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IAMGOLD reports a new discovery zone at Côté Gold Deposit

IAMGOLD Corporation (TSX: IMG) (“IAMGOLD” or the “Company”) today announced results from the ongoing exploration drilling program on the Côté Gold Joint Venture Project, located 125 km southwest of Timmins and 175 km north of Sudbury, Ontario, Canada. The Côté Gold Project is a 70:30 joint venture between IAMGOLD Corporation and Sumitomo Metal Mining Co. Ltd (SMM Gold Côté Inc.).

The Company is reporting assay results from fourteen diamond drill holes (including the deepening of a historical drill hole totaling 7,452 metres completed as part of its 2017 – 2018 exploration drilling program, which has led to the discovery of intrusive-hosted mineralization referred to as the Gosselin Zone. In addition, the Company is reporting assay results from a drill core re-logging and sampling program of historical drill holes located along a potential south-west extension of this discovery, referred to as the Young-Shannon Zone.

The drilling results confirm the discovery of a new zone of mineralization referred to as the “Gosselin Zone”, located approximately 1.5 km northeast of the Côté Gold Deposit. The Côté Deposit (on a 100% basis) hosts estimated Proven and Probable Mineral Reserves totaling 7.3 million ounces of contained gold and Measured and Indicated Mineral Resources (inclusive of Reserves) totaling 10.0 million ounces of contained gold, and Inferred Mineral Resources totaling 2.4 million ounces of contained gold (see news releases dated November 1, 2018 and February 19, 2019). The Gosselin discovery represents the most significant drill intercepts of continuous gold mineralization so far encountered outside of the Côté Deposit on the joint venture project mineral holdings.

Craig MacDougall, Senior Vice President, Exploration for IAMGOLD, stated: “The Gosselin Zone is a new grass-roots discovery, the result of our ongoing commitment to sustained exploration and an excellent group effort by the Côté Exploration team. With the completion of a positive feasibility study for the Côté Gold deposit in 2018, demonstrating a solid development opportunity with a long mine life and low production costs, this exploration success continues to add to our track record of resource expansion and further enhances the long term value of this exciting development project.”

2017 – 2018 Exploration Program

The 2017 – 2018 exploration drilling program was designed to test the continuity of the new Gosselin zone in a number of directions from the discovery hole (GOS17-05) and to determine if the gold mineralization intersected at depth extendsi to surface. The program included one drill hole executed as a deepening of a pre-existing shallow drill hole from 2015 (CL15-39 EXT). All drill holes from the 2017 – 2018 campaign were collared from land on the north shore of Three Ducks Lake.

The drilling program has confirmed the presence of a wide corridor of gold mineralization with approximate dimensions of 750 metres (strike), 200 metres (width) and 400 metres (depth). Thirteen of the fourteen completed drill holes intersected significant core intervals with elevated gold values (see Table 1 below).

Host lithologies are similar to those which host the Côté Gold Deposit and include: tonalite, diorite, diorite breccia and hydrothermal breccia, all of which are cross-cut by post-mineralization mafic dikes. The intrusive rocks display alteration assemblages dominated by moderate to intense sericite and silica-albite alteration, again similar to that observed at the Côté Deposit.

Sulphide mineralization (pyrite, chalcopyrite, and pyrrhotite) occurs throughout the altered rocks as disseminations, patches, fracture-fillings, veinlets and within the matrix of the hydrothermal breccia. The sulphide assemblage is locally accompanied by molybdenite and rare visible gold. Sulphides are generally more-concentrated in the matrix of the hydrothermal breccia, where chalcopyrite has been observed in abundances from 2 to 3%.

After the initial discovery of the Gosselin Zone, a re-logging and core sampling program of historical drill holes which originally targeted the near-by Young-Shannon high grade vein system to the southwest of the Gosselin Zone was initiated to seek a possible connection to the intrusion hosted mineralization intersected at Gosselin. Historical exploration work carried out on the Young-Shannon property since the late 1920’s and intermittently until the early 2000’s, included extensive diamond drilling (225 drill holes and > 33,300 metres of drilling) and underground exploration comprising a shallow inclined shaft with levels at 30 and 57 metres depth, along with a limited amount (200 metres) of lateral development. The historical work outlined gold values over narrow widths in structurally-controlled quartz-veins within the more mafic phases of granodiorite, and it was concluded by previous owners to be an Archean lode-gold style of mineralization hosted in discontinuous veins.

Recovery and re-examination of core from 33 historical drill holes, totaling 5,453 metres, revealed the presence of wide intervals of unsampled core displaying strong sericite and silica-albite alteration in tonalite and hydrothermal breccia, associated with disseminated sulphide mineralization. The alteration and mineralization was interpreted as favorable for intrusion-hosted gold mineralization similar to Gosselin and the Côté Deposit.

Assay results returned wide intervals of gold mineralization throughout the host rocks, often extending from top to bottom of the shorter drill holes, including drill holes collared proximal to the Gosselin discovery. Of the 33 drill holes re-sampled, a total of 15 returned gold mineralization over core intervals greater than 15 metres in length. The assay results are presented in Table 2 below and assay highlights are provided on the attached map.

Next Steps

The 2019 Phase I exploration diamond drilling program has commenced and entails the completion of 15 planned diamond drill holes (4,500 metres) mainly on Three Ducks Lake. The program is designed to test for the extension of the new Gosselin zone to surface beneath Three Ducks Lake, and to delineate the ultimate size potential of this discovery. The program will also test for continuity between the new Gosselin Zone and the recently discovered intrusion-hosted gold mineralization associated with the Young-Shannon Zone.

As results merit, a second phase of drilling is anticipated to complete an infill drilling program (50 to 75 metres drill hole spacing) to support the completion of an initial NI 43-101 compliant resource estimate in 2020.

About IAMGOLD

IAMGOLD (www.iamgold.com) is a mid-tier mining company with four operating gold mines on three continents. A solid base of strategic assets in North and South America and West Africa is complemented by development and exploration projects and continued assessment of accretive acquisition opportunities. IAMGOLD is in a strong financial position with extensive management and operational expertise.

Entrance to the IAMGOLD Côté Gold Deposit just south of Gogama. PHOTO: LEN GILLIS / Sudbury Mining Solutions JournL 2019.

 

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