Iamgold Reports New GOLD Discovery at the Côté GOLD Project, Ontario
NEWS RELEASE
TSX: IMG NYSE: IAG
IAMGOLD REPORTS NEW GOLD DISCOVERY AT THE CÔTÉ GOLD PROJECT, ONTARIO
Toronto, Ontario, March 26, 2019 – IAMGOLD Corporation (“IAMGOLD” or the “Company”) today
announced results from the ongoing exploration drilling program on the Côté Gold Joint Venture Project,
located 125 km southwest of Timmins and 175 km north of Sudbury, Ontario, Canada. The Côté Gold
Project is a 70:30 joint venture between IAMGOLD Corporation and Sumitomo Metal Mining Co. Ltd (SMM
Gold Côté Inc.).
The Company is reporting assay results from fourteen diamond drill holes (including the deepening of a
historical drill hole) totaling 7,452 metres completed as part of its 2017 – 2018 exploration drilling program,
which has led to the discovery of intrusive-hosted mineralization referred to as the Gosselin Zone. In
addition, the Company is reporting assay results from a drill core re-logging and sampling program of
historical drill holes located along a potential south-west extension of this discovery, referred to as the
Young-Shannon Zone. The assay results are provided in Tables 1 and 2 below and include the following
highlights (a drill hole plan map is attached to this news release):
Gosselin Zone:
Drill hole CL15-39EXT: 350.0 metres grading 0.81 g/t Au
includes: 15.0 metres grading 2.32 g/t Au
includes: 91.0 metres grading 1.13 g/t Au
includes: 104.0 metres grading 1.12 g/t Au
Drill hole GOS17-05: 345.0 metres grading 0.68 g/t Au
includes: 132.3 metres grading 1.13 g/t Au
Drill hole GOS18-07: 130.0 metres grading 0.63 g/t Au
and 139.7 metres grading 1.36 g/t Au
includes: 79.0 metres grading 2.11 g/t Au
Drill hole GOS18-09: 261.2 metres grading 0.65 g/t Au
includes: 163.0 metres grading 0.95 g/t Au
and 92.0 metres grading 1.42 g/t Au
Young-Shannon Zone:
Drill hole YS87-8: 32.5 metres grading 7.53 g/t Au
Drill hole YS90-181: 128.5 metres grading 1.12 g/t Au
The drilling results confirm the discovery of a new zone of mineralization referred to as the “Gosselin
Zone”, located approximately 1.5 km northeast of the Côté Gold Deposit. The Côté Deposit (on a 100%
basis) hosts estimated Proven and Probable Mineral Reserves totaling 7.3 million ounces of contained
gold and Measured and Indicated Mineral Resources (inclusive of Reserves) totaling 10.0 million ounces
of contained gold, and Inferred Mineral Resources totaling 2.4 million ounces of contained gold (see news
releases dated November 1, 2018 and February 19, 2019). The Gosselin discovery represents the most
significant drill intercepts of continuous gold mineralization so far encountered outside of the Côté Deposit
on the joint venture project mineral holdings.
Craig MacDougall, Senior Vice President, Exploration for IAMGOLD, stated: “ The Gosselin Zone is a new
grass-roots discovery, the result of our ongoing commitment to sustained exploration and an excellent
group effort by the Côté Exploration team. With the completion of a positive feasibility study for the Côté
Gold deposit in 2018, demonstrating a solid development opportunity with a long mine life and low
production costs, this exploration success continues to add to our track record of resource expansion and
further enhances the long term value of this exciting development project.”
page 2 of 7
2017 – 2018 Exploration Program
The 2017 – 2018 exploration drilling program was designed to test the continuity of the new Gosselin zone
in a number of directions from the discovery hole (GOS17-05) and to determine if the gold mineralization
intersected at depth extendsi to surface. The program included one drill hole executed as a deepening of a
pre-existing shallow drill hole from 2015 (CL15-39 EXT). All drill holes from the 2017 – 2018 campaign
were collared from land on the north shore of Three Ducks Lake.
The drilling program has confirmed the presence of a wide corridor of gold mineralization with approximate
dimensions of 750 metres (strike), 200 metres (width) and 400 metres (depth). Thirteen of the fourteen
completed drill holes intersected significant core intervals with elevated gold values (see Table 1 below).
