ 2,156 $ 2,237 $ 1,164 $ 1,875 $ 1,194

1 Rosebel at 100% and Saramacca at 70% from April 1, 2020, as included in the consolidated interim financial statements, unless otherwise stated.

2 Includes Saramacca at 100%.

3 Strip ratio is calculated as waste mined divided by ore mined.

4 Includes head grade / tonne for the third quarter 2021 related to the Rosebel concession of 0.64 g/t and the Saramacca concession of 0.76 g/t (second

quarter 2021 - 0.48 g/t and 0.58 g/t respectively, thir d quarter 2020 – 0.58 g/t and 1.46 g/t, respectively) and YTD 2021 of 0.58 g/t and 0.82 g/t

respectively (YTD 2020 - 0.69 g/t and 1.43 g/t, respectively).

5 This is a non-GAAP performance measure. See "Non-GAAP Performance Measures".

6 As per note 28 of the consolidated interim financial statements for revenue and cost of sales. Cost of sales is net of depreciation expense.

7 Cash costs includes by-product credit.

8 Other costs include sustaining lease principal payments and environmental rehabilitation accretion and depletion, partially offset by by-product credits.

9 Includes expansion capitalized stripping for the third quarter 2021 of $8.4 million (second quarter 2021 - $7.6 million, third quarter 2020 - $0.9 million)

and YTD 2021 of $23.3 million (YTD 2020 - $7.6 million).

10 Cost of sales, cash costs and all-in sustaining costs per ounce sold may not be calculated based on amounts presented in this table due to rounding.

Rosebel achieved attributable gold production of 40,000 ounces in the third quarter, 60% higher than in the

prior quarter and 5% lower than in Q3 2020.

The situation in Suriname and at site relating to COVID -19 continues to be fragile. Workforce productivity

levels have been adversely impacted which has resulted in the overall reduced activity levels at Rosebel

throughout the year. The site continues to monitor and implement mitigating measures to reduce the impact.

The construction of the additional rooms at the campsite is complete. Approximately 24% of the workforce

is now fully vaccinated.

Mine produc tion ramped up during the third quarter 2021 as the pit conditions, after the rainy season ,

improved. This also allowed access to slightly higher grade ore at the Saramacca deposit and for the ramp

up of strategic pushbacks including waste stripping.

7

The Company continues to collaborate with a government task force and with local communities in an effort

to reduce pit intrusions by small scale miners. Intrusions continued throughout the quarter diminishing

productivity and restricting access to higher grade ore due to frequent mobilization and demobilization of

mining equipment and personnel.

The backlog in maintenance work on the mining fleet and the resulting lower equipment availability and

reliability continued to be of concern during the third quarter 2021. Deliveries of new mobile equipment aimed

at improving availability have commenced.

During the quarter, Rosebel provided 21% of the mill feed at an average grade of 0.64 g/t and Saramacca

provided 36% of the mill feed at an average grade of 0.76 g/t. T he remaining 43% mill feed was from low

grade long term stockpiles.

Mill performance in the quarter increased and achieved the highest throughput level since the start of the

pandemic. The mechanical condition of the gravity and leach/CIP circuits continu es to negatively impact

recoveries and is resulting in higher than normal levels of in -circuit gold inventory. The project to improve

efficiency of the carbon adsorption/desorption circuit is expected to be completed by the end of the year and

the resulting increase in recoveries and lower in-circuit gold inventory levels are expected to be realized from

2022 onwards.

The construction of required infrastructure at the Saramacca project , including the facility pad, the

sedimentation dams, haul road, and public road crossings, as well as all previously planned activities related

to the West Dump rock drains are expected to be completed in the fourth quarter of 2021. Additionally, the

dewatering wells, further development of the rock drains and completion of ot her earthworks activities,

including slope remediation and bypass road phase 2, are expected to be completed during 2022.

Outlook

Rosebel's 2021 attributable production guidance is expected to be within the 140,000 to 160,000 ounce

guidance range. The adsorption/desorption circuit project is expected to improve recoveries once completed.

The Company has been working on a revised geological model for the Rosebel and Saramacca deposits to

support the completion of an updated mineral reserves and resources estimate which is now expected to be

released in the first quarter of 2022. Based on currently available information and given the negative impact

of certain factors including higher costs , mineral reserves may decrease and mineral resources will likely

decrease by more than depletion.

