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IAMGOLD'S GROSS PROFIT INCREASES 438% IN FIRST QUARTER Gold Production up 12%, as Westwood Turns a Corner

Production Results

TSX: IMG NYSE: IAG

NEWS RELEASE

IAMGOLD'S GROSS PROFIT INCREASES 438% IN FIRST QUARTER

Gold Production up 12%, as Westwood Turns a Corner

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

Refer to the Management Discussion and Analysis (MD&A) and Unaudited Consolidated

Interim Financial Statements for the three months ended March 31, 2017 for more information.

Toronto, Ontario, May 9, 2017 - IAMGOLD Corporation (“IAMGOLD” or the “Company”) reported its

consolidated financial and operating results for the quarter ended March 31, 2017.

"It was an outstanding quarter," said Steve Letwin, President and CEO of IAMGOLD. “Gold production

increased by 12% as all owner-operator sites recorded increases. Notably, Westwood doubled its

production over the preceding year.  Gross profit rose by 438% to $35 million due to higher sales volume

and a slight increase in realized gold prices. Net operating cash flow also increased, and we strengthened

our balance sheet by reducing our debt and extending the maturity date to 2025.

“We executed on several growth initiatives in the quarter, including the continuing ramp-up of Westwood

production, buoyed by regulatory approval of the reopening of the mining block affected by the fall of

ground two years ago; continuing high grade drilling results at Saramacca; the acquisition of the remaining

interest in the Siribaya project; a power purchase agreement at Essakane for the development of a 15MW

solar power project; and the advancement of the pre-feasibility study for Côté Gold.”

First Quarter 2017 Highlights

Operating Performance

• Attributable gold production of 214,000 oz, up 23,000 ounces from Q1/16.

• Cost of sales1 of $769/oz sold, down 7% from Q1/16.

• All-in sustaining costs2 of $992/oz sold, down 8% from Q1/16.

• Total cash costs2 of $766/oz produced, up 3% from Q1/16.

• Gold margin2 of $464/oz, up $22/oz from Q1/16.

• Maintaining 2017 production and cost guidance.

Financials

• Gross profit of $35.0 million, up $28.5 million from Q1/16.

• Net loss of $18.0 million ($0.04 per share), down from net earnings of $53.1 million ($0.13 per

share) in Q1/16, primarily due to a loss of $20.2 million on the 6.75% senior unsecured notes in the

first quarter 2017 and a gain of $72.9 million on the sale of gold bullion in the same prior year

period.

• Adjusted net earnings from continuing operations2 of $5.1 million ($0.01 per share2), up $12.4

million ($0.03 per share) from Q1/16.

• Net cash from operating activities of $68.3 million, up $16.9 million from Q1/16.

• Net cash from operating activities before changes in working capital2 of $85.8 million, up $34.1

million from Q1/16.

• Cash, cash equivalents and restricted cash of $1,184.7 million as at March 31, 2017 (includes

$505.6 million used to redeem IAMGOLD's $489.1 million of outstanding 6.75% senior unsecured

notes due in 2020 on April 3, 2017).

Developments

• On March 16, 2017, completed a $400 million senior notes offering bearing interest at 7.00% due in

2025. Subsequently, on April 3, 2017, used the net proceeds from the offering and existing cash to

redeem the 6.75% senior unsecured notes for $505.6 million. Concurrently, S&P Global Ratings

2

assigned a rating of "B+" to the Notes while upgrading IAMGOLD's Corporate credit rating to "B+"

from "B".

• On March 21, 2017, received approval from provincial regulators in Quebec to resume mining in the

104 block of the Westwood mine which had been affected by a seismic event in May 2015. As a

result, we expect to operate at normal production levels and will no longer normalize production

costs after the first quarter 2017.

• On March 29, 2017, announced results from ongoing 2017 infill drilling program at Saramacca, with

highlights including: 40.91 g/t Au over 60.5 metres, including 75.91 g/t Au over 19.5 metres; and

5.33 g/t Au over 52.6 metres.

• On March 3, 2017, entered into a power purchase agreement for the development of a 15 MW

solar power plant for the Essakane mine in Burkina Faso. The agreement is for an initial period of

up to 15 years, with construction expected to commence during the second quarter and

commissioning expected by the end of 2017.

