EX-99.2

EX-99.2 3 d654919dex992.htm EX-99.2 EX-99.2

Exhibit 99.2

LOGO

NI 43-101 Technical report,

Updated mineral resource estimate

for rare earth elements,

2012

NIOBEC MINE PROPERTY

Report prepared by

Louis Grenier, Geo.

Exploration geologist, Niobec Inc.

and

Jean-François Tremblay, Geo.

Supervisor geologist, Niobec Inc.

Report reviewed and approved by

Réjean Sirois, P. Eng.

Vice President, Geology and Resources

G. Mining Services Inc.

March 18^th, 2013

As amended on September 19^th, 2013


		NI-43-101 Technical Report

Date and signature page

This report entitled “Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013 was prepared and signed by the following authors:


Signed & Sealed
Louis Grenier, geo. (OGQ, #800)				September 19, 2013
Exploration Geologist				St-Honoré, Québec
Niobec inc. (IAMGOLD)

Signed & Sealed
Jean-Francois Tremblay, geo. (OGQ, #958)				September 19, 2013
Senior Geologist				St-Honoré, Québec
Niobec inc. (IAMGOLD)

Signed & Sealed
Réjean Sirois, Ing. (OIQ,#38754)				September 19, 2013
Vice President Geology and Resources				Brossard, Québec
G. Mining Services Inc


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		II
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

CERTIFICATE OF LOUIS GRENIER

As an author of this report, Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013 , I Louis Grenier, do hereby certify that:

I reside at 88 4E Chemin Lac Brochet, Saint-David-de-Falardeau, province of Québec, Canada, G0V 1C0;

I am registered professional geologist, member in good standing of Ordre des Géologues du Québec, (OGQ #800);

I graduated from the Université Laval, Quebec city, in 2003 and have a Bachelor’s degree in Geology;

I have practiced my profession as geologist in, mineral exploration and mineral production over the last 10 years;

I have been working for Virginia Mines from 2004 and 2012 as an exploration and project geologist;

As a surface exploration geologist since March 2012, I am a full–time employee of IAMGOLD Corporation/Niobec Inc., Quebec, Canada and I own shares of IAMGOLD Corporation;

I have been in charge since 2012 of the drilling campaigns and involved in resources calculation of the Iamgold Rare Earth Exploration Project;

As a full-time employee at Niobec mining site, 3 400 chemin du Columbium, St-Honoré de Chicoutimi, Québec, G1V 1L0, and responsible of the Rare Earth Exploration Project, I daily visit the Niobec Inc. property and operation since march 2012;

I am responsible for the Item 1 to 12 and 15 to 28 of the Technical Report titled: “Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013”;

10.

I have read the definition of “qualified person” set out in National Instrument 43-101 and certify that by reason of my education, registration as a professional geologist and past relevant work experience, I fulfill the requirements to be a “qualified person” for purposes of NI 43-101 -Per NI 43-101 s.8.1(2)(c);

11.

I am not independent of IAMGOLD Corporation as set out in Section 1.5 of National Instrument 43-101 -as per NI 43-101 s.8.1(2)(f);

12.

I read the NI 43-101 and the technical report Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013, and certified that the technical report has been prepared in compliance with NI 43-101” - as per NI 43-101 s.8.1(2)(h)];

13.

At the date of this certificate, to the best of my knowledge, the report entitled: “Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013” contains all scientific and technical information that is required to be disclosed to make the technical report not misleading -as per NI 43-101 s.8.1(2)(i).

14.

I am not aware of any new information on events occurring subsequent to March 18^th, 2013 that could have a material effect on the resource estimate presented in this Document;

Prepared in St-Honoré-de-Chicoutimi the 18^th of March 2013, amended and signed this 19^th day of September 2013,

Signed & Sealed

Louis Grenier, geo. (OGQ, #800)

Exploration Geologist

Niobec inc. (IAMGOLD)


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		III
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

CERTIFICATE OF JEAN-FRANÇOIS TREMBLAY

I reside at 2972, St-Etienne, in city of Jonquière, province of Québec, Canada, G7S 1H6;

I am registered professional geologist, member in good standing of Ordre des Géologues du Québec, (OGQ #958);

I graduated from the Université du Québec à Chicoutimi in 1999 and have a Bachelor’s degree in Geology;

I have practiced my profession as geologist in, mineral exploration, environment and mineral production over the last 12 years;

I have been working for Falconbridge/Xstrata Nickel From 2000 and 2001 and from 2004 to 2009) as a project geologist and production geologist;

As a Senior Geologist since March 2010, I am a full–time employee of IAMGOLD Corporation/Niobec Inc., Quebec, Canada and I own shares of IAMGOLD Corporation;

I have been involved in 2011 the last tree reserves and resources Estimation for Niobium type mineralization, involve in 2011 rare earth resources calculation and in charge of the REE exploration 2011 drilling campaigns;

As a full-time employee at Niobec mining site, 3 400 chemin du Columbium, St-Honoré de Chicoutimi, Québec, G1V 1L0, and Senior geologist, I daily visit the Niobec Inc. property and operation since march 2010;

I am responsible for the Item 1 to 12 and 15 to 28 of the Technical Report titled: Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013 ;

10.

11.

I am not independent of IAMGOLD Corporation as set out in Section 1.5 of National Instrument 43-101 -as per NI 43-101 s.8.1(2)(f);

12.

13.

At the date of this certificate, to the best of my knowledge, the report entitled: “Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013“contains all scientific and technical information that is required to be disclosed to make the technical report not misleading -as per NI 43-101 s.8.1(2)(i).

14.

I am not aware of any new information on events occurring subsequent to March 18^th, 2013 that could have a material effect on the resource estimates presented in this Document;

Prepared in St-Honoré-de-Chicoutimi the 18^th of March 2013, amended and signed this 19^th day of September 2013,

Signed & Sealed

Jean-Francois Tremblay, geo. (OGQ, #958)

Senior Geologist

Niobec inc. (IAMGOLD)


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		IV
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

CERTIFICATE OF REJEAN SIROIS

I, Réjean Sirois, Vice President, Geology and Resources, at G Mining Services Inc., 1950 Blvd Taschereau, D Building, Suite 200, Brossard, Québec J4X 1C2, hereby certify that regarding the technical report titled “Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013 (the “Technical Report”) by the Company:

I am a registered member of Ordre des Ingénieurs du Québec, # 38754;

I am a member of the Prospectors & Developers Association of Canada, # 14892;

I graduated from the Université du Québec à Chicoutimi in 1983 and have a Bachelor’s degree in Geological Engineering;

I have practiced as a geological engineer since my graduation in exploration and mine geology. Over the last 27 years, I have completed numerous resource estimates for gold, silver, base metals and industrial minerals;

I have been working for G Mining Services Inc. since September 2012 as Vice President, Geology and Resources. I have worked for Cambior/IAMGOLD for 25 years as senior geologist, chief geologist, geology superintendent, mine manager and as Manager – Mining Geology;

I have visited all IAMGOLD`s projects and mines and I have a good understanding of their geological environment. The most recent personal inspection of the TREO project site was in June 2012;

Denis Miville-Deschenes (SVP, Project Development) gave me the following mandate:

Assessment of the various QPs (member of professional association recognized by NI 43-101 and pertinent experience in resource or reserve estimation);

Assessment of the Mineral Resource & Mineral Reserve “MRMR” from each mine or project as December 31^st, 2012;

Make appropriate validation and checks to insure that the MRMR are in line with the CIM standard definitions for Resource and Reserve reporting and can be reproducible.

Validate all the process and assumptions used for resource and reserve estimations and reporting.

Prepare the corporate MRMR statements, the year-end report and sign-off on the IAMGOLD MRMR.

At the date of this certificate, to the best of my knowledge, the report entitled: “Technical report NI 43-101, Updated mineral resource estimate for rare earth elements, 2012, issued date March 18, 2013, amended 19^th September 2013” contains all the necessary information that is required to be disclosed to make the reports not misleading.

I am a “Qualified Person” according to the NI 43-101 definition;

10.

I am independent of IAMGOLD Corporation as set out in Section 1.5 of National Instrument 43-101.

11.

I am a full-time employee of G Mining Services Inc. and do not own shares of IAMGOLD Corporation.

12.

I am responsible for Items 13 and 14 and I have supervised the preparation of the entire technical report and the technical report has been prepared in compliance with NI 43-101.

13.

14.

I am not aware of any new information on events occurring subsequent to March 18^th, 2013 that could have a material effect on the resource estimates presented in this Document;

Effective on this 19^th Day of September 2013

Signed & Sealed

Réjean Sirois, Ing.

Vice President, Geology and Resources

G Mining Services Inc.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		V
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

TABLE OF CONTENTS


Item 1.	SUMMARY	1
Item 2.	INTRODUCTION	4
Item 3.	RELIANCE ON OTHER EXPERTS	4
3.1	Other Data Source	4
3.2	Limited Responsibility of the Authors	5
3.3	Reasonable data verification	5
Item 4.	PROPERTY DESCRIPTION AND LOCATION	5
4.1	Property location	6
4.2	Property description	7
4.3	Mining titles status	9
Item 5.	ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY	12
5.1	Accessibility	12
5.2	Local Resources and Infrastructures	12
5.3	Climate and Physiography	12
Item 6.	History	13
Item 7.	GEOLOGICAL SETTING AND MINERALIZATION	15
7.1	Regional Geology	15
7.2	Property Geology	18
	7.2.1 The St-Honoré alkaline complex	19
7.3	Mineralization	29
	7.3.1 REE mineralization general description	29
	7.3.2 REE mineralized envelope	30
Item 8.	REE deposit Types	34
8.1	REE Major deposit classes	34
8.2	Carbonatite-associated deposits	35
Item 9.	EXPLORATION	37
9.1	Scoping Study	37
9.2	Prefeasibility study	37
9.3	Other field work	37
Item 10.	Drilling	40
10.1	Historical diamond drilling and statistics	40
10.2	Drilling realized by IAMGOLD	40


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		VI
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


10.3	Diamond drill hole summaries	41
10.4	Methodology	43
10.5	Drill hole description, 2012 REE exploration program	44
10.6	Drill holes results, 2012 REE exploration program	46
Item 11.	SAMPLE PREPARATION, ANALYSES AND SECURITY	52
11.1	Sampling Method and Approach	52
	11.1.1 CORE LOGGING	52
	11.1.2 CORE SAMPLING	53
11.2	SAMPLE PREPARATION	58
11.3	ANALYSIS	58
	11.3.1 ICM90A	58
	11.3.2 ICPMS	59
	11.3.3 I CP/OES	59
11.4	SAMPLE SECURITY	60
Item 12.	Data Verification	60
12.1	Verification with laboratory certificates	60
12.2	QA / QC program	61
	12.2.1 Blank sample results and interpretation	61
	12.2.2 OREAS 101a results and interpretation	66
	12.2.3 OREAS 146 results and interpretation	66
	12.2.4 GRE 02 results and interpretation	76
12.3	12.4 Historical Data Verification	76
Item 13.	MINERAL PROCESSING AND METALLURGICAL TESTING	82
13.1	Mineralogy	82
13.2	Metallurgical testwork	82
Item 14.	MINERAL RESOURCE ESTIMATES	82
14.1	Presentation of the REE Zone Mineral Resources Estimates	82
	14.1.1 Methodology	84
	14.1.2 Domain and Volume	86
	14.1.3 Specific Gravity (SG)	87
	14.1.4 Block Model	88
	14.1.5 Grade Interpolation	90
	14.1.6 Classification	93
	14.1.7 Mineral Resource Estimate Statement	94


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		VII
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


	14.1.8 Ressource Sensibility to cut off and elevation	96
Item 15.	Mineral reserves estimates	100
Item 16.	Mining methods	100
Item 17.	Recovery methods	100
Item 18.	Project infrastructure	100
Item 19.	Market studies and contracts	101
Item 20.	Environmental studies, permitting and social or community impact	101
Item 21.	Capital and operating costs	101
Item 22.	Economic analysis	101
Item 23.	ADJACENT PROPERTIES	101
Item 24.	OTHER RELAVANT DATA AND INFORMATION	102
Item 25.	INTERPRETATION AND CONCLUSIONS	103
25.1	Geological compilation:	103
25.2	Drilling	103
25.3	Mineral resources estimation – REE zone	103
Item 26.	Recommendations	105
26.1	Geological compilation and resources modelling	105
26.2	Mineralogical characterisation and metallurgy	105
26.3	Drilling	105
26.4	Cost estimate	106
Item 27.	REFERENCES	107
Item 28.	APPENDIX	110


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		VIII
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

FIGURES LIST


Figure 1: Niobec property location			6
Figure 2: Mining titles and accessibility			8
Figure 3: St-Honoré carbonatite complex and regional geology (modified from Belzile, 2008)			17
Figure 4: The Lapetan rift system (Fournier, 1993)			18
Figure 5: Geological compilation map of the St-Honoré Carbonatite Complex (modified from Soquem map 1978 and Niobec map 1986)			21
Figure 6: Geological schematic block diagram of the St-Honoré Carbonatite Complex (NW-SE cross section)			22
Figure 7: High grade mineralized envelope (>2% TREO)			31
Figure 8: Mineralized massive carbonatite (C1L)			32
Figure 9: Variation of the mineralized clusters composition with depth (Hole# 2012-REE-052)			33
Figure 10: Mineralized cluster composition. (Hole# 2012-REE-033; Bst = bastnaesite; Qz = quartz; Car = carbonate; Hem = hematite)			33
Figure 11: Mineralized carbonatite breccia facies (BRC1L)			34
Figure 12: Schematic section and plan view of a carbonatite complex (SIDEX.ca)			36
Figure 13: High resolution magnetic survey			39
Figure 14: Historical drill hole location, REEs exploration program			42
Figure 15: Drill holes locations, 2011 REEs exploration program			42
Figure 16: Drill holes locations, 2012 exploration program			43
Figure 17: 100m 100m drilling grid, 2012 REE exploration program			45
Figure 18: Sample lenght distribution, REE project			53
Figure 19: Core duplicate QA / QC report, REE project 2012			56
Figure 20: Blank QA / QC report, REE project 2012			63
Figure 21: OREAS 101a QA / QC report, REE project 2012			67
Figure 22: OREAS 146 QA / QC report, REE project 2012			72
Figure 23: GRE 02 QA / QC report, REE project 2012			77
Figure 24: 3D Shape of REE Zone (left) and Niobec mine (right)			87
Figure 25: Histogram of 777 Density Measures			88
Figure 26: TREO indicated resources search ellipse and variography (9900 Level)			92
Figure 27: TREO inferred resource search ellipse and variography (9900 Level)			92
Figure 28: Resource classification, typical section view			94


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		IX
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

TABLES LIST


Table 1: Mineral resource estimate			3
Table 2: Mining titles status. (Property Claims = CDC and CL; Mining leases = BM)			9
Table 3: Previous exploration drilling, Niobec property			15
Table 4: Paragenetic sequence for the REE Zone minerals (Fournier, 1993)			30
Table 5: Historical diamond drilling on the REEs zone			40
Table 6: Drill holes summaries, 2012 REE exploration program			41
Table 7: Drill hole results summary, 2012 REE exploration campaign			47
Table 8: Blank and standard samples values (ppm)			55
Table 9: Internal quality control for sample preparation by SGS Ontario			58
Table 10: Elements analyzed by ICM 90A			59
Table 11: Reporting limits for REE by IMS91B analysis technic			60
Table 12: QA / QC summary, REE exploration program			62
Table 13: Summary of Blanks results, REE project 2012			64
Table 14: Summary of the OREAS 101a QA / QC results, REE project 2012			69
Table 15: Summary of the OREAS 146 QA / QC results, REE exploration project			73
Table 16: Summary of the GRE-02 QA / QC results			79
Table 17: Resource Estimate			83
Table 18: Statistics summary of the original assay intervals used in the 2012 resource estimation			84
Table 19: Composites statistics summary used in 2012 resource estimation			85
Table 20: Variography statistics			86
Table 21: REE zone block model parametres (Exploration metres)			88
Table 22: Block model coding			89
Table 23: Block model attributes			89
Table 24: Interpolation rules			91
Table 25: Resource Estimate			95
Table 26: REE Indicated mineral resources by grade groups			96
Table 27: REE Inferred mineral resources by grade groups			97
Table 28: REE Indicated mineral resources by depth			98
Table 29: REE Inferred mineral resources by depth			99
Table 30: 2012 REE resources and reserves estimation			104
Table 31:presented a cost estimate for three items discussed above			106


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		X
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

APPENDICES LIST


Appendix 1: Main section view and plan view, REE zone 2012			111
Appendix 2: Eon Geoscience Inc. report			126


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		XI
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 1. SUMMARY

In 2012, the geological team of Niobec Inc., a subsidiary of IAMGOLD Corporation Inc., acted as the operator of the Rare Earth Elements (REE) exploration project. The exploration program results and the mineral resources performed on the REE zone are published in a Technical Report complying with the National Instrument 43-101. The authors of the report are Louis Grenier, Geo. and Jean-François Tremblay, Geo. respectively exploration geologist and senior geologist at Niobec mine site. Réjean Sirois, P.Eng., of G. Mining Services Inc. undertook the role of Qualified Person for the work program and the current mineral resource estimate. All data sources come from the surface drilling done in 2011 and 2012, the underground drilling (S-3607) and the historical data since 1968, time of the discovery. The technical information in this report is based upon the information found in the March 18, 2013 technical report of IAMGOLD Corporation entitled “NI 43-101 Technial Report, Surface diamond drilling exploration program for rare earth elements, 2012”. No new technical information is included in this report. This report presents individual grades of the relevant rare earth oxides that form part of the mineral resource.

The Niobec property, which contains the REE zone in a carbonatite complex (St Honoré carbonatite complex), is located thirteen kilometres North of Ville de Saguenay (Chicoutimi), in the limits of the municipality of Saint-Honoré, in the Simard Township, Quebec. This property, held 100% by Niobec Inc., consists of 2 mining leases and 179 claims for 8,010.85 ha. An agreement dated August 31st, 2011 between Niobec Inc. and IAMGOLD granted to IAMGOLD 100% of the beneficial rights to all the non-niobium mineral rights located on the property (including the rights to the REE’s).

The St-Honoré carbonatite complex (SHCC) was discovered by SOQUEM (“Société Québécoise d’Exploration Minière”) in 1967. The SHCC is host in a Precambrian rocks (the Saguenay-Lac-St-Jean anorthosite complex) belonging to the Grenville orogenic province of the Canadian Shield (Figure. 3).

This annular intrusive mass, which is almost completely covered by the Trenton limestone of Paleozoic age, is elliptical in planview. The North-East major axial lengthen approximately 3 kilometres and the intrusive covered a surface of about 8 km². Dated by Potassium-Argon (K-Ar) to be 650 my old, the SHCC is part of the igneous alkaline activity related to a tectonic extension event known as Lapetan rift system of the end of Precambrian.

This Alkaline complex is composed of a central carbonatite core, surrounded by an alkaline syenite, a feldspathoid bearing syenite and syenitic foidites (Ijolites and Urtites). The Greenville basement, constituted in this area by pyroxene syenites, Diorites (with hypersthene or magnetite), syeno-diorite with aegyrine and pyroxene gneiss, is highly fenitized near the contact with the SHCC.

The carbonatite core comprises concentric lenses of calcitites (Sovites) and dolomitites (rauhaugites), interpreted as cones sheets and ring dykes. These units consist of a series of crescentric lenses of carbonatite with compositions younging progressively inwards from calcitite


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		1
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

through dolomitite to ferro-carbonatite. The massive to brecciated ferrocarbonatite, which form the central core, contains the REE mineralization, mainly as REE fluorocarbonates and monazite. The mineralization is disseminated between the dolomite crystal phase in the massive facies or form part of the breccia cement in the brecciated facies. REE mineralization is associated with hematite, chlorite, ferroan dolomite, minor thorite, ilmenorutile and pyrite.

The property has been explored since its discovery in 1967 by SOQUEM and SOQUEM & Associates until 1986. Approximately 3500 metres of diamond drill holes have been realized on the REE Zone. The REE mineralization and its economic aspects were identified.

In 2011, IAMGOLD CORPORATION undertook a first 13,798 m drill reconnaissance campaign (29 drill holes) to a depth of 400 m. Added to the SOQUEM drill holes, a first resource estimation of 466.8 million tonnes at a grade of 1.65% total rare earth oxides (TREO) was reported by P.J. Lafleur Geo-Conseil Inc., in March 2012. In 2012, exploration and definition drilling added 23, 851 m (33 drill holes) and tested the REE zone to a depth of 1,200 m.

The drill program conducted by the company on the REE zone aimed to define the three dimensional geometry of the REE zone, upgrade some inferred into indicated resources, extend the inferred resources to the depth of 700 m, provide samples for metallurgical test work and increased the REE mineralization knowledge. The drill program was completed on a 100 by 100 metres grid down to 400 m and on a 100 by 200 metres grid down to 700 metres. Three holes exceeded 1,000 metres in total length, and reach a maximum length of 1,337 metres. The two deepest holes demonstrated that the REE zone persists uninterrupted at depth, although the resource estimate is reported only to a depth of 700 metres below surface.

Based on these new drilling results, a resource estimate was prepared by Réjean Sirois, Eng., an independent Qualified Person, Vice President, Geology & Resources at G. Mining Services Inc., Brossard, Quebec. The REE resource corresponds to an enriched zone of Light REEs (LREE) which is characteristic of this annular carbonatite type. LREEs comprise 98.3% of the weight of the Total REEs (TREE), with the remaining 1.7% Heavy REEs (HREE) that could potentially add significant economic value. The REE zone is estimated using a cut off grade of 0.5% TREO at 531.4 Million tonnes of Indicated resources at an average grade of 1.64% Total Rare Earth Oxides (TREO) and an Inferred Resources of 527.2 Million tonnes at an average grade of 1.83% TREO, to an approximately depth of 700 metres below surface (as on Table 1).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		2
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 1: Mineral resource estimate

REE Zone Resource Mineral Estimate (cut off @ 0.5% TREO)

Light REO

Heavy REO

Tonnes
Millions

Grade
%
TREO

TREO
Cont.
Millions kg

HREO
(ppm)

Ce₂O₃
(ppm)

La₂O₃
(ppm)

Nd₂O₃
(ppm)

Pr₂O₃
(ppm)

Sm₂O₃
(ppm)

Gd₂O₃
(ppm)

Eu₂O₃
(ppm)

Dy₂O₃
(ppm)

Tb₂O₃
(ppm)

Er₂O₃
(ppm)

Ho₂O₃
(ppm)

Yb₂O₃
(ppm)

Tm₂O₃
(ppm)

Lu₂O₃
(ppm)

Measured

—

Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Measured and Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Inferred

527.2

1.83

9,651.7

277

8046

4298

2968

869

314

141

1.	CIM definitions were followed for Mineral Resources Classification

2.	Mineral Resource were estimated by Réjean Sirois, ing. Vice President, Geology and Resources, G Mining Services Inc.

3.	Mineral Resource are estimated at a cut-off grade of 0.5% TREO

4.	Estimated resource is enclosed within the core of the carbonatite complex and are confined between the bedrock and 700 meters below surface

5.	Numbers may not add due to rounding


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		3
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 2. INTRODUCTION

This report was prepared by the Niobec mine site geological team and summarized the 2012 works conducted on the Rare Earth Elements exploration project for IAMGOLD Corporation. The surface diamond drilling exploration program was achieved about 1 km North of the underground Niobec mine activities, St-Honoré, Quebec. Based on the mining and the metallurgical knowledge, the exploration focused on delimiting and characterizing the rare earth elements mineralized zone while defining and increasing the mineral resources.

Geological data in this report comes from different sources. Over the 35 years of mining at Niobec, internal documents (internal Gems database, internal report, MRNFQ GM filed, historical maps and drilling data, etc.), provided numerous information to the geology department. All the references are available in the Item 23. This report is the results of a compilation and interpretation of the geological description and the geochemical analysis of thirty three new surface diamond drill holes completed in 2012 in a well-known geological environment.

The main authors of the report are M Louis Grenier, Geo. and M Jean-François-Tremblay, Geo., respectively exploration geologist and senior geologist for IAMGOLD on Niobec site. Both supervised all the REEs exploration project operation, conducted by Niobec employees and specialized contractors on mine site, and are responsible for the Item 1 to 28 , except Items 13 and 14, of the report. Réjean Sirois, Eng., Vice President Geology and Resources at G. Mining Services Inc. is responsible for the Item 13 and 14) and supervise the entire report. . All three persons above are qualified persons (QP) according to the NI 43-101 guidelines.

Item 3. RELIANCE ON OTHER EXPERTS

3.1 Other Data Source

The technical material considered in the present report is based on the existing data produced by IAMGOLD. This material includes a technical report complying with the NI 43-101 published in 2009, 2011 and 2012 relating to the Niobec mine, a technical report complying with the NI 43-101 published in 2012 relating to the REEs zone and various other technical reports regarding the St-Honoré Carbonatite Complex hosting the niobium and REEs depots. Item 23 provides a full list of reference documents used in preparing this report. In the production of this NI 43-101 technical report, the authors has relied on the data collected essentially by new drilling on the REEs zone in 2011-2012 and by producing an updated compilation of geological data. Item 13 is based on limited testing for processing methods led by Pierre Pelletier, Eng., working for IAMGOLD.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		4
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

3.2 Limited Responsibility of the Authors

The authors responsibility are limited to making a statement about the mineral resources estimation based on the original data and by applying the best method to create its models. There is no mine plan to estimate the mineral reserves at this stage.

The authors had found the quality of the data to be in good standing. There is no reason to doubt or further investigate its validity based on the evidence available at the time of writing this report. The present report intends to comply with the NI 43-101 rules regarding the production of a Technical Report.

The authors are acting as technical experts in the area of geology and mining only. They has limited legal or financial expertise applied to exploration and mining.

3.3 Reasonable data verification

The authors did verify the data available to them for inconsistencies and database entry errors and applied standard statistical methods commonly used in the exploration and mining industry to characterize the data. Topographic plans, mine plans and maps showing the property limits were used to determine the volume of resources available, but the authors did not verify completely the source of information or the legal status of the property, including the rights to own, explore and extract ore material from the site. The authors are not aware of the existence of any claims on the property due to financial grievances (bankruptcy, mortgage, debts, etc.), liabilities or responsibilities due to environment rules, policies or claims to impeach the development of the project.

The authors’ knowledge of the region satisfied that the geographic, topographic and geologic information used in this report is correct. The results and opinions expressed in this report are dependent on the accuracy of the geological and legal information’s mentioned above, which are up to date and complete at the date of publication of the report. It is understood that no information susceptible to influence the conclusion of the present report were withheld from the study. The authors assert the right, but not the obligation, to modify this report and its conclusions if new information is presented after the date of publication.

Item 4. PROPERTY DESCRIPTION AND LOCATION

This item is partially summarized from the NI43-101 of February 2009 and March 2011, after validation for the mining titles status from the “Ministère des Ressources naturelles et de la Faune” (MRNF. Web site: www.mrn.gouv.qc.ca).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		5
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

4.1 Property location

The Niobec property, which contains the REE Zone and the Niobec mine, is located thirteen kilometres north of Ville de Saguenay (Chicoutimi), in the limits of the municipality of St-Honoré, in Simard Township, Quebec (Figure 1).

Figure 1: Niobec property location

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		6
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

4.2 Property description

The Niobec property is held 100% by Niobec Inc., a wholly-owned subsidiary of IAMGOLD Corporation.

The Niobec mine is located on a property of 8,010.85 hectares comprising two mining leases, No 663 and 706 (with surface area of 79.9 and 49.5 hectares respectively), and 179 claims totaling 7,881.4 hectares. The property was enlarged in 2010 with the acquisition of all rights into 23 claims. In 2011 and 2012, for the purpose of the Niobec Expansion project, 113 news claims were acquired principally on the North and the West area of the mining leases. The mining leases have been renewed until 2015 (Figure 2). At the end of December 2012, four claims were suspended because they were under a new mining leases request at the MRNF.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		7
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 2: Mining titles and accessibility

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		8
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

4.3 Mining titles status

Table 2 describes the Claims and Leases of the Niobec Property, with their location shown on Figure 2. This information was taken from the Quebec Ministry of Natural Resources website http://www.mrnf.gouv.qc.ca/mines/titres/titres-gestim.jsp., with the registration certificates received by the company and validated by the authors as of December 2012.

Table 2: Mining titles status. (Property Claims = CDC and CL; Mining leases = BM)


NTS Sheet	Type of title	Title no.		Status	Registration date		Expiry date		Surface (Ha)		Registered owner (name, number and percentage)
22D11	BM		663	Active		19750116		20150115		79.93	Niobec inc. (88562) 100 %
22D11	BM		706	Active		19800605		20150604		49.52	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		42.4	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		7.41	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		8.42	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		9.4	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		10.4	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		11.63	Niobec inc. (88562) 100 %
22D11	CDC		219814	Active		20100105		20140104		12.34	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		13.34	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		14.31	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		15.29	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		16.27	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		0.54	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		17.26	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		11.14	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		41.07	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		57.05	Niobec inc. (88562) 100 %
22D11	CDC		219815	Active		20100105		20140104		57.05	Niobec inc. (88562) 100 %
22D11	CDC		219816	Active		20100105		20140104		57.05	Niobec inc. (88562) 100 %
22D11	CDC		219816	Active		20100105		20140104		57.05	Niobec inc. (88562) 100 %
22D11	CDC		219816	Active		20100105		20140104		57.04	Niobec inc. (88562) 100 %
22D11	CDC		219816	Active		20100105		20140104		57.04	Niobec inc. (88562) 100 %
22D11	CDC		219816	Active		20100105		20140104		57.04	Niobec inc. (88562) 100 %
22D11	CDC		219816	Active		20100105		20140104		57.04	Niobec inc. (88562) 100 %
22D11	CDC		231429	Active		20110930		20130929		57.01	Niobec inc. (88562) 100 %
22D11	CDC		231429	Active		20110930		20130929		57.01	Niobec inc. (88562) 100 %
22D11	CDC		231429	Active		20110930		20130929		57.01	Niobec inc. (88562) 100 %
22D11	CDC		231430	Active		20110930		20130929		57	Niobec inc. (88562) 100 %
22D11	CDC		231430	Active		20110930		20130929		57	Niobec inc. (88562) 100 %
22D11	CDC		233070	Active		20120125		20140124		8.54	Niobec inc. (88562) 100 %
22D11	CDC		233609	Active		20120316		20140315		56.98	Niobec inc. (88562) 100 %
22D11	CDC		233609	Active		20120316		20140315		56.98	Niobec inc. (88562) 100 %
22D11	CDC		233609	Active		20120316		20140315		56.98	Niobec inc. (88562) 100 %
22D11	CDC		233609	Active		20120316		20140315		9.48	Niobec inc. (88562) 100 %
22D11	CDC		233609	Active		20120316		20140315		8.75	Niobec inc. (88562) 100 %
22D11	CDC		233610	Active		20120316		20140315		7.37	Niobec inc. (88562) 100 %
22D11	CDC		233610	Active		20120316		20140315		6.42	Niobec inc. (88562) 100 %
22D11	CDC		233610	Active		20120316		20140315		5.46	Niobec inc. (88562) 100 %
22D11	CDC		233610	Active		20120316		20140315		4.5	Niobec inc. (88562) 100 %
22D11	CDC		233610	Active		20120316		20140315		3.55	Niobec inc. (88562) 100 %
22D11	CDC		233610	Active		20120316		20140315		2.56	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		41.68	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		30.07	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		15.8	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		10.61	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		11.59	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		39.97	Niobec inc. (88562) 100 %


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		9
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


NTS Sheet	Type of title	Title no.		Status	Registration date		Expiry date		Surface (Ha)		Registered owner (name, number and percentage)
22D11	CDC		234143	Active		20120418		20140417		22.11	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		3.34	Niobec inc. (88562) 100 %
22D11	CDC		234143	Active		20120418		20140417		7.36	Niobec inc. (88562) 100 %
22D11	CDC		234144	Active		20120418		20140417		2.38	Niobec inc. (88562) 100 %
22D11	CDC		234594	Active		20120522		20140521		57.03	Niobec inc. (88562) 100 %
22D11	CDC		234594	Active		20120522		20140521		57.03	Niobec inc. (88562) 100 %
22D11	CDC		234594	Active		20120522		20140521		57.02	Niobec inc. (88562) 100 %
22D11	CDC		234594	Active		20120522		20140521		57.02	Niobec inc. (88562) 100 %
22D11	CDC		234594	Active		20120522		20140521		57.02	Niobec inc. (88562) 100 %
22D11	CDC		234594	Active		20120522		20140521		57.01	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		57.01	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		57.01	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.99	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.98	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.93	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.92	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.92	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.92	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.92	Niobec inc. (88562) 100 %
22D11	CDC		234595	Active		20120522		20140521		56.92	Niobec inc. (88562) 100 %
22D11	CDC		234596	Active		20120522		20140521		56.92	Niobec inc. (88562) 100 %
22D11	CDC		235041	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235041	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235041	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235041	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235041	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235041	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.95	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235042	Active		20120611		20140610		56.94	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.93	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.97	Niobec inc. (88562) 100 %
22D11	CDC		235043	Active		20120611		20140610		56.97	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.97	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.97	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.96	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.96	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.96	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.96	Niobec inc. (88562) 100 %
22D11	CDC		235044	Active		20120611		20140610		56.96	Niobec inc. (88562) 100 %
22D11	CDC		235188	Active		20120619		20140618		57	Niobec inc. (88562) 100 %
22D11	CDC		235188	Active		20120619		20140618		56.99	Niobec inc. (88562) 100 %
22D11	CDC		235188	Active		20120619		20140618		56.99	Niobec inc. (88562) 100 %
22D11	CDC		235194	Active		20120620		20140619		57	Niobec inc. (88562) 100 %
22D11	CDC		235194	Active		20120620		20140619		57	Niobec inc. (88562) 100 %
22D11	CDC		235194	Active		20120620		20140619		57	Niobec inc. (88562) 100 %


