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Iamgold Reports Third Quarter 2018 Results - Confirms Corporate Guidance - and Updates Growth Projects Showing Higher Expected Returns

Financials Exploration Programs

TSX: IMG NYSE: IAG

NEWS RELEASE

IAMGOLD REPORTS THIRD QUARTER 2018 RESULTS -

CONFIRMS CORPORATE GUIDANCE -

AND UPDATES GROWTH PROJECTS SHOWING HIGHER EXPECTED RETURNS

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 for the nine months ended September 30, 2018.

Toronto, Ontario, November 6, 2018 - IAMGOLD Corporation (“IAMGOLD” or the “Company”) reported

its consolidated financial and operating results for the quarter ended September 3 0, 2018.

Commented Steve Letwin, President and CEO of IAMGOLD, “We maintain our full-year 2018 guidance for

production of 850,000 to 900,000 attributable ounces and guidance for cost of sales of $765 to $815 per

ounce, total cash costs of $750 to $800 per ounce produced, and all-in sustaining costs of $990 to $1,070

per ounce sold. As anticipated, the third quarter was weaker than the first half of the year with the gold

margin under pressure and production at Rosebel on the lighter side. Our balance shee t remains strong,

reserves continue to grow and our development projects are looking more robust than ever. The

declaration of reserves at Saramacca, with the grade nearly double that of Rosebel's, drove Rosebel's

reserves up 51% adding five years to the life of the mine. At Essakane, we are evaluating an opportunity to

add incremental ounces by optimizing mill performance. Shifting Heap Leach construction until closer to

the end of Essakane's life would free up capital for other high-value growth projects. Recent feasibility

study results for the Côté Gold and Boto Gold projects showed increased reserves and significant

improvements in project economics compared to earlier studies. Our ability to add significant value through

exploration continues, with recent positive results from Nelligan and Diakha.”

Third Quarter 2018 Highlights

Maintains Total 2018 Production and Cost Guidance

Operating Performance

• Attributable gold production of 208,000 oz, down 9,000 oz from Q3/17.

• Attributable gold sales of 202,000 oz, down 8,000 oz from Q3/17.

• Cost of sales1 of $858/oz sold, up $63/oz from Q3/17.

• All-in sustaining costs2 of $1,086/oz sold, up $117/oz from Q3/17.

• Total cash costs2 of $830/oz produced, up $59/oz from Q3/17.

• Gold margin2 of $377/oz, down $136/oz from Q3/17.

• Capital expenditure guidance for 2018 reduced by $20 million to $305 million (±5%); updated

guidance primarily reflects the deferral of spending for the Saramacca Project, although the

completion date for the Project remains unchanged. Other factors include the evaluation of

alternative cost effective methods for expanding production at Essakane, and reduced spending on

the Sadiola Sulphide Project.

• On September 14, 2018, a new two-year Collective Labour Agreement was finalized at Rosebel,

and on September 20, 2018, union members at Westwood voted favourably on a new five -year

Collective Labour Agreement.

Financial Results

• Revenues of $244.8 million, down $24.0 million from Q3/17.

• Gross profit of $7.5 million, down $33.4 million from Q3/17.

• Net loss attributable to equity holders of $9.5 million, or $0.02 per share; compared to net earnings

of $30.8 million, or $0.07 per share in Q3/17.

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• Adjusted net loss attributable to equity holders2 of $6.9 million, or $0.01 per share2; compared to

adjusted net earnings2 of $33.7 million, or $0.07 per share2 in Q3/17.

• Net cash from operating activities of $11.4 million, down $65.6 million from Q3/17.

• Net cash from operating activities before changes in working capital 2 of $39.7 million, down $33.8

million from Q3/17.

• Cash, cash equivalents, short-term investments primarily in money market funds, and restricted

cash of $744.5 million at September 30, 2018.

• Moody's Investors Service upgraded IAMGOLD's long-term corporate credit rating to Ba3 from B1

with a stable outlook.

Strategic Developments

• On September 23, 2018, we reported a 51% increase in reserves at Rosebel, with Saramacca

accounting for nearly two-thirds of the 1.6 million-ounce increase on an attributable basis.