• The Côté Gold project pre-feasibility study ("PFS") is progressing on schedule and in line with the

development layout disclosed in the February 2017 Preliminary Economic Assessment. The field

programs and technical sub-studies being undertaken to support the PFS are largely complete and

cost estimating is well underway. We continue to expect the Côté Gold PFS to be completed by late

second quarter 2017.

• Issued 3.4 million flow-through common shares for net proceeds of $15.1 million.

• On February 28, 2017, increased our ownership in Merrex Gold Inc. to 100%, which gives us 100%

ownership of the Siribaya project in Mali.

• On March 2, 2017, participated in INV Metals Inc.'s public equity offering which allowed us to

maintain our 35.6% ownership in INV Metals.

SUMMARY OF FINANCIAL AND OPERATING RESULTS

Three months ended

March 31,

Financial Results ($ millions, except where noted) 2017 2016

Revenues $ 260.5 $ 219.7

Cost of sales $ 225.5 $ 213.2

Gross profit $ 35.0 $ 6.5

Net earnings (loss) attributable to equity holders of IAMGOLD $ (18.0) $ 53.1

Net earnings (loss) attributable to equity holders of IAMGOLD ($/share) $ (0.04) $ 0.13

Adjusted net earnings (loss) attributable to equity holders of IAMGOLD1 $ 5.1 $ (7.3)

Adjusted net earnings (loss) attributable to equity holders ($/share)1 $ 0.01 $ (0.02)

Net cash from operating activities $ 68.3 $ 51.4

Net cash from operating activities before changes in working capital1 $ 85.8 $ 51.7

Key Operating Statistics

Gold sales – attributable (000s oz) 212 191

Gold production – attributable (000s oz) 214 191

Average realized gold price1 ($/oz) $ 1,230 $ 1,188

Cost of sales2 ($/oz) $ 769 $ 827

Total cash costs1 ($/oz) $ 766 $ 746

All-in sustaining costs1 ($/oz) $ 992 $ 1,084

Gold margin1 ($/oz) $ 464 $ 442

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 27 of the Company's consolidated interim financial statements on an attributable ounce sold

basis (excluding the non-controlling interests of 10% at Essakane and 5% at Rosebel) and doesn't include Joint Ventures which are accounted for on

an equity basis.

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FIRST QUARTER 2017 HIGHLIGHTS

Financial Performance

• Revenues for the first quarter 2017 were $260.5 million, up $40.8 million or 19% from the same prior

year period primarily due to higher sales volume at Westwood ($12.1 million), Rosebel ($11.3 million)

and Essakane ($8.2 million), and a higher realized gold price ($9.0 million).

• Cost of sales for the first quarter 2017 were $225.5 million, up $12.3 million from the same prior year

period. The increase was primarily due to higher operating costs ($9.2 million), higher depreciation

($1.9 million) and higher royalty expense ($1.2 million). Operating costs were higher primarily as a

result of lower capitalized stripping due to mine sequencing and higher processing costs due to harder

rock.

• Depreciation expense for the first quarter 2017 was $63.4 million, up 3% from the same prior year

period primarily due to higher amortization of capitalized stripping at Essakane and higher production,

partially offset by higher reserves at Essakane.

• Income tax expense for the first quarter 2017 was $8.7 million, up $2.7 million from the same prior

year period. The income tax expense for the first quarter 2017 comprised current income tax expense

of $11.4 million (March 31, 2016 - $1.2 million) and deferred income tax recovery of $2.7 million

(March 31, 2016 - deferred income tax expense of $4.8 million). The increase in income tax expense

in 2017 was primarily due to differences in the level of taxable income in our operating jurisdictions

from one period to the next and to changes to deferred income tax assets and liabilities as a result of

fluctuations in foreign exchange.

• Net loss attributable to equity holders for the first quarter 2017 was $18.0 million ($0.04 per share),

down from net earnings attributable to equity holders of $53.1 million ($0.13 per share) for the same

prior year period. The decrease of $71.1 million or $0.17 per share was mainly due to the gain on the

sale of gold bullion from 2016 ($72.9 million), a loss on the 6.75% senior unsecured notes ($20.2

million) and higher exploration expenses ($4.9 million), partially offset by higher gross profit ($28.5

million) and lower other expenses ($4.8 million).

• Adjusted net earnings attributable to equity holders2 for the first quarter 2017 were $5.1 million ($0.01

per share2), up from an adjusted net loss of $7.3 million ($0.02 per share) for the same prior year

period.