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		10
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


NTS Sheet	Type of title	Title no.		Status	Registration date		Expiry date		Surface (Ha)		Registered owner (name, number and percentage)
22D11	CDC		235195	Active		20120620		20140619		56.99	Niobec inc. (88562) 100 %
22D11	CDC		235200	Active		20120620		20140619		56.99	Niobec inc. (88562) 100 %
22D11	CDC		235200	Active		20120620		20140619		56.99	Niobec inc. (88562) 100 %
22D11	CDC		235204	Active		20120621		20140620		56.99	Niobec inc. (88562) 100 %
22D11	CDC		235204	Active		20120621		20140620		56.98	Niobec inc. (88562) 100 %
22D11	CDC		235352	Active		20120629		20140628		57.05	Niobec inc. (88562) 100 %
22D11	CDC		235352	Active		20120629		20140628		57.04	Niobec inc. (88562) 100 %
22D11	CDC		235352	Active		20120629		20140628		57.03	Niobec inc. (88562) 100 %
22D11	CDC		235352	Active		20120629		20140628		57.02	Niobec inc. (88562) 100 %
22D11	CDC		235353	Active		20120629		20140628		57.02	Niobec inc. (88562) 100 %
22D11	CDC		235353	Active		20120629		20140628		57.01	Niobec inc. (88562) 100 %
22D11	CDC		235353	Active		20120629		20140628		57.01	Niobec inc. (88562) 100 %
22D11	CDC		235353	Active		20120629		20140628		57.01	Niobec inc. (88562) 100 %
22D11	CDC		235353	Active		20120629		20140628		47.32	Niobec inc. (88562) 100 %
22D11	CDC		235360	Active		20120703		20140702		57.04	Niobec inc. (88562) 100 %
22D11	CDC		235360	Active		20120703		20140702		57.04	Niobec inc. (88562) 100 %
22D11	CDC		235546	Active		20120718		20140717		57.01	Niobec inc. (88562) 100 %
22D11	CDC		236614	Active		20121009		20141008		57.03	Niobec inc. (88562) 100 %
22D11	CDC		236614	Active		20121009		20141008		57.03	Niobec inc. (88562) 100 %
22D11	CDC		236614	Active		20121009		20141008		57.02	Niobec inc. (88562) 100 %
22D11	CDC		236616	Active		20121009		20141008		57.02	Niobec inc. (88562) 100 %
22D11	CDC		236951	Active		20121106		20141105		57.04	Niobec inc. (88562) 100 %
22D11	CDC		236951	Active		20121106		20141105		57.04	Niobec inc. (88562) 100 %
22D11	CDC		236951	Active		20121106		20141105		57.03	Niobec inc. (88562) 100 %
22D11	CDC		236951	Active		20121106		20141105		57.02	Niobec inc. (88562) 100 %
22D11	CDC		237254	Active		20121210		20141209		57.05	Niobec inc. (88562) 100 %
22D11	CDC		237254	Active		20121210		20141209		57.04	Niobec inc. (88562) 100 %
22D11	CDC		237254	Active		20121210		20141209		57.03	Niobec inc. (88562) 100 %
22D11	CDC		237255	Active		20121210		20141209		57.02	Niobec inc. (88562) 100 %
22D11	CDC		237255	Active		20121210		20141209		57.01	Niobec inc. (88562) 100 %
22D11	CL		268760	Active		19671026		20130913		20	Niobec inc. (88562) 100 %
22D11	CL		271207	Active		19671026		20130913		40	Niobec inc. (88562) 100 %
22D11	CL		271212	Active		19671026		20130914		40	Niobec inc. (88562) 100 %
22D11	CL		271321	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271322	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271322	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271323	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271323	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271324	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271324	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271325	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271325	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271336	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271337	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271337	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271344	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271345	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271345	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271346	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271346	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271347	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271347	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271348	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271348	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271349	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271349	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271354	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271354	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271355	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271355	Active		19671026		20130924		40	Niobec inc. (88562) 100 %


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		11
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


NTS Sheet	Type of title	Title no.		Status	Registration date		Expiry date		Surface (Ha)		Registered owner (name, number and percentage)
22D11	CL		271356	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271356	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271357	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		271362	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271362	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271363	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271363	Active		19671026		20130924		40	Niobec inc. (88562) 100 %
22D11	CL		271364	Active		19671026		20130925		40	Niobec inc. (88562) 100 %
22D11	CL		504459	Active		19891123		20131122		20	Niobec inc. (88562) 100 %
22D11	CL		268760	Suspended		19671026		20130913		21.4	Niobec inc. (88562) 100 %
22D11	CL		271207	Suspended		19671026		20130913		21.4	Niobec inc. (88562) 100 %
22D11	CL		271320	Suspended		19671026		20130924		21.4	Niobec inc. (88562) 100 %
22D11	CL		271320	Suspended		19671026		20130924		21.4	Niobec inc. (88562) 100 %

TOTAL :			181	Titles						8010.85	ha

Item 5. ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY

This item 5 is from NI43-101 Technical Report Niobec Mine 2009 (Belzile E., 2009).

5.1 Accessibility

The Niobec mine is readily accessible by existing paved roads and benefits from available water supply and electric power supply sources. The Niobec mine facilities include a head frame, a pyrochlore-to-niobium pentoxide (Nb₂O₅) concentrator, a concentrate-to-ferroniobium converter and ancillary surface installations.

5.2 Local Resources and Infrastructures

Niobec mine is close to Ville de Saguenay with a population of about 150,000. The city is serviced several times a day by regional airlines from Montreal. It is about a two hours’ drive to Quebec City and five hours to Montreal. Schools (up to University), Hospitals, Governmental services, suppliers and manpower are all available in Ville de Saguenay and at some villages in the vicinity.

5.3 Climate and Physiography

Topography is relatively flat in the vicinity of the mine with an average altitude of 144 metres above sea level. The mine is surrounded by a mix of forest and farms.

The climate of Ville de Saguenay area is temperate with warm summers and cold winters. The mean annual temperature is 2.3°C, with average daily temperatures ranging from -16.1°C in January to +18.1°C in July. The average total annual precipitation is 951 mm, peaking in July (123 mm) and at a minimum in February (51 mm). Snow falls from October to April, with most occurring between November and March. Peak snowfall occurs in December, averaging 82 cm (equivalent to 67 mm of water).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		12
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

The information is based on data collected at the Bagotville meteorological station between 1971 and 2000, as reported by the CRIACC (www.CRIACC.qc.ca).

Item 6. History

Following a regional airborne radiometric survey in search for uranium in 1967, Soquem (Société Québécoise d’Exploration Minière) detected a high-intensity radiometric anomaly near St-Honoré, Quebec (Vallée and al., 1969).

Detailed exploration confirmed the radiometric anomaly (high value of thorium and presence of REE) and revealed a carbonate rock locally poor in REE and radioactive elements. The association of these features with a large roughly circular magnetic anomaly suggested the existence of a large carbonatite and alkaline rock intrusive complex. This anomaly was centered on the core of the complex, now referred to as the REE Zone, and a second radiometric anomaly on the syenite intrusive outcropping through the limestones, southeast of the carbonatite (Vallée and al., 1969).

Magnetic and radiometric anomalies were outlined by geophysical prospecting and, subsequently drilled to delineate two zones of economic concentrations of niobium and one REE enrichment zone.

In 1970, Copperfield Mining joined Soquem to explore and develop this project. Twenty one kilometres of diamond drill holes were realized until 1973 to recognize and delineate the two niobium zones. In parallel, five short drill holes (“Série 700” of REE Zone) totaling 706 metres have been realized between 1968 and 1970 on the Central radiometric and magnetic anomaly allowing the discovery of REE mineralization, grading 1.87% TREO¹.

In 1974, after 700 bench scale tests, 11 months of pilot plant operation and worldwide market research, a joint decision was taken to initiate the development of 1500 t/day, Niobium mine and mill, under the management of Teck Corporation. The construction was completed in early 1976 both on time and within budget.

In 1975, parallel to the Niobium mine development, 8 drill holes (“Série 800”) totaling about 958 metres realized on the central core allowed to recognize the REE Zone, particularly in its north-east part. The recognized REE mineralization gives an average of 5973 ppm in Lanthanides, equivalent to 2.8% TREO².

In 1978, 2 drill holes touched the southern edge of the REE Zone (total of 672 metres) while Soquem was drill testing some exploration targets at the scale of the carbonatite.

¹	In 1970, Vallée & Dubuc reported only 3 drill holes and 328 metres of drilling for that period.

²	In 1986, Dénommé & al reported only 6 drill holes over 585 metres averaging 0.69% La2O3 for 1975.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		13
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

In 1985, three deep drill holes (“Série 85”) totaling 1566 metres have been realized with the aim to extend the recognition on the whole central core, to locate a mineralization with coarser grains of lanthanide and to draw-up a detailed inventory of the various element of lanthanides. This campaign allowed to define a depth limit of 60m for the hematitic weathered facies, to outline lanthanide rich zones (>2%) in the central part and to recognize the same lanthanides mineralogy and grain size down below the weathered hematitic facies (Bastnaesite and monazite in fine needles or in reddish brown-purple accumulations) (Dénommé & al, 1986).

In 1986, Cambior Inc. acquired the Soquem share in the mine and in 2001 Teck Corporation sold their interest to Mazarin Inc. of Quebec City. In December 2003, Sequoia Minerals Inc. was created as the result of a corporate reorganization of the Mazarin Inc. operations whereby the metal and industrial minerals segment (niobium, dolomite and graphite) became a separate corporation (Sequoia).

In 2004, Sequoia Minerals Inc. shareholders voted in favor of a takeover offer by Cambior Inc., clearing the way for the company to take full ownership of North America’s only niobium mine.

In September 2006, IAMGOLD Corporation and Cambior announced their merge to create a new entity. IAMGOLD Corporation Inc. owns 100% of the Niobec mine since November 2006.

In September 2011, Niobec Inc., a 100% IAMGOLD Corporation owned company, is created. Niobec Inc. is the operator of Niobec mine and the owner of the beneficial right of the niobium mineral. In August 31^st, an agreement between Niobec Inc. and IAMGOLD granted to IAMGOLD 100% of the beneficial rights to all the non-niobium mineral rights located on the property (including the rights to the REE’s).

In 2011, after a long quiet period, REEs became in short supply and prices reached historic highs. A new economic interest for the REE Zone by IAMGOLD-Niobec Inc. boosted the exploration interest by the realization of a first drilling campaign of 29 drill holes totaling 13,798 metres to evaluate the REE resources.

In 2012, the exploration program is pursued. A total of 33 new drill holes for 23,851 metres help defined the three dimensional REEs mineralisation geometry, upgrading the majority of the 2011 inferred resources into indicated category, extend the inferred resources to the depth of 700 metres below surface, provide samples for metallurgical test work and increased the REE mineralization knowledge.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		14
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 3: Previous exploration drilling, Niobec property.


Year	Area	Total Holes		Total Metres		Hole numbers	Comments
1967	REE Zone		2		54.86	B802-701, B802-702	First holes on the surface Rare Earth Elements discovery
1968	REE Zone & Niobec deposit		14		2,291	782-701 ext, 782-703 to 715	Follow-up on the REE Zone & discovery of the Niobec deposit
1969	Niobec deposit		5		1,493	782-716 to 782-720	Resource development drilling
1971	Niobec deposit		72		21,301	782-721 to 778; 782-101 to 114	Resource development drilling
1972	Niobec deposit		3		1,214	782-115, 116 & 779 (shaft pilot hole)	Resource development drilling & Shaft pilot hole - Feasibility study to develop an underground mine initiated
1973	Niobec deposit		8		2,901	782-780 to 787, & 782-763 ext.	Resource development drilling
1978	REE Zone		8		957	782-801 to 808	REE Zone
1978	Property		13		3,294	782-901 to 913	Property-wide exploration program
1980	Niobec deposit		15		7,978	E-001 to E-015	Exploration in deposit extensions - West & East
1980	Property		3		935	782-915, 916, 917	Exploration of Niobium satellite zone
1985	REE Zone (deep)		3		1,566	85-1 to 85-3	REE Zone (deep)
2003	Niobec deposit		1		401	E-2003-1	Exploration of Niobec deposit extensions - South
2011	Niobec deposit		15		9,345	2011-NB-001 to 2011-NB-015	Exploration of Niobec deposit extensions – East & West
2011	REE Zone		29		13,798	2011-REE-001 to 2011-REE-028 and S-3607	Exploration of the REE zone
2012	Niobec deposit		3		1,833	2011-NB-015 to 2011-NB-017	Condemnation drilling for future expansion project
2012	REE Zone		33		23,851	2011-REE-029 to 2011-REE-061	Exploration and resources development of the REE zone.

TOTAL			227		93,217	metres

Item 7. GEOLOGICAL SETTING AND MINERALIZATION

7.1 Regional Geology

The Saguenay region is mainly composed of Precambrian rocks (Figure. 3) belonging to the Grenville orogenic province of the Canadian Shield (Roy, 1977; Laurin and Sharma, 1975; Jooste, 1958; Denis, 1937). The metamorphism reached the upper amphibolite-granulite facies and at least three generations of folds are superimposed. More recently, the Grenville province was divided three distinct lithostructural units (modified from Belzile, 2009):

•

The first Unit constitutes a gneiss complex that is divided in three Groups (Groups I, II and III) based on increasing structural complexity from the youngest to the oldest Group. All the rocks from the Group I have been migmatized and deformed during the Hudsonian Orogeny (1,735 million years ago).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		15
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

•

The second Unit is represented by anorthosite and charnockite-mangerite batholiths showing well preserved igneous structures and textures. Anorthosite which range from pre- to post Greenvillian age, are regarded as evidence of crustal extension, the Neohelikian extensional tectonics, which continued during the Grenville Orogeny, 935 million years ago. The mangerites are believed to have been generated by partial melting of the lower crust by the anorthosite bodies, and forms the host rocks of the St-Honoré carbonatite complex.

•

The third Unit is characterized by calc-alkaline intrusions that cross-cut the host rocks. The mineralogy of these intrusions is of superior amphibolite facies. At the beginning of the Palaeozoic (or end of the Precambrian), a younger episode of rifting, south of the Neohelikian rift, referred to as the Lapetan Rift System, resulted in the development of the St-Lawrence River rift system (Figure 4). This tectonic extension event incorporated normal faulting, updoming and igneous alkaline activity (Kumarapeli, 1974), including emplacement of the St-Honoré carbonatite.

The St-Honore carbonatite is dated by Potassium-Argon (K-Ar) to be 650 million years old (Vallée and al., 1969).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		16
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 3: St-Honoré carbonatite complex and regional geology (modified from Belzile, 2008)

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		17
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 4: The Lapetan rift system (Fournier, 1993)

LOGO

7.2 Property Geology

The St.-Honoré alkaline complex is located 13 km NW of Chicoutimi and 5 km West of the town of St.-Honoré. Only few areas of outcrops have been mapped and the intrusive mass is almost completely covered by flat-lying Trenton limestone of Paleozoic age. The core carbonatite intrusion can be interpreted by its regional low magnetic signature and confirmed by numerous exploration drill holes. The intrusion is elliptical in planview, with a north-east major axial length of approximately four kilometres and a surface of about 25 square kilometres.

This alkaline complex intrudes the Grenville basement constituted in this area by pyroxene syenites, diorites (with hypersthene or magnetite), syeno-diorite with aegyrine and pyroxene gneiss (Fortin, 1977).

Carbonatization of the country rocks is interpreted to be a metasomatic alteration product related to the carbonatite complex intrusion (Fortin 1977). This Fenitization is evident from the occurrences of sodic-amphiboles and aegyrine in the host rock, and associated green and red carbonates veinlets (Fortin, 1977).

This carbonatite is known as the host of two individual deposits:


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		18
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

•

Niobium deposit in the south part of the carbonatite, which constitute the principal Niobec mine;

•

REE Zone mineralized in lanthanides elements, located in the central part of the carbonatite.

7.2.1 The St-Honoré alkaline complex

7.2.1.1 Geological Highlights

The first complete geological map, using the different geophysical surveys and drill holes data realized between 1967 and 1975, has been produced by Soquem geologists (Gauthier.A and al.) in 1978. This map, based on petrographic and geochemical studies which allow the definition of the different carbonatite terms (Fortin, 1977), has been actualized and reinterpreted in 1986 by Niobec Mine geology staff using the additional drill holes data realized by Soquem in 1985.

The geological compilation map of Figure 5 is the result of a synthesis of these entire maps and the drill holes data since 1967.

The Alkaline complex is composed by a central carbonatite core, surrounded by mainly an alkaline syenite, a feldspathoid bearing syenite and syenitic foidites (Ijolites and urtites) (Fortin, 1977; Figure 5). The contact of this complex with the country rocks is marked by a phlogopite calcitite in the northern part and in the southern part by the presence of a cancrinite bearing syenite (Dénommé, 1986).

A chronology has been established for this Alkaline complex as follow from older to younger (Fortin, 1977):

Ijolite - Urtite - Foidites syenite – Feldspathoid syenite – Alkaline syenite – Lamprophyre - Carbonatite

Following a petrographic and geochemical study (Fortin, 1977) of different drill holes cores realized in the carbonatite by Soquem (Gagnon and al., 1973), different carbonatite units with different geochemical characteristics have been established. Four Sovites (Calcitites) types and three Rauhaugites (dolomitites) types have been recognized and constitute the different units of the carbonatite core. These units consist of a series of crescent shape lenses of carbonatite with younger compositions progressively inwards from calcitite through dolomitite to ferro-carbonatite (Fortin, 1997). This evolution is attested by the numerous xenolithes of the alkali syenite rocks in the carbonate at the scale complex and at a smaller scale between the different carbonates facies themselves.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		19
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

7.2.1.2 St-Honoré Carbonatite Complex Geometry

The St-Honoré carbonatite complex is composed by a central carbonatite core, surrounded by mainly an alkaline syenite, a feldspathoid bearing syenite and syenitic foidites (Ijolites and urtites), where the elliptical carbonatite core is oriented mainly northeast-southwest (Fortin, 1977). From the center to the periphery (Figure 5), this core includes (Modified from Fortin, 1977):

•

An eccentric core of brecciated dolomitite and ankeritite (C1), containing up to 4.5% total rare-earth elements as Cerium, Lanthanum, Neodynum, Prasaeodymium and Europium in fine-grained fluorocarbonates minerals (Bastnaesite, Synchisite and Parasite (Fournier, 1993),

•

Two low REE and niobium dolomitite in small masses north and south of the brecciated core (C2) and probably a cone sheet of a syenite (S1) to the west,

•

Ring dyke of a low-grade niobium and rare-earth dolomitite (C5) in the north, east and west part,

•

Cone sheet of a high-grade niobium (>0.4% Nb₂O) white to pink dolomitites with apatite and magnetite in the southern sector (C3) enclosing a mega-xenolith of syenite in its southern limit,

•

Cone sheet of pink dolomitites and calcitites (C5’), with high grade niobium mineralization, magnetite, phlogopite and apatite,

•

Cone sheet of a barren red feldspathic dolomitite (C9) south of the mine area (C5),

•

A cone-sheet of phlogopite calcitite at the northern extremity, with disseminated apatite (C4),

•

A cone sheet of pyroxene calcitite, with disseminated apatite in variable thickness, at the southern limit of the core (C6),

•

A circular outer ring containing feldspathic and feldspathoidal alkaline rocks mainly syenite (S1), urtite and ijolite,

•

A triangular mass of cancrinite (Na-Ca-Al-silicate and carbonate mineral) and garnet syenite encountered at the extreme southeast part of the complex (S2).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		20
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 5: Geological compilation map of the St-Honoré Carbonatite Complex (modified from Soquem map 1978 and Niobec map 1986).

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		21
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 6: Geological schematic block diagram of the St-Honoré Carbonatite Complex (NW-SE cross section)

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		22
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Beside these ring-dykes and cone-sheets, numerous calcitic and dolomitic dykes, cogenetic to the dolomitite and calcitite cone-sheets, have been cross-cut by Soquem drill holes (Fortin, 1977).

Regarding the dip of these different ring-dykes and cones-sheets constituting this carbonatite complex, besides the shallow exploration drill holes data of Soquem interpreted with a 70° dipping structures (Vallée and al., 1969), mine drill holes data (surface and underground), show to a depth of 800m, a sub-vertical to 70° dipping to the north of the Mine carbonatite structures (C5 and C3).

Considering the concentric structure of this carbonatite complex, a conical geometry with a strong dip of the different units toward the center of the cones remains the more probable scheme for this carbonatite complex.

A northwest-southeast schematic geological cross section has been established, to better visualize and understand the spatial internal organization of the St-Honoré carbonatite complex (Figure 6).

7.2.1.3 The Carbonatite complex Zoning

Following the petro-geochemical study of the carbonatite complex (Fortin, 1977), zoning seems to manifest itself between the different facies units of the carbonatite regarding their geochemical composition and their chronology:

•

The carbonatite complex has a reniform shape consisting of a central portion of carbonatic rocks enclosed in an alkaline syenite;

•

The age of the different units of the syenite show a chronologic evolution in the following magmatic suite from “Ijolite-Urtite-Foidite (to) syenite-Feldspathoidic syenite (to) Alkali syenite-Lamprophyre-Carbonatite”;

•

The age of the different units of carbonates decreasing progressively inwards from alkali syenite, calcitite through dolomitite to ferro-carbonatite;

•

The carbonatite comprises concentric lens which evolved from calcitite through dolomitite, to a brecciated core of ferrocarbonatite;

•

The carbonatite shows an outward inward carbonate evolution expressed mineralogically by the suite “calcite- dolomite- ankerite-siderite”,

In spite of the similarities with other carbonatite complexes, (1) such as the presence of a carbonatite core bordered by a syenite in Oka, (2) zonality between calcitite and dolomitite as in Firesand carbonatite (Superior province, Ontario), the St-Honoré carbonatite complex is different by the absence of ultramafic rocks as in Oka (Fortin, 1977).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		23
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

7.2.1.4 REE zone geology

7.2.1.4.1 First geology model (Denommé, 1985)

The REE Zone forms the core of the complex (C1), and has an oval shape, elongated towards the northeast with an area of 650 000 m². This zone is differentiated from the Main Zone (Niobec mine area: C3 and C5) by its extensive brecciation, the presence of ankerite and high REE content.

Immediately surrounding it (C1), Dénommé (1985) describes a zone of extensively altered dolomitite, which is brecciated but does not host REE minerals. After the 2011 and 2012 works, this surrounding zone is now called the Transition zone where a variable proportion of mineralized C1 brecciated the adjacent carbonatite facies (C2 and C5) or syenite (S1). REE mineral are observed and the proportion of C1 generally increased toward the core zone. The variable proportion of mineralization in the transition zone created a low grading halo (0.5-1% TREO) around the high grading core (>1% TREO). The economic potential of the Transition zone depend on different factors but must be seriously evaluated.

Three main types of breccia have been distinguished by different authors in the REE Zone:

•

Reddish breccia corresponding to a rich hematitic breccia;

•

Greenish breccia corresponding to a chlorite rich breccia;

•

White to beige breccia, which looks like unaltered breccia.

A more recent petrographic, mineralogical and geochemical study (Fournier, 1993) allows a better description and understanding of the REE Zone.

7.2.1.4.2 Petrographic and mineralogical highlights of the REE zone

At a macroscopic scale and below the paleo-meteoric alteration zone (about 60m below surface), the brecciated dolomitite (C1 facies) is greenish to reddish colored, respectively made by chlorite or hematite present in the matrix, and varies from clast to matrix-supported. The clasts are rounded to sub-angular and composed of dolomite, ferroan-dolomite, ankerite and siderite. They range from 0.25 cm to a few centimetres in diametre but the described thin “horizon” of carbonatite left intact is probably larger clasts of pluri-metres scale. Locally, K feldspar clasts have been signaled in these brecciated facies, particularly in the chloritic breccia (Gauthier, 1979).

Dolomite, ankerite, siderite, calcite, feldspar K, hematite, chlorite, REE minerals (REE fluorocarbonates and monazite), sulphides (pyrite, sphalerite) are the chief minerals in the breccia and occur in varying proportions (Gauthier, 1978; Fournier 1993).

The unbrecciated horizons are whitish to buff colored, and are usually devoid of most of the accessory minerals (minor phlogopite, magnetite and apatite).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		24
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Late, 1-3 mm wide, partially to completely filled veins, containing euhedral calcite, barite and fluorite cut across the brecciated and also across the unbrecciated dolomitite (Fortin, 1977; Fournier, 1993).

The uppermost 60 m of the REE Zone were heavily weathered to an orange or red color as a result of exposure of the carbonatite to the atmosphere prior to deposition of the Trenton limestone. At depth, red staining of carbonates is a more local phenomenon, and the characteristics of the breccia are easier to recognize (Dénommé, 1985; Fournier, 1993).

At the microscopic scale (Fournier, 1993), dolomitite clasts range from an Mg-rich variety to a more iron-rich variety containing significant manganese. They make up a solid solution between dolomitite and ankerite, but some crystals of magnesian siderite are also found.

The carbonates cement of the breccia varies from ferroan dolomite to ankerite but is poorer in Ca than the associated clasts.

The chlorite is brownish colored, iron-rich and locally comprises up to 20% of the rock by volume in interstices between carbonates grains. This contrasts with the Mg-rich, greenish variety, which replaced phlogopite in the Niobium Zone (Fournier, 1993).

The apatite, which classifies as fluorapatite, has higher fluorine content and a more stoichiometric phosphorous content in the REE zone than in the Niobium zone. However, the REE content of apatite from the two zones does not differ significantly.

The principal REE minerals are fluorocarbonates and take the form of needles in radiating bundles or in parallel growth and measure a few microns in diametre and up to 20 micron in length. REE fluorocarbonates minerals are concentrated mainly in the breccia matrix where they are associated with either chlorite, hematite, dolomite or organic matter.

The monazite [(REE,Th) PO₄] occurs as irregular, micron size grains spatially associated with parisite but enclosed in the bastnaesite; and the thorite (ThSiO₄) as micron size, opaque, grains set in either chlorite or organic matter.

The oxide minerals in the REE zone, the hematite, is found either as discrete fine (<0.05 cm) metallic grains (specularite) or as a reddish coating on other minerals. The main sulfide mineral, the pyrite, occurs as euhedral grains (0.02 to 0.05 cm) or stringers of sub- to anhedral crystals in breccia zones.

Euhedral crystals are commonly replaced or surrounded by hematite.

Pyrrhotite and chalcopyrite have also been observed as inclusions within pyrite. The subhedral sphalerite is also encountered with the pyrite in the stringer.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		25
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Anthraxolite, a bituminous hydrocarbon of the asphaltite group, is commonly present in the upper, superficially altered portion of the carbonatite. The occurrence of anthraxolite is not restricted to the REE zone as originally believed, but does appear to be confined to the superficial altered portion of the carbonatite.

Phlogopite in the REE zone is a minor phase which occurs mainly as fine grained in the breccia, surrounded par a chlorite halo.

Rare ilmenorutile, a niobilum-bearing phase, form small euhedral crystals (<0.25 mm) in the breccia.

The occurrence of strontianite, celestite and rhodocrosite has been reported by Gauthier (1979).

Euhedral barite, fluorite and calcite are the late minerals phase and filled the veins and vugs.

7.2.1.4.3 Origin of the core breccia:

From the conical geometry of the REE zone, two mechanisms have been proposed to explain its formation:

•

Contraction cracking due to cooling (Gauthier, 1979),

•

Hydro-brecciation from igneous activity (Fournier, 1993).

Gauthier proposed that the REE zone breccias had formed by contraction during cooling, following the buildup of the multiples cones sheets corresponding to the different breccia facies defined in the deuteritic alteration zone. His model has been abandoned by different author following the results of the deeper drill holes realized since 1985. Regarding the brecciation, it seems unlikely that such a small area of the complex would have been affected by this process, and even less likely that the latter could have caused such intense brecciation (Fournier, 1993).

On the other hand, Fournier in his model of hydro-brecciation considered the brecciation analogous to resurgent boiling in the granitic systems and the residual melt could have saturated with an aqueous phase due to insufficient crystallization of hydrous minerals. Separation of this fluid from the magma could have caused a sharp buildup in pressure, resulting in overpressures that could have exceeded the strength of the carbonatite. If this was the case, hydrofracturing would have initiated, and this could ultimately have led to the production of a breccia pipe by the escaping fluid.

Support for this interpretation is provided by the high proportion of secondary vapor inclusions (Fournier, 1993) in the primary dolomite and ankerite (not reported in Heinritzi and al, 1989).

7.2.1.4.4 Conclusion of the petro-mineralogical study of REE Zone

Petrographic and mineralogical highlights are based over historical works leaded by Fortin (1977), Gauthier (1979) and Fournier (1993). Additional drilling of the REE Zone has been realized recently (2011 and 2012) by IAMGOLD-Niobec. Thus 61 drill holes, totaling 37,649 m of new data, confirmed


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		26
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

and update, particularly at depth, the previous observations. In 2012, IAMGOLD and UQAC (Université du Québec à Chicoutimi) collaborated in a new petrographic, mineralogical and geochemical study. A master project, realised by Alexandre Neron, Geo. Stag. and supervised by Paul Bédard, Ing. Ph.D. will focus on the REE zone and the new drilling datas.

The observation, at a macroscopic scale, of some of the core of these recent drill holes confirm all the macroscopic petrographic data mentioned above with additional and complementary information, thus:

•

These breccia correspond to hydrothermal breccia related to igneous activity, attested by the multiple hydraulic breccia structures;

•

Presence of multiple breccia phases (brecciation of breccia);

•

The REE zone is constituted by mainly ferrodolomitite breccia with the presence locally of, a mineralized or not, calcitite breccia facies;

•

The breccia zone shows the existence of numerous clasts of syenite highly altered corresponding probably to xenoliths;

•

Presence of at least two mineralized phases expressed by the presence of lanthanides in the carbonates elements of the breccia (impregnation) and mainly in the matrix of this breccia;

•

Presence of at least a mineralized alteration front affecting all the core breccia (dolomitic and calcitic) testified by the existence of small barren zones of the different brecciated facies or small patches of different sizes in the mineralized zones.

These observations confirm the existence of multiple stages of igneous activity and a metasomatic replacement characteristic of the carbonatite complexes.

Based on petrographic observations, the paragenesis of REE Zone can be subdivided into four stages (Fournier, 1993):

•

The first consisted of the crystallization of a dolomite low in Nb and REE (C2),

•

This was followed by brecciation (C1) and deposition of synchisite and possibly parisite, monazite and thorite. Ankerite, ferroan dolomite, hematite and chlorite were also introduced in this stage,

•

The next stage consisted of the formation of veinlets of barite, fluorite and calcite,

•

The last event was the meteoric alteration which caused hematization.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		27
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

This model is in accordance with the chronology of the whole carbonatite complex buildup, advanced by Fortin in 1977:

“The setting-up chronology could be, considering the petrographic observations, the geochemical study and carbonates common setting up order:

1.	Sovites (Calcitites) of the south (C6) and the north (C4) of the carbonatite complex,

2.	Rauhaugites (Dolomitite) of the economic zones (C9, C5 and C3) and the low Niobium and REE dolomitite (C5),

3.	Dolomitite of the central zone (C2 and C1 non brecciated),

4.	REE carbonates like cement of the low REE rauhaugites cavities,

5.	Sequent veinlets with calcite, quartz, barite and fluorite”

Apatite-phlogopite geothermometre yielded a magmatic temperatures between 1150 and 800°C for the SHCC. The REE zone temperatures range between 380 and 346°C and reflected the subsolidus conditions. An independent chlorite geothermometre yielded similar temperatures (364 to 321°C) for the REE zone breccia cement (Fournier, 1993).

A satisfactory model for the whole carbonatite is proposed by Fournier (1993) within the framework of his master memory and is resumed by the author as follows:

“REE concentration in the magma was initially buffered by the crystallization of pyrochlore and apatite (Niobium zone), and was subsequently allowed to build up when these phases stopped crystallizing in the most evolved ferrocarbonatite. Saturation of this magma with water, late in its crystallization history, led to the separation of an acidic fluid into which the REE were strongly partitioned in fluorocomplexes. Analogous to boiling in granitic systems, this fluid brecciated the core of the carbonatite, and effervesced, causing an abrupt drop temperature due to adiabatic expansion, which combined with the pH buffering of the fluid by the dolomite, caused the precipitation of the REE as fluorocarbonate minerals”.

It’s important to notice that these REE correspond essentially to LREE (Light REE) which is characteristic of the REE deposit associated to carbonatite, like REE minerals develop in the late stages of carbonatite emplacement (Kupta and Krishnamurthy, 2005).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		28
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

7.3 Mineralization

7.3.1 REE mineralization general description

The principal REE minerals observed in by different authors the brecciated facies of the REE Zone (Vallée & Dubuc, 1970; Nickel & Pinard, 1970; Gauthier, 1979), correspond first to basnaesite and monazite. They are often accompanied with minor amount of pyrrhotite, chalcopyrite, huttonite (ThSiO₄) and molybdenite.

The following information come from a more detailed metallographic study describing the REE minerals (Fournier, 1993). The REE minerals, fluorocarbonates, are needles shaped and formed radiating bundles or growth in parallel. They typically measured a few microns in diametre and up to 20 micron in length. These REE minerals are from a solid solution produced between the Bastnaesite [REEF(CO₃)] and Vaterite (CaCO₃) end-member, including; parasite [(CaREE₂F₂(CO₃)] and synchysite [Ca₂REEF(CO₃)₂] the intermediate members. The REE fluorocarbonates are consisted of an early Ca-rich phase, probably synchisite and possibly parisite, enclosed by a later Ca-poor phase, probably bastnaesite. Additional phase of intermediate compositions, as parasite, may be possible (SEM imaging and qualitative EDS from Fournier, 1993).

