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2018 Mineral Reserves and Resources

Mineral resources (“resources”) and mineral reserves (“reserves”) have been estimated as at December 31, 2018 pursuant to Canadian securities regulatory requirements, specifically the requirements of National Instrument 43-101 and the definitions of resources and reserves incorporated therein. Consistent with National Instrument 43-101, resources are divided into “inferred,” “indicated” and “measured” based on the level of geological confidence in the mineralization, and reserves, into “probable” and “proven” upon at least a pre-feasibility study having been undertaken on the indicated and measured resources. Measured and indicated resources are inclusive of proven and probable reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability and are not guaranteed to have economic viability. Inferred resources are too speculative geologically to have any economic considerations applied to them that would allow a translation into reserves.

Cautionary Notes to U.S. Investors

The United States Securities and Exchange Commission (“SEC”) limits disclosure for U.S. reporting purposes to mineral deposits that a company can economically and legally extract or produce. IAMGOLD uses certain terms in the Annual Report, such as “measured,” “indicated,” or “inferred,” which may not be consistent with the reserve definitions established by the SEC. U.S. investors are urged to consider closely the disclosure in the IAMGOLD Annual Reports on Forms 40-F filed with the SEC.

Technical Information and Qualified Person/Quality Control Notes

The mineral resource estimates contained herein have been prepared in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI 43-101”). The “Qualified Person” responsible for the review and approval of all mineral resource and reserve estimates for IAMGOLD contained herein is Lise Chenard, Eng., Director, Mining Geology. Lise has worked in the mining industry for more than 35 years, mainly in operations, project development and consulting. She joined IAMGOLD in April 2013 and acquired her knowledge of the Company’s operations and projects through site visits, information reviews and ongoing communication and oversight of mine site technical service teams or consultants responsible for resource and reserve modeling and estimation.

Gold Mineral Reserves1

100% BASIS


Attributable Reserves

* Mineral reserve tonnage, grade and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding.

Gold Mineral Resources2

(Inclusive of Mineral Reserves)
100% BASIS


Attributable Reserves

1 In mining operations, measured and indicated resources that are not mineral reserves are considered uneconomic at the price used for reserve estimations but are deemed to have a reasonable prospect of economic extraction.

2 Although “measured resources”, “indicated resources” and “inferred resources” are categories of mineralization that are recognized and required to be disclosed under Canadian regulations, the SEC does not recognize them. Disclosure of contained ounces is permitted under Canadian regulations; however, the SEC generally permits resources to be reported only as in place tonnage and grade. See “Cautionary Note to U.S. Investors Regarding Disclosure of Mineral Reserve and Mineral Resource Estimates”.

3 Rosebel, Saramacca, Essakane, Côté Gold, and Boto Gold mineral reserves have been estimated as of December 31, 2018 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2018 using a $1,500/oz gold price and have been estimated in accordance with NI 43-101.

4 Gossey, Monster Lake, Pitangui, and Diakha-Siribaya mineral resources have been estimated as of December 31, 2018 using a $1,500/oz gold price and have been estimated in accordance with NI 43-101.

5 Westwood mineral reserves have been estimated as of December 31, 2018 using a $1,200/oz gold price and mineral resources have been estimated as of December 31, 2018 using a 5.5 g/t gold cut-off over a minimum width of 2.4 metres and have been estimated in accordance with NI 43-101.

6 Mineral reserves at Sadiola have been estimated as of December 31, 2018 using an average of $1,200/oz gold price and mineral resources have been estimated as of December 31, 2018 using a $1,400/oz gold price and have been estimated in accordance with the JORC code.

7 Eastern Borosi mineral resources are disclosed as gold equivalent ounces calculated using the formula: AuEq (g/t) = Au (g/t) + Ag (g/t) / 101.8; and have been estimated as of December 31, 2018 using a $1,500/oz gold price, and a $23/oz silver price and in accordance with NI 43-101. Underground resources are estimating using a cut-off grade of 2.0g/t gold equivalent with a minimum width of 2.4m and open pit resources are estimated using a cut-off grade of 0.42 g/t gold equivalent over a 3.0m minimum width.

8 Due to rounding, numbers presented may not add up precisely to the totals.

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