Compared to the previously disclosed mine plan, once Saramacca is in or close to full production

Rosebel’s average annual attributable production is expected to increase by 11% to 295,000

ounces from 2020 to 2032, with Rosebel’s mine life extended by five years to 2033.

• On September 11, 2018, we reported drilling results that continue to intersect wide zones of

mineralization at our Nelligan Gold Project. Highlights included 56.6 metres grading 1.81 g/t Au,

including 30.8 metres grading 2.66 g/t Au; 23.1 metres grading 2.59 g/t Au; and 66.3 metres

grading 1.18 g/t Au.

• IAMGOLD is in advanced discussions with a syndicate of lenders to increase the existing credit

facility from $250 million to $500 million to provide additional financial flexibility as it executes its

growth strategy. The facility is expected to close before the end of 2018.

Subsequent to Quarter-End

• On November 1, 2018, we announced positive feasibility study results for the Côté Gold Project,

which demonstrated significant economic and operational improvements compared with the

previously filed pre-feasibility study, including an attractive extended reserves scenario. On a

100% basis, total proven and probable reserves increased by 23% to 7.3 million ounces,

measured and indicated resources (including reserves) increased by 24% to app roximately 10.0

million ounces, and inferred resources increased by 97% to 2.4 million ounces. The Base Case

Mine Plan, supported by 88% of the mineral reserves, demonstrated a 16 -year mine life with

average annual production of 367,000 ounces (Years 1-12: averaging 428,000 ounces annually),

life-of-mine average total cash costs of $594 per ounce and all-in sustaining costs of $694 per

ounce. After-tax net present value increased by 13% to $795 million at a 5% discount rate, with an

after-tax internal rate of return of 15.2%. The Extended Mine Plan, supported by total mineral

reserves, demonstrated an 18-year mine life, with a 29% increase in the net present value to $905

million, at a 5% discount rate, and a 15.4% after-tax internal rate of return.

• On October 22, 2018, we announced positive feasibility study results for the Boto Gold Project,

which demonstrated significant economic and operational improvements compared with the

previously filed pre-feasibility study. Highlights included a 0.5 million-ounce increase in reserves

(100% basis) to 1.9 million ounces; a mine life of 12.8 years with average annual production of

140,000 ounces, and life-of-mine average total cash costs of $714 per ounce and all-in sustaining

costs of $753 per ounce. Net present value, at a 6% discount rate, increased by 151% to $261

million, with an after-tax internal rate of return of 23% and a 3.4 year payback period.

• On October 18, 2018, we reported further high-grade intersections from infill and expansion drilling

at our Siribaya Project’s Diakha deposit. Highlights included 13.0 metres grading 6.05 g/t Au; 22.0

metres grading 2.96 g/t Au; 13.0 metres grading 11.6 g/t Au; and, 52.0 metres grading 1.61 g/t Au.

Upcoming Growth Catalysts

• Oxygen plant at Essakane, which is designed to improve recoveries, is expected to be

commissioned in Q4/18.

• Initial resource estimate for the Gossey satellite prospect at Essakane is expected in Q4/18.

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• Expect to receive a $95 million final cash payment from Sumitomo Metal Mining Co., Ltd. by end of

2018 pursuant to the sale of a 30% interest in the Côté Gold Project in June 2017.

• Application for the mining concession for the Boto Gold Project is expected to be approved by the

Government of Senegal in H1/19. An investment decision would follow as part of our overall

growth and capital strategy.

• Due to encouraging drill results, the feasibility study for the Heap Leach Project at Essakane was

refocused on optimizing the performance of the carbon-in-leach ("CIL") mill. The construction of

the heap leach facility has been deferred to the end of the CIL operations. This is a lower capital

cost strategy and is expected to provide superior economic returns.

• Construction decision for the Côté Gold Project is expected in H1/19 with production expected to

begin in mid-2021.

• Production at Saramacca is expected to begin in H2/19.

• Westwood ramp-up to full production is expected in 2020.

• Advancing exploration along the Saramacca-Brokolonko trend to confirm the presence of

mineralization and evaluate the resource potential.