Fluorocarbonates minerals are concentrated mainly in the breccia matrix where they are associated with: chlorite, hematite, dolomite or organic matter.

Monazite [(REE,Th)PO₄] and thorite (ThSiO₄) are the second important host of REE after the fluorocarbonates. Monazite occurs, as irregular shaped grains of micron size, spatially associated with parisite but enclosed in the bastnaesite. The thorite occurs as micron scale and opaque grain set in either chlorite or organic matter.

Besides the REE minerals (REE fluorocarbonates and monazite), an inventory of different minerals has been established by different authors:

Carbonates:

Dolomite, calcite, ankerite, siderite.

Fluorocarbonates:

Bastnaesite, synchisite, parasite.

Silicates:

Chlorite and phlogopite, feldspaths (K), quartz, vermiculite (?), zircon, amphiboles, pyroxenes and epidote.

Phosphates:

Monazite and rare apatite.

Oxydes:

Magnetite, hematite, ilmenite, rutile, goethite, pyrolusite and pyrochlore.

Sulfures:

Pyrite, pyrrhotite, sphalerite, chalcopyrite, molybdenite (?)

Others:

Baryte, fluorite, antraxolite, and numerous non identified minerals.

Based on petrographic and metallographic observations, a paragenesis succession (Table. 4) has been established (Fournier, 1993).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		29
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 4: Paragenetic sequence for the REE Zone minerals (Fournier, 1993).


MINERALS	STAGE 1	STAGE 2	STAGE 4
dolomite
Ferroan dolomite
ankerite
chlorite
specularite
synchisite
bastnaesite
monazite
pyrite
phlogopite
apatite
calcite
fluorite
barite
hydrocarbon
hematite
sphalerite

7.3.2 REE mineralized envelope

Considering the REE Zone drill holes compilation map (Figure 14), few drill holes were realized between 1967 and 1985 (totaling 3,902 m). The geometry of the mineralized envelope, draw as the geological core zone (C1), was principally based over the magnetic interpretation (Vallée & Dubuc, 1970).

In 2011 and 2012, 37,370 metres were drilled by IAMGOLD-Niobec. Even if the REE zone limits were better defined by the new drilling program, the mineralized envelope roughly respected the first geological interpretation. The REE deposit have a spherical shape with a North-East elongation on plan view and cover an area at the sub-surface of about 1 km² (Figure 5). The conical shape initially interpreted has changed to a more cylinder geometry down to 400m depth and was confirmed by the 100x100m drilling grid. The 400m to 700m vertical axe is covered by a 100x200m drilling grid. Based on this definition, the mineralized cylinder may be interpreted down to 700m with a high level of confidence. The deepest holes tested the mineralization continuity down to 1200m. Even if the lateral extensions are well defined, the core zone is still open at depth.

The distribution of the overall TREO values (Total REE oxides) varied from 0.01% to 12.34%. The overall average value is 1.75 % TREO. The interpreted high grade, >2% TREO, mineralized envelope (Figure 7) is associated to the brecciated and massive facies of the ferrocarbonatite.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		30
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 7: High grade mineralized envelope (>2% TREO).

LOGO

The massive carbonatite is principally composed of coarse grained iron-dolomite [Ca(Mg,Fe,Mn)(CO₃)₂], sometime ankérite [CaFe(CO₃)₂], pyrite [FeS], barite [BaSO₄] and red/purple colored REE-rich clusters (Figure 8). The calcite [CaCO₃] is partially or completely replaced by siderite [FeCO₃] associated with yellow colored carbonates. The massive C1 facies is cut by late calcite injections, apatite/halite injections and biotite injections associated with fault plans. The open faults have idiomorphic crystals of barite, pyrite, fluorite, halite and strontianite.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		31
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 8: Mineralized massive carbonatite (C1L).

LOGO

The red/purple clusters composition was defined with a portable XRF and with a cartographical technic by u-XRF (UQAC University). They are composed of REE minerals, barite [BaSO₄], calcite [CaCO₃], quartz [SiO₂], hematite [Fe₂O₃] and halite [NaCl] (Figure 9). The proportions of minerals in the clusters are really variable from each to other but more homogeneous over the ore deposit. Around 400m, a differentiation of clusters composition can be identified. In the firsts hundred metres, hematite, calcite and silicate are associated with REE minerals. At depth, past 400m, the halite and the barite appeared in the clusters composition with depletion of calcite and silica. REE minerals proportion, 20% of the cluster, is stable.

The REE minerals composing the clusters are defined by scanning electron microscope (SEM). Small (10-20 microns) needles of bastnaesite [REE(CO₃)F] (Figure 10) and monazite [REEPO₄] are identified (Néron, A. communication, 2013). The exact composition of the bastnaesite should be investigated (by microprobe) to know the Ca proportion in bastnaesite. The bastnaesite is the major REE minerals in the clusters but, at the depth of 900m, the monazite proportion increased.

The massive carbonatite (C1) is brecciated by a fluid similar as the clusters composition and created the breccia facie (BRC1) (Figure 11). The mix of hematite, silice, chlorite/biotite, halite, REE-mineral, pyrite, calcite and/or calcite composed the breccia. The clasts seem from the massive facies and sometimes, but rarely, of syenitic rock. The breccia intensity is variable. Texture changed from 60% matrix supported with small and round shaped clasts to to clasts supported breccia with angular fragments. When the magmatic degree of deformation is low, the C1 clasts can be easily re-built. In general, a transition is observed between the low intensity breccia and the massive C1 facies. When the deformation degree is higher, the breccia intersects the others units, even other breccia facies, with a sharp contact.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		32
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 9: Variation of the mineralized clusters composition with depth (Hole# 2012-REE-052)

LOGO

Figure 10: Mineralized cluster composition. (Hole# 2012-REE-033; Bst = bastnaesite; Qz = quartz; Car = carbonate; Hem = hematite)

LOGO

Like the clusters in the massive unit, the matrix composition varied at depth. The silicate and calcite phases are observed before the 400m limit and the halite and barite phases are found below this limit. The REE minerals are disseminated in the matrix and represent 0.2 to 3 wgt% of the rock. Red to purple agglomerations of REE minerals are visible in the high intensity breccia.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		33
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 11: Mineralized carbonatite breccia facies (BRC1L).

LOGO

The REE mineralisation presented no relationship with the different facies of the core REE zone. Several analyses cumulate during the 2011 and 2012 drilling program show the homogeneity of the mineralization inside the ferrocarbonatite (C1) envelope. The low grade zone, are localized in the periphery and correspond to the transition zone. In this zone, the REE mineralisation is still in the C1 facies. The amount of mineralized C1 intruding the adjacent lithology (C2, C3, C5 and S1) decreased going outward from the center.

Item 8. REE deposit Types

The following is a summary of different papers regarding REE deposits and particularly a recent compilation of the British Geological Survey (BGS) published in November 2011.

8.1 REE Major deposit classes

REE mineral deposits are known (Walters A. & co., BGS) to occur in a broad range of igneous, sedimentary and metamorphic rocks. The concentration and distribution of REE in mineral deposits is influenced by rock forming and hydrothermal processes including enrichment in magmatic or hydrothermal fluids, separation into mineral phases and precipitation, and subsequent redistribution and concentration through weathering and other surface processes. Environments in which REE are enriched can be broadly divided into two categories:

•

Primary deposits associated with igneous and hydrothermal processes, divided into two categories, one associated with carbonatites and related igneous rocks and the other with peralkaline igneous rocks (Samson and Wood, 2004).

•

Secondary deposits concentrated by sedimentary processes and weathering (supergene process).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		34
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Within these two groups REE deposits can be further subdivided depending on their genetic association, mineralogy and form of occurrence.

The worldwide most advanced REE project, including IAMGOLD-Niobec REE project, are listed and could be consulted on the Technology Metals Research website (http://www.techmetalsresearch.com/metrics-indices/tmr-advanced-rare-earth-projects-index/). The Index, last updated on December 29, 2012, currently consists of 49 rare-earth mineral resources, associated with 45 advanced rare-earth projects, 43 different companies and located in 31 different regions within 14 different countries

8.2 Carbonatite-associated deposits

Carbonatites are igneous rocks that contain more than 50 per cent carbonate minerals (IUGS). They are thought to originate from carbon dioxide-rich and silica-poor magmas from the upper mantle. Carbonatites are frequently associated with alkaline igneous provinces and generally occur in stable cratonic regions, commonly in association with areas of major faulting particularly large-scale rift structures.

More than 500 carbonatites occurrences are documented worldwide, with the main concentrations in the East African Rift zones, eastern Canada, northern Scandinavia, the Kola Peninsula in Russia and southern Brazil (Woolley and Kjarsgaard, 2008). Carbonatites take a variety of forms including intrusions within alkali complexes, isolated dykes and sills, small plugs or irregular masses that may not be associated with other alkaline rocks. Pipe-like bodies, which are a common form, may be up to 3-4 km in diametre (Birkett and Simandl, 1999).

Intrusive carbonatites (Figure 12) are commonly surrounded by a zone of metasomatically altered rock, enriched in sodium and/ or potassium. These desilicified zones, known as fenite, develop as a result of reaction with Na-K-rich fluids produced from the carbonatite intrusion.

The REE are largely hosted by rock-forming minerals where they substitute for major ions. Higher concentrations of REE are required to form their own minerals (Miller, 1986). Around 200 minerals are known to contain REE, although a relatively small number are or may become commercially significant.

The REE in carbonatites are almost entirely LREE which occur in minerals such as bastnaesite, allanite, apatite and monazite (Gupta and Krishnamurthy, 2005). REE do not occur naturally as metallic elements, they occur in a wide range of mineral types including halides, carbonates, oxides and phosphates.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		35
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

The vast majority of resources are associated with just three minerals, bastnaesite, monazite and xenotime. In some REE minerals, the LREE are particularly enriched relative to the HREE, which in others the opposite is the case. Bastnaesite and monazite are the primary source of the LREE, mainly Ce, La and Nd. Monazite has a different balance as it contains less La and more Nd and HREE. It is also significant to note that monazite contains the thorium, a radioactive element.

Figure 12: Schematic section and plan view of a carbonatite complex (SIDEX.ca)

LOGO

Schematic section and plan view (mid-level) of a carbonatite complex, showing cylindrical shape of intrusion that evolves upwards into a diatreme breccia and layered tuffs. Late dikes (bold lines) display a radial or concentric pattern. The intrusion consists of three phases: sövite (calcite-rich carbonatite), iron-rich magnesian carbonatite, and ijolite (nepheline-pyroxene rock). The host rocks are fenitized (alkaline metasomatism) and desilicified.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		36
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 9. EXPLORATION

Exploration and resource development drilling is concentrated within the carbonatite complex where the economic concentration of niobium is known. Since 1985, no exploration works for REE have been done until the drilling campaign started by IAMGOLD in 2011 and continues through 2012.

9.1 Scoping Study

Exploration program focused on the REE zone. The drilling program has continuously progressed. The delimitation program, initiated in 2011, ended in May 4^th 2012 by the completion of the hole 2012-REE-039. A total of 10 holes were added in 2012 to the initial 28 holes performed in 2011, including two deep holes (2012-REE-033 and 2012-REE-034), for a total of 22,072 linear metres.

9.2 Prefeasibility study

Since May 5th, 10 other holes have been added to define the REE zone over a 100 x 100 metres drilling grid through the depth of 400 metres and a 100x200 metres drilling grid through the depth of 700 metres. The additional 15, 779 linear metres drilled between May to August are part of the pre-feasibility program. This included the hole from 2012-REE-040 to 2012-REE-061.

Parallel to the surface activities, underground development started in October 2012. An exploration drift was driven through the core of the REE zone. The drift started from the mine level 1150, about 300m below surface, and followed the section 2600E of the exploration grid (Figure 14). Driven from the south, the transitional zone (between Niobec ore zone and REE zone) was crossed and an increasing amount of the REE mineralized carbonatite (C1L) was noted. This unit showed a clear brecciating relationship with the adjacent massive carbonatite (C2). The association between the C2 and the C1 was confirmed. The drift layout was planning to stay in the mineralized carbonatite breccia facies (BRC1L). Before the development completion, some representative mineralized material was stocked and characterized underground. Preliminary assays returned an average value of 2.0% TREO for about 3,500 tonnes bulk sample. This material is reserved for additional metallurgical testworks.

9.3 Other field work

The heliborne high resolution mag survey over the Niobec property was completed by EON geosciences Inc. during May 2012. The complete survey parameter can be consulted in the final report produced by the contractor (Appendix 2).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		37
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

The carbonatite total magnetic field strongly contrast with the grenvillien hosting rock and the new airborne survey confirmed the main geometry of the complex (Figure 13). The high definition aspect outlines small variation inside the carbonatite magnetic signature. Facies variation or structural domain may create this variation. The sensibility of this magnetic survey method is affected by the Niobec mine activities. The anthropic distortion affected the nearby mine area and complicated the interpretation.

The final data has been treated by Mark Goldie, IAMGOLD chief geophysicist, and sent to Niobec geological team for validation and exploration duty. This new information, coupled with the surface diamond drilling will be used to update the Niobec geological map.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		38
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 13: High resolution magnetic survey.

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		39
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 10. Drilling

10.1 Historical diamond drilling and statistics

The St-Honoré carbonatite complex is covered by a layer of Paleozoic sediment variable in thickness. Historically, the REE zone could be studied with one outcrop located in the North-East area of the core zone but the discovery showing was covered by a layer of overburden moved during the mine operation. Diamond drilling is the best and the only method of investigation used by IAMGOLD and the various site operators.

In 1967 the drilling program tested the new radiometric anomaly discovered. Few short hole confirmed the anomalous REEs concentration in the ferrocarbonatite. In 1975, a preliminary definition of the core zone (C1) was completed. In 1985, Soquem completed three long hole to characterised and test the continuity at depth of the REEs zone. The compilation map, show the historical drill holes location (Figure 14).

After a latency period of 26 years, IAMGOLD decided to launch a large diamond drilling program stimulated by a favorable REEs economical context. In the last two years (2011 and 2012) 90% of the data on the REEs zone was collected (Table 5).

Table 5: Historical diamond drilling on the REEs zone.


Company name	Year		Number of Drill Holes		Average LENGTH		Longest DH LENGTH		Total LENGTH (metres)		% of Total LENGTH
SOQUEM		1968		5		141		226		706		1.7	%
SOQUEM		1975		8		120		148		958		2.3	%
SOQUEM		1978		2		336		443		672		1.6	%
SOQUEM		1985		3		522		559		1,566		3.8	%
IAMGOLD		2011		29		476		898		13,798		33.2	%
IAMGOLD		2012		33		723		1,337		23,851		57.4	%

		Grand Total		80		519		1,337		41,551		100.0	%

10.2 Drilling realized by IAMGOLD

Drilling was performed between March 6, 2011 and October 9, 2012 over the Niobec property and specifically over the REEs zone. The first resource estimation (Lafleur, P.J. and al., 2012) was calculate with the data of the surface holes 2011-REE-001 to 2011-REE-028, and the underground hole S-3607. The program continued in 2012 with the realization of the holes 2012-REE-029 to 2012-REE-061. The 33 new holes, for a total of 23, 851 metres, were drilled under the supervision of Niobec geological team and are the object of this present report.

The objectives were to define the geological model, upgrade the resource definition for a new resource calculation and test the REE mineralization continuity at depth. The deeper holes demonstrate the uninterrupted extension of the REE zone at depth, although the resource estimate reported only to 700 metres below surface.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		40
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

10.3 Diamond drill hole summaries

The diamond drill holes have been localised by the Niobec mine surveyor team. The data is summaries in Quebec MTM83, zone 7, system (Table 6 and Figure 15 & Figure 16) but an exploration grid coordinate system was daily used.

A summary of each diamond drill hole realized in 2012 is available below in the 13.5 section.

Table 6: Drill holes summaries, 2012 REE exploration program.


	Explo grid (m)										Quebec MTM83, Zone 7 (m)
HOLE-#	Easting		Northing		Altitude		Az (°)		Dip (°)		Easting		Northing		Altitude		Title #		LENGTH
2012-REE-029		2297.71		5497.56		9999.00		122.90		-49.50		255975.73		5378378.41		142.44		2713202		651.00
2012-REE-030		2404.23		5493.02		9999.10		228.30		-49.60		256064.70		5378319.66		142.56		2713201		639.00
2012-REE-031		2313.04		5681.04		9999.70		234.40		-50.20		256083.37		5378527.79		143.14		2713201		597.00
2012-REE-032		2483.46		5783.49		10001.90		269.50		-49.30		256282.22		5378527.83		145.33		2712072		651.00
2012-REE-033		2503.80		5349.16		9997.40		3.60		-70.00		256075.95		5378145.06		140.84		2713201		1338.00
2012-REE-034		2676.56		5882.25		10010.40		178.80		-76.30		256498.52		5378513.03		153.84		2687602		1260.00
2012-REE-035		2436.84		5162.36		9997.20		352.90		-53.00		255922.35		5378019.43		140.64		2713201		924.00
2012-REE-036		2604.64		5304.95		9998.50		1.00		-51.20		256139.63		5378055.23		141.94		2712072		900.05
2012-REE-037		2300.00		5298.00		10000.00		358.20		-50.80		255874.00		5378202.00		142.24		2713202		798.00
2012-REE-038		2700.13		5300.09		9998.80		2.30		-51.40		256218.97		5378001.88		142.24		2712072		402.00
2012-REE-039		2213.69		5290.45		10000.20		0.00		-50.30		255797.05		5378244.00		143.64		2713202		564.00
2012-REE-040		2689.67		5554.18		10000.30		1.80		-50.60		256340.87		5378225.07		143.74		2712072		729.00
2012-REE-041		2606.09		5599.77		10000.20		1.00		-50.00		256292.71		5378307.19		143.64		2712072		774.00
2012-REE-042		2505.92		5602.33		9999.80		0.00		-52.60		256208.17		5378339.99		143.24		2712072		992.00
2012-REE-043		2317.70		5592.15		9999.70		359.30		-52.30		256042.93		5378447.93		140.19		2713201		741.00
2012-REE-044		2405.52		5790.37		10000.90		358.80		-52.50		256218.95		5378573.87		144.35		2713201		516.00
2012-REE-045		2505.44		5792.16		10003.80		2.70		-52.70		256305.52		5378523.95		147.26		2712072		501.00
2012-REE-046		2506.75		5411.66		9997.90		359.40		-51.20		256110.67		5378197.12		141.31		2713201		873.00
2012-REE-047		2405.69		5392.44		9998.50		0.50		-51.50		256014.15		5378232.69		141.92		2713201		903.00
2012-REE-048		2603.82		5804.62		10006.80		2.50		-50.50		256396.27		5378483.95		150.25		2712072		591.00
2012-REE-049		2605.78		5398.70		9998.70		358.00		-50.00		256188.71		5378134.72		142.19		2712072		900.00
2012-REE-050		2700.00		5740.00		10000.00		269.10		-46.20		256449.65		5378369.66		146.89		2687602		598.50
2012-REE-051		2703.04		5838.05		10006.85		0.50		-51.50		256498.54		5378461.51		150.29		2687602		351.00
2012-REE-052		2707.08		5399.67		9996.33		359.90		-59.90		256276.22		5378083.66		139.78		2712072		900.00
2012-REE-053		2808.41		5797.49		10006.99		358.70		-50.70		256567.96		5378372.47		150.44		2687602		453.00
2012-REE-054		2762.74		5286.72		9995.76		2.30		-51.00		256265.76		5377958.18		139.21		2712072		900.00
2012-REE-055		2314.18		5686.32		9997.50		271.90		-45.40		256087.07		5378531.73		140.94		2713201		276.00
2012-REE-056		2314.62		5686.36		9997.40		277.90		-75.00		256087.47		5378531.53		140.84		2713201		549.60
2012-REE-057		2812.46		5385.11		9996.85		1.00		-50.00		256359.05		5378016.91		140.30		2687602		643.40
2012-REE-058		2330.91		5487.03		9996.12		264.50		-50.90		255998.77		5378352.29		139.57		2713202		351.00
2012-REE-059		2803.26		5489.53		9996.77		359.90		-59.90		256404.94		5378111.15		140.22		2687602		892.60
2012-REE-060		2331.54		5487.06		9996.26		273.50		-75.20		255999.33		5378351.98		139.70		2713202		500.00
2012-REE-061		2314.81		5208.89		9998.17		359.90		-59.90		255841.72		5378122.17		141.62		2713202		1191.00


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		41
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 14: Historical drill hole location, REEs exploration program.

LOGO

Figure 15: Drill holes locations, 2011 REEs exploration program.

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		42
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 16: Drill holes locations, 2012 exploration program

LOGO

10.4 Methodology

The Niobec exploration geologist, hired in March 2012, was responsible for all the steps necessary for the realization of a surface diamond drilling program. This included the drill set-up recognition, the permiting, the positioning and orientation of the drill, the supervision of drilling methods, the procedures application, the supervision of the health and safety rules, the environmental compliance and the restoration of the drill sites. Drill holes are planned by the Niobec mine geology team and approved by the IAMGOLD exploration general manager.

The services of a contractor, IOS Services Géoscientifiques Inc. (“IOS”), were used to support the REE exploration program. IOS carried out core logging, sampling and shipping of the samples to the laboratory and worked in close collaboration with the Niobec mine geology team. .

The exploration geologist was also looking after the quality assurance and the quality control (QA/QC) for the REE Zone. That included the purchase of standardized material, the preparation of the blanks and compilation of results. Any samples for REE assays were performed at the Niobec mine laboratory, the entire drilling core samples were sent to SGS facilities, Lake Field Ontario after been logged, cut and bagged. See Item 16 for the details QA/QC procedures.

The whole drilling campaign has been realized by “Forage Boréal Inc.”, a drilling company located in Val d’Or, Abitibi, Québec. The exploration grid was generally used has reference. At the end of 2012, drilling grid respected a 100 by 100 metres spacing. The main direction of drilling was N031° (N000° on the exploration grid) with a magnetic declination of 18° West, and a dip generally toward the North. Deviation was measured with a multishot survey (Reflex EZ-shot) done after the end of each hole. No additional in-hole survey was performed in the existing drill holes from 2011.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		43
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

In 2011, all the casing located in the farmed field has been pulled out after the holes were finished. From the hole 2012-REE-033, most of the casing were kept for further surveys (position, radiometry, geophysics, etc.) or other verifications can be made on selected holes.

Drilling was done in the field next to the mine office parking. The core shack is on the mine site, less than 1 kilometre from the drill rig. Core is retrieved from the drill rods using conventional wire line techniques. The core is removed from the core barrel by the drill contractor employee and carefully placed in standard NQ wooden core boxes. A wooden bloc with the depth written on it is put in the box at the end of each run (3 metres). Once filled, core boxes are closed and sealed. Boxes are removed from the drill site twice daily (at the end of each work shift) by the drilling contractor personnel and delivered to the core shack. Verification of all the boxes is proceeded (Inscription on the boxes, core length and tags, continuity between the boxes, etc.).

10.5 Drill hole description, 2012 REE exploration program

The location of each drill hole and an overview of the 100m x 100m drilling grid realised during the 2012 exploration program can be consulted at Figure 17. The dilling sections figures covering the main area of the REE zone, is also available on appendix 1.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		44
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 17: 100m 100m drilling grid, 2012 REE exploration program.

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		45
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

10.6 Drill holes results, 2012 REE exploration program.

The 2012 exploration and definition drilling program confirmed the REE mineralisation distribution homogeneity. The 100 x 100 metres drilling grid performed help the geology team to define the core of the REE rich carbonatite and the relationship with the surrounding units. The transition zone returned interesting results on large interval and must be evaluated for it economic value.

The new 100m x 100m drilling pattern increased the resource confidence from sub-surface to 350m below. The 2011 inferred resources were all transformed in indicated resources. The drilling accuracy from 350m to 700m, 100m x 200m drilling grid, added inferred resources at depth. Even if the resource estimate was limited to 700m, the deepest holes confirmed the mineralisation continuity down to 1200m below surface.

Mineralogical studies are under progress to evaluate the REEs mineral affinities and distribution. The 2012 drill hole reached deeper than ever historically. Preliminary interpretation based on the core description and assay results show a relationship between the REEs mineral content and the deepness. Pass 1000m deep, the texture of the hosting carbonatite and the lanthanide minerals change. Simultaneously, the average REE content slightly increased. This observation are currently investigated and tested by a master project conjointly realised by IAMGOLD-Niobec and the UQAC University.

The deep holes also tested gravimetric anomaly hypothesis. In 2011, based on theory projection, an ultra-mafic source, located at the base of the Saint-Honoré carbonatite complex, was interpreted to be the explanation of the gravimetric anomaly. Excepted few angular enclaves of mafic to ultra-mafic rock intercepted by drilling and observed in the drift, no major units was discovered. The ultra-mafic basement theory may be transferred to a lower level. The geophysics interpretations plan the anomaly around 500m deep. This may be explained by the vertical distribution of the barium. From the surface and down to 200m, the barium is completely depleted. Assays are returning value under the limit detection. Abruptly, the average barium contain rise above 3%, higher than all the other carbonatite facies of the complex. The phenomenon is also slightly observed in the rock density.

Over all, the 2012 drilling exploration program returned excellent results and a lot of new geological data that will be interpreted in 2013. Each drill hole results are summarised in Table 7 below.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		46
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 7: Drill hole results summary, 2012 REE exploration campaign.


HOLE #	From (m)		To (m)		Lenght (m)		TREO (%)		HREO (%)		LA2O3 (PPM)		CE2O3 (PPM)		PR2O3 (PPM)		ND2O3 (PPM)		SM2O3 (PPM)		EU2O3 (PPM)		GD2O3 (PPM)		TB2O3 (PPM)		DY2O3 (PPM)		NB2O5 (PPM)		MO (PPM)
2012-REE-029		44.5		651		606.5		1.348		0.031		3134.179		6373.003		708.999		2621.721		301.053		66.208		160.424		17.852		63.785		1602.525		104.750
including
		44.5		450		405.5		1.704		0.037		4028.978		8085.264		889.943		3259.118		366.437		80.559		196.068		21.968		75.272		1514.108		116.286
		450		651		201		0.616		0.017		1291.947		2847.761		336.466		1309.434		166.438		36.662		87.040		9.377		40.135		1784.559		81.000
2012-REE-030		52.5		639		586.5		0.991		0.027		2254.773		4665.385		534.016		1916.772		231.980		54.440		128.701		15.953		67.702		1525.154		62.945
including
		52.5		330		277.5		1.564		0.035		3654.043		7450.806		841.897		2964.794		343.897		78.498		178.680		19.915		70.977		1192.417		97.021
		330		423.9		93.9		0.592		0.032		1275.391		2671.251		297.700		1096.762		152.924		42.481		124.519		21.797		126.604		2503.195		24.688
		423.9		639		215.1		0.405		0.014		824.362		1837.771		228.537		883.857		117.894		27.678		63.922		8.073		37.156		1534.119		34.514
2012-REE-031		65.3		597		531.7		1.284		0.025		2682.281		6029.893		730.834		2809.689		317.195		67.908		136.238		12.356		36.086		1267.224		155.945
including
		65.3		261.3		196		2.142		0.036		4805.437		10164.129		1198.715		4406.347		473.565		99.394		194.402		17.045		46.363		880.446		245.574
		261.3		527.4		266.1		0.833		0.019		1545.688		3840.351		490.087		2004.733		237.655		51.547		105.186		9.467		28.176		1219.820		114.371
		527.4		597		69.6		0.526		0.017		881.534		2435.775		297.943		1270.869		169.110		39.369		86.590		9.784		36.296		2538.883		56.167
2012-REE-032		47.6		651		603.4		1.441		0.028		3249.840		6816.394		799.527		2913.733		324.804		68.538		145.393		14.609		48.701		1640.016		166.000
including
		47.6		402		354.4		2.122		0.034		4857.683		10117.557		1176.361		4255.378		457.286		93.042		188.689		16.642		41.204		835.544		240.189
		402		453		51		0.670		0.017		1459.067		3060.486		377.255		1440.823		175.988		42.230		89.294		8.734		30.042		1709.393		136.588
		453		651		198		0.382		0.019		739.025		1681.674		211.721		813.109		118.245		30.018		79.810		12.365		67.366		3109.202		36.439
2012-REE-033		42		1338		1296		2.160		0.032		5845.375		10515.933		1077.193		3461.655		343.496		80.095		169.741		17.496		57.317		1466.517		113.088
including
		42		162		120		1.227		0.024		3245.308		5728.377		626.528		2151.294		253.766		54.072		123.839		13.223		48.230		2269.045		78.488
		162		1002.4		840.4		2.132		0.037		5516.814		10318.611		1095.450		3605.905		379.035		89.644		194.732		20.522		68.293		1657.884		138.132
		1002.4		1338		335.6		2.580		0.023		7653.269		12818.532		1201.218		3592.760		287.868		65.870		124.139		11.490		33.112		682.034		63.088
2012-REE-034		21.4		1260		1238.6		1.885		0.031		4445.759		9032.327		1026.313		3598.090		411.689		87.729		169.188		14.138		42.016		799.687		193.955
including
		21.4		75.7		54.3		2.401		0.051		5766.956		11239.975		1250.392		4601.679		623.749		136.757		285.121		22.657		61.673		1167.007		217.737
		75.7		999		923.3		1.752		0.031		4004.721		8369.394		969.277		3445.615		405.310		85.937		167.060		13.742		40.955		801.809		204.863
		999		1260		261		2.250		0.029		5749.014		10942.854		1183.232		3929.229		388.403		83.490		151.549		13.706		41.554		711.809		149.391
2012-REE-035		60		924		864		1.831		0.030		4965.686		8854.602		902.485		2953.771		304.115		70.973		159.345		16.626		52.504		1686.969		98.057
including
		60		194.2		134.2		0.410		0.017		972.154		1767.636		206.673		811.007		144.335		35.255		83.479		9.355		37.996		1895.476		9.404
		194.2		438		243.8		1.315		0.028		3161.382		6256.566		677.683		2460.103		279.398		64.789		147.020		15.992		56.736		1908.404		99.282
		438		924		486		2.501		0.035		7032.728		12211.697		1216.492		3818.448		362.361		84.332		187.304		19.023		54.456		1513.504		122.679


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		47
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


HOLE #	From (m)		To (m)		Lenght (m)		TREO (%)		HREO (%)		LA2O3 (PPM)		CE2O3 (PPM)		PR2O3 (PPM)		ND2O3 (PPM)		SM2O3 (PPM)		EU2O3 (PPM)		GD2O3 (PPM)		TB2O3 (PPM)		DY2O3 (PPM)		NB2O5 (PPM)		MO (PPM)
2012-REE-036		42.2		900		857.8		1.810		0.031		4238.809		8663.008		986.707		3473.669		402.684		85.443		165.244		14.490		46.710		1113.508		210.137
including
		42.2		234		191.8		0.636		0.016		1462.590		2866.975		342.052		1331.265		173.239		38.106		77.435		7.673		32.483		2030.175		73.500
		234		900		666		2.141		0.035		5017.002		10285.198		1168.058		4088.740		467.129		98.757		188.297		16.208		50.838		853.851		248.841
including		766.5		900		133.5		2.828		0.050		7023.867		13250.042		1522.454		5299.775		655.051		140.006		267.689		21.869		68.224		749.341		370.800
2012-REE-037		69.5		798		728.5		2.263		0.031		5861.642		10967.245		1180.464		3916.453		382.952		80.742		169.821		15.752		41.317		1347.947		183.125
including
		69.5		132.2		62.7		1.046		0.036		2306.098		4767.643		564.412		2124.404		305.716		76.897		184.314		23.177		75.956		2011.578		19.273
		132.2		798		665.8		2.382		0.030		6207.757		11570.746		1240.433		4090.900		390.471		81.116		168.410		15.029		37.945		1283.345		199.075
2012-REE-038		38		402		364		0.661		0.014		1611.725		3091.157		344.779		1245.528		157.376		33.212		72.368		7.262		26.442		2263.578		50.349
including
		38		357		319		0.600		0.014		1462.768		2797.869		312.368		1130.435		146.954		31.896		70.666		7.147		25.906		2381.993		40.945
		357		402		45		1.077		0.016		2635.807		5107.514		567.604		2036.792		229.023		42.264		84.069		8.057		30.127		1449.479		115.000
2012-REE-039		55.7		564		508.3		1.803		0.031		4679.364		8606.867		923.599		3146.583		337.973		75.030		167.096		16.991		52.980		1321.855		170.831
including
		55.7		207		151.3		1.181		0.032		2300.214		5416.946		715.919		2693.667		332.719		74.709		153.143		18.637		70.627		1166.951		85.692
		207		564		357		2.072		0.031		5710.329		9989.166		1013.593		3342.847		340.249		75.169		173.142		16.277		45.334		1388.980		207.725
2012-REE-040		11.8		729		717.2		2.134		0.028		5688.182		10235.403		1098.327		3632.370		385.490		76.640		150.277		13.143		37.933		1166.505		160.263
including
		11.8		102.7		90.9		2.203		0.032		5818.786		10385.595		1171.415		3877.123		430.868		87.749		176.819		14.711		44.437		1106.511		75.875
		102.7		729		626.3		2.124		0.027		5669.098		10213.457		1087.648		3596.607		378.859		75.017		146.398		12.913		36.983		1175.271		172.594
2012-REE-041		36.2		734.1		697.9		1.798		0.029		4550.507		8541.979		963.349		3247.782		352.999		76.355		157.942		14.528		42.816		1336.110		196.819
including
		36.2		99.7		63.5		2.281		0.038		5967.282		10879.596		1127.761		3993.264		431.692		95.055		203.332		19.881		60.149		1848.368		81.773
		99.7		539.7		440		1.944		0.031		4823.187		9212.515		1038.420		3637.374		395.208		84.208		168.773		14.566		43.348		1328.648		246.568
		539.7		734.1		194.4		1.323		0.022		3498.657		6326.291		746.766		2158.662		235.674		53.214		119.686		12.712		36.051		1186.620		125.765
2012-REE-042		41.6		992		950.4		1.652		0.026		4202.827		7778.259		871.851		3037.856		345.740		70.725		142.732		12.975		37.289		1127.197		200.073
including
		41.6		609		567.4		1.934		0.033		4768.926		9071.886		1040.186		3673.287		428.364		87.760		180.800		16.641		47.421		1092.736		247.313
		609		992		383.0		1.213		0.016		3320.766		5762.608		609.563		2047.767		217.000		44.181		83.417		7.263		21.504		1180.893		126.465