Host lithologies are similar to those which host the Côté Gold Deposit and include: tonalite, diorite, diorite
breccia and hydrothermal breccia, all of which are cross-cut by post-mineralization mafic dikes. The
intrusive rocks display alteration assemblages dominated by moderate to intense sericite and silica-albite
alteration, again similar to that observed at the Côté Deposit.
Sulphide mineralization (pyrite, chalcopyrite, and pyrrhotite) occurs throughout the altered rocks as
disseminations, patches, fracture-fillings, veinlets and within the matrix of the hydrothermal breccia. The
sulphide assemblage is locally accompanied by molybdenite and rare visible gold. Sulphides are generally
more-concentrated in the matrix of the hydrothermal breccia, where chalcopyrite has been observed in
abundances from 2 to 3%.
After the initial discovery of the Gosselin Zone, a re-logging and core sampling program of historical drill
holes which originally targeted the near-by Young-Shannon high grade vein system to the southwest of the
Gosselin Zone was initiated to seek a possible connection to the intrusion hosted mineralization
intersected at Gosselin. Historical exploration work carried out on the Young-Shannon property since the
late 1920’s and intermittently until the early 2000’s, included extensive diamond drilling (225 drill holes and
> 33,300 metres of drilling) and underground exploration comprising a shallow inclined shaft with levels at
30 and 57 metres depth, along with a limited amount (200 metres) of lateral development. The historical
work outlined gold values over narrow widths in structurally-controlled quartz-veins within the more mafic
phases of granodiorite, and it was concluded by previous owners to be an Archean lode -gold style of
mineralization hosted in discontinuous veins.
Recovery and re-examination of core from 33 historical drill holes, totaling 5,453 metres, revealed the
presence of wide intervals of unsampled core displaying strong sericite and silica-albite alteration in
tonalite and hydrothermal breccia, associated with disseminated sulphide mineralization. The alteration
and mineralization was interpreted as favorable for intrusion-hosted gold mineralization similar to Gosselin
and the Côté Deposit.
Assay results returned wide intervals of gold mineralization throughout the host rocks, often extending from
top to bottom of the shorter drill holes, including drill holes collared proximal to the Gosselin discovery. Of
the 33 drill holes re-sampled, a total of 15 returned gold mineralization over core intervals greater than 15
metres in length. The assay results are presented in Table 2 below and assay highlights are provided on
the attached map.
Next Steps
The 2019 Phase I exploration diamond drilling program has commenced and entails the completion of 15
planned diamond drill holes (4,500 metres) mainly on Three Ducks Lake. The program is designed to test
for the extension of the new Gosselin zone to surface beneath Three Ducks Lake, and to delineate the
ultimate size potential of this discovery. The program will also test for continuity between the new Gosselin
Zone and the recently discovered intrusion-hosted gold mineralization associated with the Young-Shannon
Zone.
As results merit, a second phase of drilling is anticipated to complete an infill drilling program (50 to 75
metres drill hole spacing) to support the completion of an initial NI 43-101 compliant resource estimate in
2020.
Technical Information and Quality Control Notes
The drilling results contained in this news release have been prepared in accordance with National
Instrument 43-101 Standards of Disclosure for Mineral Projects.
page 3 of 7
The "Qualified Person" responsible for the supervision of the preparation, verification and review of the
technical information in this release is Al Smith, P. Geo, District Manager – Exploration for IAMGOLD in
the Ontario Côte District. He is considered a "Qualified Person" for the purposes of Nat ional Instrument 43-
101 with respect to the technical information being reported on. The "Qualified Person" responsible for
the planning, supervision and execution of the diamond drilling program is Brad McKinley, P. Geo, Senior
Geologist for IAMGOLD in the Ontario Côte District. The technical information has been included herein
with the consent and prior review of the above noted Qualified Persons.
The information in this news release was reviewed and approved by Craig MacDougall, P.Geo., Senior
Vice President, Exploration for IAMGOLD. Mr. MacDougall is a Qualified Person as defined by National
Instrument 43-101.
The sampling of, and assay data from, the drill core is monitored through the implementation of a quality
assurance - quality control (QA-QC) program designed to follow industry best practice. Drill core (NQ size)
samples are selected by the IAMGOLD geologists and sawn in half with a diamond saw at the project site.
Half of the core is retained at the site for reference purposes. Sample intervals may vary from half a metre
to one and a half metres in length depending on the geological observations. Samples were stored in
sealed plastic bags and packed into fiber backs onto a pallet where they were shrink wrapped for
transport. A formal chain-of-custody procedure was adopted for security of samples until their delivery at
the laboratory.