SUMMARY OF FINANCIAL AND OPERATING RESULTS

Three months ended

September 30,

Nine months ended

September 30,

Financial Results ($ millions, except where noted) 2018 2017 2018 2017

Revenues $ 244.8 $ 268.8 $ 836.7 $ 803.8

Cost of sales $ 237.3 $ 227.9 $ 723.8 $ 692.0

Gross profit $ 7.5 $ 40.9 $ 112.9 $ 111.8

Net earnings (loss) attributable to equity holders of IAMGOLD $ (9.5 ) $ 30.8 $ 6.6 $ 519.3

Net earnings (loss) attributable to equity holders ($/share) $ (0.02 ) $ 0.07 $ 0.01 $ 1.12

Adjusted net earnings (loss) attributable to equity holders of

IAMGOLD1 $ (6.9 ) $ 33.7

$ 45.9

$ 43.1

Adjusted net earnings (loss) attributable to equity holders

($/share)1 $ (0.01 ) $ 0.07

$ 0.10

$ 0.09

Net cash from operating activities $ 11.4 $ 77.0 $ 168.0 $ 230.1

Net cash from operating activities before changes in working

capital1 $ 39.7

$ 73.5

$ 232.7

$ 225.8

Key Operating Statistics

Gold sales – attributable (000s oz) 202 210 652 641

Gold production – attributable (000s oz) 208 217 651 654

Average realized gold price1 ($/oz) $ 1,207 $ 1,284 $ 1,282 $ 1,255

Cost of sales2 ($/oz) $ 858 $ 795 $ 805 $ 777

Total cash costs1 ($/oz) $ 830 $ 771 $ 791 $ 757

All-in sustaining costs1 ($/oz) $ 1,086 $ 969 $ 1,035 $ 978

Gold margin1 ($/oz) $ 377 $ 513 $ 491 $ 498

1 This is a non-GAAP measure. Refer to the non-GAAP performance measures section of the MD&A.

2 Cost of sales, excluding depreciation, as disclosed in note 31 of the Company's consolidated interim financial statements is on an attributable ounce

sold basis (excluding the non-controlling interests of 10% at Essakane and 5% at Rosebel) and does not include Joint Ventures which are accounted

for on an equity basis.

THIRD QUARTER 2018 SUMMARY

Financial Performance

• Revenues for the third quarter 2018 were $244.8 million, down $24.0 million from the same prior year

period. The decrease was primarily due to a lower realized gold price ($15.6 million), and lower sales

volume at Rosebel ($14.6 million) and Westwood ($1.6 million), partially offset by higher sales volume

at Essakane ($7.6 million).

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• Cost of sales for the third quarter 2018 was $237.3 million, up $9.4 million from the same prior year

period. The increase was due to higher operating costs ($8.0 million) and higher depreciation expense

($2.3 million), partially offset by lower royalties ($0.9 million). Operating costs were higher primarily

due to increased maintenance and contractor costs resulting from higher mine production at

Essakane, increased preventative maintenance at Rosebel, lump sum payments at Rosebel and

Westwood pursuant to new Collective Labour Agreements, and higher energy costs, partially offset by

higher capitalized stripping at Essakane, and a stronger U.S. dollar relative to the euro and the

Canadian dollar.

• Depreciation expense for the third quarter 2018 was $64.6 million, up $2.3 million from the same prior

year period. The increase was primarily due to higher depreciation of capital spares, and higher

depreciation of capitalized stripping as Essakane and Rosebel reached ore zones in previously

capitalized phases, partially offset by an increase in reserves at Essakane and Rosebel.

• Income tax expense for the third quarter 2018 was $0.5 million, down $4.6 million from the same prior

year period. Income tax expense for the third quarter 2018 comprised current income tax expense of

$24.7 million (Q3/17 - $11.1 million) and deferred income tax recovery of $24.2 million (Q3/17 - $6.0

million). The decrease in income tax expense was primarily due to changes to deferred income tax

assets and liabilities, differences in the impact of fluctuations in foreign exchange, and differences in

the level of taxable income in IAMGOLD's operating jurisdictions from one period to the next.

• Net loss attributable to equity holders for the third quarter 2018 was $9.5 million, or $0.02 per share

compared to net earnings of $30.8 million, or $0.07 per share in the same prior year period. The

decrease was primarily due to lower gross profit ($33.4 million), lower interest income, derivatives and

other investment gains (losses) ($8.1 million), higher general and administrative expenses ($1.9

million) and exploration expenses ($1.8 million), partially offset by lower income taxes ($4.6 million).