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		48
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


HOLE #	From (m)		To (m)		Lenght (m)		TREO (%)		HREO (%)		LA2O3 (PPM)		CE2O3 (PPM)		PR2O3 (PPM)		ND2O3 (PPM)		SM2O3 (PPM)		EU2O3 (PPM)		GD2O3 (PPM)		TB2O3 (PPM)		DY2O3 (PPM)		NB2O5 (PPM)		MO (PPM)
2012-REE-043		57		741		684		2.066		0.035		4957.054		9765.763		1127.172		4004.841		441.996		93.529		187.817		16.835		49.154		1062.659		289.150
including
		57		125		68		2.499		0.041		5555.374		12010.715		1416.594		5032.172		538.967		111.060		221.854		20.468		61.576		742.318		70.565
		125		741		616		2.019		0.034		4891.524		9519.887		1095.473		3892.324		431.375		91.609		184.089		16.437		47.793		1097.744		313.090
2012-REE-044		35.3		516		480.7		1.834		0.025		4739.873		8744.721		958.512		3288.621		333.015		67.160		137.480		12.809		36.550		1201.658		186.920
including
		35.3		82.3		47		2.328		0.040		5334.162		10967.087		1319.208		4720.602		513.450		104.342		228.026		20.910		51.646		1073.609		26.611
		82.3		516		433.7		1.772		0.024		4666.099		8468.841		913.736		3110.858		310.616		62.544		126.239		11.804		34.676		1217.554		206.821
2012-REE-045		52		498		443		1.701		0.027		4215.571		8087.065		912.536		3167.346		333.968		68.287		145.752		13.996		41.309		1443.085		166.767
including
		52		114		62		3.120		0.063		7766.549		14405.631		1677.456		5969.648		709.019		151.854		347.212		33.653		96.242		1929.914		123.524
		114		378		261		1.707		0.023		4360.870		8215.149		892.861		3044.909		303.714		60.147		123.097		11.833		34.740		1190.502		201.596
		378		498		120		0.943		0.017		2028.018		4484.832		554.731		1968.559		204.381		42.525		90.394		8.489		27.085		1749.496		111.975
2012-REE-046		32		873		841		2.064		0.037		5197.705		9873.396		1096.666		3664.785		411.314		91.333		200.771		20.076		59.542		1555.183		163.477
including
		32		54		22		1.543		0.032		3922.925		7282.435		819.223		2727.873		329.040		73.673		174.189		17.697		51.502		2110.024		78.250
		54		873		819		2.080		0.037		5234.789		9948.769		1104.738		3692.041		413.707		91.847		201.545		20.145		59.776		1539.042		165.956
2012-REE-047		50		903		853		2.251		0.035		5779.675		10787.853		1169.715		3988.301		411.443		87.039		185.872		18.412		54.407		1275.930		201.412
including
		50		84.4		34.4		1.576		0.048		3539.068		7237.611		873.237		3166.275		424.596		101.719		265.368		28.510		88.460		3042.396		39.231
		84.4		903		818.6		2.282		0.034		5884.451		10953.872		1183.579		4026.741		410.828		86.353		182.155		17.940		52.814		1193.325		208.996
2012-REE-048		44		591		547		1.875		0.032		4827.978		8884.412		969.728		3335.786		394.829		85.674		169.274		15.947		45.457		1069.440		195.538
including
		44		351		307		2.366		0.041		5977.048		11220.533		1230.490		4275.446		518.105		113.335		221.009		20.642		57.839		1134.487		242.509
		351		567		216		1.259		0.019		3391.431		5948.151		642.049		2154.403		237.398		50.161		102.823		9.975		29.904		978.042		136.736
		567		591		24		0.921		0.015		2531.723		4357.162		463.738		1517.753		178.290		38.791		81.836		7.482		21.376		1030.157		102.375
2012-REE-049		36.9		900		863.1		1.985		0.033		4869.800		9462.630		1059.974		3692.666		418.052		87.404		177.158		15.355		45.431		1065.381		174.891
including
		36.9		175.6		138.7		1.030		0.018		2584.743		4816.890		554.194		1920.640		226.849		47.837		95.523		8.129		26.875		1576.826		133.792
		175.6		900		724.4		2.172		0.035		5315.665		10369.115		1158.662		4038.428		455.359		95.124		193.087		16.764		49.052		965.587		182.911
2012-REE-050		15.3		598.5		583.2		1.734		0.026		4613.005		8300.198		874.151		2950.357		329.761		69.161		139.745		11.817		34.719		1088.701		149.357
including
		15.3		69		53.7		1.596		0.017		4062.925		8075.245		795.816		2581.347		258.013		48.199		88.247		7.913		25.608		1705.007		34.938
		69		428.5		359.5		1.998		0.029		5400.197		9536.751		1000.388		3371.494		367.086		77.803		156.839		13.223		38.085		1199.604		177.808
		428.5		598.5		170		1.203		0.021		3068.217		5697.269		623.699		2144.532		269.110		56.319		117.110		9.863		29.978		679.672		119.603


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		49
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


HOLE #	From (m)		To (m)		Lenght (m)		TREO (%)		HREO (%)		LA2O3 (PPM)		CE2O3 (PPM)		PR2O3 (PPM)		ND2O3 (PPM)		SM2O3 (PPM)		EU2O3 (PPM)		GD2O3 (PPM)		TB2O3 (PPM)		DY2O3 (PPM)		NB2O5 (PPM)		MO (PPM)
2012-REE-051		17.6		351		333.4		1.944		0.032		4640.036		9441.023		1050.764		3537.553		430.256		91.846		176.480		13.614		38.032		1053.150		152.371
including
		17.6		108.7		91.1		2.950		0.048		7090.736		14299.442		1630.517		5312.676		663.223		140.669		268.895		20.087		51.905		1137.913		99.032
		108.7		261		152.3		1.985		0.031		4657.211		9720.108		1065.856		3646.668		436.143		90.769		168.858		12.469		33.878		798.630		225.019
		261		351		90		0.866		0.018		2159.415		4096.458		444.721		1572.357		187.034		44.898		97.340		9.134		31.395		1411.743		79.161
2012-REE-052		16.5		900		883.5		1.639		0.027		4194.159		7781.310		844.435		2926.950		341.657		73.633		146.228		12.634		40.335		1355.005		175.477
including
		16.5		291		274.5		1.185		0.019		3182.502		5593.808		596.862		2031.509		236.162		50.227		101.294		8.998		30.556		2311.790		80.366
		291		900		609		1.844		0.031		4653.105		8773.689		956.749		3333.175		389.516		84.252		166.612		14.284		44.771		920.951		218.624
2012-REE-053		28		453		425		1.501		0.024		4055.025		7259.172		744.859		2414.246		265.261		60.888		128.733		12.781		42.528		1188.726		72.090
including
		28		285		257		1.658		0.029		4381.506		7997.847		831.458		2742.453		309.142		70.660		151.098		15.290		51.946		1146.842		80.818
		285		453		168		1.254		0.018		3541.984		6098.396		608.774		1898.493		196.306		45.531		93.588		8.838		27.729		1254.545		58.375
2012-REE-054		52		900		848		0.539		0.014		1221.536		2516.444		290.444		1063.248		145.501		33.531		71.697		6.704		23.497		1981.693		61.646
2012-REE-055		57		273		216		1.747		0.029		3624.357		8269.401		1020.290		3818.925		436.787		86.008		156.708		12.997		35.706		932.960		271.736
including
		57		204		147		1.900		0.032		3941.474		9009.774		1093.889		4135.653		480.884		95.044		172.963		14.658		40.614		877.817		287.959
		204		273		69		1.422		0.022		2948.759		6692.084		863.491		3144.157		342.841		66.757		122.077		9.458		25.249		1050.441		237.174
2012-REE-056		43.5		549.6		506.1		2.187		0.032		4611.964		10409.236		1282.806		4732.967		491.539		97.457		174.330		13.683		37.415		839.516		259.782
including
		43.5		519		475.5		2.242		0.033		4698.861		10660.187		1319.753		4885.313		509.069		101.007		180.745		14.165		38.483		765.796		267.819
		519		549.6		30.6		1.297		0.014		3221.607		6394.019		691.6579		2295.437		211.0492		40.64321		71.69281		5.985245		20.31406		2019.043		131.2
2012-REE-057		41.6		643.4		601.8		0.643		0.018		1506.955		2973.718		339.740		1233.823		171.645		41.267		90.823		9.031		34.652		2052.576		40.401
2012-REE-058		54		351		297		0.966		0.024		1948.914		4478.858		563.508		2139.026		261.260		58.672		127.629		12.189		46.435		797.861		106.490
including
		54		149		95		1.319		0.032		2707.639		6197.903		753.758		2862.736		324.329		73.528		162.015		15.862		64.163		817.858		49.156
		149		351		202		0.800		0.021		1591.867		3669.897		473.979		1798.456		231.581		51.681		111.448		10.461		38.093		788.451		133.471


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		50
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report


HOLE #	From (m)		To (m)		Lenght (m)		TREO (%)		HREO (%)		LA2O3 (PPM)		CE2O3 (PPM)		PR2O3 (PPM)		ND2O3 (PPM)		SM2O3 (PPM)		EU2O3 (PPM)		GD2O3 (PPM)		TB2O3 (PPM)		DY2O3 (PPM)		NB2O5 (PPM)		MO (PPM)
2012-REE-059		20.7		892.6		871.9		0.667		0.019		1555.905		3061.439		357.846		1295.638		185.696		44.471		99.235		9.554		34.113		2327.264		46.334
including
		20.7		567		546.3		0.576		0.018		1351.238		2641.873		307.336		1093.862		164.173		41.497		94.483		9.433		35.254		2492.907		46.424
		567		892.6		325.6		0.819		0.020		1901.398		3769.696		443.110		1636.250		222.028		49.493		107.257		9.757		32.188		2047.645		46.183
2012-REE-060		30.8		500		469.2		1.758		0.032		4408.003		8349.976		928.011		3203.072		355.249		79.992		169.717		15.839		51.668		989.617		220.371
including
		30.8		459		428.2		1.840		0.033		4610.777		8735.489		970.718		3356.924		372.115		83.674		177.201		16.598		53.941		966.226		234.648
		459		500		41		0.913		0.017		2307.850		4357.162		485.682		1609.606		180.568		41.851		92.209		7.975		28.118		1231.886		72.500
2012-REE-061		54.7		1191		1136.3		1.795		0.029		4701.625		8556.768		932.832		3124.469		320.573		69.397		153.728		15.423		48.419		1724.974		121.326
including
		54.7		342		287.3		1.088		0.034		2688.673		4920.464		558.857		2055.235		272.329		67.518		168.306		19.852		81.995		1380.574		54.979
		342		855		513		2.728		0.033		7253.737		13176.426		1414.928		4650.469		432.966		88.972		186.094		16.757		40.810		1754.331		152.198
		855		1191		336		0.989		0.017		2563.846		4680.806		523.666		1731.871		192.048		41.462		92.492		9.642		31.330		1973.723		131.202


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		51
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 11. SAMPLE PREPARATION, ANALYSES AND SECURITY

11.1 Sampling Method and Approach

For the exploration purpose, sampling for rare earth elements mineralization is limited to diamond drill core. The complete core logging and core sampling method are described below. Detailed description of the drill core is carried out by experienced and qualified personnel under the supervision of Louis Grenier and Jean-Francois Tremblay, members in good standing of the Ordre des Géologues du Québec.

11.1.1 CORE LOGGING

The core was described by the IOS geologist using the mine geological facies nomenclature, which is based on Soquem modified facies definition (C1, C2, C3, etc.). Description includes the alteration types, the major structures appearance, a visual quantification of the key minerals abundance (Lanthanides, apatite, etc…) and the others minerals associated the mineralization (magnetite, hematite, chlorite-biotite, pyrite, ankerite, barite, fluorite and sphalerite). Rock Quality Designation (RQD) is systematically measured. All the core boxes are photographed and additional detail photos are taken at a smaller scale when necessary. Since the core is slightly radioactive, a BGO-SPEC SUPER RS-230 device from Radiation Solutions Inc. was used to measure the core radiometry. The radiometric readings are giving in Gy/hr and µSv / hr.

Following the 2012 P.-J. Lafleur recommendation, the core was sampled on a nominal 3 metres interval (Figure 18). To respect the geological setting, the samples can be shorter or longer. The logger records the sampling intervals (from, to) in the log. A rock code based on the lithology and mineralogy is assigned to each interval. This rock code has an influence in the resource estimation.

Finally, the hole number, collar coordinates, azimuth, dip, final depth, down-hole survey data, facies description, radiometry core measures and assays (once they have been received) are incorporated, by the geological mine staff, on the computer log using Gemcom Logger and LabLogger softwares. The geological sections are then published using Gems software from Gemcom for the geological interpretation and the grade visualization.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		52
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 18: Sample lenght distribution, REE project.

LOGO

11.1.2 CORE SAMPLING

Following the logging procedure described previously, the whole core is sampled based on the intervals identified by the geologist. Core is broken into manageable lengths and cut in half with a diamond blade equipped rock saw. One half is removed from the box and bagged with a serial tag number. The other half is puzzle back into the box with the corresponding analytical tag placed at the beginning of each interval. Core boxes are systematically piled and stored for further needs. Samples bags are shipped in batches (metallic or plastic pails) to IOS warehouse, located at Laterrière (Chicoutimi area, Québec), before shipping to SGS laboratory where the samples are prepared and analyzed.

IOS is a geological service provider independent from IAMGOLD. Samples were prepared by IOS and shipped expeditiously. The quality of their professional services is very high, particularly on issues of sampling and assaying.

It is important to note that several blanks, standard and duplicates samples from IAMGOLD are inserted alternatively every 10 samples (30 metres) approximately. The laboratories also use blanks, standard and duplicates samples of their own to verify their work. The blanks should return no significant REE value within one standard deviation. The standard sample should return their certified REE values within one standard deviation. The duplicates should return the same value as the original sample within a reasonable range of variation. This QA/QC procedure was applies only to the data produced in 2011 and 2012. The details of the QA/QC of historical data (1968 to 1985) are not the same and not entirely documented.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		53
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

11.1.2.1 Blank sample

IAMGOLD is using blanks to check the laboratory. The blank is not a certified commercial blank sample. It is coarse material prepared by IOS coming from a quartz vein near Lac St-Jean. It does carry some very low TREE values (119 ppm) as would be the background value of most rocks. The laboratories should return the “standard blank sample” measured low value grade within the range of measured standard deviation over multiple assays or values below detection limits for these blank samples.

Blanks are not like the certified commercial graded samples designed to test the final assay reading instrument. Those standard samples are delivered as fine powder to the laboratory. The blanks are designed to make sure the sample preparation (crushing, splitting and pulverizing) equipment are clean. Therefore, coarse material is sent to the laboratory in larger quantity (2 Kg) in the usual sample bag. It should have as little REE as possible and is the case. If the blanks return much higher values than its measured grade, it means that the sample preparation facility needs to improve its cleaning procedure. SGS laboratory have been informed of anomalies when they were detected and they applied solutions promptly. The results of using a blank sample in this fashion will inevitably produce results that are more variable than with the certified standard samples. See section 16 for blank results.

11.1.2.2 Standard

Three different commercial certified standard samples were used alternately:

1.	Orea S 101a (low grade),

2.	Orea S 146 (medium grade) from Ore Research & Exploration PTY Ltd. and

3.	GRE-02 (high grade) from Geostat PTY Ltd.

At the beginning of each hole, a low-grade standard, a high grade standard and a blank were inserted (table 8).

11.1.2.3 Check sampling (Core Duplicates)

IAMGOLD took 286 valid duplicate samples using split core to test repeatability of results. The laboratories duplicates would be made from crushed or pulverized rock from the split core.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		54
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Laboratory duplicates are made of smaller portions that are more homogeneous. The results were good. Below are showed the scatter plots of the four principal REE elements

Table 8: Blank and standard samples values (ppm).


STANDARDS	Ce		Dy		Er		Eu		Gd		Ho		La		Lu		Nd		Pr		Sm		Tb		Tm		Yb		Y		U		Th		*TREE*
Blanks		56		0.3		0.1		0.5		2.0		0.2		29		< 0.05		21		6.3		2.6		0.1		< 0.05		< 0.1		1						*119*
OREAS 101a		1651		38		23		9.3		54		6.9		897		3.1		475		155		52		7.4		3.4		20		198		482		42		*3,394*
OREAS 146		5771		272		108		154		428		45		3068		7.2		2758		656		549		57		12		65		1064		3.4		1119		*13,951*
GRE-02		19308		33		24		167		351		3.7		10449		0.8		8416		2234		866		27		0.7		5.7		69		0.0		0.0		*41,886*

11.1.2.4 Check sampling (Core Duplicates)

IAMGOLD took 286 valid duplicate samples using split core to test repeatability of results. The laboratories duplicates would be made from crushed or pulverized rock from the split core. Laboratory duplicates are made of smaller portions that are more homogeneous. The results were good. Below are showed the scatter plots of the four principal REE elements (Figure 19).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		55
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 19: Core duplicate QA / QC report, REE project 2012.

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		56
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		57
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

11.2 SAMPLE PREPARATION

Samples were sent to SGS Minerals Services (“SGS”) of Lakefield in Ontario, where all the samples were prepared (crushed, ground, dried) and analyzed. A summary of the sample preparation is following but the detailed SGS analysis and preparation techniques can be consulted on their website (www.sgs.com).

As a routine practice with core, the entire sample is crushed to a nominal minus 10 mesh (2 mm), mechanically split via a riffle splitter in order to divide the sample into a 250 gr sub-sample for analysis and the remainder is stored as a reject. Samples are pulverized to 85% passing 75 micron (200 mesh) or otherwise specified by client. SGS used their own sample preparation control for more accuracy (Table 9).

Table 9: Internal quality control for sample preparation by SGS Ontario.


Crushing Parametres	Frequency	Quality Control Requirement
Prep. Blank	At the start of batch	To Clean Crusher
Prep. Replicates	every 50 samples	75% passing 10 mesh (2mm)
Passing Checks	Every 50 samples	75% passing 10 mesh (2mm)

Regarding samples analysis, SGS laboratory used the following methods:

•

ICM90A, for 55 elements, by sodium peroxide fusion and a combination of Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), and Inductively Coupled Plasma Mass Spectrometry (ICP-MS).

•

IMS91B by sodium peroxide fusion / ICP-MS, for lanthanides surplus upper limit.

11.3 ANALYSIS

11.3.1 ICM90A

Crushed and pulverized rocks are fused by Sodium peroxide in graphite crucibles and dissolved using diluted HNO3. During digestion the sample is split into 2 and half is given to ICP-OES and the other half is given to ICP¬MS. The digested sample solution is analyzed by ICP-OES and ICP-MS. Samples are analyzed against known calibration materials to provide quantitative analysis of the original sample.

The data results fed to the SGS Laboratory Information Management System (SLIM) with secure audit trait are exported online via computer. This method has been fully validated for the range of samples typically analyzed (Table 10). Method validation includes the use of certified reference materials, replicates and blanks to calculate accuracy, precision, linearity, range, detection limits, and limit of quantification, specificity and measurement uncertainty.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		58
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 10: Elements analyzed by ICM 90A.


Element	Reporting Limit (ppm)			Upper Limit			Element	Reporting Limit (ppm)			Upper Limit			Element	Reporting Limit (ppm)			Upper limit			Element	Reporting Limit (ppm)			Upper Limit
Ag		1.00			0.01	%	Er		0.05			0.10	%	Mn		10			10	%	Tb		0.05			0.10	%
Al		0.01	(%)		25	%	Eu		0.05			0.10	%	Mo		2.00			1.0	%	Th		0.10			0.10	%
As		5.00			10	%	Fe		0.01	(%)		30	%	Nb		1.00			1.0	%	Ti		0.01	(%)		25	%
Ba		0.50			1.0	%	Ga		1.00			0.10	%	Nd		0.10			1.0	%	TI		0.50			0.10	%
Be		5.00			0.25	%	Gd		0.05			0.10	%	Ni		5.00			1.0	%	Tm		0.05			0.10	%
Bi		0.10			0.10	%	Ge		1.00			0.10	%	P		0.01	(%)		25	%	Ta		0.50			1.0	%
Ca		0.01	(%)		35	%	Hf		1.00			1.0	%	Pb		5.00			1.0	%	U		0.05			0.1	%
Cd		0.20			1.0	%	Ho		0.05			0.10	%	Pr		0.05			0.1	%	V		5.00			1.0	%
Ce		0.10			1.0	%	In		0.20			0.10	%	Rb		0.20			1.0	%	W		1.00			1.0	%
Co		0.50			1.0	%	K		0.01	(%)		25	%	Sb		0.50			1.0	%	Y		0.50			0.1	%
Cr		10			10	%	La		0.10			1.0	%	Sc		5.00			5.0	%	Yb		0.10			0.1	%
Cs		0.10			1.0	%	Li		10			5.0	%	Sm		0.10			0.1	%	Zn		5.00			1.0	%
Cu		5.00			1.0	%	Lu		0.05			0.10	%	Sn		1.00			1.0	%	Zr		0.50			1.0	%
Dy		0.05			0.1	%	Mg		0.01	(%)		30	%	Sr		0.10			1.0	%

11.3.2 ICPMS

ICPMS diluted samples to be analyzed on Elan 9000 for 90A samples and Nexion for 91B packages.

Working Calibration solutions and 2^nd source calibration check solution was prepared for each analysis run. Re-calibration was done before the analysis of each tray. Additional fusion QC was analyzed every other tray in addition to the QC on each tray.

REE interference corrections were evaluated and corrected.

11.3.3 ICP/OES

Samples are analyzed with a minimum of 10 certified reference materials for the required analyses, all prepared by sodium peroxide fusion. Every 10^th sample is prepared and analyzed in duplicate; a blank is prepared every 30 samples and analyzed. Samples are analyzed using a Varian 735ES ICP or a Thermo 6500 ICAP and the method of internal standardization.

For High concentration of REE, the IMS91B analysis technic was used (Table 11).

Crushed and pulverized rock, samples (0.20 gr) are fused by Sodium peroxide in glassy carbon crucibles in a muffle furnace and dissolved using diluted HNO3. The fused solution sample is aspirated into the Inductively Coupled Plasma Dynamic Reaction Cell Mass Spectrometre (ICP-DRC-MS). Samples are analyzed against known calibration materials to provide quantitative analysis of the original sample.

The results are exported via computer, on line, data fed to the SGS Laboratory Information Management System (SLIM) with secure audit trail.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		59
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 11: Reporting limits for REE by IMS91B analysis technic.


Element	Reporting Limits (mg/kg)		Element	Reporting Limit (mg/kg)
Ce		50	Pr		10
Dy		1.0	Sm		10
Er		0.5	Tb		1.0
Eu		1.0	Th		5.0
Gd		5.0	Tm		0.10
Ho		0.10	U		1.0
La		50	Y		5.0
Lu		0.20	Yb		1.0
Nd		50

Instrument calibration is performed for each batch or work order and calibration checks are analyzed within each analytical run. Quality control materials include method blanks, replicates, duplicates and reference materials and are randomly inserted with the frequency set according to method protocols at -14%.

Quality assurance measures of precision and accuracy are verified statistically using SLIM control charts with set criteria for data acceptance. Data that fails is subject to investigation and repeated as necessary.

11.4 SAMPLE SECURITY

Core samples collected at the drill site are stored in closed wooden core boxes and are delivered to the core-shack facility by the contractor where it is then taken by mine geology personnel. All core logging and sampling takes place in the core-shack. The site is fenced, monitored by close-circuit video cameras and has a security guard posted at all times at the entrance. After the logging and the splitting process, the samples are bagged and packed into plastic or metal pails for shipping. When a hole is completed, IOS Geoservices personnel collect the pails and bring them to their warehouse. The radiometry of each pail is verified to respect the radiometric transportation rules and the shipment is completed. IOS is an independent contractor specialized in the sample management. They follow rigorous methods verified and approved by IAMGOLD-Niobec geological staff. Finally, a carrier transports the sample to SGS facility where they are handled by the laboratory personnel.

Item 12. Data Verification

12.1 Verification with laboratory certificates

IAMGOLD-Niobec geological team was receiving electronic Laboratory certificates during the entire program. They were verified and numerically archived on the informatics mine system. SGS also kept a certificate version on their SLIM program. They are available at all time.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		60
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

In 2012, the Lablogger software from Gems was used to import the certificate into the Gems data base. The data manipulations were restricted and the probability of error decreased. By referring to only one laboratory, SGS, the certificate presentation were standardized and constant all year long.

Lablogger is also used for the QA / QC program.

12.2 QA / QC program

IAMGOLD carried out a QA/QC program with blanks samples, 3 certified REE standards samples (low, medium and high grade) and core duplicates (discussed in Item 14). This is without mentioning the laboratories own check assays and duplicates. Small anomalies were found through the year and were immediately signaled and corrected by SGS. Re-assayed was realised when necessary. A large number of elements, 15 for REE plus numerous associated elements (Ce, Dy, Er, Eu, Gd, Ho, La, Lu, Nd, Pr, Sm, Tb, Tm, Yb, Y, Sc, Nb, U, Th,…), were involved in the QA / QC program but only the four majors REE elements are presented as director line.

12.2.1 Blank sample results and interpretation

The blank sample, which is not a certified commercial blank, is not truly blank. It has a very low average grade of 119 ppm TREE (Table 8) and a relatively high coefficient of variation. The blanks were used 331 times to check the SGS laboratory samples preparation protocol. The TREE averaged valued is 179 ppm and varied from 107 ppm to 334 ppm during the year (Table 12). The coefficient of variation seems to increase with the volume of samples processed in a month. However the average TREE value can reach almost twice the value of the original “blank” sample, those values still very low and near the TREE background limit. Looking at the lanthanum values (Figure 20 and Table 13), the highest level of contamination noticed is 0.06% La (600 ppm). Even if a correction measures was taken in this case, the 0.06% La contamination is very low compared to the 0.4% La mean value for all 2012 samples.

The outliers limits were placed very low for all REEs. In Table 13, the cerium had an all year bad performance with 27% of the sample being above the 100 ppm Ce imposed limit. Once again, even the highest level of Ce contamination (near 1200ppm) is considered marginal compared to the Ce high average value returned in the REE zone. The high variability of the blank samples was not considered problematic for the data base validity.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		61
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 12: QA / QC summary, REE exploration program.


	March				April				May				June				July				August				September				October				November				December				YTD
		Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.			Sent	Rec.
Samples		899	13			968	357			1793	1027			818	882			1362	1339			536	1770			1099	761			1292	959			83	1470			12	216			8862	8794
QA / QC
		Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check			Assays	Check
		13	Ratio			357	Ratio			1027	Ratio			882	Ratio			1339	Ratio			1770	Ratio			761	Ratio			959	Ratio			1470	Ratio			216	Ratio			8794	Ratio
SRM¹
GRE-02		0	0.00	%		6	1.68	%		16	1.56	%		14	1.59	%		15	1.12	%		26	1.47	%		12	1.58	%		14	1.46	%		16	1.09	%		0	0.00	%		119	1.35	%
Oreas 146		0	0.00	%		5	1.40	%		18	1.75	%		8	0.91	%		15	1.12	%		25	1.41	%		8	1.05	%		7	0.73	%		27	1.84	%		5	2.31	%		118	1.34	%
Oreas 101a		0	0.00	%		3	0.84	%		6	0.58	%		9	1.02	%		15	1.12	%		24	1.36	%		12	1.58	%		15	1.56	%		17	1.16	%		2	0.93	%		103	1.17	%

Total SRM		0	0.00	%		14	3.92	%		40	3.89	%		31	3.51	%		45	3.36	%		75	4.24	%		32	4.20	%		36	3.75	%		60	4.08	%		7	3.24	%		340	3.87	%

Blanks²		0	0.00	%		13	3.64	%		41	3.99	%		28	3.17	%		44	3.29	%		76	4.29	%		30	3.94	%		37	3.86	%		55	3.74	%		7	3.24	%		331	3.76	%
Core duplicate³		0	0.00	%		12	3.36	%		34	3.31	%		27	3.06	%		39	2.91	%		61	3.45	%		26	3.42	%		32	3.34	%		49	3.33	%		6	2.78	%		286	3.25	%

Total QA / QC		0	0.00	%		39	10.92	%		115	11.20	%		86	9.75	%		128	9.56	%		212	11.98	%		88	11.56	%		105	10.95	%		164	11.16	%		20	9.26	%		957	10.88	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		62
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 20: Blank QA / QC report, REE project 2012.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		63
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 13: Summary of Blanks results, REE project 2012.