Activation Laboratories Limited (located in Timmins, Ontario) and AGAT Laboratories (Thunder Bay and
Mississauga, Ontario) were the both utilized for assay analyses. Actlabs completed crushing, pulverizing,
and fire assay in Timmins Ontario. AGAT Laboratories completed crushing and pulverizing in their
Thunder Bay facility and shipped the pulps to their Mississauga facility for fire assay.
Analyses completed at both facilities were similar and are summarized below. Activation Laboratories
completed the following: Samples are coarse crushed to 90% passing 2.0 mm screen (10 mesh screen),
riffle split (250 gram) and (mild steel) to 95% passing 105µm. Cleaner sand is included. Samples were
analyzed using a standard 30 gram fire assay (30 g aliquot) with an Atomic Absorption (AA) finish. For
samples that returned assay values over 3.0 grams per tonne (g/t), another cut is taken from the original
pulp and fire assayed with a gravimetric finish. For samples showing visible gold (VG) or samples which
have returned values greater than 5.0 g/t, these were re-analyzed by pulp metallic analysis. IAMGOLD
inserts blanks and certified reference standards in the sample sequence for quality control.
AGAT Labs used a very similar procedure comprising the following: Samples are coarse crushed to 75%
passing 2.0 mm screen (10 mesh screen), riffle split (250 gram) and (mild steel) to 85% passing 75µm.
Cleaner sand included. Samples were analyzed using a standard 30 gram fire assay (30 g aliquot) with an
Atomic Absorption (AA) finish. For samples that return assay values over 3.0 grams per tonne (g/t),
another cut is taken from the original pulp and fire assayed with a gravimetric finish. For samples showing
visible gold (VG) or samples which have returned values greater than 5.0 g/t, these were re-analyzed by
pulp metallic analysis. IAMGOLD inserts blanks and certified reference standards in the sample sequence
for quality control.
Forward Looking Statement
This news release contains forward-looking statements. All statements, other than of historical fact, that address
activities, events or developments that the Company believes, expects or anticipates will or may occur in the future
(including, without limitation, statements regarding expected, estimated or planned gold production, cash costs, margin
expansion, capital expenditures and exploration expenditures and statements regarding the estimation of mineral
resources, exploration results, potential mineralization, potential mineral resources and mineral reserves) are forward-
looking statements. Forward-looking statements are generally identifiable by use of the words “will”, “should”,
“continue”, “expect”, “anticipate”, “estimate”, “believe”, “intend”, “to earn”, “to have’, “plan” or “project” or the negative of
these words or other variations on these words or comparable terminology. Forward-looking statements are subject to
a number of risks and uncertainties, many of which are beyond the Company’s ability to control or predict, that may
cause the actual results of the Company to differ materially from those discussed in the forward-looking
statements. Factors that could cause actual results or events to differ materially from current expectations include,
among other things, without limitation, failure to meet expected, estimated or planned gold production, cash costs,
margin expansion, capital expenditures and exploration expenditures and failure to establish estimated mineral
resources, the possibility that future exploration results will not be consistent with the Company's expectations,
changes in world gold markets and other risks disclosed in IAMGOLD’s most recent Form 40-F/Annual Information
Form on file with the United States Securities and Exchange Commission and Canadian provincial securities
regulatory authorities. Any forward-looking statement speaks only as of the date on which it is made and, except as
page 4 of 7
may be required by applicable securities laws, the Company disclaims any intent or obligation to update any forward-
looking statement.
About IAMGOLD
IAMGOLD ( www.iamgold.com) is a mid -tier mining company with four operating gold mines on three
continents. A solid base of strategic assets in North and South America and West Africa is complemented
by development and exploration projects and continued assessment of accretive acq uisition opportunities.
IAMGOLD is in a strong financial position with extensive management and operational expertise.
For further information please contact:
Indi Gopinathan, Investor Relation Lead, IAMGOLD Corporation
Tel: (416) 360-4743 Mobile: (416) 388-6883
Martin Dumont, Senior Analyst 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 web site
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
http://www.iamgold.com/French/accueil/default.aspx.
page 5 of 7
Notes:
1. Insufficient drilling has been completed to accurately determine the Gosselin Zone orientation. Estimated true widths are
approximately 60 to 95% of the Core Interval.