• Net cash from operating activities for the first quarter 2017 was $68.3 million, up $16.9 million from the

same prior year period. The increase was mainly due to higher earnings after non-cash adjustments

($30.6 million) and lower net settlement of derivatives ($4.9 million), partially offset by a change in the

movement of non-cash working capital ($17.2 million).

• Net cash from operating activities before changes in working capital2 for the first quarter 2017 was

$85.8 million, up $34.1 million from the same prior year period.

Financial Position

• Cash, cash equivalents and restricted cash were $1,184.7 million as at March 31, 2017, including

$505.6 million used to redeem IAMGOLD's 6.75% senior notes on April 3, 2017. The $422.0 million

increase from December 31, 2016 was due to net proceeds from the issuance of Notes ($393.6

million), cash generated from operating activities ($68.3 million), and proceeds from the issuance of

flow-through shares ($15.1 million), partially offset by spending on Property, plant and equipment and

Exploration and evaluation assets ($46.0 million).

Production and Costs

• Attributable gold production, inclusive of joint venture operations, for the first quarter 2017 was

214,000 ounces, up 23,000 ounces from the same prior year period. The increase was due to higher

throughput and grades at both Westwood (15,000 ounces) and Rosebel (6,000 ounces) and higher

throughput at Essakane (5,000 ounces), partially offset by lower grades at Sadiola (3,000 ounces).

• Attributable gold sales, inclusive of joint venture operations, were 212,000 ounces for the first quarter

2017, up 21,000 ounces from the same prior year period, primarily due to higher sales at Westwood

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(10,000 ounces), Rosebel (9,000 ounces) and Essakane (6,000 ounces), partially offset by lower sales

at our Joint Ventures (4,000 ounces).

• Cost of sales1 per ounce sold for the first quarter 2017 of $769 was down 7% from the same prior year

period due to the factors noted in the cost of sales discussion under the Financial Performance section

above.

• Total cash costs2 per ounce produced for the first quarter 2017 of $766 an ounce were up 3% from the

same prior year period primarily as a result of lower capitalized stripping due to mine sequencing and

higher processing costs due to harder rock, partially offset by higher production.

• All-in sustaining costs2 per ounce sold were $992 for the first quarter 2017, 8% lower than the same

prior year period as a result of lower sustaining capital expenditures.

• Cash costs and all-in sustaining costs for Q1 2017 included a reduction of $3 per ounce ($32/oz for Q1

2016) for the normalization of costs and revised ramp-up at Westwood and realized derivative losses

of $nil per ounce sold ($10/oz for Q1 2016).

Commitment to Zero Harm Continues

• The DART rate3, representing the frequency of all types of serious injuries across IAMGOLD for the first

quarter 2017 was 0.40, below our target of 0.56. Unfortunately, we had a fatality of an employee at the

Westwood mine during the first quarter 2017.

ATTRIBUTABLE GOLD PRODUCTION AND COSTS

Gold Production

(000s oz)

Cost of Sales1

($ per ounce sold)

Total Cash Costs3

($ per ounce

produced)

All-in Sustaining

Costs3

($ per ounce sold)

Three months ended

March 31, 2017 2016 2017 2016 2017 2016 2017 2016

Owner-operator

Essakane (90%) 93 88 $ 793 $ 754 $ 766 $ 691 $ 973 $ 1,116

Rosebel (95%) 74 68 737 815 727 768 886 955

Westwood (100%)2 30 15 792 1,236 759 857 965 890

197 171 $ 769 $ 827 750 736 990 1,111

Joint Ventures 17 20 962 833 1,011 852

Total operations 214 191 $ 766 $ 746 $ 992 $ 1,084

Cost of sales1 ($/oz) $ 769 $ 827

Cash costs, excluding

royalties $ 715 $ 694

Royalties 51 52

Total cash costs3 $ 766 $ 746

All-in sustaining costs3 $ 992 $ 1,084

1 Cost of sales, excluding depreciation, as disclosed in note 27 of the Company's consolidated interim financial statements on an attributable ounce sold

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

equity basis.

2 Cost of sales per ounce sold for Westwood does not consider the impact of normalization of costs and revised ramp-up for the three months ended

March 31, 2017 of $25 per ounce (three months ended March 31, 2016 - $343).