Blank


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
	Warning level		100			100			20			100			10			1			5			1			1			0.1			0.5			0.1			1			0.2			5
SGS

April	Number of sample		13			13			13			13			13			13			13			13			13			13			13			13			13			13			13
	Average value		25.000			45.769			5.000			25.000			5.000			0.500			2.500			0.500			0.500			0.050			0.250			0.050			0.500			0.100			2.500
	1 STD		0.000			37.961			0.000			0.000			0.000			0.000			0.000			0.000			0.000			0.000			0.000			0.000			0.000			0.000			0.000
	Coeff. of variation		0.0	%		82.9	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%
	Above warning level		0			1			0			0			0			0			0			0			0			0			0			0			0			0			0
	%AWL		0.0	%		7.7	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

May	Number of sample		41			41			41			41			41			41			41			41			41			41			41			41			41			41			41
	Average value		39.024			66.951			6.463			28.293			5.000			0.573			2.500			0.500			0.610			0.072			0.273			0.056			0.537			0.110			2.500
	1 STD		26.745			56.190			4.506			11.864			0.000			0.327			0.000			0.000			0.395			0.072			0.148			0.039			0.234			0.044			0.000
	Coeff. of variation		68.5	%		83.9	%		69.7	%		41.9	%		0.0	%		57.1	%		0.0	%		0.0	%		64.9	%		100.8	%		54.3	%		69.6	%		43.7	%		39.7	%		0.0	%
	Above warning level		1			11			0			0			0			0			0			0			0			2			1			1			0			0			0
	%AWL		2.4	%		26.8	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		4.9	%		2.4	%		2.4	%		0.0	%		0.0	%		0.0	%

June	Number of sample		28			28			28			28			28			28			28			28			28			28			28			28			28			28			28
	Average value		12.463			21.635			7.048			10.541			6.571			5.998			6.214			5.929			6.011			6.089			6.017			5.990			5.979			5.904			6.214
	1 STD		15.991			23.827			12.484			14.263			12.647			12.804			12.727			12.838			12.798			12.770			12.796			12.810			12.813			12.849			12.727
	Coeff. of variation		128.3	%		110.1	%		177.1	%		135.3	%		192.5	%		213.5	%		204.8	%		216.5	%		212.9	%		209.7	%		212.7	%		213.8	%		214.3	%		217.6	%		204.8	%
	Above warning level		3			11			2			1			0			0			0			0			0			2			0			1			0			0			0
	%AWL		10.7	%		39.3	%		7.1	%		3.6	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		7.1	%		0.0	%		3.6	%		0.0	%		0.0	%		0.0	%

July	Number of sample		44			44			44			44			44			44			44			44			44			44			44			44			44			44			44
	Average value		59.205			104.545			10.227			39.886			5.682			0.795			2.773			0.500			0.591			0.057			0.250			0.050			0.500			0.105			2.500
	1 STD		56.732			102.184			11.859			36.047			3.161			0.831			1.269			0.000			0.435			0.032			0.000			0.000			0.000			0.030			0.000
	Coeff. of variation		95.8	%		97.7	%		116.0	%		90.4	%		55.6	%		104.4	%		45.8	%		0.0	%		73.6	%		55.6	%		0.0	%		0.0	%		0.0	%		28.8	%		0.0	%
	Above warning level		5			18			3			2			0			2			0			0			1			0			0			0			0			0			0
	%AWL		11.4	%		40.9	%		6.8	%		4.5	%		0.0	%		4.5	%		0.0	%		0.0	%		2.3	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

August	Number of sample		76			76			76			76			76			76			76			76			76			76			76			76			76			76			76
	Average value		48.224			89.868			10.000			36.974			5.329			0.750			2.546			0.500			0.546			0.061			0.255			0.050			0.500			0.100			2.559
	1 STD		41.647			80.693			8.406			25.911			1.886			0.520			0.401			0.000			0.247			0.039			0.040			0.000			0.000			0.000			0.516
	Coeff. of variation		86.4	%		89.8	%		84.1	%		70.1	%		35.4	%		69.3	%		15.8	%		0.0	%		45.3	%		63.4	%		15.8	%		0.0	%		0.0	%		0.0	%		20.2	%
	Above warning level		5			25			5			2			0			1			0			0			0			1			0			0			0			0			0
	%AWL		6.6	%		32.9	%		6.6	%		2.6	%		0.0	%		1.3	%		0.0	%		0.0	%		0.0	%		1.3	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		64
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Blank


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
September	Number of sample		30			30			30			30			30			30			30			30			30			30			30			30			30			30			30
	Average value		80.500			145.500			17.833			69.000			9.333			1.600			4.100			0.567			0.917			0.105			0.318			0.055			0.500			0.100			3.317
	1 STD		134.833			263.796			29.410			108.170			12.847			2.752			4.956			0.286			1.287			0.170			0.272			0.027			0.000			0.000			3.133
	Coeff. of variation		167.5	%		181.3	%		164.9	%		156.8	%		137.7	%		172.0	%		120.9	%		50.4	%		140.4	%		162.3	%		85.5	%		49.8	%		0.0	%		0.0	%		94.5	%
	Above warning level		4			9			6			6			2			4			2			0			2			3			1			0			0			0			1
	%AWL		13.3	%		30.0	%		20.0	%		20.0	%		6.7	%		13.3	%		6.7	%		0.0	%		6.7	%		10.0	%		3.3	%		0.0	%		0.0	%		0.0	%		3.3	%

October	Number of sample		37			37			37			37			37			37			37			37			37			37			37			37			37			37			37
	Average value		45.270			77.027			9.054			32.297			5.405			0.730			2.770			0.500			0.608			0.069			0.281			0.054			0.541			0.103			2.905
	1 STD		53.515			100.654			9.849			27.147			2.466			0.662			1.200			0.000			0.473			0.084			0.189			0.025			0.247			0.016			1.859
	Coeff. of variation		118.2	%		130.7	%		108.8	%		84.1	%		45.6	%		90.8	%		43.3	%		0.0	%		77.8	%		121.3	%		67.3	%		45.6	%		45.6	%		16.0	%		64.0	%
	Above warning level		1			8			1			1			0			1			0			0			1			2			1			0			0			0			1
	%AWL		2.7	%		21.6	%		2.7	%		2.7	%		0.0	%		2.7	%		0.0	%		0.0	%		2.7	%		5.4	%		2.7	%		0.0	%		0.0	%		0.0	%		2.7	%

November	Number of sample		55			55			55			55			55			55			55			55			55			55			55			55			55			55			55
	Average value		23.006			37.985			11.413			18.779			9.443			8.561			8.705			8.111			8.365			8.397			8.198			8.118			8.125			8.058			8.619
	1 STD		29.519			51.162			17.039			24.679			17.204			17.413			17.369			17.605			17.492			17.485			17.566			17.603			17.599			17.629			17.397
	Coeff. of variation		128.3	%		134.7	%		149.3	%		131.4	%		182.2	%		203.4	%		199.5	%		217.0	%		209.1	%		208.2	%		214.3	%		216.8	%		216.6	%		218.8	%		201.8	%
	Above warning level		2			6			1			1			0			1			0			0			0			0			0			0			0			0			0
	%AWL		3.6	%		10.9	%		1.8	%		1.8	%		0.0	%		1.8	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

December	Number of sample		7			7			7			7			7			7			7			7			7			7			7			7			7			7			7
	Average value		10.4741			17.2672			6.3272			8.7984			5.9115			6.0043			5.8450			5.8145			5.8246			5.8274			5.8178			5.8148			5.8150			5.8125			5.8392
	1 STD		12.6258			21.7178			6.8208			10.4781			6.7496			6.5471			6.7152			6.7319			6.7193			6.7204			6.7273			6.7318			6.7311			6.7349			6.7150
	Coeff. of variation		120.5	%		125.8	%		107.8	%		119.1	%		114.2	%		109.0	%		114.9	%		115.8	%		115.4	%		115.3	%		115.6	%		115.8	%		115.8	%		115.9	%		115.0	%
	Above warning level		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	%AWL		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

YTD	Number of sample		331			331			331			331			331			331			331			331			331			331			331			331			331			331			331
	Average value		38.130			67.394			9.263			29.952			6.408			2.835			4.217			2.547			2.664			2.303			2.407			2.249			2.555			2.266			4.106
	1 STD		41.290			82.021			11.153			28.729			6.329			4.651			4.960			4.162			4.428			4.152			4.193			4.137			4.180			4.145			4.705
	Coeff. of variation		108.3	%		121.7	%		120.4	%		95.9	%		98.8	%		164.1	%		117.6	%		163.4	%		166.2	%		180.3	%		174.2	%		184.0	%		163.6	%		182.9	%		114.6	%
	Above warning level		21			89			18			13			2			9			2			0			4			10			3			2			0			0			2
	%AWL		6.3	%		26.9	%		5.4	%		3.9	%		0.6	%		2.7	%		0.6	%		0.0	%		1.2	%		3.0	%		0.9	%		0.6	%		0.0	%		0.0	%		0.6	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		65
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

12.2.2 OREAS 101a results and interpretation

The Oreas 101a was used to verified the REE low grade values accuracy. It is a certified standard provide by an external laboratory. The average value of 3,394 ppm TREE is detailed in Table 8. During 2012, the Oreas 101a was systematically sent at the beginning of each batch (each hole) to test the instruments calibration and after inserted randomly with the others standard to validate the accuracy of the analysis.

The Oreas 101a returned an excellent 2012 QA / QC performance (Figure 21). Two isolated certificate needed more supervision and interpretation. In those cases, on the same certificate the other standard and the blank performance were evaluated. Overall, 103 Oreas 101a standards were analyzed and the percentage of outliers reported is very low. The worst performance is coming from the yttrium element. The yttrium is excluded of the total rare earth element contain and it was analyzed for the geochemical knowledge of the REE zone and does not influence the resource estimation.

The 2012 average value of each element is generally under the certified average value (Table 14) which means a probable under evaluation of the REE contain on the rare low grading assays.

Based on the previous observations, the REE lower grade samples were controlled and their data are validated for the purpose of this 43-101 report.

12.2.3 OREAS 146 results and interpretation

The Oreas 146 was used to verify the medium grade REE values accuracy. This certified standard is provided by an external laboratory and the average value of 13,951 ppm TREE is detailed in Table 8. During the 2012 drilling program, the Oreas 146 was inserted randomly with the others standard to validate the accuracy of the analysis.

The Oreas 146 returned an excellent QA / QC performance during all year long (Figure 22). No assays returned values over or under twice the standard deviation limits for the main REE elements. Only the lutetium and the yttrium have shown outlier’s values. For both elements, it was judge has isolated cases and not enough significant to altered the data base quality.

Better QA / QC statistic cannot be hoped for a standard. The year average value of each element is almost the same has the certified average value (Table 15) and the coefficient of variation is very low. The Oreas 146 confirmed the laboratory expertise and increased the confidence level of the data base, especially for the medium grade assays.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		66
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 21: OREAS 101a QA / QC report, REE project 2012.

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		67
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		68
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 14: Summary of the OREAS 101a QA / QC results, REE project 2012.

Oreas-101a


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
	Certified Value		816			1396			134			403			48.8			8.06			43.4			5.92			33.3			6.46			19.5			2.9			17.5			2.66			183
	Tolerance		62			131			12			40			3.8			0.72			5.9			0.71			2.3			0.52			1.8			0.22			1.7			0.19			8
	Coefficient of variation		7.60	%		9.38	%		8.96	%		9.93	%		7.79	%		8.93	%		13.59	%		11.99	%		6.91	%		8.05	%		9.23	%		7.59	%		9.71	%		7.14	%		4.37	%
SGS

April	Number of sample		3			3			3			3			3			3			3			3			3			3			3			3			3			3			3
	Average value		823.3			1426.7			130.0			406.7			50.0			8.0			39.7			6.0			33.3			6.8			19.6			2.9			19.0			2.7			173.3
	1 STD		5.8			15.3			0.0			5.8			0.0			0.0			0.6			0.0			0.6			0.1			0.2			0.1			0.0			0.1			2.1
	Coefficient of variation		0.7	%		1.1	%		0.0	%		1.4	%		0.0	%		0.0	%		1.5	%		0.0	%		1.7	%		0.8	%		1.1	%		2.0	%		0.0	%		2.1	%		1.2	%
	% Difference on average		0.9	%		2.2	%		3.0	%		0.9	%		2.5	%		0.7	%		8.6	%		1.4	%		0.1	%		5.8	%		0.7	%		1.1	%		8.6	%		2.8	%		5.3	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

May	Number of sample		6			6			6			6			6			6			6			6			6			6			6			6			6			6			6
	Average value		826.7			1401.7			133.3			406.7			51.7			8.2			39.0			6.0			33.0			6.7			20.3			2.9			18.8			2.7			179.3
	1 STD		32.0			42.6			5.2			15.1			4.1			0.4			2.2			0.0			1.3			0.1			1.1			0.1			0.4			0.1			3.4
	Coefficient of variation		3.9	%		3.0	%		3.9	%		3.7	%		7.9	%		5.0	%		5.6	%		0.0	%		3.8	%		1.8	%		5.3	%		2.8	%		2.2	%		2.8	%		1.9	%
	% Difference on average		1.3	%		0.4	%		0.5	%		0.9	%		5.9	%		1.3	%		10.1	%		1.4	%		0.9	%		3.2	%		4.1	%		1.1	%		7.6	%		2.1	%		2.0	%
	Nb. Outliers		0			0			0			0			1			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		16.7	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

June	Number of sample		9			9			9			9			9			9			9			9			9			9			9			9			9			9			9
	Average value		109.2			182.4			19.2			54.6			9.0			3.0			7.0			2.6			6.2			2.7			4.6			2.3			4.3			2.2			24.7
	1 STD		290.1			492.9			46.3			142.4			17.5			4.0			13.3			3.7			11.4			3.8			7.2			3.5			6.8			3.5			62.6
	Coefficient of variation		265.6	%		270.2	%		241.0	%		260.8	%		194.8	%		136.6	%		189.4	%		142.3	%		184.3	%		139.7	%		158.2	%		154.3	%		158.6	%		155.9	%		253.0	%
	% Difference on average		86.6	%		86.9	%		85.7	%		86.5	%		81.5	%		63.3	%		83.8	%		55.6	%		81.5	%		57.7	%		76.6	%		22.2	%		75.5	%		16.2	%		86.5	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

July	Number of sample		15			15			15			15			15			15			15			15			15			15			15			15			15			15			15
	Average value		825.3			1385.3			132.0			406.0			50.0			8.0			38.0			5.9			32.5			6.6			19.7			2.9			18.6			2.7			173.5
	1 STD		22.3			38.9			4.1			10.6			0.0			0.0			1.4			0.3			0.9			0.1			0.6			0.1			0.6			0.1			6.7
	Coefficient of variation		2.7	%		2.8	%		3.1	%		2.6	%		0.0	%		0.0	%		3.6	%		4.4	%		2.8	%		1.5	%		3.0	%		3.2	%		3.4	%		2.4	%		3.9	%
	% Difference on average		1.1	%		0.8	%		1.5	%		0.7	%		2.5	%		0.7	%		12.4	%		0.2	%		2.3	%		2.9	%		1.0	%		1.6	%		6.3	%		0.0	%		5.2	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			3
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		20.0	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		69
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Oreas-101a


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
August	Number of sample		24			24			24			24			24			24			24			24			24			24			24			24			24			24			24
	Average value		102.7			171.2			18.6			51.8			8.8			3.5			7.2			3.3			6.5			3.3			4.9			2.9			4.8			2.9			24.0
	1 STD		249.1			421.2			39.6			122.2			15.6			6.3			12.2			6.1			10.8			6.2			7.9			6.1			7.7			6.1			52.7
	Coefficient of variation		242.5	%		246.0	%		212.4	%		236.0	%		177.2	%		178.3	%		168.8	%		187.8	%		166.4	%		184.6	%		159.5	%		207.3	%		160.7	%		209.2	%		219.3	%
	% Difference on average		87.4	%		87.7	%		86.1	%		87.2	%		82.0	%		56.5	%		83.3	%		44.8	%		80.6	%		48.3	%		74.6	%		1.1	%		72.8	%		9.2	%		86.9	%
	Nb. Outliers		1			1			1			1			1			1			0			1			1			1			1			1			1			1			1
	% Outliers		4.2	%		4.2	%		4.2	%		4.2	%		4.2	%		4.2	%		0.0	%		4.2	%		4.2	%		4.2	%		4.2	%		4.2	%		4.2	%		4.2	%		4.2	%

September	Number of sample		12			12			12			12			12			12			12			12			12			12			12			12			12			12			12
	Average value		825.0			1380.8			133.3			401.7			50.0			8.0			37.8			5.8			32.3			6.6			20.0			2.8			18.6			2.6			172.4
	1 STD		27.5			65.6			6.5			14.7			0.0			0.4			1.3			0.4			1.4			0.2			0.8			0.1			0.7			0.1			4.7
	Coefficient of variation		3.3	%		4.7	%		4.9	%		3.7	%		0.0	%		5.3	%		3.3	%		6.7	%		4.2	%		3.3	%		4.1	%		3.2	%		3.6	%		4.5	%		2.7	%
	% Difference on average		1.1	%		1.1	%		0.5	%		0.3	%		2.5	%		0.7	%		12.8	%		1.5	%		3.2	%		2.2	%		2.4	%		2.0	%		6.2	%		2.6	%		5.8	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			2
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		16.7	%

October	Number of sample		15			15			15			15			15			15			15			15			15			15			15			15			15			15			15
	Average value		822.0			1380.7			131.3			400.7			50.0			8.1			37.2			5.7			31.9			6.5			19.7			2.8			18.6			2.6			173.1
	1 STD		31.0			55.7			7.4			16.7			0.0			0.3			1.0			0.5			0.5			0.2			0.4			0.1			0.5			0.1			2.9
	Coefficient of variation		3.8	%		4.0	%		5.7	%		4.2	%		0.0	%		3.2	%		2.7	%		8.6	%		1.4	%		2.3	%		2.1	%		2.2	%		2.7	%		4.0	%		1.7	%
	% Difference on average		0.7	%		1.1	%		2.0	%		0.6	%		2.5	%		0.1	%		14.3	%		4.3	%		4.1	%		0.6	%		0.8	%		1.8	%		6.3	%		0.8	%		5.4	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

November	Number of sample		17			17			17			17			17			17			17			17			17			17			17			17			17			17			17
	Average value		1115.3			1951.8			206.5			728.8			122.9			29.5			95.1			12.6			66.6			12.1			32.0			4.2			24.9			3.3			309.2
	1 STD		638.7			1267.2			165.7			724.3			162.5			47.5			127.3			15.4			76.2			12.1			26.6			2.9			14.4			1.6			306.3
	Coefficient of variation		57.3	%		64.9	%		80.3	%		99.4	%		132.2	%		161.2	%		133.9	%		122.1	%		114.5	%		100.4	%		83.3	%		69.4	%		57.8	%		47.4	%		99.1	%
	% Difference on average		36.7	%		39.8	%		54.1	%		80.8	%		151.9	%		265.6	%		119.0	%		113.6	%		100.0	%		86.7	%		64.1	%		43.4	%		42.2	%		25.8	%		68.9	%
	Nb. Outliers		3			3			3			3			3			3			3			3			3			3			3			3			3			3			5
	% Outliers		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		17.6	%		29.4	%

December	Number of sample		2			2			2			2			2			2			2			2			2			2			2			2			2			2			2
	Average value		870.0			1400.0			130.0			395.0			50.0			8.0			38.0			6.0			31.5			6.7			20.4			3.0			18.5			2.7			172.5
	1 STD		42.4			84.9			0.0			21.2			0.0			0.0			0.0			0.0			0.7			0.1			0.5			0.1			0.7			0.1			4.9
	Coefficient of variation		4.9	%		6.1	%		0.0	%		5.4	%		0.0	%		0.0	%		0.0	%		0.0	%		2.2	%		1.1	%		2.4	%		2.4	%		3.8	%		5.2	%		2.9	%
	% Difference on average		6.6	%		0.3	%		3.0	%		2.0	%		2.5	%		0.7	%		12.4	%		1.4	%		5.4	%		2.9	%		4.4	%		1.7	%		5.7	%		1.5	%		5.7	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		70
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Oreas-101a

REE

YTD

Number of sample

103

Average value

650.5

1091.1

103.5

315.4

39.9

6.8

30.5

5.2

25.9

5.7

16.1

2.8

15.1

2.6

136.6

1 STD

87.5

152.1

13.6

43.6

4.6

1.4

4.0

1.4

3.4

1.3

2.3

1.3

2.2

1.3

17.5

Coefficient of variation

13.5

13.9

13.2

13.8

11.6

20.8

13.1

26.6

13.2

23.3

14.5

44.5

14.4

47.8

12.8

% Difference on average

20.3

21.8

22.8

21.7

18.2

15.2

29.7

12.7

22.2

11.1

17.2

3.1

13.4

0.5

25.3

Nb. Outliers

% Outliers

3.9

4.9

3.9

2.9

3.9

10.7


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		71
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 22: OREAS 146 QA / QC report, REE project 2012.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		72
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 15: Summary of the OREAS 146 QA / QC results, REE exploration project.

Oreas-146


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
	Certified Value		2513			4691			548			2182			441			127			359			47.2			224			36.8			87.7			9.9			53.5			6.3			905
	Tolerance		185			360			36			192			36			9			23			3.4			16			2.7			7			0.8			3.9			0.3			53
	Coefficient of variation		7.36	%		7.67	%		6.57	%		8.80	%		8.16	%		7.09	%		6.41	%		7.20	%		7.14	%		7.34	%		7.98	%		8.08	%		7.29	%		4.76	%		5.86	%
SGS

April	Number of sample		5			5			5			5			5			5			5			5			5			5			5			5			5			5			5
	Average value		2532.0			4768.0			540.0			2236.0			442.0			124.8			368.4			49.8			231.0			37.9			84.6			10.1			54.4			6.8			897.4
	1 STD		71.9			84.1			7.1			31.3			8.4			2.2			7.8			0.8			2.4			0.4			1.8			0.1			1.1			0.2			25.1
	Coefficient of variation		2.8	%		1.8	%		1.3	%		1.4	%		1.9	%		1.7	%		2.1	%		1.7	%		1.1	%		1.0	%		2.1	%		1.5	%		2.1	%		2.4	%		2.8	%
	% Difference on average		0.8	%		1.6	%		1.5	%		2.5	%		0.2	%		1.7	%		2.6	%		5.5	%		3.1	%		3.0	%		3.6	%		2.2	%		1.7	%		7.6	%		0.8	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			1			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		20.0	%		0.0	%

May	Number of sample		18			18			18			18			18			18			18			18			18			18			18			18			18			18			18
	Average value		2553.3			4763.3			553.9			2230.0			448.9			127.4			355.1			47.1			224.6			36.5			85.8			10.0			53.6			6.6			900.1
	1 STD		103.1			156.5			17.5			99.2			14.5			4.8			14.5			1.7			8.3			0.8			2.4			0.3			1.3			0.3			28.1
	Coefficient of variation		4.0	%		3.3	%		3.2	%		4.4	%		3.2	%		3.8	%		4.1	%		3.7	%		3.7	%		2.2	%		2.8	%		2.5	%		2.4	%		4.4	%		3.1	%
	% Difference on average		1.6	%		1.5	%		1.1	%		2.2	%		1.8	%		0.3	%		1.1	%		0.3	%		0.3	%		0.9	%		2.2	%		1.0	%		0.2	%		4.7	%		0.5	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			1			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		5.6	%		0.0	%

June	Number of sample		8			8			8			8			8			8			8			8			8			8			8			8			8			8			8
	Average value		2533.8			4755.0			551.3			2197.5			451.3			126.1			365.8			48.3			222.9			37.4			87.7			10.1			53.6			6.5			897.0
	1 STD		76.0			125.2			18.9			94.4			15.5			3.7			7.3			2.3			5.1			0.8			1.4			0.2			1.2			0.2			13.2
	Coefficient of variation		3.0	%		2.6	%		3.4	%		4.3	%		3.4	%		2.9	%		2.0	%		4.7	%		2.3	%		2.0	%		1.6	%		1.9	%		2.2	%		2.8	%		1.5	%
	% Difference on average		0.8	%		1.4	%		0.6	%		0.7	%		2.3	%		0.7	%		1.9	%		2.2	%		0.5	%		1.6	%		0.0	%		2.0	%		0.2	%		3.8	%		0.9	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

July	Number of sample		15			15			15			15			15			15			15			15			15			15			15			15			15			15			15
	Average value		2555.3			4743.3			562.0			2231.3			454.7			128.4			360.9			48.5			229.1			37.2			86.9			10.1			54.0			6.6			915.2
	1 STD		57.2			99.4			14.2			80.3			15.5			3.9			13.6			1.3			6.0			0.7			2.3			0.3			1.5			0.2			26.8
	Coefficient of variation		2.2	%		2.1	%		2.5	%		3.6	%		3.4	%		3.1	%		3.8	%		2.7	%		2.6	%		1.8	%		2.7	%		2.9	%		2.7	%		2.7	%		2.9	%
	% Difference on average		1.7	%		1.1	%		2.6	%		2.3	%		3.1	%		1.1	%		0.5	%		2.7	%		2.3	%		1.2	%		0.9	%		2.5	%		0.9	%		4.2	%		1.1	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		73
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Oreas-146


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
August	Number of sample		25			25			25			25			25			25			25			25			25			25			25			25			25			25			25
	Average value		2527.6			4687.6			549.6			2214.0			453.6			128.1			363.0			48.4			227.4			36.9			87.2			10.0			53.7			6.5			912.0
	1 STD		76.4			103.0			18.1			71.0			12.9			3.3			9.6			1.0			4.2			0.5			1.8			0.2			1.3			0.2			19.3
	Coefficient of variation		3.0	%		2.2	%		3.3	%		3.2	%		2.8	%		2.6	%		2.6	%		2.0	%		1.8	%		1.5	%		2.1	%		2.3	%		2.4	%		3.1	%		2.1	%
	% Difference on average		0.6	%		0.1	%		0.3	%		1.5	%		2.9	%		0.9	%		1.1	%		2.5	%		1.5	%		0.2	%		0.5	%		1.1	%		0.3	%		3.2	%		0.8	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

September	Number of sample		8			8			8			8			8			8			8			8			8			8			8			8			8			8			8
	Average value		2565.0			4706.3			562.5			2227.5			453.8			129.5			363.6			47.4			219.8			37.0			87.0			10.0			52.9			6.4			898.1
	1 STD		66.3			96.4			20.5			60.9			16.0			3.3			9.7			1.8			5.6			1.2			2.7			0.3			0.6			0.3			18.6
	Coefficient of variation		2.6	%		2.0	%		3.6	%		2.7	%		3.5	%		2.5	%		2.7	%		3.9	%		2.5	%		3.1	%		3.1	%		3.2	%		1.2	%		5.3	%		2.1	%
	% Difference on average		2.1	%		0.3	%		2.6	%		2.1	%		2.9	%		2.0	%		1.3	%		0.4	%		1.9	%		0.5	%		0.8	%		0.5	%		1.2	%		1.4	%		0.8	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

October	Number of sample		7			7			7			7			7			7			7			7			7			7			7			7			7			7			7
	Average value		2518.6			4677.1			542.9			2182.9			452.9			127.1			360.7			47.0			226.0			36.7			86.1			10.1			54.3			6.5			924.3
	1 STD		149.2			152.8			30.9			121.2			21.4			5.6			14.5			2.2			5.8			0.8			3.8			0.3			1.0			0.3			70.9
	Coefficient of variation		5.9	%		3.3	%		5.7	%		5.6	%		4.7	%		4.4	%		4.0	%		4.6	%		2.6	%		2.3	%		4.4	%		2.5	%		1.8	%		4.6	%		7.7	%
	% Difference on average		0.2	%		0.3	%		0.9	%		0.0	%		2.7	%		0.1	%		0.5	%		0.4	%		0.9	%		0.3	%		1.8	%		2.5	%		1.5	%		3.6	%		2.1	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			1
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		14.3	%

November	Number of sample		27			27			27			27			27			27			27			27			27			27			27			27			27			27			27
	Average value		2580.0			4713.0			558.9			2235.6			455.6			128.5			358.3			46.3			222.9			37.0			86.6			10.0			53.5			6.5			907.8
	1 STD		75.8			143.8			15.5			71.2			14.0			3.0			13.7			2.0			4.3			0.7			2.0			0.2			1.4			0.2			23.9
	Coefficient of variation		2.9	%		3.1	%		2.8	%		3.2	%		3.1	%		2.4	%		3.8	%		4.4	%		1.9	%		2.0	%		2.3	%		1.9	%		2.6	%		2.5	%		2.6	%
	% Difference on average		2.7	%		0.5	%		2.0	%		2.5	%		3.3	%		1.2	%		0.2	%		1.8	%		0.5	%		0.6	%		1.3	%		1.4	%		0.0	%		2.7	%		0.3	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

December	Number of sample		5			5			5			5			5			5			5			5			5			5			5			5			5			5			5
	Average value		2592.0			4742.0			556.0			2210.0			456.0			129.2			361.4			48.4			222.0			36.8			87.6			10.1			53.4			6.3			900.8
	1 STD		41.5			131.6			21.9			80.6			8.9			2.5			5.0			0.9			4.8			0.7			0.8			0.2			1.1			0.3			15.4
	Coefficient of variation		1.6	%		2.8	%		3.9	%		3.6	%		2.0	%		1.9	%		1.4	%		1.8	%		2.2	%		1.9	%		1.0	%		1.5	%		2.1	%		5.1	%		1.7	%
	% Difference on average		3.1	%		1.1	%		1.5	%		1.3	%		3.4	%		1.7	%		0.7	%		2.5	%		0.9	%		0.1	%		0.1	%		1.6	%		0.2	%		0.3	%		0.5	%
	Nb. Outliers		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		74
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Oreas-146

REE

YTD

Number of sample

118

Average value

2547.2

4730.3

552.3

2216.1

451.6

127.6

362.4

48.1

225.3

37.0

86.6

10.1

53.7

6.5

905.6

1 STD

80.2

118.6

18.7

79.9

14.1

3.7

10.3

1.5

5.3

0.7

2.1

0.2

1.1

0.2

27.2

Coefficient of variation

3.1

2.5

3.4

3.6

3.1

2.9

2.8

3.1

2.4

2.0

2.5

2.3

2.1

3.8

3.0

% Difference on average

1.4

0.8

1.6

2.4

0.5

0.9

1.9

0.6

0.7

1.2

1.7

0.4

3.6

0.1

Nb. Outliers

% Outliers

0.0

1.7

0.8


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		75
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

12.2.4 GRE 02 results and interpretation

The GRE 02 was used to verify the REE high grade values accuracy. It is a certified standard is provided by an external laboratory and the average value of 41,886 ppm TREE is detailed in Table 8. During 2012, the GRE 02 was sent systematically at the beginning of each batch (each hole) to test the instruments calibration and inserted randomly with the others standard to validate the accuracy of the analysis.

The GRE 02 returned a good QA / QC performance during all year long (Figure 23) with a more wide-ranging tendency in the last quarter. The high variation on the low REEs values, especially in the heavy rare earth element rage, for a high grade standard like the GRE 02 is considered normal.

Overall, 119 GRE 02 standards were analyzed. The number of outliers for the lanthanum is elevated but the year total average values are similar to the average certified value (Table 16). The coefficient of variation was higher compared to the certified value. On the other hand, the cerium performed better. The all year average value of dysprosium is inferior compared to the certified value. The large amount of the under limit outliers suggest a probable global under estimation of the dysprosium resource for the high grade zone.

Knowing the complexity of analyzing 15 elements with contrasting proportion, the laboratory results for the high grade values are judged acceptable for the resource estimation.

12.3 12.4 Historical Data Verification

The geological data generated after the 1968 discovery up to 1978 included some 546 samples tested for REE over 2,444 metres inside and outside the REE Zone. Most of the assays done on a regular basis were reported on the “paper” (now in PDF) logs for La₂O₃. The few of those drill holes inside the REE Zone are either surrounded by new data, therefore of no importance, or a good temporary support where new data is in progress. The older historical data identified the presence of REE but this data is shallow compared with more recent data (1985, 2011 and 2012).

The data from the surface drill holes 85-01, 85-02 and 85-03 were compared to the data produced by IAMGOLD in 2011. The quality of the data is better today. The 2012 drilling program made the older data least insignificant in number.

At this stage of the REE project exploration, the older historical data is useless. The mineral resource was estimated without this old data.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		76
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 23: GRE 02 QA / QC report, REE project 2012.

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		77
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		78
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 16: Summary of the GRE-02 QA / QC results.

GRE-02


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
	Certified Value		9786			16797			1883			7048			769.2			139.9			262.2			14.62			28.56			2.87			7.96			0.527			2.96			0.42			55.97
	Tolerance		221			837			117			456			32.2			9.07			29.6			4.13			1.51			0.27			5.29			0.066			0.91			0.14			4.39
	Coefficien tof variation		2.26	%		4.98	%		6.21	%		6.47	%		4.19	%		6.48	%		11.29	%		28.25	%		5.29	%		9.41	%		66.46	%		12.52	%		30.74	%		33.33	%		7.84	%
SGS

April	Number of sample		6			6			6			6			6			6			6			6			6			6			6			6			6			6			6
	Average value		9658.3			16916.7			1913.3			7406.7			770.0			141.2			232.5			14.2			26.2			3.0			4.8			0.5			2.3			0.3			51.3
	1 STD		186.3			318.9			50.5			146.0			20.0			6.8			25.6			2.6			1.0			0.1			0.3			0.1			0.5			0.0			1.2
	Coefficient of variation		1.9	%		1.9	%		2.6	%		2.0	%		2.6	%		4.8	%		11.0	%		18.1	%		3.8	%		4.0	%		6.3	%		12.6	%		22.1	%		12.9	%		2.4	%
	% Diff. on average		1.3	%		0.7	%		1.6	%		5.1	%		0.1	%		0.9	%		11.3	%		3.1	%		8.4	%		5.7	%		39.7	%		5.1	%		21.2	%		24.6	%		8.3	%
	Nb. Outliers		0			0			0			0			0			0			1			0			2			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		16.7	%		0.0	%		33.3	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

May	Number of sample		16			16			16			16			16			16			16			16			16			16			16			16			16			16			16
	Average value		9545.0			16468.8			1914.4			7186.9			747.5			140.4			234.1			13.9			26.1			3.0			5.1			0.5			2.3			0.3			51.4
	1 STD		262.2			406.2			48.8			350.3			28.4			4.7			16.5			2.0			1.2			0.1			0.2			0.1			0.5			0.1			1.7
	Coefficient of variation		2.7	%		2.5	%		2.6	%		4.9	%		3.8	%		3.4	%		7.1	%		14.7	%		4.6	%		3.0	%		4.5	%		10.5	%		20.7	%		18.2	%		3.3	%
	% Diff. on average		2.5	%		2.0	%		1.7	%		2.0	%		2.8	%		0.4	%		10.7	%		4.7	%		8.5	%		4.5	%		36.6	%		1.6	%		21.9	%		21.1	%		8.1	%
	Nb. Outliers		4			0			0			1			1			0			0			0			4			0			0			1			0			0			0
	% Outliers		25.0	%		0.0	%		0.0	%		6.3	%		6.3	%		0.0	%		0.0	%		0.0	%		25.0	%		0.0	%		0.0	%		6.3	%		0.0	%		0.0	%		0.0	%

June	Number of sample		14			14			14			14			14			14			14			14			14			14			14			14			14			14			14
	Average value		9577.9			16578.6			1916.4			7156.4			757.9			138.3			227.8			13.4			25.4			3.0			5.0			0.5			2.1			0.3			50.9
	1 STD		184.6			215.5			31.3			183.0			18.9			3.9			15.1			1.3			1.1			0.1			0.1			0.0			0.3			0.0			1.4
	Coefficient of variation		1.9	%		1.3	%		1.6	%		2.6	%		2.5	%		2.8	%		6.6	%		10.0	%		4.3	%		4.3	%		2.0	%		0.0	%		12.9	%		11.6	%		2.7	%
	% Diff. on average		2.1	%		1.3	%		1.8	%		1.5	%		1.5	%		1.2	%		13.1	%		8.6	%		11.2	%		3.3	%		37.1	%		5.1	%		30.0	%		25.2	%		9.0	%
	Nb. Outliers		1			0			0			0			0			0			1			0			9			0			0			0			0			0			0
	% Outliers		7.1	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		7.1	%		0.0	%		64.3	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

July	Number of sample		15			15			15			15			15			15			15			15			15			15			15			15			15			15			15
	Average value		9646.0			16360.0			1952.7			7310.0			772.0			141.0			228.7			13.7			25.2			3.0			5.0			0.5			2.0			0.3			50.3
	1 STD		270.4			282.3			54.6			323.2			31.4			5.3			11.4			2.0			0.8			0.1			0.2			0.0			0.0			0.0			1.5
	Coefficient of variation		2.8	%		1.7	%		2.8	%		4.4	%		4.1	%		3.7	%		5.0	%		14.5	%		3.1	%		4.3	%		3.9	%		0.0	%		0.0	%		8.4	%		3.1	%
	% Diff. on average		1.4	%		2.6	%		3.7	%		3.7	%		0.4	%		0.8	%		12.8	%		6.5	%		11.8	%		4.3	%		37.6	%		5.1	%		32.4	%		27.0	%		10.2	%
	Nb. Outliers		1			0			0			1			1			0			0			0			9			0			0			0			0			0			0
	% Outliers		6.7	%		0.0	%		0.0	%		6.7	%		6.7	%		0.0	%		0.0	%		0.0	%		60.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		79
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