2. Drill hole intercepts are calculated with alower cut-off grade of 0.30 g/t Au
3. Assay intervals are reported uncut, but higher grade sub intervals are shown.
Hole No. AZ DIP EOH From To Core
Interval (1) Au (2)
Easting Northing Elevation (°) (°) (m) (m) (m) (m) (g/t)
CL15-39EXT 430999 5268192 386 160 -45 648.0 298.0 648.0 350.0 0.81
Including (3) 298.0 313.0 15.0 2.32
Including (3) 301.1 302.0 0.9 22.0
Including (3) 399.0 490.0 91.0 1.1
Including (3) 438.7 440.0 1.3 12.8
Including (3) 462.3 462.8 0.6 15.2
Including (3) 544.0 648.0 104.0 1.1
GOS17-03 431772 5268022 383 200 -50 500.0 390.2 401.0 10.8 1.27
GOS17-04 431627 5268073 382 200 -48 900.0 292.5 389.5 97.0 0.41
GOS17-05 431533 5268149 382 209 -53 722.0 377.0 722.0 345.0 0.68
Including (3) 647.5 648.0 0.5 11.23
Including (3) 452.5 584.8 132.3 1.13
GOS18-06 431393 5268102 390 225 -60 634.0 399.5 487.4 87.9 0.72
GOS18-07 431348 5268065 383 221 -43 607.0 272.5 402.5 130.0 0.63
467.3 607.0 139.7 1.36
Including (3) 550.5 551.9 1.4 52.87
Including (3) 487.0 566.0 79.0 2.11
GOS18-08 431023 5268183 387 95 -48 300.0
GOS18-09 430924 5267874 383 141 -55 450.0 8.0 139.0 131.0 0.32
157.8 419.0 261.2 0.65
Including (3) 256.0 419.0 163.0 0.95
Including (3) 305.0 397.0 92.0 1.42
GOS18-10 430844 5267811 382 172 -60 525.0 18.4 36.0 17.6 0.48
98.0 137.0 39.0 0.32
269.5 525.0 255.5 0.73
Including (3) 393.3 525.0 131.7 1.13
Including (3) 509.0 510.3 1.3 59.90
GOS18-11 430595 5267834 382 189 -49 492.0 315.0 444.4 129.4 0.81
Including (3) 360.0 444.4 84.4 1.16
Including (3) 364.0 365.0 1.0 10.40
Including (3) 392.5 393.3 0.8 47.00
GOS18-12 430244 5267643 387 144 -50 408.0 122.2 138.0 15.8 0.48
GOS18-13 430491 5267418 386 31 -54 312.0 7.0 32.6 25.6 0.44
257.2 311.0 53.9 0.35
GOS18-14 430873 5267516 381 309 -49 453.0 107.0 343.5 236.5 0.83
Including (3) 207.5 208.2 0.8 15.70
Including (3) 251.0 252.0 1.0 21.90
Including (3) 333.8 334.7 0.9 32.50
GOS18-15A 431322 5268017 386 184 -49 501.0 214.0 274.5 60.5 0.75
320.6 342.3 21.7 1.87
349.0 401.0 52.0 0.31
414.0 499.0 85.0 0.36
TOTAL 7452.0
Table 1 Gosselin Project Drilling Results - 2017-2018 Drilling program
UTM NAD83 Zone17
no significant values
page 6 of 7
Notes:
1. True widths are not established yet. Geological modelling of the Au-bearing Young-Shannon breccia + tonalite is required
before true widths can properly be established.