3 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.

5

OPERATIONS ANALYSIS BY MINE SITE

(Refer to the Q1 2017 MD&A for further details.)

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

Attributable gold production of 93,000 ounces for the first quarter 2017 was 6% higher than the same

quarter 2016 due to higher throughput, partially offset by lower grades and recoveries. The 27% increase

in mill throughput, despite the proportion of hard rock climbing from 79% to 83%, was the result of reduced

maintenance downtime. Mill throughput has increased for the fifth consecutive quarter. A new SAG mill

liner design has allowed for an increase in grinding capacity and mill speed without risk of damage to the

liners.

Due to mine sequencing, lower grade stockpiles were processed in the first quarter 2017 compared to

higher grade ore from the bottom of the pit in the same prior year period. Additionally, mining activities

were lower compared to the same prior year period as a result of decreased equipment availability.

Several initiatives are underway at Essakane to improve mining efficiency, in addition to the commissioning

of one additional loader and two additional production drills.

Recoveries continue to be affected by the high graphite content in the ore. A geometallurgical study, begun

last year to help better identify where there are pockets of graphitic material in the ore zones, is expected to

be completed in the second quarter this year. Additionally, Essakane is in the preliminary engineering stage

of adding an oxygen plant to the circuit. The oxygen plant is expected to increase recoveries through improved

kinetics and improve the efficiency of the circuit by reducing reagents consumption.

Cost of sales per ounce sold for the first quarter 2017 was $793, compared to $754 in same prior year

period. The 5% increase was primarily the result of lower capitalized stripping due to mine sequencing and

higher processing costs due to harder rock, partially offset by higher sales.

During the quarter, Essakane entered into a power purchase agreement for the development of a 15 MW

solar power plant. The agreement is for an initial period of up to 15 years. Construction is expected to

begin in the second quarter with commissioning by the end of 2017. The solar plant will be integrated with

the existing 57MW HFO plant, and is expected to save approximately six million liters of fuel and reduce

CO2 emissions by 18,500 tonnes annually.

All-in sustaining costs per ounce sold for the first quarter 2017 were $973 compared to $1,116 in the same

prior year period. The 13% decrease was primarily due to lower sustaining capital expenditures. All-in

sustaining costs in the first quarter 2017 included $1 per ounce for realized derivative losses compared to

$10 per ounce in the same quarter 2016.

Rosebel Mine - Suriname (IAMGOLD interest - 95%)

Rosebel produced 74,000 attributable ounces in the first quarter 2017; up 9% from the same prior year

period. The increase was due to higher throughput and grades, partially offset by lower recoveries.

Mill throughput increased by 4% in the first quarter 2017, despite the proportion of hard rock increasing

from 35% to 47%. The processing of hard rock improved as a result of major mill improvements in 2016,

including the installation of a secondary crusher and power flex drive combined with the new liner design.

Based on the success of the secondary crusher, Rosebel is studying further modifications to the crushing

and grinding circuit to improve hard rock processing capacity. Higher grades were due to mine sequencing

and the draw down of higher grade stockpiles compared to the same prior year period, while lower

recoveries were partly due to circuit maintenance, which resulted in slightly coarser grinds and reduced

residence time. Mining activities were lower compared to the same prior year period due to increased

hauling distances as a greater proportion of ore was sourced further away from the mill, harder rock, and

an increased level of rainfall.

Due to design optimization as well as drilling and blasting initiatives, Rosebel was able to significantly

reduce the consumption of explosives compared to the prior year period without compromising results,

resulting in both cost savings and a reduction in the dilution factor.

Cost of sales per ounce sold for the first quarter 2017 was $737 compared to $815 in the same prior year

period. The 10% decrease was primarily due to higher sales, partially offset by higher realized fuel prices.

All-in sustaining costs per ounce sold for the first quarter 2017 were $886 compared to $955 in the same

prior year period. The 7% decrease was primarily due to lower sustaining capital expenditures and lower

cost of sales. The impact per ounce from realized derivative losses in the first quarter 2017 was $nil

compared to $9 in Q1 2016.

6

Based on the encouraging results from the 2016 drilling program on the Saramacca property, we

commenced a follow-up infill diamond drilling program in the first quarter to further define and confirm

continuity of the key mineralized structures. The first assay results from this program continue to confirm

wide intervals of high grade mineralization. Highlights include: 40.91 g/t Au over 60.5 metres, including

75.91 g/t Au over 19.5 metres, and 5.33 g/t Au over 52.6 metres (see news release dated March 29, 2017).