GRE-02


	REE	La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y
August	Number of sample		26			26			26			26			26			26			26			26			26			26			26			26			26			26			26
	Average value		9725.8			16600.0			1953.8			7235.8			766.5			138.5			237.1			15.0			26.0			3.1			5.3			0.5			2.2			0.3			50.9
	1 STD		217.5			511.5			56.9			171.4			18.5			4.6			15.6			2.1			0.7			0.2			0.2			0.0			0.4			0.0			1.1
	Coefficient of variation		2.2	%		3.1	%		2.9	%		2.4	%		2.4	%		3.3	%		6.6	%		14.0	%		2.9	%		5.4	%		4.6	%		8.4	%		19.3	%		13.3	%		2.1	%
	% Diff. on average		0.6	%		1.2	%		3.8	%		2.7	%		0.3	%		1.0	%		9.6	%		2.9	%		9.0	%		9.0	%		33.1	%		2.9	%		24.6	%		23.1	%		9.0	%
	Nb. Outliers		0			0			1			0			0			0			1			0			5			0			0			0			0			0			0
	% Outliers		0.0	%		0.0	%		3.8	%		0.0	%		0.0	%		0.0	%		3.8	%		0.0	%		19.2	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

September	Number of sample		12			12			12			12			12			12			12			12			12			12			12			12			12			12			12
	Average value		9688.3			16975.0			1975.0			7223.3			773.3			140.0			217.3			11.7			25.0			3.1			5.2			0.5			2.3			0.3			51.2
	1 STD		616.6			762.9			104.2			504.2			42.1			8.9			16.5			1.4			1.3			0.1			0.2			0.0			0.5			0.0			1.9
	Coefficient of variation		6.4	%		4.5	%		5.3	%		7.0	%		5.4	%		6.3	%		7.6	%		12.3	%		5.4	%		3.6	%		4.4	%		5.9	%		20.1	%		12.3	%		3.8	%
	% Diff. on average		1.0	%		1.1	%		4.9	%		2.5	%		0.5	%		0.1	%		17.1	%		20.2	%		12.5	%		7.4	%		35.1	%		6.7	%		24.0	%		24.6	%		8.6	%
	Nb. Outliers		2			1			0			1			1			1			2			0			6			0			0			0			0			0			0
	% Outliers		16.7	%		8.3	%		0.0	%		8.3	%		8.3	%		8.3	%		16.7	%		0.0	%		50.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

October	Number of sample		14			14			14			14			14			14			14			14			14			14			14			14			14			14			14
	Average value		9643.6			16764.3			1922.9			7214.3			763.6			139.1			216.4			12.2			24.9			3.1			5.2			0.5			2.2			0.3			51.6
	1 STD		333.8			703.4			50.8			183.4			23.1			5.2			5.4			0.6			0.5			0.1			0.2			0.0			0.4			0.0			2.0
	Coefficient of variation		3.5	%		4.2	%		2.6	%		2.5	%		3.0	%		3.7	%		2.5	%		4.7	%		1.9	%		2.9	%		3.4	%		0.0	%		19.2	%		8.7	%		3.8	%
	% Diff. on average		1.5	%		0.2	%		2.1	%		2.4	%		0.7	%		0.6	%		17.5	%		16.5	%		12.7	%		7.3	%		34.4	%		5.1	%		25.2	%		26.9	%		7.7	%
	Nb. Outliers		3			1			0			0			0			0			0			0			13			0			0			0			0			0			0
	% Outliers		21.4	%		7.1	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		92.9	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%

November	Number of sample		16			16			16			16			16			16			16			16			16			16			16			16			16			16			16
	Average value		9651.3			16375.0			1948.1			7340.0			776.9			139.1			230.4			13.1			25.8			3.0			5.1			0.5			2.1			0.3			51.2
	1 STD		592.8			1045.9			120.8			357.3			39.3			6.2			17.1			1.7			0.7			0.1			0.2			0.0			0.3			0.0			2.4
	Coefficient of variation		6.1	%		6.4	%		6.2	%		4.9	%		5.1	%		4.4	%		7.4	%		13.3	%		2.7	%		4.3	%		4.4	%		0.0	%		16.1	%		12.6	%		4.7	%
	% Diff. on average		1.4	%		2.5	%		3.5	%		4.1	%		1.0	%		0.6	%		12.1	%		10.7	%		9.8	%		5.6	%		35.9	%		5.1	%		28.2	%		24.1	%		8.5	%
	Nb. Outliers		6			2			3			1			2			0			1			0			4			0			0			0			0			0			1
	% Outliers		37.5	%		12.5	%		18.8	%		6.3	%		12.5	%		0.0	%		6.3	%		0.0	%		25.0	%		0.0	%		0.0	%		0.0	%		0.0	%		0.0	%		6.3	%

December	Number of sample		0			0			0			0			0			0			0			0			0			0			0			0			0			0			0
	Average value
	1 STD
	Coefficient of variation		N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A
	% Diff. on average		N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A
	Nb. Outliers
	% Outliers		N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A			N/A


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		80
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

GRE-02

REE

YTD

Number of sample

119

Average value

9640.7

16666.2

1935.5

7247.6

764.4

139.8

227.7

13.4

25.5

3.0

5.1

0.5

2.2

0.3

51.1

1 STD

295.9

457.2

56.7

265.9

26.1

5.6

15.2

1.7

0.9

0.1

0.2

0.0

0.4

0.0

1.5

Coefficient of variation

3.1

2.7

2.9

3.7

3.4

4.0

6.7

12.8

3.7

3.9

4.1

5.4

16.7

12.3

3.0

% Diff. on average

1.5

0.8

2.8

0.6

0.1

13.2

8.1

10.6

5.9

36.2

4.5

25.6

24.6

8.7

Nb. Outliers

% Outliers

14.3

3.4

4.2

0.8

5.0

0.0

43.7

0.0

0.8

0.0

0.8


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		81
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 13. MINERAL PROCESSING AND METALLURGICAL TESTING

Preliminary metallurgical testwork was initiated. Four metallurgical drill holes were executed in March 2011 to provide the metallurgical samples. Samples from two drill holes were combined to make a master composite to begin the metallurgical testwork. In july 2012, all the rejects coming from the 2011 drilling campaign was assembled and sent to a laboratory for a pilot test. In 2012, an exploration drift was developed in the core of the REE zone, about 300m below surface equivalent to mine level 1150, giving and all year round accessibility. About 3,500 tonnes of bulk material was also stocked underground for future study. Testwork still ongoing and the sections below are based on the 2011 evaluation.

13.1 Mineralogy

Mineralogy (QEMSCAM) has been done on three historical drill hole core samples and two additional on two selected new core samples from 2011 drill holes. The objectives of those mineralogy tests were to identify the major REO minerals, the grain size and form (shape and other physical properties). The major REO identified are Bastnaesite and Monazite in fine cluster assemblage.

Additional mineralogy (QEMSCAM) will be performed on new drillholes to try to do a mapping of the REO minerals to confirm their types and the particle size variability inside the deposit.

13.2 Metallurgical testwork

Metallurgical testwork are ongoing on the cumulate material. Different physical separation methods are investigated including gravity, magnetic, flotation and attrition scrubbing. Preliminary testwork showed results in the range of 58% to 70% REO recovery in a 25% to 40% mass pull respectively. Flotation as per other methodologies continues to improve concentration ratio. Preliminary pre leach tests showed a mass reduction in the range of 80% with the majority of the REO reporting to solid. Additional pre leach test are ongoing as well as REO extraction leach tests.

An average recovery of TREO of 53.5% was assumed for the estimate of the mineral resources.

Item 14. MINERAL RESOURCE ESTIMATES

14.1 Presentation of the REE Zone Mineral Resources Estimates

This section provides the Mineral Resource Estimates for REE Zone. All drilling information available through October 9, 2012 was used for this estimate. The REE resource corresponds to an enriched zone of light REEs (“LREE”) which is characteristic of the annular carbonatite type. Grades were interpolated using the Ordinary Kriging (OK) method. The estimated resource is enclosed within the core of the carbonatite complex. In 2012, the near surface “footprint” of the mineralization has been confirmed in all directions Mineral resource classification is classified in accordance with the Canadian Institute of Mining Standards (Table 17).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		82
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 17: Resource Estimate

REE Zone Resource Mineral Estimate (cut off @ 0.5% TREO)

Light REO

Heavy REO

Tonnes

Grade

TREO
Cont.

HREO

Ce₂O₃

La₂O₃

Nd₂O₃

Pr₂O₃

Sm₂O₃

Gd₂O₃

Eu₂O₃

Dy₂O₃

Tb₂O₃

Er₂O₃

Ho₂O₃

Yb₂O₃

Tm₂O₃

Lu₂O₃

Millions

% TREO

Millions kg

(ppm)

Measured

—

Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Measured and Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Inferred

527.2

1.83

9,651.7

277

8046

4298

2968

869

314

141

1.	CIM definitions were followed for Mineral Resources Classification

2.	Mineral Resource were estimated by Réjean Sirois, ing., Vice President, Geology and Resources, G Mining Services Inc.

3.	Mineral Resource are estimated at a cut-off grade of 0.5% TREO

4.	Estimated resource is enclosed within the core of the carbonatite complex and are confined between the bedrock and 700 meters below surface

5.	Numbers may not add due to rounding


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		83
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

14.1.1 Methodology

14.1.1.1 Software

The Gems LabLogger and Logger software application from Gemcom Software International Inc. were used for core logging, database management, modeling the geology, analyzing the data, to perform the grade interpolations, to create and manage the block model as well as report the mineral resources. The software was used by Louis Grenier and supervised by Réjean Sirois, the qualified person for the resource evaluation according to the NI 43-101.

14.1.1.2 Data

The systematic drilling program of 2011 and 2012, confirmed the results found in the historical drill holes. The question was raised as to whether the historical data should be used in the mineral resource estimation of 2012. Every project goes through the same process of discovery and evaluation from sparse data to detailed data. Each activity from exploration through development and production has different goals and method of investigation. Between 1968 and 1985, the carbonatite hosting the REE Zone was discovered and studied using various means, including drilling, airborne and ground geophysics, mapping, bulk sampling, petrographic and mineralogy studies, etc. Some 22 shallow surface drill holes were assayed for REE, some sporadically (1968 to 1978), some systematically (1985) and 18 drill holes reported an REE Zone intersect. The original hand written drill logs (in PDF) reported values for La2O3 only (to represent the REE group) in the first 15 drill holes (1968 to 1978). The 3 drill holes from 1985 report 22 assays, including the major REE. All available data were captured into Gems database.

All historical drill holes compared favorably to the 2011 and 2012 drilling results. Most of this data, especially from the period of 1968 to 1978 does not have the QA/QC support to comply with the NI 43-101 requirement. The historical data deemed to match the geology and the new grade data available. In fact, it made little difference whether it is used or not. Since new data has been acquired in 2012, the historical data (1968 to 1985) were put aside to favor a more uniform quality of data. The following table summarizes the database tables and fields used for the resources estimation as at 31^st of December 2012.

Table 18: Statistics summary of the original assay intervals used in the 2012 resource estimation.


Samples statistics	2012-12-31
Number of samples		15,973
Average length (m)		2.21
Minimum (ppm TREO)		89.82
Maximum (ppm TREO)		123,403
Mean (ppm TREO)		17,107
Median (ppm TREO)		16,611
Variance		91,535,770
Standard deviation		9,567
Coefficient of variation		0.56


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		84
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

14.1.1.3 Composites

Compositing is a technique to group existing samples so they have the same support length and are suitable for the interpolation process on a 3D grid block model. Drilling and sampling are performed on sections where the access is available to take the samples most efficiently. Drilling is also a process of delineating the shape of a mineral resources and increasing the details as the exploration program is ongoing. For the interpolation process of assigning a grade value to each block, the blocks and the samples must have a matching rock type.

For the estimation of the REE Zone mineral resources in 2011, several sets of data were tested against several geological models (Lafleur, P.-J., 2012). Those are:

•

Up to 9,398 original assay data from the ICP table in variable length but mostly 1.5m;

•

3,126 - 5m composites including all drill holes intersecting the REE Zone;

•

2,871 - 5m composites for 1985 to 2011 drill holes exclusively;

•

1,672 - 10m composites including all drill holes intersecting the REE Zone.

Because the drill hole samples in the REE Zone vary in length, it was deemed valid to group samples in equal length. Composites of 5 metres appear to be a good choice according to the geology and the sampling statistics. The final length of 5 metres was retained after looking at different block models section and plan views. Composites of larger size smooth the data. Five metres equal length composites appeared to be a better choice than larger composites to preserve a certain level of details in the grade model. No top grade capping value was used before compositing. This can be done dynamically during the interpolation process using Gemcom software.

The following parametres were applied to the data set used for the 2012 block model. The data set is formed of 7,110 of 5 metres composites including 2011 and 2012 drill holes intersecting the REE zone (Table 19). The 2011 samples were principally of 1.5 to 2 metres long and the 2012 samples were uniformly set at 3 metres long. An equal length composite of 5 metres was judged appropriate to keep a detailed grade distribution in the model.

Table 19: Composites statistics summary used in 2012 resource estimation.


5 m Composites statistics	2012-12-31
Number of samples		7,110
Minimum (% TREO)		0.02
Maximum (% TREO)		8.17
Mean (% TREO)		1.69
Median (% TREO)		1.72
Variance		0.71
Standard deviation		0.84
Coefficient of variation		0.50


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		85
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

14.1.1.4 Variography

Variogram analysis was produced for the 2012 rare earth elements resources estimation. The analysis was made for the reported total rare earth oxide (TREO). A standard approach was used to generate and model the variography. The following steps were followed:

•

Orientation and the dips examination of the solids representing the REE zone to determine the continuity axes.

•

Generate and model the down hole correlogram to determine the nugget effect (closed space variability).

•

Calculate and model the major, semi-major and minor axes of continuity.

The anisotropy direction was determined using the “SAGE” software. The variogram was modeled with a nugget effect and two spherical structures representing the larger scale spatial variability of the datasets. The modeled correlogram is summarized in Table 20. The rotation angles use the Gemcom convention around the ZYZ axes based on the orientation of the block model.

This set of rules are the same for all REE as for TREO except the limits on grade for the Top Cut Value and the Cut-Over High Grade Value have been adjusted depending on the grade distribution of each grade element.

Table 20: Variography statistics

Ranges (m)

Rotation (°)

Element

Nugget effect

1^st Structure

2^nd Structure

TREO (%)

0.422

X:50

Y:150

Z:360

Sill:0.431

X:750

Y:360

Z:700

Sill:0.147

14.1.2 Domain and Volume

The REE Zone mineral resources model is limited to the core of the Saint-Honoré carbonatite complex. The C1 rock type is (the REEs mineralized carbonatite) containing the majority of the mineralization but a surrounding crown, called the transition zone, included the low grade values. The transition zone is formed of mineralized C1 injected in the C2 (massive carbonatite) and the S1 (syenite). The geological model outlying the REE host rock was drawn in 2011. A vertical projection was drawn from the surface compilation map (Figure 5) using a 70° dip cone shape truncated first at 1000m depth in 2011 and extend at 1400m depth in 2012 (Figure 24). The volume is adjusted to the drill hole rock type description and assay values to obtain a 3D cone shape confining the grade interpolation process.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		86
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

The geological model will be reviewed in 2013 with all the new data collected by drilling in 2012. The core zone and the transition zone will be modeled separately in order to improve the orebody pattern. Even if the geological model is not up to date, the 2011 model was judged acceptable to generate the current resource interpolation.

Figure 24: 3D Shape of REE Zone (left) and Niobec mine (right)

LOGO

14.1.3 Specific Gravity (SG)

A systematic specific gravity measurement was realized during the 2012 drilling campaign. The density test was realized by Niobec staff using the water immersion technique on representative core sample of ±15cm long. Each corresponding 3 metres long sample sent for analysis was also analyzed by SGS using an air pycnometre on pulverized samples. Both technic returned similar SG values, the SGS values were choose to be including in the database. The density is now available not only for every different geological interval described but also on a 30 metres frequency along each hole. Coupled with the 2011 values, 777 density measurements, mainly located in the C1, were used for the interpolation (Figure 25).

Even if the new sample average density is 3.11 t/m³, the 2011 density value of 2.86 t/m³ was used has default value for the blocks with insufficient data during the interpolation process.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		87
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 25: Histogram of 777 Density Measures.

LOGO

14.1.4 Block Model

The REE2012 block model was built within the GD_TR_2012 database, Gems 6.3.1 software. The estimated mineral resources have been modeled using a 10-metres cubic block model and grades were estimated using Ordinary Kriging (OK) using 5 metres equal length composites. The block model parametres are summarized in Table 21.

Table 21: REE zone block model parametres (Exploration metres).


	Easting		Northing		Elevation
Minimum coordinates		2,000		5,000		8,600
Maximum coordinates		3,200		6,400		10,100
Block size		10		10		10
Number of blocks		120		140		150
Rotation		0		0		0
References: Exploration Grid; Unit: metres

The domain coding (rock type model) was based on the various wireframe constraints (Table 22). Each block was given a rock type attribute following a rule of precedence. All blocks were first selected and given the rock type 0 (air). Then, all blocks between the topographic surface and the overburden surface were given the rock type 1 (overburden). The rock type 2 (Trenton limestone)


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		88
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

was attributed to all blocks between the overburden surface and the Trenton limestone surface. Finally, the Saint-Honoré carbonatite complex was divided in domain based on the vertical interpolation of the compilation surface map (Figure 5). All blocs under the Trenton limestone surface were given the rock type number associated to their domain (Table 22).

Table 22: Block model coding.


Type	Name	Description	Block Model Code
Topography	Topo	Topography based on header altitude.	0 “air” (above the surface)
Surface	OB	Overburden	1 (above the surface)
Surface	Trenton	Base of the Trenton limestone	2 (above the surface)
Geology	C1	REE mineralized dolomite	10
Geology	C2	Massive dolomite	20
Geology	C3	Nb mineralized, foliated dolomite or calcitite	30
Geology	C5	Nb mineralized, coarse grained dolomite	50
Geology	C6	Pyroxene bearing calcitite	60
Geology	S1	Syenite	110

Within the block model project, a series of models were incorporated for recording the different attributes assigned and calculated in the block model development. These attributes are listed in Table 23 below.

Table 23: Block model attributes.

Attribute name

Description and Content

Unit

Update or creation procedure

Default value

Mapping

Data type

Rock type

Geologic code

0 =Air

1=Overburden

2=Trenton limestone

10=C1

20=C2

30=C3

50=C5

60=C6

110=S1

Limited by surfaces

50% over topo

50% over OB

99% over Trenton

C1 domain

C2 domain

C3 domain

C5 domain

C6 domain

S1 domain

Rock type

Integer

Density

Density value from actual

data

Air=0

Overburden=1.8

Trenton=2.78

Carbonatite=2.86

t/m³

Updated from the rock code profile.

2.86

Density

Single

TREO_PCT

TREO grade

Interpolation, ordinary kriging

TREO

Single

CAT

Resource classification

1=Measured

2=Indicated

3=Inferred

4=Mineral inventory

Based on the search ellipse and limited by depth with the drill hole grid coverage.

CAT

Integer


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		89
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

14.1.5 Grade Interpolation

Grade estimation was done using an ordinary kriging method in Gems 6.3.1 software. The method was applied with a numerical digitation of the 3 x 3 x 3 blocks. The interpolation was performed using 5 metres equal length composites obtained from the original assays. The ordinary kriging was completed using a sample search approach as summarized below:

•

The first interpolation for each block is calculated with a minimum of 6 and a maximum of 12 composites within the search ellipse. The ellipse dimension is limited to 100m x 100m x 100m (Figure 26). There is no maximum number of samples per drill hole.

•

Then, a second interpolation is calculated with a minimum of 2 and a maximum of 12 composites within the search ellipse. The ellipse is less restrictive and has a dimension of 150m x 150m x150m (Figure 27). Once again, there is no maximum number of samples per drill hole.

A top value capping is used in both cases for safety reason. A value of 10% TREO was used for this purpose but no composite were affected since the highest composite grade is 8.17% TREO in the database. In addition, Gems allow reducing the range of influence of high grade values. A high grade limit of 5% TREO was used. In that case, the high grade value is used in the interpolation but limited to half of the ranges described previously or 50m x 50m x 50m for the first pass and 75m x 75m x 75m for the second pass.

The TREO value was not the only grade interpolated at the end of 2012. Each 14 rare earth elements have been interpolated individually for tabulation purpose. These elements were estimated using the same methodology as described for TREO.

Table 24 shows the complete search parametres, Appendix 1 the main section view and plan view of the 2012 block model TREO grade interpolation.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		90
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 24: Interpolation rules


		Interpolation element		TREO	TREO
		Interpolation profile name		TREO_IND	TREO_INF
	Interpolation	Estimation method		Ordinary kriging	Ordinary kriging
		Block variance		Variance by level	Variance by level
		Discretization		3x3x3	3x3x3
		Number of sample used	Min.	6	2
		Number of sample used	Max.	12	12
Data and Constraints	Block model	Block model		REE2012	REE2012
Data and Constraints	Block model	Block selection		All blocks	All blocks
	Composites	Point area source		Compo5_2013-01-18	Compo5_2013-01-18
		Point area Wrk – source name		COMPO5	COMPO5
		Number used	Min.	6	2
		Number used	Max.	12	12
		Max. per hole
	Value	Min. (%)		0	0
		Max. (%)		8	8
		High grade limit (%)		10	10
	Rock code	Description		REE mineralized C1	REE mineralized C1
	Rock code	Target rock code		10	10
	Searching ellipse	Profile name		GMS_TREO	GMS_INF
		Rotation	Z	0	0
			Y	0	0
			Z	0	0
		Range (m)	X	100	150
			Y	100	150
			Z	100	150
		High grade transition limit (%)		5	5
		High grade range (m)	X	50	75
			Y	50	75
			Z	50	75
	Semi variogram	Profile name		GMS_TREO	GMS_TREO
		Nugget effect	CO	0.422	0.422
		Spherical (1) – rotation ZXZ Range of influence for anisotropy:	Sill	0.431	0.431
			X	50	50
			Y	150	150
			Z	360	360
		Spherical (2) – rotation ZXZ Range of influence for anisotropy:	Sill	0.147	0.147
			X	750	750
			Y	360	360
			Z	700	700
	Results	Saving		Overwrite Completely	Update only bocks that have zero grade
	Results	Grade results attribute		TREO_PCT	TREO_PCT


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		91
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 26: TREO indicated resources search ellipse and variography (9900 Level).

LOGO

Figure 27: TREO inferred resource search ellipse and variography (9900 Level).

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		92
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

14.1.6 Classification

The Mineral Resources estimated for the REE deposit were classified according to the “CIM Definition Standards for Mineral Resources and Reserves” (November 27, 2010).

IAMGOLD mandated the consulting firm G Mining Services to support the Niobec geology team in achieving and validating the 2012 resources calculation. These resources are classified according to the drill hole coverage and the REE mineralization continuity interpreted by the qualified person.

The new drilling grid, 100m x 100m down to 350m below surface, define the rare earth elements hosting rock (C1). All limit, north, east, west and south, were intersected and the geometry of the ore body is trace on sub surface. From 350m to 700m below surface, the drill spacing is approximately 100m x 200m. The cylinder shape of the mineralized C1 can be, without confusion, extended at depth. With only a few holes going down to ±1200 metres, the REE zone is judged continuous in grade and still open at depth.

Based on the actual knowledge of the REE zone, the indicated resource corresponds to the first interpolation pass but are limited to the 9650 level (350m below surface) (Figure 28). From 350m the drill definition decreased and the resources were called inferred. Even if the block model was extended at depth, the reported resource estimation was limited to 700 metres below surface. At this stage, no mineral reserves are defined for the REE zone.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		93
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Figure 28: Resource classification, typical section view.

LOGO

14.1.7 Mineral Resource Estimate Statement

The REE resource corresponds to an enriched zone of light REEs (“LREE”) which is characteristic of the annular carbonatite type. LREEs comprise 98.3% of the Total REEs (“TREE”) weight, with the remaining 1.7% of heavy REEs (“HREE”) that could potentially add significant economic value. As indicated in the tables 25, the REE zone contains a total Indicated Resources of 531.4 Million tonnes at an average grade of 1.64% (8.7 billion kilograms contained) Total Rare Earth Oxides (TREO) and a total Inferred Resources of 527.2 Million tonnes at an average grade of 1.83% (9.7 billion kilograms contained) TREO, to a depth of approximately 700 metres below surface.

All assay results are reported in Total Rare Earth Element Oxides (“TREO”). The main rare earth elements found are LREEs: Cerium (Ce), Lanthanum (La), Neodymium (Nd), Praseodymium (Pr) and Samarium (Sm), and HREEs: Gadolinium (Gd), Europium (Eu), Dysprosium (Dy) and Terbium (Tb).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		94
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 25: Resource Estimate

REE Zone Resource Mineral Estimate (cut off @ 0.5% TREO)

Light REO

Heavy REO

Tonnes
Millions

Grade
%
TREO

TREO
Cont.
Millions kg

HREO
(ppm)

Ce₂O₃
(ppm)

La₂O₃
(ppm)

Nd₂O₃
(ppm)

Pr₂O₃
(ppm)

Sm₂O₃
(ppm)

Gd₂O₃
(ppm)

Eu₂O₃
(ppm)

Dy₂O₃
(ppm)

Tb₂O₃
(ppm)

Er₂O₃
(ppm)

Ho₂O₃
(ppm)

Yb₂O₃
(ppm)

Tm₂O₃
(ppm)

Lu₂O₃
(ppm)

Measured

—

Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Measured and Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Inferred

527.2

1.83

9,651.7

277

8046

4298

2968

869

314

141

1.	CIM definitions were followed for Mineral Resources Classification

2.	Mineral Resource were estimated by Réjean Sirois, ing., Vice President, Geology and Resources, G Mining Services Inc.

3.	Mineral Resource are estimated at a cut-off grade of 0.5% TREO

4.	Estimated resource is enclosed within the core of the carbonatite complex and are confined between the bedrock and 700 meters below surface

5.	Numbers may not add due to rounding


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		95
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

14.1.8 Ressource Sensibility to cut off and elevation

Table 26 to 29 present the resource estimate according to different grade group and depth. The estimated resource is enclosed within the core of the carbonatite complex. In 2012, the near surface “footprint” of the mineralization has been confirmed in all directions. Given the homogeneity of the grade values in the block model, it is difficult to outline a low and a high grade zones inside the REE resources. Three holes extended well below the resource model, and reach a maximum length of 1,337 metres. The two deepest holes demonstrated that the REE zone persists uninterrupted at depth and show comparable or higher grades to other intercepts in the resource model. Based on the low variability and all the preceding information, the mineral resources have been classified by level. The indicated resources are from sub-surface to level 9650 (350m depth) and the inferred resources are from levels 9950 to 9300 (700m depth).

Table 26: REE Indicated mineral resources by grade groups.


										Light REO															Main Heavy REO
GRADEGROUP % TREO³	Tonnage Millions		Grade % TREO		TREO Cont. Millions kg		HREO⁴ (ppm)			Ce₂O₃ (ppm)			La₂O₃ (ppm)			Nd₂O₃ (ppm)			Pr₂O₃ (ppm)			Sm₂O₃ (ppm)			Gd₂O₃ (ppm)			Eu₂O₃ (ppm)			Dy₂O₃ (ppm)			Tb₂O₃ (ppm)
> 2.5		32.1		2.72		873.2		384			10764			5635			4131			1181			446			203			94			50			17
2.0 to 2.5		116.9		2.19		2,562.9		357			9621			4991			3699			1062			407			185			86			48			16
1.5 to 2.0		175.0		1.78		3,109.1		338			8614			4432			3336			954			372			174			79			48			15
1.0 to 1.5		120.8		1.25		1,516.0		270			6493			3394			2472			710			278			135			61			41			12
0.5 to 1.0		86.6		0.77		669.1		231			4956			2594			1904			546			223			112			49			37			10

TOTAL		531.4		1.64		8,730.3		312			7887			4092			3034			870			338			159			72			45			14

TREO Signature								1.90	%		48.0	%		24.9	%		18.5	%		5.3	%		2.1	%		1.0	%		0.4	%		0.3	%		0.1	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		96
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 27: REE Inferred mineral resources by grade groups.


										Light REO															Main Heavy REO
GRADEGROUP % TREO³	Tonnage Millions		Grade % TREO		TREO Cont. Millions kg		HREO⁴ (ppm)			Ce₂O₃ (ppm)			La₂O₃ (ppm)			Nd₂O₃ (ppm)			Pr₂O₃ (ppm)			Sm₂O₃ (ppm)			Gd₂O₃ (ppm)			Eu₂O₃ (ppm)			Dy₂O₃ (ppm)			Tb₂O₃ (ppm)
> 2.5		82.1		2.83		2,326.5		311			10688			5862			3747			1131			360			162			76			40			15
2.0 to 2.5		141.3		2.22		3,137.4		344			9743			5115			3635			1057			384			176			82			47			16
1.5 to 2.0		140.1		1.77		2,483.4		279			8147			4345			3040			883			325			143			68			37			12
1.0 to 1.5		90.2		1.27		1,145.2		202			5611			3043			2064			606			226			101			48			27			9
0.5 to 1.0		73.4		0.76		559.2		197			4627			2428			1783			512			211			97			46			28			8

TOTAL		527.2		1.83		9,651.7		277			8046			4298			2968			869			314			141			67			37			12

TREO Signature								1.51	%		43.9	%		23.5	%		16.2	%		4.7	%		1.7	%		0.8	%		0.4	%		0.2	%		0.1	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		97
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 28: REE Indicated mineral resources by depth.


										Light REO															Main Heavy REO
Level	Tonnage Millions		Grade % TREO		TREO Cont. Millions kg		HREO (ppm)			Ce₂O₃ (ppm)			La₂O₃ (ppm)			Nd₂O₃ (ppm)			Pr₂O₃ (ppm)			Sm₂O₃ (ppm)			Gd₂O₃ (ppm)			Eu₂O₃ (ppm)			Dy₂O₃ (ppm)			Tb₂O₃ (ppm)
10000		4.8		1.77		85.9		362			8339			4327			3270			921			386			196			83			46			15
9950		65.3		1.74		1,133.6		350			8069			4132			3241			905			373			181			80			50			15
9900		82.7		1.59		1,312.8		318			7655			3884			2998			852			341			162			73			47			14
9850		84.5		1.59		1,345.7		305			7641			3951			2938			841			330			155			71			44			13
9800		86.3		1.60		1,380.0		304			7805			4082			2963			854			330			156			71			43			13
9750		85.0		1.62		1,375.5		305			7968			4179			3016			872			332			156			71			43			14
9700		82.2		1.70		1,400.4		303			8104			4246			3069			888			334			153			72			43			13
9650		40.5		1.72		696.4		298			8089			4243			3061			890			331			150			71			41			13
9600
9550
9500
9450
9400
9350
9300

TOTAL		531.4		1.64		8,730.3		312			7887			4092			3034			870			338			159			72			45			14

TREO Signature								1.90	%		48.0	%		24.9	%		18.5	%		5.3	%		2.1	%		1.0	%		0.4	%		0.3	%		0.1	%


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		98
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Table 29: REE Inferred mineral resources by depth.


										Light REO															Main Heavy REO
Level	Tonnage Millions		Grade % TREO		TREO Cont. Millions kg		HREO (ppm)			Ce₂O₃ (ppm)			La₂O₃ (ppm)			Nd₂O₃ (ppm)			Pr₂O₃ (ppm)			Sm₂O₃ (ppm)			Gd₂O₃ (ppm)			Eu₂O₃ (ppm)			Dy₂O₃ (ppm)			Tb₂O₃ (ppm)
10000		0		0		0		0			0			0			0			0			0			0			0			0			0
9950		6.2		1.37		85.1		111			2895			1489			1056			310			115			58			25			16			5
9900		8.7		1.41		122.0		114			3084			1665			1075			323			116			59			25			16			5
9850		6.1		1.38		83.6		132			3627			1983			1274			382			137			67			29			20			6
9800		3.8		1.25		47.5		168			4516			2519			1583			474			171			85			38			25			7
9750		2.3		1.15		26.8		203			5316			2953			1850			557			202			100			45			31			9
9700		1.2		1.23		14.9		217			5486			3076			1838			563			199			99			46			36			10
9650		41.7		1.70		710.4		291			8035			4231			3023			883			325			146			69			40			13
9600		79.1		1.76		1,390.0		289			8292			4388			3086			907			328			146			70			39			13
9550		74.9		1.87		1,398.0		292			8456			4490			3115			920			330			147			70			40			13
9500		71.9		1.88		1,355.4		286			8379			4440			3102			909			328			145			69			39			13
9450		69.6		1.88		1,307.1		278			8283			4395			3106			900			326			143			68			36			12
9400		67.2		1.95		1,311.1		283			8485			4589			3101			905			323			147			68			37			13
9350		63.8		1.93		1,230.9		280			8200			4474			2966			867			312			145			66			38			13
9300		30.7		1.85		568.7		274			7891			4271			2867			838			308			141			67			37			12

TOTAL		527.2		1.83		9,651.7		277			8046			4298			2968			869			314			141			67			37			12

TREO Signature								1.51	%		43.9	%		23.5	%		16.2	%		4.7	%		1.7	%		0.8	%		0.4	%		0.2	%		0.1	%

NOTES:

•

Results are presented in situ, unconfined and undiluted

•

Resource modeling used 15,973 samples from the 2011 and 2012 drilling program with 54 elements assayed (with re-assays for high grade samples).


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		99
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 15.

Mineral reserves estimates

No mineral reserves estimates were outline for the REE Zone at this stage.

Item 16.

Mining methods

No mine plan was drawn for the REE Zone. However, the proximity to the existing IAMGOLD Niobec underground mine makes it an obvious choice as long as the value of the mineral resources is equal or higher than the niobium ore. The value of the REE Zone material has been more valuable than the niobium ore recently with the peak in REE prices but that was not always the case historically. The alternative of mining at surface with an open pit is also attractive given the facts:

•

The REE Zone outcrops or is under less than of 30m Trenton limestone and overburden;

•

it would be a lower cost operation than underground near the surface; however contemplating a very deep pit is much less attractive;

The REE Zone could be mined from surface and underground at the same time also. But with the actual works made on the Niobec underground feasibility project (based on a Blocks Caving method), an underground mining method should be preferred for this project.