OUTLOOK

Total attributable production for the third quarter totaled 153,000 ounces and 448,000 ounces YTD 2021.

Total per-ounce cost of sales, cash costs and all-in sustaining costs per ounce sold are expected within the

guidance range updated in July 2021 although pressure on certain costs is expected to continue . These

include logistics (as a result of bottlenecks in global shipping and transportation systems), consumables

including fuel (as a result of increases in oil and natural gas prices) and shipping containers and spare parts

(as a result of an increase in steel prices).

Actual

YTD 2021

Full Year

Guidance 20211

Essakane (000s oz) 314 390-400

Rosebel (000s oz) 112 140-160

Westwood (000s oz) 22 35-45

Total attributable production (000s oz)2 448 565-605

Cost of sales2 ($/oz sold) $ 1,157 $1,155-$1,190

Cash costs2,3 ($/oz sold) $ 1,114 $1,115- $1,150

All-in sustaining costs2,3 ($/oz sold) $ 1,387 $1,395- $1,435

Depreciation expense ($ millions) $ 228.8 $295 - $305

Income taxes paid4 ($ millions) $ 37.9 $45 - $55

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

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

2 Consists of Essakane, Rosebel and Westwood on an attributable basis of 90%, 95% and 100%, respectively.

3 This is a non-GAAP performance measure. See "Non-GAAP Performance Measures".

4 Cash tax payments do not occur evenly by quarter, because payments reflect final payments in respect of the prior year and installments due at

different prescribed times for different countries.

8

Capital Expenditures1

Total capital expenditures for 2021 at our operations are expected to be lower than the full year guidance of

$260 million primarily relating to the timing of spending on various capital improvements. Capital

expenditures for Côté Gold for 2021 are expected to be approximately $350 million.

Actual YTD 2021 Full Year Guidance 2021

($ millions) Sustaining2 Expansion3 Total Sustaining2 Expansion3 Total

Essakane $ 28.3 $ 60.3 $ 88.6 $ 45 $ 95 $ 140

Rosebel4 28.9 39.3 68.2 40 60 100

Westwood 6.3 2.6 8.9 15 5 20

63.5 102.2 165.7 100 160 260

Côté Gold (70%)5 — 200.4 200.4 — 430 430

Boto Gold — 27.6 27.6 — 55 55

Corporate 0.5 — 0.5 — — —

Total6,7,8 (±5%) $ 64.0 $ 330.2 $ 394.2 $ 100 $ 645 $ 745

1 100% basis, unless otherwise stated.

2 Sustaining capital includes capitalized stripping at Essakane of (i) $1 million YTD 2021, and (ii) $nil for the full year 202 1 guidance.

3 Expansion capital includes capitalized stripping of (i) $43.9 million for Essakane and $23.3 million for Rosebel YTD 2021, and (ii) $70 million for

Essakane and $30 million for Rosebel for the full year 2021 guidance.

4 Rosebel includes Saramacca at 70%.

5 In addition to the capital expenditures estimated for Côté Gold, the Company expects to spend an additional approximately $15 million in non-capital

costs for 2021.

6 Includes $13 million of capitalized exploration and evaluation expenditures also included in the Exploration Outlook guidance table.

7 Capitalized borrowing costs are not included.

8 In addition to the above capital expenditures, $21 million in total principal lease payments are expected.

Exploration

YTD 2021 expenditures for exploration and project studies totaled $36.2 million of which $28.6 million was

expensed and $7.6 million was capitalized. Exploration expenditures for 2021 are expected to be lower than

the full year guidance of $56 million due to reduced activities.

Conference Call

A conference call will be held on Thursday, November 4, 2021 at 8:30 a.m. (Eastern Time) for a discussion

with management regarding IAMGOLD's operating performance and financial results for the third quarter

2021. A webcast of the conference call will be available through IAMGOLD'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: 7829#.

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End Notes (excluding tables)

1 This is a non -GAAP performance measure. See "Non -GAAP Performance Measures" and in the Company's second quarter Management Discussion

and Analysis.

2 DARTFR (days away, restricted, transferred duty incident frequency rate) and TRIFR (total recordable injuries incident frequency rate) are per 200,000

hours worked.

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

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