• Adjusted net loss attributable to equity holders2 for the third quarter 2018 was $6.9 million, or $0.01 per

share2,compared to adjusted net earnings2 of $33.7 million, or $0.07 per share2 from the same prior

year period.

• Net cash from operating activities for the third quarter 2018 was $11.4 million, down $65.6 million from

the same prior year period. The decrease was primarily due to lower earnings after non -cash

adjustments ($32.3 million) and changes in movements in non-cash working capital items and non-

current ore stockpiles ($31.8 million), partially offset by higher net settlement of derivatives ($3.5

million).

• Net cash from operating activities before changes in working capital 2 for the third quarter 2018 was

$39.7 million, down $33.8 million from the same prior year period.

Financial Position

• We ended the third quarter in a strong financial position, with cash, cash equivalents, short -term

investments primarily in money market funds, and restricted cash of $744.5 millio n at September 30,

2018. The $71.3 million decrease from December 31, 2017 was primarily due to spending on property,

plant and equipment ($172.8 million) and exploration and evaluation assets ($31.9 million), interest

paid ($14.3 million), and other investing activities ($19.3 million), partially offset by cash generated

from operating activities ($168.0 million).

Production and Costs

• Attributable gold production, inclusive of joint venture operations, was 208,000 ounces for the third

quarter 2018, down 9,000 ounces from the same prior year period. The decrease was due to lower

throughput and head grades at Rosebel (8,000 ounces) and Westwood (3,000 ounces), and lower

head grades at the Joint Ventures (1,000 ounces), partially offset by higher head grades at Essakane

(3,000 ounces).

• Attributable gold sales, inclusive of joint venture operations, were 202,000 ounces for the third quarter

2018, down 8,000 ounces from the same prior year period. The decrease was due to lower sales at

Rosebel (11,000 ounces) and Westwood (1,000 ounces), partially offset by higher sales at Essakane

(4,000 ounces).

• Cost of sales1 per ounce for the third quarter 2018 was $858, up 8% from the same prior year period.

The increase was primarily due to lower sales volume at Rosebel, increased maintenance and

contractor costs resulting from higher mine production at Essakane, increased preventative

maintenance at Rosebel, lump sum payments at Rosebel and Westwood pursuant to new Collective

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Labour Agreements, and higher energy costs, partially offset by higher capitalized stripping at

Essakane, and a stronger U.S. dollar relative to the euro and the Canadian dollar.

• Total cash costs2 per ounce produced for the third quarter 2018 were $830, up 8% from the same prior

year period. The increase was primarily due to lower production volume at Rosebel and the factors

noted above.

• All-in sustaining costs2 per ounce sold for the third quarter 2018 were $1,086, up 12% from the same

prior year period. The increase was primarily due to higher cost of sales per ounce and higher

sustaining capital expenditures.

• Total cash costs2 and all-in sustaining costs2 for the third quarter 2018 included realized derivative

gains from hedging programs of $13 per ounce produced and $13 per ounce sold, respectively ( Q3/17

- $7 and $10).

2018 Guidance

(Refer to MD&A for more detail)

• While total production guidance for 2018 is maintained at 850,000 to 900,000 attributable ounces, we

have revised the allocation. Essakane's attributable production guidance was revised to 390,000 to

405,000 ounces compared to the previously disclosed guidance of 380,000 to 395,000 ounces. The

increase reflects higher throughput benefiting from increased mill availability relative to the initial plan

for the year. Rosebel's attributable production guidance was revised to 280,000 to 295,000 ounces

compared to the previously disclosed guidance of 295,000 to 310,000 ounces. The decrease at

Rosebel reflects lower mining tonnages and head grades in the third quarter 2018. Attributable

production guidance for Sadiola was revised to 55,000 to 65,000 ounces compared to the previously

disclosed guidance of 50,000 to 60,000 ounces. We maintain 2018 guidance for cost of sales 1 per

ounce of $765 to $815, total cash costs2 per ounce produced of $750 to $800, and all-in sustaining

costs2 per ounce sold of $990 to $1,070.