2. Significant Au composites from 2018 Re-log exceeding 15m of core length. Assays are reported un-cut only.
Hole No. AZ DIP EOH From To Core
Interval (1) Au (2)
Easting Northing Elevation (°) (°) (m) (m) (m) (m) (g/t)
YS87-8 430460 5267280 388 330 -45 183.2 43.0 74.5 31.5 0.40
117.5 150.0 32.5 7.53
Including 124.0 126.0 2.0 79.1
Including 130.0 132.0 2.0 15.4
YS88-47c 430477 5267250 390 325 -65 284.8 1.9 30.0 28.1 0.43
YS89-82B 430953 5267600 382 335 -65 169.5 25.0 41.0 16.1 0.40
81.8 110.5 28.7 0.79
YS89-89 430596 5267360 399 330 -45 138.6 24.0 59.2 35.2 2.12
59.2 91.4 32.2 0.34
Including 35.0 37.0 2.0 23.4
YS89-108B 430893 5267550 382 330 -60 170.5 5.0 20.2 15.2 1.47
Including 5.0 5.8 0.8 14.5
35.0 71.8 36.7 0.41
YS89-110 430910 5267530 383 330 -60 195.0 21.6 44.3 22.7 0.77
47.4 134.6 87.2 0.87
Including 63.0 64.5 1.5 12.6
141.0 162.4 21.4 1.12
YS89-116 430930 5267490 382 330 -60 272.3 146.2 180.7 34.5 0.32
187.5 226.0 38.5 1.31
Including 207.5 209.0 1.5 11.3
YS89-163 430646 5267280 400 330 -45 205.8 118.4 140.3 21.9 2.65
Including 130.0 132.0 2.0 11.6
YS90-172B 430973 5267620 382 330 -65 155.5 132.3 150.8 18.5 0.55
YS90-179 431060 5267710 382 330 -45 109.7 46.9 72.9 26.0 0.39
YS90-180 431083 5267680 382 330 -45 143.3 109.7 143.3 33.6 0.32
YS90-181 431015 5267610 382 330 -65 198.5 66.0 194.5 128.5 1.12
Including 125.0 125.5 0.5 40.2
YS90-182B 431189 5267790 382 330 -65 121.9 12.8 118.6 105.8 0.86
YS90-183 431215 5267800 382 330 -45 99.1 12.6 34.7 22.1 0.36
40.3 65.0 24.7 0.43
NV02-03 431340 5267590 382 330 -45 198.1 147.8 163.1 15.2 0.44
173.7 198.1 24.4 0.77
Table 2 Young-Shannon Drill Core Re-sampling Assay Results - 2018
UTM NAD83 Zone17
page 7 of 7
Figure 1: Gosselin – Young Shannon drill hole plan map and highlighted 2017-18 assay results.
GOS18-11
129.4 m grading 0.81 g/t Au
Incl. 84.4 m grading 1.16 g/t Au
GOS18-10
255.5 m grading 0.73 g/t Au
Incl. 131.7 m grading 1.13 g/t Au
GOS18-07
129.9 m grading 0.63 g/t Au
139.7 m grading 1.36 g/t Au
Incl. 79.0 m grading 2.11 g/t Au
GOS18-15A
60.5 m grading 0.75 g/t Au
21.7 m grading 1.87 g/t Au
CL15-39EXT
350.0 m grading 0.81 g/t Au
Incl. 15.0 m grading 2.32 g/t Au
Incl. 91.0 m grading 1.13 g/t Au
Incl. 104.0 m grading 1.12 g/t Au
GOS18-06
87.9 m grading 0.72 g/t Au
GOS17-05
345.0 m grading 0.68 g/t Au
Incl. 132.3 m grading 1.13 g/t Au
GOS18-09
261.2 m grading 0.65 g/t Au
Incl. 163.0 m grading 0.95 g/t Au
Incl. 92.0 m grading 1.42 g/t Au
GOS18-08CL15-39EXT
GOS18-09
GOS18-10
GOS18-11
GOS18-13
GOS18-12
GOS17-04
GOS17-05
GOS18-06
GOS18-07
GOS18-15A
GOS16-02
GOS16-01
GOS17-03
GOS18-14
LEGEND
2018 IAMGOLD drill holes
2017 IAMGOLD drill holes
2016 IAMGOLD drill holes
Historical re-log/re-sampled holes
Historical drill holes
Lake
Modelled hydrothermal breccia
GOSSELIN PROJECT
2017-18 Drilling Program
YS87-8
YS88-47c
YS89-89
YS89-163
NV-02-03
YS90-183YS90-182B
YS90-180
YS90-179
YS90-181
YS90-172B
YS89-82B
YS89-108B YS89-110
YS89-116
YS87-8
31.5 m grading 0.4 g/t Au
32.5 m grading 7.53 g/t Au
YS89-89
35.2 m grading 2.12 g/t Au
32.2 m grading 0.34 g/t Au
YS89-108B
15.2 m grading 1.47 g/t Au
36.7 m grading 0.41 g/t Au
YS89-110
22.7 m grading 0.77 g/t Au
87.2 m grading 0.87 g/t Au
21.4 m grading 1.12 g/t Au
YS89-116
38.5 m grading 1.31 g/t Au
GOS18-14
236.5 m grading 0.83 g/t Au
YS90-181
128.5 m grading 1.12 g/t Au
YS90-182B
105.8 m grading 0.86 g/t Au
Young-Shannon Shaft
GOS17-03
10.8 m grading 1.27 g/t Au
GOS17-04
97.0 m grading 0.41 g/t Au