Item 17.

Recovery methods

Preliminary metallurgical test work results of a REO bulk concentrate shows recoveries between 58% and 70%. Optimization test will continue throughout 2013 and preliminary leach tests as well as extraction leach tests are ongoing. A final recovery of 53.5% of the REE is assumed for the moment.

Item 18.

Project infrastructure

There is no specific project infrastructure for the REE Zone at the moment. However, IAMGOLD owns Niobec Inc. which operates an underground niobium mine just 1km from the REE Zone with an on-site mill and tailings disposal facilities.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		100
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 19.

Market studies and contracts

This section will be addressed when IAMGOLD produces a preliminary economic assessment or scoping study.

Item 20.

Environmental studies, permitting and social or community impact

This section will be addressed when IAMGOLD produces a preliminary economic assessment or scoping study.

Item 21.

Capital and operating costs

This section will be addressed when IAMGOLD produces a preliminary economic assessment or scoping study.

Item 22.

Economic analysis

This section will be addressed when IAMGOLD produces a preliminary economic assessment or scoping study.

Item 23.

ADJACENT PROPERTIES

The recent growing interest for Niobium and REE minerals has generated interest in the general area of the Niobec mine.

At the end of February 2010 DIOS Exploration published the discovery of a satellite carbonatite seven (7) km south of Niobec Mine, the Shipshaw discovery. This prompted the need to review the global setting of the Niobec alkaline and carbonatite complex at the regional scale and evaluate the presence of potential satellite deposits.

The results obtained by DIOS to date in the Shipshaw carbonatite are only anomalous in terms of Nb and REE but this could lead to higher grade or to different styles of mineralization associated to this new carbonatite. An Offer from IAMGOLD to participate in a private Placement of CDN$1.2 M in DIOS Exploration and to enter in an Exploration Option to Joint Venture on the Shipshaw project was accepted and signed by DIOS on January 13th 2011.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		101
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

On the closing of the private placement IAMGOLD was granted an exclusive option (the “Option”) to enter into an Option and Joint Venture Agreement to earn sixty percent (60%) of DIOS’s interest in the Shipshaw Project, Saguenay area, Quebec, within two (2) years of the private placement in DIOS, which Option may not be exercised until the earliest of the time taken by DIOS to spend 80% of the placement on the Shipshaw Carbonatite program (under DIOS’ management), or of a period of one year after IAMGOLD has subscribed to the initial private placement. No less than 80% of the placement would be committed to DIOS’ Shipshaw Carbonatite program, and any surrounding claims. This has given to IAMGOLD 8.95 % of the then issued and outstanding Common Shares of DIOS after the closing of the placement.

DIOS Exploration is planning various field surveys to execute in the coming months and is currently executing a drilling exploration campaign on their main carbonatite discovery. Several prospective areas staked by DIOS and interpreted from government regional geophysical surveys will be also explored in the current year program.

IAMGOLD-Niobec is following the DIOS exploration results to evaluate the potential of the area for their economic activities.

Item 24.

OTHER RELAVANT DATA AND INFORMATION

There is no other relevant data or information that will make this technical report more understandable and not misleading.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		102
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 25.

INTERPRETATION AND CONCLUSIONS

25.1 Geological compilation:

The large 2012 drilling program brought new geological information about the REE zone. A complete compilation of the historical data was done in 2011. The new data was merged into the global data base. In the well-known Saint-Honoré carbonatite complex context, the anterior version of the geological model was judged enough realistic for the purpose of this report. The geological model will be updated in 2013 by interpreting the high definition magnetic survey with the drilling information.

The 2012 definition program focused on the carbonatite complex. The REE mineralization is limited to the REE Zone which corresponds to the central core of the carbonatite complex. The main REE minerals are: bastnaesite and synchysite, both disseminated in the ferrocarbonatite. It is accompanied with hematitic and /or chloritic alteration in the breccia facies but also find as centimetre scale, reddish coloured clusters in the massive facies. The change of textures, from breccia to massive, are often observed but the mineralisation contain is very homogeneous.

25.2 Drilling

IAMGOLD drilling 2012 campaign (33 holes totalling 23, 851 m) tested the REE zone to a vertical depth of 1,200 m. This drilling campaign, defined the tridimensional shape of the REE zone, detailed the resources model and proved the mineralization continuity down to ±1,200m.

It is important to notice that this drilling campaign used a N031°grid orientation (to keep the same orientation as the mine grid) and completed a 100m X 100m grid down to 350m below surface. From 350m to 700m, the drilling grid is spaced to around 100m x 200m. This new spacing allowed to transform the 2011 inferred resources into indicated resource and stretched the grade interpolation at depth.

The 2012 drill campaign, drill core handling, logging and sampling protocols were improved and are according to conventional industry standards and conform to generally accepted best practices.

25.3 Mineral resources estimation – REE zone

This report include a new resource estimate based on 2012 REE exploration and definition update. The drilling added in 2012 increased the confidence level of the block model interpolation and double the resource estimation compared to last year. The REE resource corresponds to an enriched zone of REEs mineral which is characteristic of this annular carbonatite type.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		103
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

As shown in Table 30 below, the REE zone contains a total Indicated Resources of 531.4 Million Tonnes at an average grade of 1.64% Total Rare Earth Oxides (TREO) and a total Inferred Resources of 527.2 Million Tonnes at an average grade of 1.83% TREO, to a depth of approximately 700 metres below surface. The exploration drilling confirmed the mineralization continuity below the fixed level of 700m and still open at depth.

Table 30: 2012 REE resources and reserves estimation.

REE Zone Resource Mineral Estimate (cut off @ 0.5% TREO)

Light REO

Heavy REO

Tonnes
Millions

Grade
%
TREO

TREO
Cont.
Millions kg

HREO
(ppm)

Ce₂O₃
(ppm)

La₂O₃
(ppm)

Nd₂O₃
(ppm)

Pr₂O₃
(ppm)

Sm₂O₃
(ppm)

Gd₂O₃
(ppm)

Eu₂O₃
(ppm)

Dy₂O₃
(ppm)

Tb₂O₃
(ppm)

Er₂O₃
(ppm)

Ho₂O₃
(ppm)

Yb₂O₃
(ppm)

Tm₂O₃
(ppm)

Lu₂O₃
(ppm)

Measured

—

Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Measured and Indicated

531.4

1.64

8,730.3

312

7887

4092

3034

870

338

159

Inferred

527.2

1.83

9,651.7

277

8046

4298

2968

869

314

141

1.	CIM definitions were followed for Mineral Resources Classification

2.	Mineral Resource were estimated by Réjean Sirois, ing., Vice President, Geology and Resources, G Mining Services Inc.

3.	Mineral Resource are estimated at a cut-off grade of 0.5% TREO

4.	Estimated resource is enclosed within the core of the carbonatite complex and are confined between the bedrock and 700 meters below surface

5.	Numbers may not add due to rounding


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		104
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 26.

Recommendations

26.1 Geological compilation and resources modelling.

The new geological information collected during the 2012 drilling program was not totally interpreted. The REE zone contacts were frequently intercepted, especially at depth, and an update of the geological model is required. In the Saint-Honoré carbonatite complex context, the 2011 geological model (Lafleur, P.J., 2012) contained enough detail to update the TREO resources without any doubt on the reliability of the results. By modelling the transition zone (“low grade zone”) and the REE core zone (“high grade zone”) the grade interpolation technique could be applied individually to those new geological domains. The expected results on the resources model will be an increase of the TREO concentration coupled with a decrease of the tonnage in the core zone. With cumulative mineral inventory of over 1 billion tonnes, decreasing the tonnage would not have a negative impact compared to the benefit of improving the grade concentration.

The specific gravity used for the 2012 block model included the 2011 back ground value for the carbonatite of 2.86 t/m³. Basic statistics made over the new available density data base returned an average value for the carbonatite of 3.11 t/m³. This change must be studied. An increasing amount of barite is noted at depth and must necessarily affect the density. A density distribution pattern, within different geological domain or inside one domain, must be integrated to the next geological interpretation and blocks model.

26.2 Mineralogical characterisation and metallurgy.

A Mineralogical study is ongoing. The petrographic, the geochemical and the mineralization characterisation of the REE zone at depth, under 500 metres below surface, are the objects of a master project. Preliminary report should be produced to help the geological modeling and metallurgical test works. A synergy between geological improvement and metallurgical testing would be benefit to the REE project.

The hyper spectral technology might help the geological team to build a homogeneous data base to improve the actual geological model. Even if the traditional core logging description seems to work for outlying the core zone, the spectral technology can precisely evaluated the REE mineral concentration and nature especially in the brecciated facies where the granulometry become smaller. It is recommended to test the benefit of the hyper spectral technology by building the library with the entire representative and available core.

26.3 Drilling

Below surface to 700 metres few drill holes crossed the inferred resources bottom line and demonstrated the continuity at depth of the mineralized zone at depth. An increasing of the REE mineral contain is visually observed and reported by the assays. With the actual drilling pattern, the geological property change, in the holes 2012-REE-033 and 2012-REE-034, may be considered local.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		105
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Local grade variation can be observed in the well define upper level. Tighten the drilling grid would confirmed the increasing grade with depth hypothesis or at leases confined the high grade zone.

More drilling will be necessary to upgrade resources into reserves. A 50m x 50m drilling grid pattern could be tested. The underground access could provide an easy all year round access.

26.4 Cost estimate

Table 31:presented a cost estimate for three items discussed above.


Item	Recommendations	Estimated cost		Description
Item 26.1	Geological compilation and ressources modelling		50,000 $	Senior geologist (6 months)
Item 26.2	Mineralogical characterisation and metallurgy
	Hyper spectral test/study		30,000 $	Estimated cost to build an hyperspectral mineralogical library
	Geological master (University)		30,000 $	Estimated cost for a Master study (15 000$/year)
Item 26.3	Drilling		2,000,000 $	10 000 m, based on the geological modelling
	TOTAL		2,110,000 $


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		106
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 27.

REFERENCES

Anders, E. and Grevesse, N. (1989), Abundances of the elements: Meteoritic and solar”, Geochimica et Cosmochimica Acta 53, pages 197-214.

Belzile, E. (2009), NI43-101 Technical report for Niobec mine, Québec, Canada. 104 pages.

Birkett, T. C. and Simandl, G. J. (1999), Carbonatite-associated deposits: magmatic, replacement and residual. British Columbia Mineral Deposit Profiles, Volume 3

Bonneau, J. and Gauthier, A. (1979), Campagne de sondage, projet St-Honoré. GM 34947, 353 pages. 19 cartes. 11 microfiches.

Denis, T.C. (1937), Mines-minéraux de la région du Lac St-Jean et de Chibougamau. Ministère des ressources naturelles, 25 pages.

Dénommé, E., Villeneuve, D. (1986), Campagne de forages 1985, Zone à TR (Lanthanides). Complexe alcalin de St-Honoré. Niobec, Services TMG Inc., Forages-Rapport.

Dubuc, F. and Lambert, R. (1970), Relevé de scintillomètre, aéroporté, St-Honoré 11-782. SOQUEM, 4 pages, 2 plans.

Fortin, M. (1977), Le Complexe annulaire à carbonatites de St-Honoré (P.Q. Canada) et sa minéralisation à Niobium: Etude Pétrographique et géochimique. Thèsede 3ême cycle, Université Claude Bernard, Lyon, France.

Fournier, A. (1993), Magmatic and Hydrothermal Controls of LREE Mineralization of the St-Honoré Carbonatite, Québec. M.Sc Thesis, McGill University, Montréal, Québec, 147 pages.

Gauthier, A. and Landry, D. (1980), Campagne de sondage, projet St-Honoré. GM 36558, 101 pages. 15 cartes. 7 microfiches.

Gauthier, A. (1979). Étude minéralogique, pétrographique et géochimique de la zone à terres rares de la carbonatite de St.-Honoré. M.Sc. thesis, Université du Québec à Chicoutimi, Québec, Canada, 181 pages.

Gauthier, A. and Sergerie, G. (1978), Étude de la minéralisation de terres rares. GM 34953, 343 pages. 1 carte. 8 microfiches.

Gagnon, G. and Vallée, M. (1973), A summary of the St. Honoré columbium deposits. GM 28923, 60 pages. 6 cartes. 3 microfiches.

Gupta, C. K. and Krishnamurthy, N. (2005), Extractive Metallurgy of Rare earths, CRC Press, 508 pages.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		107
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Hardy, R. and Sauvé, P. (1968), Rapport géologique, projet St-Honoré 13-782. GM 24554, 21 pages. 1 carte. 1 microfiche.

Hébert, C. and Lacoste, P. (1998), Géologie de la région de Jonquière-Chicoutimi (22D/06). RG 96-08, 32 pages, 1 microfiche.

Jooste, R.F. (1958), Bourget area, Chicoutimi and Jonquiere-Kenogami electoral district. Ministère des ressources naturelles, 63 pages, 2 plans.

Kumarapeli, S. (1974), The St-lawrence valley system and its tectonic significance, Doctoral thesis, McGill University, 394 pages.

Lafleur, P.J. and Ben Ayad, A. (2012), NI43-101 technical report to present the mineral resources of the rares earth elements zone, Niobec min, Iamgold Corporation. P.J. Lafleur Geo-Conseil Inc, 145 pages.

Lambert, G. (2003), Compilation de levés géophysiques, propriété Niobec-St-Honoré (P.N. 163). Gérard Lambert Géosciences, 8 pages.

Laurin, A.F. and Sharma, K.N.M. (1975), Région des rivières Mistassini, Péribonka, Saguenay, (Grenville 1965-1967). Ministère des ressources naturelles, 97 pages, 10 plans.

Villeneuve, D and Thivierge, S. (2007), Réserves minières et ressources au 31 Décembre 2007. IAMGOLD Corporation, Mine Niobec, 78 pages

Rankin, A. H. (2004), Carbonatite-associated rare metal deposits: composition and evolution of ore-forming fluid – The fluid inclusion Evidence. In Linneh, R. L. and Samson, I. M., rare-element geochemistry and mineral deposits. Geological ass. of Canada, SC notes Vol 17. GAC, 299-314.

Roy, D.W. (1977), Excursion Géologique au Saguenay; camp de géologie régionale, géologie structurale et pétrographie. Université du Québec à Chicoutimi.

Samson, I. M. and al. (2004), The rare earth elements: behaviour in hydrothermal fluids and concentration in hydrothermal mineral deposits, exclusive of alkaline settings. in: LINNEN, R. L. and Samson, I. M. Rare ¬ element geochemistry and mineral deposits. Geological Association Of Canada Short Course Notes Volume 17, pages 269-298.

Services techniques, Iamgold corporation (2012), Étude de préfaisabilité, projet d’expansion de la Mine Niobec. 361 pages.

Taylor S. R. and McClennan S. M. (1985), The Continental Crust: Its Composition and Evolution. Blackwell, Oxford. 312 pages.

Thivierge, S., (2011), Niobec mine, St-Honoré, Québec, Canada, NI43-101 Technical report. 139 pages


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		108
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Vallée, M. and al. (1969), Projet St-Honoré. GM 25865, 112 pages. 12 cartes. 4 microfiches.

Wall, F. and Mariano, A. N. (1996), Rare earth minerals in carbonatites: a discussion centre on the kangankunde carbonatite, Malawi. ln: Jones, A. P., Wall, F. and Williams, C. T., Rare earth minerals: chemistry, origin and ore deposits. Mineralogical Society Series 7. Chapman and Hall, London, pages 193-225.

Walters A. & co. (2010). British Geological Survey.

Woolley, A. R. and Kjarsgaard, B. A. (2008), Carbonatite occurrences of the world: map and database. Geological Survey of Canada, Open file report 5796.

Gupta, C. K. and Krishnamurthy, N. (2005), Extractive Metallurgy of Rare earths, CRC Press, pages 508.


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		109
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Item 28.

APPENDIX


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		110
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Appendix 1: Main section view and plan view, REE zone 2012

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		111
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		112
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		113
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		114
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		115
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		116
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		117
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		118
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		119
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		120
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		121
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		122
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		123
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		124
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

LOGO


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		125
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*


		NI-43-101 Technical Report

Appendix 2: Eon Geoscience Inc. report


*IAMGOLD Corporation–Updated mineral resource estimate for rare earth elements*		126
*2012 – 18^th March, 2013 as amended on September 19^th, 2013*

IAMGOLD CORPORATION

LEVÉ MAGNÉTIQUE HÉLIPORTÉ

BLOCS LEPINE, BOUSQUET-ODYNO ET NIOBEC

RAPPORT FINAL

Préparé par:

LOGO

Montréal, Québec

15 juillet 2012

LOGO

Table des matières


1.	Introduction	4
	2. Spécifications du levé	4
	2.1. Localisation du levé	4
	2.2. Topographie de la zone des travaux	4
	2.3. Spécifications de vol	5
	2.3.1. Plans de vol	5
	2.3.2. Altitude de vol	5
	2.4. Spécifications techniques	6
	2.4.1. Variations diurnes	6
	2.4.2. Niveau de bruit sur les données magnétiques	6
3.	Équipements utilisés	7
	3.1. Hélicoptère	7
	3.2. Systèmes aéroportés	8
	3.2.1. Magnétomètre	8
	3.2.2. Système d’acquisition de données et compensateur	8
	3.2.3. Système de navigation	8
	3.2.4. Altimètre radar	9
	3.2.5. Altimètre barométrique	9
	3.3. Station de contrôle au sol	10
	3.3.1. Magnétomètre	10
	3.4. Système utilisé pour le contrôle de la qualité	10
4.	Personnel	11
5.	Opérations de terrain	12
	5.1. Bases des opérations	12
	5.2. Calendrier	12
	5.3. Défis opérationnels	12
	5.4. Tests et calibrations	12
6.	Traitement des données	13
	6.1. Projection cartographique	13
	6.2. Traitement des données sur le terrain et contrôle de la qualité	13
	6.3. Données de positionnement	13
	6.4. Données altimétriques et modèle numérique de terrain	14
	6.5. Données aéromagnétiques	14
	6.4.3. Données maillées	16
7.	Produits finaux	17
	7.1. Particularités de la compilation	17
	7.2. Cartes finales	17
	7.3. Données numériques	17
	7.4. Autres produits	17
8.	Conclusion	18
Annexe A – Résultats des tests et calibrations		19
	A.1. “Figure of Merit” (FOM)	19
	A.2. Étalonnage de l’altimètre	21
Annexe B – Description des champs des bases de données finales		22
Annexe C – Rapport quotidien		24

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 2

15 juillet 2012

EON 12002

LOGO

Liste des figures


Figure 1 : Hélicoptère (C-GOVD) utilisé pour l’exécution du levé magnétique			7

Liste des tableaux


Tableau 1 : Coordonnées des zones des travaux			4
Tableau 2 : Spécifications du plan de vol – Bloc Lepine			5
Tableau 3 : Spécifications du plan de vol – Bloc Bousquet-Odyno			5
Tableau 4 : Spécifications du plan de vol – Bloc Niobec			5
Tableau 5 : Personnel impliqué dans le projet			11
Tableau 6 : Calendrier des étapes du projet			12
Tableau 7 : Paramètres de micro-nivellement			15
Tableau 8 : Paramètres de correction IGRF			16

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 3

15 juillet 2012

EON 12002

LOGO

2. Introduction

Ce rapport décrit en détail les opérations de terrain ainsi que toutes les étapes d’acquisition, de vérification et de traitement nécessaires pour l’obtention de données finales de haute qualité par le biais d’un levé magnétique héliporté effectué par EON Geosciences Inc. (EON) pour IAMGOLD Corporation (IAMGOLD) dans les régions de Rouyn-Noranda et St-Honoré, au Québec.

En incluant les tests et calibrations préparatoires et l’acquisition des données, la réalisation du levé magnétique héliporté s’est échelonnée du 3 au 15 mai 2012. Un total de 2 616 km linéaires a été nécessaire afin de couvrir la totalité des blocs Lepine, Bousquet-Odyno et Niobec.

3. Spécifications du levé

3.1. Localisation du levé

Le levé magnétique héliporté, dont fait mention le présent rapport, est situé dans les secteurs de Rouyn-Noranda (blocs Lepine et Bousquet-Odyno) et de St-Honoré (bloc Niobec).

Les limites des différents blocs sont définies par les coordonnées suivantes :


Coordonnées des périmètres du levé (WGS-84)
Lepine (UTM Zone 17N)					Bousquet-Odyno (UTM Zone 17N)					Niobec (UTM Zone 19N)
Coin No.	X		Y		Coin No.	X		Y		Coin No.	X		Y
1		647000		5367795	1		674503		5342002	1		336642		5380106
2		657200		5367795	2		674503		5344198	2		342418		5382251
3		657200		5371094	3		676507		5344198	3		345194		5374704
4		656095		5371094	4		676508		5345305	4		339394		5372579
5		656095		5376009	5		679600		5345305
6		647000		5376009	6		679606		5344708
					7		681002		5344708
					8		680997		5343007
					9		678102		5343002
					10		678102		5341993

Tableau 1 : Coordonnées des zones des travaux

3.2. Topographie de la zone des travaux

Le relief dans les régions du levé est relativement plat. Plus spécifiquement, à l’intérieur des limites du levé, des valeurs topographiques qui varient entre 274 m et 379 m pour Lepine, entre 290 m et 364 m pour Bousquet-Odyno, et entre 85 m et 163 m pour Niobec, sont observées.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 4

15 juillet 2012

EON 12002

LOGO

3.3.

Spécifications de vol

3.3.1.

Plans de vol

Selon les spécifications des plans de vol présentées aux Tableaux 2, 3 et 4, 2 349 km de traverses et 267 km de lignes de contrôle ont été enregistrées pour un total de 2 616 km de lignes.


	Traverses	Lignes de contrôle	Total
Espacement des lignes	75 m	600 m
Direction des lignes	N 0º E	N 90º E
Kilométrage	1 043 km	134 km	1 177 km

Tableau 2 : Spécifications du plan de vol – Bloc Lepine


	Traverses	Lignes de contrôle	Total
Espacement des lignes	50 m	500 m
Direction des lignes	N 0º E	N 90º E
Kilométrage	311 km	34 km	345 km

Tableau 3 : Spécifications du plan de vol – Bloc Bousquet-Odyno


	Traverses	Lignes de contrôle	Total
Espacement des lignes	50 m	500 m
Direction des lignes	N 160º E	N 70º E
Kilométrage	995 km	99 km	1 094 km

Tableau 4 : Spécifications du plan de vol – Bloc Niobec

Les déviations des plans de vol par rapport aux plans de vol théoriques (fichiers d’entrée pour la navigation) ont été analysées afin d’éliminer les portions de ligne pour lesquelles l’espacement entre deux lignes adjacentes était inférieur à 50% ou supérieur à 150% de l’espacement nominal sur une distance de plus de 2 000 mètres.

Les portions de lignes devant faire de nouveau l’objet d’un vol ont été revolées en prenant soin de respecter les exigences minimales de chevauchement telles que décrites dans les spécifications de vol du contrat.

3.3.2. Altitude de vol

Le levé magnétique héliporté a été réalisé avec une altitude théorique de 30 m.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 5

15 juillet 2012

EON 12002

LOGO

Afin d’assurer une différence d’altitude minimale aux intersections entre les traverses et les lignes de contrôle, et par le fait même assurer une meilleure qualité des données nivelées, une surface moulant le relief topographique a été utilisée pour la navigation. Cette surface a été calculée en considérant le relief topographique et une pente de 15%. Les données topographiques disponibles sur SRTM furent utilisées pour le calcul de la surface de vol.

Les tolérances d’altitude ont été limitées à ± 20% de la surface de vol. De plus, cette limite de tolérance de ± 20% fut conservée afin d’évaluer les endroits où la déviation verticale entre l’élévation GPS de l’hélicoptère et la surface de vol calculée dépassait les normes acceptables et semblait affecter les données en maille.

3.4. Spécifications techniques

Lors du contrôle de la qualité effectué quotidiennement, les spécifications techniques suivantes, telles que définies dans le contrat, en plus des spécifications de vol, ont été considérées pour la sélection des lignes ou des parties de ligne à revoler ainsi que pour l’acceptation finales des données.

3.4.1. Variations diurnes

Pour la station de base magnétique, la déviation maximale tolérée sur une longueur de corde d’une minute fut de 2,0 nT (crête à crête) sur un total cumulatif de 20% ou plus de chaque ligne de vol.

3.4.2. Niveau de bruit sur les données magnétiques

En tout temps, la 4^ième différence fut utilisée pour détecter et évaluer la présence de bruit sur les données magnétiques. Une enveloppe de bruit de 0,1 nT fut prise en compte pour l’acceptation finale des données.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 6

15 juillet 2012

EON 12002

LOGO

4. Équipements utilisés

4.1. Hélicoptère

Un hélicoptère AS350BA, immatriculation C-GOVD, a été utilisé pour ce projet (Figure 1). Cet hélicoptère était équipé d’un rostre attaché au patin d’atterrissage de l’hélicoptère d’une longueur de 9 mètres permettant l’installation du senseur magnétique.

Les caractéristiques de l’hélicoptère utilisé sont les suivantes:


Type :		AS350BA
Immatriculations :		C-GOVD
Autonomie (km) :		600
Vitesse de levé (m/s) :		Moyenne de 41 (varie de 21 à 57) ® Lepine Moyenne de 45 (varie de 26 à 56) ® Bousquet-Odyno Moyenne de 45 (varie de 17 à 58) ® Niobec
Essence :		Jet
Consommation d’essence (L/hr) :		170
Valeur pour le FOM (nT) :		2,115

LOGO

5. Figure 1 : Hélicoptère (C-GOVD) utilisé pour l’exécution du levé magnétique

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 7

15 juillet 2012

EON 12002

LOGO

5.1. Systèmes aéroportés

Pour l’exécution de ses levés magnétiques héliportés, EON utilise des équipements à la fine pointe de la technologie tel que décrit dans les sections suivantes.

5.1.1. Magnétomètre

Un senseur Geometrics G822A, combiné à un compteur de haute résolution, a été utilisé pour mesurer les variations du champ magnétique total. Les spécifications de ce type de magnétomètre sont les suivantes :


Manufacturier :		Geometrics
Type et Modèle :		Césium G822A
Plage ambiante (nT) :		20 000 – 100 000
Sensibilité (nT) :		±0,0005
Précision absolue (nT) :		± 3
Enveloppe de bruit (nT) :		< 0,01
Intervalle d’échantillonnage (sec) :		0,1
Effet de cap (nT) :		< 0,15

5.1.2. Système d’acquisition de données et compensateur

Le système d’acquisition et de compensation ‘’Airborne Data Acquisition & Adaptive Aeromagnetic Real-Time Compensation (DAARC500)’’ de RMS Instruments a été utilisé par EON. Ce système permet un taux d’échantillonnage de 10 Hz (0,1 sec) et utilise un magnétomètre « fluxgate » à trois axes afin de suivre la position et les mouvements de l’hélicoptère par rapport au champ magnétique ambiant et d’ainsi calibrer la compensation selon une série de manœuvres standards de « roll », « pitch », et « yaw » dans les directions du levé.

Les entrées analogues et sérielles sont échantillonnées au même taux, ou à un sous-multiple, que les données du magnétomètre. Les données géophysiques et les données de positionnement GPS brutes sont enregistrées dans des fichiers binaires avec des marqueurs de temps et d’événement de début qui permettent une corrélation simple avec les autres données et le signal PPS du récepteur GPS. Le système d’acquisition est synchronisé au temps GPS par un signal GPS d’une seconde (PPS). Puisque la position GPS et l’UTC sont liés au « pulse » GPS, une corrélation précise est maintenue.

Ce système fournit une sortie graphique de haute résolution à un écran couleur intégré qui permet le suivi en temps réel de l’acquisition des données par l’opérateur.

5.1.3. Système de navigation

Le tableau suivant décrit le système de navigation ainsi que le système GPS différentiel héliporté utilisés pour la navigation en temps réel et l’enregistrement de la trajectoire de vol :


Système GPS différentiel héliporté
Manufacturier :		NovAtel
Modèle :		ProPak-V3
Système différentiel temps-réel :		WAAS
Système différentiel post-mission :		PPP
Fréquences :		L1-L2

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 8

15 juillet 2012

EON 12002

LOGO


Précision (m) :		±1
Nombre de canaux :		12
Système de navigation :		Ag-Nav Linav
Affichage pour pilote :		ACL avec indicateurs «up/down» et «left/right»
Intervalle d’échantillonnage (sec) :		1

Les principales caractéristiques du système de navigation sont les suivantes:

Affichage graphique du plan et de la trajectoire de vol à partir des données GPS différentielles en temps réel;

Navigation verticale utilisant une surface moulant le relief topographique (LiNav-3D);

Indicateurs d’écarts par rapport à la ligne suivie et indicateurs de distance effectuée et à faire, indicateurs d’écarts verticaux par rapport a la surface suivie;

Modes d’opération en carte, points de destination waypoint ou selon des lignes planifiées;

Enregistrement des données GPS brutes pour traitement post-mission.

5.1.4. Altimètre radar

Les principales caractéristiques de l’altimètre radar installé dans l’hélicoptère sont les suivantes:


Manufacturier :		FreeFlight Systems
Modèle :		TRA-3000
Plage (pi) :		40 – 2 500
Précision :		± 5 pi (0-100 pi) ± 5% (100-500 pi) ± 7% (500-2500 pi)
Intervalle d’échantillonnage (sec) :		0.1

5.1.5. Altimètre barométrique

L’altitude barométrique a été calculée des données de pression et de température acquises en vol. Le tableau suivant décrit les caractéristiques des senseurs de pression et de température utilisés pour ce levé :


Manufacturier :	Vaisala	Vaisala
Modèle :	PTB110	HMP155
Paramètre mesuré :	Pression atmosphérique	Température ambiante
Précision:	± 0,3 hPa (mbar)	± 0,17 °C
Intervalle d’échantillonnage (sec) :	0.1	0.1

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 9

15 juillet 2012

EON 12002

LOGO

5.2. Station de contrôle au sol

5.2.1. Magnétomètre

Une station de contrôle au sol du champ magnétique (voir les caractéristiques ci-dessous) fut installée à chaque base (Rouyn-Noranda et St-Honoré) afin d’enregistrer sans interruption les variations diurnes.


Manufacturier :		GEM Systems
Type :		Overhauser
Modèle :		GSM-19
Plage dynamique (nT) :		15 000 – 120 000
Sensibilité (nT) :		± 0,001
Précision absolue (nT) :		± 0,1
Intervalle d’échantillonnage (sec) :		1
Niveau de bruit (nT) :		< 0,1 nT

5.3. Système utilisé pour le contrôle de la qualité

Durant les opérations de terrain, la vérification quotidienne des données, provenant des tests et calibrations ou du levé magnétique, a été réalisée en utilisant les composantes suivantes.


Ordinateurs portables :		Pentium PCs
Logiciel :		Geosoft Oasis montaj
Transmission des données :		Site FTP

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 10

15 juillet 2012

EON 12002

LOGO

6. Personnel

Le personnel d’EON ayant participé au bon déroulement du projet est présenté dans le Tableau 5 ci-dessous :


Opérations de terrain
Gestionnaire de projet		Khaled Moussaoui Abbas Moussaoui
Gestionnaire de terrain/Géophysicien Contrôleur de la qualité sur le terrain		Rick Bailey
Pilote		Stéphane Caron
Responsable des instruments		Paul Beaubien
Ingénieur de l’entretien		Hélicoptères Panorama
Traitement des données
Traitement des données finales		Rick Bailey Gérard Tessier
Produits finaux
Préparation des cartes		Marc Richard
Rapport final		Khaled Moussaoui Rick Bailey

Tableau 5 : Personnel impliqué dans le projet

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 11

15 juillet 2012

EON 12002

LOGO

7. Opérations de terrain

7.1. Bases des opérations

Pour les blocs Lepine et Bousquet-Odyno, la ville de Rouyn-Noranda fut utilisée comme base des opérations. L’aéroport de Rouyn-Noranda a offert tous les services nécessaires, incluant l’essence Jet et la planification de vols. Pour le bloc Niobec, la ville de St-Honoré fut utilisée comme base des opérations. L’aéroport de St-Honoré a offert tous les services nécessaires, incluant l’essence Jet et la planification de vols.

7.2. Calendrier

Le Tableau 6 qui suit, présente le déroulement des différentes étapes du projet incluant les tests et les calibrations ainsi que la mobilisation et démobilisation. L’acquisition des données fut complétée le 15 mai 2012, pour un total de 2 616 km.


Hélicoptère	Date	Description
	1 – 2 mai 2012	Installation des équipements dans l’hélicoptère à Alma
	2 – 3 mai 2012	Tests pré-mobilisation
	3 mai 2012	Mobilisation à Rouyn-Noranda
	3 mai 2012	Tests pré-levé
AS350BA	4 – 5 mai 2012	Acquisition des données du bloc Lepine
(C-GOVD)	6 mai 2012	Acquisition des données du bloc Bousquet-Odyno
	7 mai 2012	Mobilisation à St-Honoré
	7 mai 2012	Tests pré-levé
	9 – 15 mai 2012	Acquisition des données du bloc Niobec
	15 mai 2012	Fin du levé / Démobilisation

Tableau 6 : Calendrier des étapes du projet

7.3. Défis opérationnels

La réalisation du levé magnétique héliporté a nécessité une collaboration et une communication constantes avec IAMGOLD, afin de coordonner les opérations avec les municipalités locales.

L’acquisition des données magnétiques fut interrompue principalement par les restrictions de vol au-dessus de la municipalité de St-Honoré (fins de journée et fins de semaines). De plus, les conditions météorologiques difficiles ont causé quelques journées de production perdues.