• Capital expenditure guidance for 2018 has been reduced by $20 million to $305 million (±5%). This is

the result of a reduction in non-sustaining capital expenditures from $165 million in the previously

disclosed guidance to $145 million. The decrease relates to a $10 million reduction at Rosebel, a $5

million reduction at Essakane, and a $5 million reduction at Sadiola. The reduction at Rosebel

primarily relates to the deferral of spending for the Saramacca Project based on final engineering

work, lower spending on indirect costs and the removal of the 2018 cost contingency. The completion

date for the Saramacca Project remains unchanged. The reduction at Essakane reflects the evaluation

of alternative cost effective methods to expand production with a shift in timing of the Heap Leach

Project. The $5 million decrease at Sadiola reflects decreased spending on the Sadiola Sulphide

Project, as an agreement with the Government of Mali regarding terms critical to moving the Project

forward has not been reached.

Commitment to Zero Harm Continues

• The DART rate3, representing the frequency of all types of serious injuries across all sites and

functional areas for the third quarter 2018 was 0.65, above IAMGOLD's target of 0.50. Zero Harm

remains our number one priority. We are implementing a new behaviour-based safety program to

ensure a safer work environment.

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ATTRIBUTABLE GOLD PRODUCTION AND COSTS

Gold Production

(000s oz)

Cost of Sales1

($ per ounce)

Total Cash

Costs2

($ per ounce

produced)

All-in Sustaining

Costs2

($ per ounce

sold)

Three months ended September 30, 2018 2017 2018 2017 2018 2017 2018 2017

Owner-operator

Essakane (90%) 96 93 $ 809 $ 810 $ 762 $ 779 $ 993 $ 944

Rosebel (95%) 67 75 921 765 893 718 1,113 898

Westwood (100%)3 30 33 891 819 856 814 1,047 907

Owner-operator4 193 201 $ 858 $ 795 $ 822 $ 762 $ 1,099 $ 967

Joint Ventures 15 16 933 883 922 985

Total operations 208 217 $ 830 $ 771 $ 1,086 $ 969

Cost of sales1 ($/oz) $ 858 $ 795

Cash costs, excluding royalties $ 780 $ 718

Royalties 50 53

Total cash costs2 $ 830 $ 771

All-in sustaining costs2 $ 1,086 $ 969

Gold Production

(000s oz)

Cost of Sales1

($ per ounce)

Total Cash

Costs2

($ per ounce

produced)

All-in Sustaining

Costs2

($ per ounce

sold)

Nine months ended September 30, 2018 2017 2018 2017 2018 2017 2018 2017

Owner-operator

Essakane (90%) 302 287 $ 761 $ 783 $ 716 $ 746 $ 968 $ 946

Rosebel (95%) 202 223 858 751 855 722 1,017 902

Westwood (100%)3 101 96 834 819 823 792 1,003 954

Owner-operator4 605 606 $ 805 $ 777 $ 780 $ 744 $ 1,042 $ 978

Joint Ventures 46 48 933 919 939 987

Total operations 651 654 $ 791 $ 757 $ 1,035 $ 978

Cost of sales1 ($/oz) $ 805 $ 777

Cash costs, excluding royalties $ 736 $ 705

Royalties 55 52

Total cash costs2 $ 791 $ 757

All-in sustaining costs2 $ 1,035 $ 978

1 Cost of sales, excluding depreciation, as disclosed in note 31 of the Company's consolidated interim financial statements is on an attributable ounce sold basis (excluding the

non-controlling interests of 10% at Essakane and 5% at Rosebel) and does not include Joint Ventures which are accounted for on an equity basis.

2 This is a non-GAAP measure. Refer to the non-GAAP performance measures section of the MD&A. Consists of Essakane, Rosebel, Westwood and the Joint Ventures on an

attributable basis.

3 There was no normalization of costs of sales per ounce for Westwood for the three and nine months ended September 30, 2018 (three and nine months ended September 30,

2017 - $nil and $8 per ounce, respectively). Normalization of costs ended at the onset of the second quarter 2017.

4 Owner-operator all-in sustaining costs include corporate general and administrative costs. Refer to all-in sustaining costs reconciliation on page 26 of the MD&A.