To date, the mineralized zone remains open along strike and at depth. Further assay results will be

reported as they are received, validated and compiled. The drilling results will be incorporated into a

deposit model to support an initial National Instrument 43-101 resource estimate expected to be completed

by the third quarter 2017.

To further maximize reserves, Rosebel continues to focus on near-pit exploration, with priority given to zones

in the northern trend due to their proximity to the mill.

Westwood Mine - Canada (IAMGOLD interest - 100%)

In March 2017, all required documentation to support the reopening of the 104 block that had been

affected by the seismic event in 2015, including the geomechanical risk management plan, was submitted

to the governing body. On March 21, 2017, Westwood received approval from provincial regulators in

Quebec to resume mining activities in the area.

Gold production of 30,000 ounces in the first quarter 2017 was double that of the same period last year.

This was primarily due to the continued ramp-up resulting in higher throughput and higher grades from

mining the 132 level.

Underground development to open up access to new mining areas continued in the first quarter 2017.

Approximately 5,100 and 700 metres of lateral and vertical development, respectively, was completed,

averaging 65 metres per day. Westwood plans to complete 20 kilometres of underground development in

2017, with a focus on ramp breakthroughs and infrastructure development in future development blocks at

lower levels.

Cost of sales was $792 per ounce sold, 36% lower than the same period last year mainly due to higher

sales.

Total cash costs per ounce produced for the first quarter 2017 were $759 compared to $857 in the same

prior year period.

All-in sustaining costs per ounce sold were $965 for the first quarter 2017 compared to $890 in the same

prior year period. The 8% increase in all-in sustaining costs was primarily due to higher sustaining capital

and lower normalization, partially offset by higher sales volume and lower cost of sales.

In accordance with International Financial Reporting Standards, costs attributed to inventory for the first

quarter 2017 were reduced by $0.7 million, compared with $6.1 million in the same prior year period, to

normalize for the amount of fixed overhead on a per unit basis as a consequence of abnormally low

production. As a result, total cash costs and all-in sustaining costs for the first quarter 2017 were reduced

by $23 per ounce produced and $25 per ounce sold, compared with $418 per ounce produced and $343

per ounce sold in the same prior year period.

The Company does not expect to continue normalizing total cash costs and all-in sustaining costs as the

operations reached normal production levels at the beginning of the second quarter 2017.

Sadiola Mine - Mali (IAMGOLD interest - 41%)

Attributable gold production for the first quarter 2017 of 16,000 ounces was 16% lower than the same prior

year period as a result of lower grades, partially offset by increased throughput. All-in sustaining costs per

ounce sold for the first quarter 2017 were $1,016 compared with $821 in the same prior year period,

reflecting the decrease in sales with the lower production.

We expect Sadiola to continue mining oxides into early 2018 and processing oxides into early 2019. We

intend to move ahead with the Sadiola Sulphide project, with construction commencing upon the

Government of Mali’s renewal of construction and operating permits, the power agreement and fiscal terms

related to the project. An optimization study is being completed to refine project economics.

7

EXPLORATION

(Refer to the Q1 2017 MD&A for further details.)

In the first quarter 2017, we spent $14.2 million on exploration and project studies, of which $10.9 million

was expensed and $3.3 million capitalized. This compared to $9.9 million in the same prior year period.

The following summarizes the status of our most advanced projects:

Wholly-Owned Projects

Boto - Senegal

During the first quarter 2017, approximately 7,700 metres of diamond drilling were completed to follow up

encouraging results from the 2016 drilling program at the Malikoundi deposit as well as to further explore

for additional mineral resources along known mineralized trends associated with the Boto 5 and 6 zones.

The results of this drilling will be incorporated into a revised geological model to support an updated

resource estimate in 2017. Technical and environmental studies are ongoing to advance the economic

evaluation of the project.

Pitangui - Brazil

In late 2016, we received the necessary permits to complete drilling of the interpreted up-plunge extension

of the São Sebastião deposit within a densely vegetated area. As such, the focus of the 2017 exploration

drilling program will be to evaluate the up-plunge extension area for additional resources. Just over 2,300

metres of diamond drilling were completed in the first quarter and the results will be used to update the

mineral resources in 2017. Technical and environmental studies continue to be underway to advance the

economic evaluation of the project.