Tous ces problèmes sont détaillés dans le rapport quotidien présenté en Annexe C.

7.4. Tests et calibrations

Avant de débuter l’acquisition des données magnétiques, les tests et calibrations suivants ont été exécutés par l’hélicoptère en utilisant l’équipement décrit à la section 3.

•

“Figure of Merit” (FOM)

•

Étalonnage des altimètres

Les résultats détaillés de ces tests sont présentés en Annexe A.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 12

15 juillet 2012

EON 12002

LOGO

8. Traitement des données

L’objectif principal du levé était l’acquisition et le traitement des données héliportées magnétiques. Le traitement préliminaire des données sur le terrain ainsi que le traitement final des données furent entièrement exécutés avec le logiciel Oasis montaj de Geosoft.

8.1. Projection cartographique

Les projections suivantes ont été utilisées pendant le projet (navigation, traitement des données, préparation des cartes) :


• Projection :		UTM Zone 17N (Lepine et Bousquet-Odyno)
		UTM Zone 19N (Niobec), MTM Zone 7 pour les mailles et cartes finales
• Type :		Transverse Mercator
• Datum :		WGS-84
• Ellipsoïde de référence :		WGS-84
• Transformation locale :		WGS-84 World
• Unité de longueur :		Mètres

8.2. Traitement des données sur le terrain et contrôle de la qualité

À la fin de chaque vol, les données acquises étaient copiées et sauvegardées sur une unité USB, et transférées au géophysicien sur le terrain afin qu’il effectue le contrôle de la qualité et le traitement préliminaires des données tel que décrit dans ce qui suit.

En premier lieu, la trajectoire de vol était vérifiée afin de s’assurer que les lignes volées respectaient les exigences du contrat, espacement des lignes de vol, chevauchement advenant des portions de lignes ou des reprises de ligne, extension à l’extérieur du levé, etc. Une vérification de la couverture était réalisée et le kilométrage accepté était calculé et noté dans le rapport journalier de vol.

Par la suite, chacun des canaux de données enregistrés était affiché en profil, puis mis en maille, afin de vérifier que les spécifications mentionnées au contrat étaient respectées et afin de détecter rapidement d’éventuels problèmes au niveau du système d’acquisition ou de l’instrumentation. Une analyse statistique était également réalisée afin d’identifier les valeurs erronées et compléter ainsi le contrôle de la qualité.

À ce stade, toute ligne ou tout segment de ligne pouvant nécessiter un re-vol était noté. Un nivellement préliminaire était régulièrement exécuté de façon à évaluer l’impact de ces segments de lignes sur la qualité générale du produit final. Spécifiquement, la couverture, les déviations du plan et de la surface de vol, l’activité diurne, le niveau de bruit sur les données magnétiques, et les problèmes opérationnels (tel que le manque de données) sont vérifiés et les reprises de vol ensuite identifiées. Toutes les données finales ont respecté les spécifications du contrat.

8.3. Données de positionnement

Les données de positionnement RT-DGPS étaient transmises en temps réel à partir de l’unité GPS ProPak-V3 (NovAtel) vers le système d’acquisition DAARC500 pour synchronisation, enregistrement et navigation horizontale/verticale. Les corrections différentielles captées en temps réel par l’unité ProPak-V3 provenaient du système WAAS. Un contrôle quotidien de la qualité des données RT- DGPS était effectué de façon à s’assurer que leur précision demeurait appropriée pour fins de navigation (<5 m).

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 13

15 juillet 2012

EON 12002

LOGO

Les données GPS brutes enregistrées en vol ont été utilisées dans le traitement post-mission du positionnement (PP-DGPS), en utilisant le système CSRS-PPP disponible sur le site web de Ressources naturelles Canada, afin d’obtenir des données de positionnement GPS finales en moins de quatre (4) heures. Le contrôle de la qualité final du GPS incluait l’inspection des profils de vitesse PP-DGPS ainsi qu’une comparaison avec les données RT-DGPS et d’altitude barométrique, de façon à s’assurer de l’amélioration de la précision en PP-DGPS (<1 m). Les données PP-DGPS furent de haute qualité et ne nécessitèrent aucune correction pour sauts ponctuels.

Les données de positionnement finales sont sans exception de type PP-DGPS. Elles furent utilisées pour le contrôle final du suivi de la trajectoire de vol planifiée, pour le contrôle de la qualité et l’édition des données radar via le calcul d’un modèle numérique de terrain, ainsi que pour le calcul des différences d’altitude aux intersections. Cette procédure a permis un contrôle additionnel du GPS, des données radar plus fiables, ainsi qu’une détection précise des segments de ligne présentant des déviations excessives pouvant justifier un re-vol, si la qualité des données en maille s’en trouve affectée.

8.4. Données altimétriques et modèle numérique de terrain

Tel que mentionné à la section précédente, le contrôle de la qualité sur le site et la correction finale des données radar ont été réalisés à partir du calcul d’un modèle numérique de terrain (DEM) utilisant l’altitude finale PP-DGPS et sa comparaison avec le modèle topographique publié par SRTM.

Les corrections requises sur les données radar ont été déterminées comme suit :

•

Corrections distinctes des données ponctuelles erronées (spikes) et des sauts de niveau;

•

Correction initiale, basée sur le nivellement des intersections DEM entre les lignes traverses-contrôles, visant le retrait des dérives radar à basse fréquence;

•

Nivellement brut DEM basé sur un filtre de 0,6 sec appliqué sur les données radar et la décorrugation directe de la maille DEM résultante.

Les données radar finales ont été maillées en utilisant uniquement les lignes de traverse et une cellule de maillage de 10 m (pour Bousquet-Odyno et Niobec) et de 15 m (pour Lepine), en utilisant l’algorithme de courbure minimale du logiciel Oasis montaj de Geosoft.

8.5. Données aéromagnétiques

Les données magnétiques provenant de la station de contrôle au sol étaient analysées quotidiennement afin de s’assurer qu’aucune donnée en vol n’ait été enregistrée durant des périodes présentant des micro-pulsations ou de l’activité diurne excédant les spécifications. Bien que toutes les précautions aient été prises afin d’installer la station de base dans des zones magnétiquement calmes, loin de toute activité humaine, passage de véhicules, lignes de transmission ou autre, les données magnétiques des stations de base furent également vérifiées afin de noter, et corriger s’il y a lieu, tout signal d’origine culturelle.

La correction du signal magnétique dû à la direction et aux manœuvres de l’hélicoptère fut effectuée durant l’acquisition via une compensation en temps réel utilisant les coefficients de compensation calculés lors des tests de FOM. Tel que mentionné auparavant dans la section 5.4, les résultats détaillés de ces tests sont présentés en Annexe A. La compensation en temps réel permet également le contrôle de la qualité des données par l’opérateur, lui permettant ainsi d’établir si les turbulences ou autres conditions de vol sont nuisibles à la qualité des données et par le fait même, déterminer si l’arrêt du vol en cours est nécessaire.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 14

15 juillet 2012

EON 12002

LOGO

Après application d’une correction de décalage sur les données du champ magnétique total compensées, les données en profil furent vérifiées sur une base quotidienne afin d’évaluer l’efficacité de la compensation. Par la même occasion, une quatrième différence fut calculée à partir des données du champ magnétique total compensé afin de déterminer le niveau de bruit et de procéder à l’édition des données en profil, où les données ponctuelles erronées (spikes) ont été éliminées.

Dans le but d’éliminer les variations diurnes des profils de données magnétiques enregistrées en vol, une correction diurne fut calculée en utilisant les profils de la base éditée. La correction diurne fut obtenue par la soustraction d’une valeur moyenne de 55 979,9 nT (pour Lepine et Bousquet-Odyno) et de 55 586,9 nT (pour Niobec), et par l’application subséquente d’un filtre spatial 1-D FFT Butterworth de 1 200 m. La longueur du filtre fut déterminée selon l’espacement des lignes de contrôle et le degré d’amélioration observé suite à la correction sur les différences du champ magnétique aux intersections.

Un signal IGRF partiel fut ensuite utilisé afin de minimiser l’effet des déviations de la surface de vol entre lignes adjacentes. Les champs IGRF 2010 furent premièrement calculés pour les surfaces de vol. Un filtre passe-bas de 5 sec fut ensuite appliqué. Puis, le signal IGRF partiel fut calculé et enlevé du champ magnétique total (TMF) édité pour obtenir un TMF corrigé pour l’altitude.

La prochaine étape du traitement du TMF fut le nivellement, qui consiste à la distribution statistique appropriée des erreurs d’intersections traverses-contrôles, afin d’obtenir le modèle de correction le plus lisse possible sur chaque line. Un modèle de correction simple initial (moyenne) est premièrement appliqué sur les lignes de contrôle, et ensuite sur les lignes de traverse après avoir mis à jour les intersections sur les lignes de contrôle corrigées. Ce processus est poursuivi de façon itérative, utilisant des modèles de correction de longueur d’onde progressivement décroissante, afin de corriger davantage les erreurs résiduelles des passes précédentes. Les modèles de correction finaux ont été basés sur une spline à tension, avec tension = 0,0 et aspect lisse = 0,1 (traverse), tel que permis par le réseau des lignes.

Du micro-nivellement, un processus basé sur l’application de filtres en maille directionnels, a été exécuté, afin d’enlever les corrugations sur le TMF résiduel nivelé (visibles sur la première dérivée) observées surtout dans les intervalles de traverse entre les lignes de contrôles. De telles corrections furent inévitables dus, en partie, au ratio de réseau 10:1/8:1, mais surtout aux grandes déviations en altitude de la surface de vol tel que requis au-dessus des zones habitées. Les corrugations sont souvent les plus fortes dans des régions de haut gradient magnétique. Comme tel, un processus de micro-nivellement à deux (2) passes est appliqué. Les deux (2) passes utilisent un seuil limite variable pour minimiser l’application de filtres dans les zones où le nivellement par intersection est efficace. La première passe est contrôlée par la déviation en altitude de la surface de vol, tandis que la deuxième passe est contrôlée par l’activité relative du bloc, utilisant le signal analytique du TMF nivelé. Les paramètres de contrôle et de seuil limite sont spécifiés dans le Tableau 7 ci-dessous.

Bloc

Longueur
du filtre
en maille
(m)

Longueur
du filtre en
profil (m)

Passe 1

Déviation de la
surface de vol (m)

Seuil limite
(nT)

Passe 2

Signal
analytique (nT)

Seuil limite
(nT)

Lepine

450

300

-6 à 6

<2,0

-10 à -6 et 6 à 10

Interpolation linéaire 7 à 50

2,0 à 3,0

Interpolation linéaire 7 à 50

<-10 ou >10

>3,0

Bousquet-Odyno

250

-6 à 6

<1,0

-10 à -6 et 6 à 10

Interpolation linéaire 5 à 25

1,0 à 1,5

Interpolation linéaire 0 à 25

<-10 ou >10

>1,5

Niobec

250

-6 à 6

<2,0

-10 à -6 et 6 à 10

Interpolation linéaire 7 à 50

2,0 à 3,0

Interpolation linéaire 7 à 50

<-10 ou >10

>3,0

Tableau 7 : Paramètres de micro-nivellement

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 15

15 juillet 2012

EON 12002

LOGO

Le micro-nivellement dans la première passe a été appliqué en calculant la maille d’erreur sur le TMF en appliquant un filtre passe-haut Butterworth (se référer au Tableau 7 pour les longueurs d’onde limites, ordre=0) et un filtre cosinus directionnel (direction=180° pour Lepine et Bousquet-Odyno, direction=340° pour Niobec, degré de la fonction cosinus=1,5). La maille d’erreur est enlevée du TMF nivelé par lignes de contrôle pour produire une maille corrigée. Cette maille est ré-échantillonnée dans la base de données et le champ d’erreur est créé par la soustraction des profils nivelés par lignes de contrôle. Ce champ d’erreur est ensuite limité (seuil limite contrôlé par la déviation de la surface de vol) et un filtre passe-bas est appliqué. Ceci devient la première passe de la correction de micro-nivellement, qui est appliquée au champ magnétique nivelé par lignes de contrôle. Ce processus est ensuite répété sur le TMF micro-nivelé résultant (première passe), cette fois utilisant le signal analytique comme contrôle pour le degré de limitation. La correction totale de micro-nivellement est l’addition des deux (2) passes.

Finalement, le champ géomagnétique de référence (IGRF) fut calculé selon le modèle IGRF-2010 en utilisant une date fixe, la position d’acquisition et une altitude de vol moyenne fixe, pour chaque bloc. Les paramètres de correction IGRF sont spécifiés dans le Tableau 8 ci-dessous. Le champ magnétique total résiduel fut obtenu par la soustraction du champ géomagnétique de référence du champ magnétique total micro-nivelé.


Bloc	Altitude IGRF (m)	Date IGRF
Lepine	342,5	2012/05/04
Bousquet-Odyno	348,2	2012/05/06
Niobec	163,0	2012/05/12

Tableau 8 : Paramètres de correction IGRF

6.4.3. Données maillées

Les données magnétiques finales ont été maillées en utilisant uniquement les lignes de traverse et une cellule de maillage de 10 m (pour Bousquet-Odyno et Niobec) et de 15 m (pour Lepine), en utilisant l’algorithme de courbure minimale du logiciel Oasis montaj de Geosoft. Le calcul de la dérivée première verticale a été réalisé en utilisant la fonction magmap1 de ce logiciel.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 16

15 juillet 2012

EON 12002

LOGO

9. Produits finaux

9.1. Particularités de la compilation


Échelle des cartes :		1:10 000 (Lepine et Niobec)
		1:5 000 (Bousquet-Odyno)
Coordonnées (WGS-84) :		UTM Zone 17N (Lepine et Bousquet-Odyno)
		UTM Zone 19N (Niobec), MTM Zone 7 pour les mailles et cartes finales
Quadrillage des mailles :		15 mètres (Lepine) et 10 mètres (Bousquet-Odyno et Niobec)

9.2. Cartes finales

Les cartes finales suivantes ont été remises à IAMGOLD en deux (2) copies papier :

•

Le champ magnétique total (avec et sans contours)

•

Le champ magnétique total résiduel (avec et sans contours)

•

La dérivée première verticale du champ magnétique total

•

La trajectoire de vol

9.3. Données numériques

Les données numériques suivantes ont été livrées à IAMGOLD en trois (3) exemplaires sur DVD :


Résumé des produits numériques finaux
Produit	Données	Format et projection
Bases de données	Données magnétiques	Geosoft GDB, WGS-84
Mailles	Champ magnétique total	Geosoft GRD, WGS-84
	Champ magnétique total résiduel	Geosoft GRD, WGS-84
	Dérivée première verticale du champ magnétique total	Geosoft GRD, WGS-84
Cartes 1:50 000	Champ magnétique total (avec et sans contours)	Geosoft MAP et PDF, WGS-84
	Champ magnétique total résiduel (avec et sans contours)	Geosoft MAP et PDF, WGS-84
	Dérivée première verticale du champ magnétique total	Geosoft MAP et PDF, WGS-84
	Trajectoire de vol	Geosoft MAP et PDF, WGS-84
Rapport	Logistique, traitement et documentation des produits	WORD et PDF

Une description complète des bases de données finales est fournie en Annexe B.

9.4. Autres produits

•

Trois (3) copies papier du rapport final

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 17

15 juillet 2012

EON 12002

LOGO

10. Conclusion

L’acquisition des données magnétiques héliportées des blocs Lepine, Bousquet-Odyno et Niobec, situés dans les régions de Rouyn-Noranda et St-Honoré, a été complétée en utilisant un hélicoptère AS350BA, C-GOVD, permettant la mesure du champ magnétique total, grâce à un magnétomètre monté dans un rostre fixé au patin d’atterrissage de l’hélicoptère.

Une fois mobilisé sur le site des travaux, environ deux (2) semaines ont été nécessaires pour acquérir les 2 616 km linéaires de données magnétiques.

Les problèmes majeurs rencontrés lors de ce levé, qui ont quelque peu ralenti la production, sont les restrictions de vol au-dessus de la municipalité de St-Honoré et les mauvaises conditions météorologiques. La totalité des données acquises respecte les exigences d’IAMGOLD et a permis la production de produits finaux de haute qualité.


Soumis par :
		Abbas Moussaoui, Ing. (#29152)
		Directeur général
		EON Géosciences Inc.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 18

15 juillet 2012

EON 12002

LOGO

11. Annexe A – Résultats des tests et calibrations

A.1. “Figure of Merit” (FOM)


EON Geosciences Inc.

FOM Test:	MAG1: Front stinger	Date:	03-May-12
Slot file	mat6.x	Flight:	802

Project:	12002	Location:	Rouyn-Noranda
Client:	IAMGOLD	Helicopter	C-GOVD
Pilot:	Stephane Caron	Sensors:	front stinger
Operator	Paul Beaubien	Altitude:	3100m
Processor:	Rick Bailey	Comp:	RMS Comp

Notes: 8 seconds high pass filter used to determine amplitudes.

MAG 1 Results

ucomp

comp

Total

119.472

2.413

49.512


S	Line	start	Fid range end	ucomp	comp	IR
Pitch		81159	81285	6.750	0.225	30.000
Roll	S180	81305	81349	20.070	0.231	86.883
Yaw		81357	81386	6.450	0.120	53.750

Total				33.270	0.576	57.760


E	Line	start	Fid range end	ucomp	comp	IR
Pitch		81117	81117	5.986	0.200	29.930
Roll	S90	81159	81159	0.530	0.067	7.910
Yaw		81178	81204	4.960	0.181	27.403

Total				11.476	0.448	25.616


N	Line	start	Fid range end	ucomp	comp	IR
Pitch		80925	80964	9.160	0.409	22.396
Roll	S360	80973	81014	21.721	0.207	104.932
Yaw		81023	81053	6.885	0.188	36.622

Total				37.766	0.804	46.973


W	Line	start	Fid range end	ucomp	comp	IR
Pitch		81439	81475	8.350	0.252	33.135
Roll	S270	81492	81532	26.340	0.223	118.117
Yaw		81538	81579	2.270	0.110	20.636

Total				36.960	0.585	63.179

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 19

15 juillet 2012

EON 12002

LOGO


EON Geosciences Inc.

FOM Test:	MAG1: Front stinger		Date:	07-May-12
Slot file	mat7.x		Flight:	803

Project:		12002	Location:	St. Honoré
Client:		IAMGOLD	Helicopter	C-GOVD
Pilot:		Stephane Caron	Sensors:	front stinger
Operator		Paul Beaubien	Altitude:	3050m
Processor:		Rick Bailey	Comp:	RMS Comp

Notes: 8 seconds high pass filter used to determine amplitudes.

MAG 1 Results

ucomp

comp

Total

142.972

2.115

67.599


S	Line	start	Fid range end	ucomp	comp	IR
Pitch		81634	81653	5.993	0.395	15.172
Roll	S160	81658	81684	21.761	0.150	145.073
Yaw		81692	81709	8.019	0.081	99.000

Total				35.773	0.626	57.145


E	Line	start	Fid range end	ucomp	comp	IR
Pitch		81509	81536	7.041	0.083	84.831
Roll	S70	81540	81566	20.570	0.304	67.664
Yaw		81570	81595	6.110	0.160	38.188

Total				33.721	0.547	61.647


N	Line	start	Fid range end	ucomp	comp	IR
Pitch		81402	81425	9.935	0.210	47.310
Roll	S340	81431	81454	22.694	0.278	81.633
Yaw		81464	81481	1.797	0.140	12.836

Total				34.426	0.628	54.818


W	Line	start	Fid range end	ucomp	comp	IR
Pitch		81754	81777	13.120	0.105	124.952
Roll	S250	81794	81818	21.616	0.140	154.400
Yaw		81826	81846	4.316	0.069	62.551

Total				39.052	0.314	124.369

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 20

15 juillet 2012

EON 12002

LOGO

A.2. Étalonnage de l’altimètre


C-GOVD May 3rd 2012 EON Geosciences Inc.				Altimeter calibration															Roberval Airport		AntH		179.0 mMSL 2.5 m				Roberval, YRJ, 586’, 179m Aircraft C-GOVD (RMS System)
Units				mMSL		uV		m			m		mMSL		mbar		C		mMSL		mMSL		mMSL		m		Constants and formulaes below are valid under 11000m
Line	fid range			z		rrawAo		raltAo			raltAerr		DTM		PrawBo		TrawBo		bstpBo		brawBo		baltBo		baltBerr		Baro		Constants (sea level)	units
80100		57963.0	58019.0		215.1		199167		33.7	110.5		0.1		178.9		990.4		14.5		195.7		192.1		184.3		-30.8		8314.32	R - Universal Gas Constant	kmol-1
80200		57858.0	57909.0		245.2		382973		63.6	208.8		-0.1		179.1		988.0		14.2		216.5		212.3		204.5		-40.7		273.15	T - Celsius zero in Kelvin	K
80300		57740.0	57792.0		274.6		564180		93.2	305.7		0.1		178.9		983.1		13.9		259.2		253.8		246.1		-28.5		28.96442	M - Molecular Weight of Air	kg*kmol-1
80400		57621.0	57671.0		304.2		743307		122.4	401.5		-0.3		179.3		981.0		13.7		277.6		271.6		263.9		-40.3		9.80665	g - acceleration of gravity	m*s-2
80500		57505.0	57557.0		332.7		921128		151.4	496.7		0.2		178.8		975.8		14.5		323.2		317.1		309.4		-23.3		0.00	H - Datum Height	m
80600		57390.0	57442.0		362.6		1104362		181.3	594.7		0.2		178.8		973.6		13.4		342.5		334.8		327.1		-35.5		1013.25	P - Datum Pressure	mbar
80700		57268.0	57321.0		393.4		1287884		211.2	692.8		-0.7		179.7		969.1		13.3		382.3		373.5		365.8		-27.6		20.00	st - Standard Temperature	Celsius
80800		57154.0	57199.0		423.3		1482051		242.8	796.7		1.0		178.0		965.7		13.5		412.4		403.3		395.6		-27.7
80900		57033.0	57082.0		453.8		1662007		272.2	893.0		-0.1		179.1		962.0		13.7		445.4		435.8		428.1		-25.7
81000		56914.0	56964.0		451.6		1647075		269.7	885.0		-0.4		179.4		962.9		14.2		437.4		428.7		421.0		-30.6
																												Formula for MSL baro altitude from pressure and temperature

		Statistics										*0.0*		179.0												*-31.1*		brawBo= H + (R(TrawBo+T)/Mg)*ln(P/PrawBo)

		Calibrations			raltAo		a		b													baltBo		a		b		Formula for STP baro altitude from pressure and STP temperature
					linest		0.0001630411		182.70													linest		0.9668049		34.05		bstpBo= H + (R(st+T)/Mg)*ln(P/PrawBo)
					used		0.0001630411		1.20													used		1.0000000		-7.73

LOGO

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 21

15 juillet 2012

EON 12002

LOGO

12. Annexe B – Description des champs des bases de données finales

12002 – Lepine, Bousquet-Odyno, Niobec – Quebec, Canada 2012

Final database (June 7th 2012)

EON Geosciences Inc.

Rick Bailey

Notes: -All data were acquired from Astar 350 BA aircraft, registration C-GOVD, (RMS acquisition system).

-Data channels were kept at their original field sampling rates.

-Lags have been applied to raw and processed data channels, unless otherwise specified.

-See processing notes below.

Channel description (1-21):


	Channel Name	Sampling Rate	Units	Description	Comments
1	Line10	10Hz		Line Number
2	Lon	01Hz	deg	Longitude
3	Lat	01Hz	deg	Latitude
4	x	01Hz	m	UTM Easting	WGS-84, Z17N(L,B)/19N(N), Differential GPS
5	y	01Hz	m	UTM Northing	WGS-84, Z17N(L,B)/19N(N), Differential GPS
6	fid10	10Hz	s	Fiducial Time	UTC seconds past midnight
7	hgps	01Hz	HH:MM:SS.SS	Time
8	raltlc	10Hz	m	Radar altitude, edited	AGL, corrected for spikes, noise, adjusted through DTM levelling
9	z	01Hz	m	GPS altitude	MSL, from Differential GPS
10	DTMc	01Hz	m	Digital Topographic Model, edited	Calculated from the difference between z, raltlc and the gps antenna - altimeter offset. MSL
11	baseA	01Hz	nT	Base A TMF	Mag base station, edited
12	m3l	10Hz	nT	TMF	Lag removed
13	mreslc	10Hz	nT	TMF, partial IGRF removed	Partial IGRF to drape surface removed from m3l
14	mreslcb	10Hz	nT	TMF, diurnals corrected	Filtered diurnal signal removed from mreslc
15	mreslvl	10Hz	nT	TMF, levelled	Intersection levelling correction applied on mreslcb
16	mreslvli	10Hz	nT	TMF, levelled, IGRF removed	IGRF removed from mreslvl
17	mreslvld2	10Hz	nT	TMF, micro- levelled	Micro-levelling correction applied on mreslvl
18	mreslvld2i	10Hz	nT	TMF, micro- levelled, IGRF removed	IGRF removed from mreslvld
19	migrfz2	10Hz	nT	IGRF	Applied IGRF Field
20	x_MTM	01Hz	m	MTM Easting	WGS-84, MTM Zone7, Niobec only
21	y_MTM	01Hz	m	MTM Northing	WGS-84, MTM Zone7, Niobec only

Processing Notes:

1.	Base station data were manually edited for cultural interference.

2.	A ‘height correction’ based on IGRF was applied to account for height deviations from drape.

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 22

15 juillet 2012

EON 12002

LOGO

3.	IGRF was removed after levelling.

Corrugation still remains between ties after tie-line levelling. As a result, two passes of micro-levelling were used. Both passes use a variable clip to minimize filtering in areas where intersection levelling is effective. In pass 1, the degree of micro-levelling is limited by altitude deviation from drape, while pass 2 is limited by the relative activity of the block, using the analytic signal of mreslvl. See Table I below for processing parameters.

5.	IGRF is calculated at a fixed average survey height on a fixed date (Table I).

PROCESSING PARAMETERS (Table I):

Block

Grid Filter
Length (m)

Pass 1 –
Deviation from
drape (m)

Clip (nT)

Pass 2 –
Analytic Signal
(nT)

Clip (nT)

IGRF Altitude
(m above MSL)

IGRF Date

Lepine (L)

<-10 or >10

<2.0

342.5

2012/05/04

-6 to 6

2.0 to 3.0

Lin. Interp 7

to 50

-10 to -6 and 6 to 10

Lin interp.

7 to 50

>3.0

Bousquet-Odyno (B)

250

<-10 or >10

<1.0

348.2

2012/05/06

-6 to 6

1.0 to 1.5

Lin. Interp 0

to 25

-10 to -6 and 6 to 10

Lin interp. 5 to 25

>1.5

Niobec (N)

250

<-10 or >10

<2.0

163.0

2012/05/12

-6 to 6

2.0 to 3.0

Lin. Interp 7

to 50

-10 to -6 and 6 to 10

Lin interp. 7 to 50

>3.0

GRIDS (TABLE II):


	Grid Name	Units	Comments
1	12002_L_TMF.grd 12002_B_TMF.grd 12002_N_TMF.grd	nT	Gridded from mreslvld2 channel (Micro-levelled total field magnetic) WGS-84 UTM17N, (B),(L) WGS-84 MTM Zone7 (N)
2	12002_L_RTF.grd 12002_B_RTF.grd 12002_N_RTF.grd	nT	Gridded from mreslvld2i channel (Micro-levelled total field magnetic, IGRF corrected) WGS-84 UTM17N, (B),(L) WGS-84 MTM Zone7 (N)
3	12002_L_FVM.grd 12002_B_FVM.grd 12002_N_FVM.grd	nT/m	First Vertical Derivative of mreslvld2 (Micro-levelled total field magnetic) WGS-84 UTM17N, (B),(L) WGS-84 MTM Zone7 (N)

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 23

15 juillet 2012

EON 12002

LOGO

13. Annexe C – Rapport quotidien

LOGO

EON GEOSCIENCES INC
report (C-GOVD sheet 1/1)

Daily

6500 Transcanadienne, bureau 120, St-Laurent QC, Canada H4T 1X4

Tel: +1-514-341-3366, Cell: +1-514-651-6391, Fax: +1-514-341-5366

info@eongeosciences.com

Aircraft

Projects

Area & Client

Crew chiefs:

Code:

C-GOVD

12002, L

IAMGOLD, Lepine (Abitibi)

Pilots:

Stephane Caron

Type:

ASTAR-350BA

12002, B

IAMGOLD, Bousquet-Odyno (Abitibi)

Engineers:

FBO:

Panorma Helicopters

12002, N

IAMGOLD, Niobec (Saguenay)

Operators:

Paul Beaubien

Inst:

Stinger Mag

Processors:

Gerard Tessier, Khaled Moussaoui, Richard Bailey

Project

12002

Total

Project

C-GOVD Activity Histogram

Aircraft

C-GOVD

BLOCK

Planned Kms

1176.83

344.86

1094.24

2615.93

Total flown Kms

1193.32

344.87

1118.31

2656.50

Set-up (SE)

4.0

Total accepted Kms

1176.90

344.87

1094.24

2616.01

Production (P)

4.0

Total survey hours

11.20

5.10

10.00

26.30

Maintenance (M)

Total test-training hours

1.60

1.00

2.60

Electronics (E)

0.3

Total ferry hours

6.80

1.00

5.30

13.10

Diurnals (D)

Total aircraft hours

19.60

6.10

16.30

42.00

Weather (W)

3.0

Total aircraft days

14.25

Training (TR)

Average kms/day (total)

183.58

Safety (SAF)

Average kms/hour (survey)

105.08

67.62

109.42

99.47

Crew (CR)

Project Completion

100.0%

Other (X)

3.0

Flight information

Aircraft hours

Kilometreage

Daily activity report

Comments

Date

Project
no.

BLK

Flt

Crew (initials)

Ferry

Test
Train

Sur-
vey

Total

Flown

Accepted

Activity Code (per 1/4
days)

1-May-12

AM: Installation of equipment into helicopter in Alma.

12002

mr,pb,sc,rb

PM: Installation and testing of mag base at Rouyn-

Noranda airport.

2-May-12

12002

mr,pb,sc,rb

AM: Equipment Installation continues.

PM: Equipment testing

3-May-12

12002

801

802

mr,pb,sc,rb

pb,sc,rb

0.4

2.8

0.6

1.0

2.8
1.0

AM: Lag test and Radar Altimeter test flown near Roberval.

PM: C-GOVD ferries from Alma to Rouyn-Noranda. FOM flight near Rouyn-Noranda airport. Full crew on site.

4-May-12

12002

001

pb,sc,rb

0.6

AM: Flt001 aborted due to low cloud and rain. Flt002 (lines 1010,-1020; to be re-flown. Drape deviation).

PM: Flt003 (lines 1030-1340). Flt004 (lines 1350-1540).

12002

002

pb,sc,rb

0.5

0.2

0.7

16.42

12002

003

pb,sc,rb

0.5

2.7

3.2

262.72

12002

004

pb,sc,rb

0.5

1.4

1.9

164.20

5-May-12

12002
12002
12002

005
006
007

pb,sc,rb

0.5

2.5

2.4

2.0

3.0

2.9

2.5

246.30

289.98

213.70

246.30

289.98

213.70

AM: Flt005 (lines 1550-1820, lines 1010 & 1020 re- flown). Flt006 (lines 1830-2010, ties 8010-8140)

PM: Flt007 (lines 2020-2360). Lepine Block completed.

6-May-12

12002

008

009

010

pb,sc,rb

0.4

0.3

2.6

1.5

1.0

3.0

1.8

1.3

173.99

116.31

54.57

173.99

116.31

54.57

AM: Flt008 (lines 3010-3660).

PM: Flt009 (lines 3670-3990, ties 7010-7070). Flt010 (lines 4000-4300).

7-May-12

12002

803

pb,sc,rb

3.4

1.0

3.4
1.0

AM: Demobilization

PM: C-GOVD ferries from Rouyn-Noranda to Roberval and from Roberval to St. Honoré. FOM flight near St. Honoré airport.

8-May-12

12002

pb,sc,rb

AM: No flight due to poor weather conditions. Rain and low cloud.

PM: Rain and low cloud continues through afternoon. Full crew on-site.

9-May-12

12002

011

012

pb,sc,rb

0.4

0.2

2.6

1.0

3.0

1.2

272.65

112.30

264.63

104.28

AM: No flight due to rain and low clouds.

PM: Flt011 (lines 1010-1240, ties 8010-8130). Flt012 (lines 1250-1380). Flt012 terminated early by client’s request.

AM: Flt013 terminated early due to rain and low

10-May-12

12002

013

pb,sc,rb

0.4

visibility. No lines flown

PM: No flight due to rain and low visibility.

11-May-12

12002

pb,sc,rb

AM: No flight due to rain and low clouds.

PM: Rain and low cloud continues through afternoon.

12-May-12

12002

pb,sc,rb

AM/PM: No flight due to flying restrictions over weekend.

13-May-12

12002

pb,sc,rb

AM/PM: No flight due to flying restrictions over weekend.

14-May-12

12002

014

pb,sc,rb

0.3

1.5

1.8

168.61

160.58

AM: Flt014 (lines 1570-1770)

12002

015

pb,sc,rb

0.3

2.8

3.1

339.94

PM: Flt015 (lines 1780-2170, ties 8140-8160)

15-May-12

12002

016

pb,sc,rb

0.3

2.1

2.4

224.81

AM: Flt016 (lines 1390-1560, 2180-2240). Re-flight (lines 1141, 1251, 1271, 1291, 1731, 8121, tie 8121)

PM: SURVEY COMPLETED

IAMGOLD Corporation

Levé magnétique héliporté

Blocs Lepine, Bousquet-Odyno et Niobec

page 24

15 juillet 2012

EON 12002