OPERATIONS ANALYSIS BY MINE SITE

Essakane Mine - Burkina Faso (IAMGOLD interest - 90%)

Essakane produced 96,000 attributable ounces in the third quarter 2018, 3% higher than the same prior

year period, primarily due to higher head grades. Mine production was higher compared to the same prior

year period due to increased equipment availability. Ore mined was higher compared to the same prior

year period as the mine reached ore zones and lower grade heap leach ore was stockpiled. The mill

continued to perform significantly higher than the nameplate capacity of 10.8 million tonne s per annum,

with an annualized throughput rate of approximately 13.5 million tonnes.

Cost of sales of $809 per ounce sold for the third quarter 2018 was comparable to $810 per ounce in the

same prior year period as the impact of higher capitalized stripping, higher sales volume, and a stronger

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U.S. dollar relative to the euro, was offset by increased maintenance and contractor costs resulting from

higher mine production, and higher energy costs.

Total cash costs of $762 per ounce produced for the third quarter 2018 were 2% lower than the same prior

year period, primarily due to higher capitalized stripping due to mine sequencing, higher production

volume, and a stronger U.S dollar relative to the euro, partially offset by increased maintenance and

contractor costs resulting from higher mine production, and higher energy costs.

All-in sustaining costs of $993 per ounce sold for the third quarter 2018 were 5% higher than the same

prior year period primarily due to higher sustaining capital expenditures.

Total cash costs and all-in sustaining costs for the third quarter 2018 included the impact of realized

derivative gains from hedging programs of $19 per ounce produced and $19 per ounce sold, respectively

(Q3/17 - $10 and $12).

Sustaining capital expenditures for the third quarter 2018 of $18.6 million included capitalized stripping of

$12.0 million, mobile equipment of $1.5 million, resource development of $1.3 million, capital spares of

$1.1 million, and other sustaining capital expenditures of $2.7 million. Non-sustaining capital expenditures

of $11.7 million included tailings facility liners of $9.5 million, Heap Leach Project costs of $1.2 million,

oxygen plant costs of $0.8 million, and other non-sustaining capital expenditures of $0.2 million.

Construction of the oxygen plant is on target for commissioning in the fourth quarter 2018. The oxygen

plant is designed to increase recoveries through improved leach kinetics, and to improve the efficiency of

the circuit by reducing reagent consumption.

Due to encouraging drill results leading to higher proportions of carbon-in-leach ("CIL") ore, the feasibility

study for the Heap Leach Project was refocused on optimizing the performance of the CIL mill. The

construction of the heap leach facility has been deferred to the end of the CIL operations. This is a lower

capital cost strategy as it will permit the use of the CIL crushing circuit for the heap leaching process, and

is expected to provide superior economic returns. Heap leach grade ore will be stockpiled i n the interim.

At the Gossey satellite prospect located approximately 15 kilometres northwest of the Essakane operation,

technical studies progressed well during the quarter to support the declaration of an initial resource

estimate expected for the fourth quarter 2018.

Outlook

We increased Essakane's 2018 production guidance to 390,000 to 405,000 attributable ounces, compared

to the previously disclosed guidance of 380,000 to 395,000 ounces. The increase reflects higher

throughput benefiting from increased mill availability relative to the initial plan for the year. Capital

expenditures are expected to be approximately $135 million, comprising $90 million of sustaining capital

expenditures and $45 million of non-sustaining capital expenditures. The non-sustaining capital

expenditure guidance reflects a decrease of $5 million due to the evaluation of alternative cost effective

methods to expand production with a shift in timing of the Heap Leach Project.

Rosebel Mine - Suriname (IAMGOLD interest - 95%)

Attributable gold production of 67,000 ounces for the third quarter 2018 was 11% lower than the same prior

year period, primarily due to lower throughput and head grades. Mill throughput was lower primarily due to

higher hard rock content, while head grades were lower due to mine sequencing. Mine production was 6%

lower than the same prior year period, primarily due to lower labour productivity during the Collective

Labour Agreement negotiations, which have now been finalized. The finalized agreement includes terms

that are expected to have a favourable impact on mine production, with components of variable

compensation that are benchmarked against productivity targets.

Cost of sales of $921 per ounce sold and total cash costs of $893 per ounce produced for the t hird quarter

2018 were higher than the same prior year period by 20% and 24%, respectively. The increases were

primarily due to lower sales and production volumes, increased preventative maintenance, lower

capitalized stripping due to mine sequencing, higher energy costs, and a lump sum payment with the

finalization of a new Collective Labour Agreement. A two-year Collective Labour Agreement was finalized

on September 14, 2018, which included a lump sum payment of $1.7 million, or $24 per ounce produced

and $26 per ounce sold.