Siribaya - Mali

On February 28, 2017, IAMGOLD acquired, in an all share transaction, all of the issued and outstanding

common shares and all of the outstanding common share purchase warrants and options that it did not

already own of Merrex. Merrex is a Canadian junior exploration company that owns a 50% interest in the

Siribaya project in Mali. Including its 50% previous ownership, IAMGOLD now has a 100% interest in the

Siribaya project. IAMGOLD issued an aggregate of 6.9 million common shares, amounting to 1.5% of its

issued and outstanding shares immediately prior to completion of the transaction. The total purchase price

amounted to $27.5 million, which included transaction costs of $0.2 million and is net of cash and cash

equivalents acquired of $0.1 million.

During the first quarter, approximately 6,300 metres of diamond and reverse circulation drilling were

completed. The drilling program is designed to follow up the encouraging results from the 2016 drilling

program with the objectives to increase confidence in the known mineralized zones at the Diakha deposit

and to extend mineralization north and southward along strike. The results will be used to update the

mineral resources in 2017.

Joint Venture Projects

Following are the highlights for our joint venture exploration projects. The agreements are typically

structured in a way that gives us the option of increasing our ownership interest over time, with the

decision dependent upon the exploration results as time progresses.

Monster Lake - Canada (Option Agreement with TomaGold Corporation)

During the first quarter 2017, just over 8,600 metres of diamond drilling were completed to better define

and extend the 325-Megane zone, and also to drill test a possible second zone discovered in 2016 located

north of the 325-Megane zone. Assay results will be reported once they are received, validated and

compiled. The drill results will be used to guide future drilling and will be incorporated into a deposit model

to support the completion of an initial mineral resource estimate in 2017, if results merit.

8

Nelligan - Canada (Option Agreement with Vanstar Mining Resources Inc.)

During the first quarter 2017, assay results were reported from drilling completed in the fourth quarter

2016, comprised of five diamond drill holes totaling 2,225 metres. The program targeted a newly

discovered mineralized zone located north of the previously known Liam zone. Highlights include: 15.6

metres grading 2.17 g/t Au, 12.7 metres grading 1.76 g/t Au, 6.4 metres grading 12.34 g/t Au and 20.3

metres grading 1.69 g/t Au (see Vanstar news release dated March 14, 2017).

Approximately 6,900 metres of diamond drilling were also completed during the quarter to follow up on the

encouraging results from the 2016 program and further explore the new discovery and other IP

geophysical anomalies on the property. The results of this ongoing drilling program are pending, and once

received and validated, will be used to guide further drill targeting.

Eastern Borosi - Nicaragua (Option Agreement with Calibre Mining Corporation)

During the quarter, just over 3,100 metres of a planned 7,000 metre diamond drilling program were

completed. The program’s objective is to evaluate the resource potential of the Guapinol, Riscos de Oro

and East Dome veins. If the results are positive, they will be used to complete a National Instrument

43-101 resource estimate. In 2017, IAMGOLD expects to vest an initial 51% interest in the project, upon

which it may elect to enter the second option to earn up to a 70% interest in the project by completing

additional exploration expenditures totaling $4.5 million and making $0.5 million in payments to Calibre by

May 26, 2020.

Other

Loma Larga (formerly Quimsacocha) - Ecuador

IAMGOLD, through its 35.6% equity ownership of INV Metals, has an indirect interest in the Loma Larga

gold, silver and copper project in southern Ecuador. INV Metals has completed a preliminary feasibility

study supporting the proposed development of an underground mine with an anticipated production rate of

3,000 tonnes per day, average annual gold production of 150,000 ounces, and a mine life of approximately

12 years (see INV Metal's news release dated July 14, 2016). On March 2, 2017, IAMGOLD participated in

INV Metals' public equity offering and acquired an additional 9.8 million common shares, thereby

maintaining IAMGOLD's 35.6% ownership in INV Metals.

End Notes (excluding tables)

1 Cost of sales, excluding depreciation, as disclosed in note 27 of the Company's consolidated interim financial statements on an attributable ounce

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

on an equity basis.

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

3 The DART refers to the number of days away, restricted duty or job transfer incidents that occur per 100 employees.