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All-in sustaining costs of $1,113 per ounce sold for the third quarter 2018 were 24% higher than the same prior

year period primarily due to higher cost of sales per ounce and higher sustaining capital expenditures.

Total cash costs and all-in sustaining costs for the third quarter 2018 included the impact of realized

derivative gains from hedging programs of $13 per ounce produced and $15 per ounce sold, respectively

(September 30, 2017 - $1 and $1).

Sustaining capital expenditures for the third quarter 2018 of $11.9 million included capital spares of $3.2

million, mobile equipment of $2.3 million, capitalized stripping of $2.2 million, tailings management of $1.2

million, pit infrastructure of $1.0 million, mill equipment of $0.8 million, and other sustaining capital

expenditures of $1.2 million. Non-sustaining capital expenditures of $3.8 million related to the Saramacca

Project.

Outlook

We reduced Rosebel's 2018 production guidance to 280,000 to 295,000 ounces compared to the

previously disclosed guidance of 295,000 to 310,000 ounces. The decrease reflects lower mining tonnages

and head grades in the third quarter 2018. Capital expenditures are expected to be approximately $80

million, comprising $45 million of sustaining capital expenditures and $35 million of non-sustaining capital

expenditures. The non-sustaining capital expenditures guidance reflects a decrease of $10 million primarily

due to the deferral of spending for the Saramacca Project based on final engineering work, lower s pending

on indirect costs, and the removal of the 2018 cost contingency. The completion date for the Saramacca

Project remains unchanged.

Saramacca

On September 23, 2018, we announced mineral reserves for the Saramacca Project, allowing for

incorporation into the Rosebel life-of-mine plan (see news release dated September 23, 2018).

Saramacca hosted estimated mineral reserves as at September 1, 2018 on a 100% project basis

comprising probable reserves of 26.5 million tonnes grading 1.8 g/t Au for 1.54 million ounces of gold. Also

on a 100% basis, indicated resources (inclusive of reserves) were estimated at 27.9 million tonnes grading

2.0 g/t Au for 1.76 million ounces of gold and inferred resources at 11.8 million tonnes grading 0.7 g/t Au

for 273,000 ounces of gold. A supporting technical report was filed on SEDAR on November 5, 2018.

Of the 1.54 million ounces of reserves from Saramacca, 66.5% is attributable to IAMGOLD. This is based

on 70% of IAMGOLD's 95% ownership of Rosebel, as per our Unincorporated Joint Venture ("UJV")

Agreement with the Government of Suriname, in which the Government of Suriname holds a 30% interest

in Saramacca.

On an attributable basis, Rosebel's reserves increased by 51%, or 1.6 million ounces, with Saramacca

accounting for 64% of the increase, or 1.0 million ounces. The softer rock expected from Saramacca as

well as overall improvements to the life-of-mine plan have allowed for the inclusion of an additional 0.4

million ounces from the Koolhoven deposit on the Rosebel concession. This followed positive results from

jointly led technical studies, which have outlined an economically viable project for Saramacca and justified

fast tracking of the project development with the commencement of mining expected in the second half of

2019.

An Environmental and Social Impact Study (“ESIA”) to support permitting was submitted during the quarter

to Surinamese environmental regulators. Planned public consultations have been completed and approval

is expected in the fourth quarter 2018. Ongoing technical studies continue and are at various levels of

advancement, ranging from pre-feasibility to detailed engineering, and construction has been initiated for

various elements of the Project. Firm orders have been placed for the acquisition of the l ong-haul fleet, and

the haul road between Saramacca and the current Rosebel concession is in the final phases of detailed

engineering. On-going optimization studies including pit slope dewatering, slope design improvements and

metallurgical testing to further optimize recoveries will continue in the fourth quarter 2018.

The additional reserves together with continued focus on cost containment, have extended Rosebel ’s mine

life by 5 years to 2033. Average annual attributable production, once Saramacca is in or close to full

production, is expected to be 295,000 ounces (337,000 ounces on a 100% basis) from 2020 to 2032. Peak

annual production is expected to be 362,000 ounces (415,000 ounces on a 100% basis).