Iamgold (TSX: IMG; NYSE: IAG) has postponed a planned expansion of its Côté Gold mine in Ontario while it evaluates a significantly larger build that could nearly double the operation's processing rate to 70,000 tonnes per day. The company's shares surged following the announcement.

Just three months ago, Iamgold had signaled that its year-end study would model an expansion from the current 36,000 tonnes per day to between 50,000 and 55,000 tonnes. The company has now pivoted, planning instead to first push the existing plant toward 40,000 tonnes per day. This shift shelves between $500 million and $750 million (C$700 million–C$1 billion) of spending previously tied to the 50,000-tonne option.

The Côté mine, located approximately 500 km north of Toronto, is 70% owned by Iamgold, with Sumitomo Metal Mining (TYO: 5713) holding the remaining 30%.

"We have adjusted the scope of this work to reflect the significant size and opportunity at Côté," CEO Renaud Adams told financial analysts on a second-quarter conference call Friday.

The strategic shift comes amid surging gold prices that have boosted cash flow across the mining sector, giving major producers greater flexibility to fund growth initiatives while simultaneously returning more capital to shareholders. Gold has traded at record levels near and above US$2,500 per ounce in 2024, driven by central-bank purchasing and sustained geopolitical uncertainty. Industry peers Newmont (NYSE: NEM), Agnico Eagle Mines (TSX, NYSE: AEM), and Kinross Gold (TSX: K; NYSE: KGC) each reported stronger second-quarter free cash flow while maintaining broadly intact annual production guidance.

Côté is among Canada's newest large-scale gold mines, having achieved commercial production only two years ago. The mine has become Iamgold's cornerstone operation, revitalizing the company's production profile after years of declining output from its older assets in West Africa and the Americas. Combining Côté with the adjacent Gosselin deposit has opened the door for Iamgold to incorporate a substantially larger resource into its mine plan. However, higher processing rates would necessitate earlier development of Gosselin and demand additional tailings storage capacity. The upcoming year-end study is expected to clarify how aggressively the company intends to pursue that growth.

Toronto-listed Iamgold shares climbed 12% to C$25.25 on Friday afternoon, giving the company a market capitalization of C$14.5 billion ($10.4 billion). The stock has more than doubled over the period, trading in a range between C$9.80 and C$34.09.

Expansion Path

Iamgold intends to release an updated mine plan by year-end that, for the first time, integrates both Côté and Gosselin. Management expects the plan to demonstrate a larger reserve base and extended mine life, while outlining the upgrades required to sustain throughput of approximately 40,000 tonnes per day. The report will separately evaluate larger expansion scenarios.

A 70,000-tonne-per-day scenario would fundamentally alter how the two deposits are mined and would place Côté among the largest gold milling operations in Canada, rivaling the throughput of major open-pit mines operated by Agnico Eagle and Newmont in the country. At 36,000 to 40,000 tonnes per day, Iamgold can continue drawing down Côté for a longer period before shifting heavily into Gosselin, Adams explained. At approximately 70,000 tonnes per day, the company would need to mine both pits much earlier.

The larger expansion would not materially change the company's work plan over the next two to three years. Iamgold intends to open additional areas of the pit, add mining capacity, reduce costs, and increase plant throughput before committing to another major capital project. Management had previously anticipated that the 50,000-tonne expansion would commence around 2029 or 2030.

Côté produced 96,200 oz. of gold in the three months ended June 30 on a 100% basis, with 67,300 oz. attributable to Iamgold. The processing plant handled more than 1 million tonnes in June following the replacement of a conveyor belt and the commissioning of a second cone crusher.

The company expects Côté to produce between 390,000 and 440,000 oz. of gold this year on a 100% basis.

Resource Scale

The March resource update outlined 838 million measured and indicated tonnes grading 0.75 gram gold per tonne, totaling 20.3 million contained ounces across Côté, Gosselin, and the zone connecting them. An additional 177.1 million inferred tonnes graded 0.61 gram per tonne for 3.48 million ounces.

Measured and indicated ounces increased 12% from the year-end estimate, though the rise was not driven by drilling alone. Iamgold raised the gold price assumption used to model the Côté resource to US$2,500 per oz. from US$2,100, and lowered the minimum resource grade threshold to 0.25 gram per tonne from 0.30 gram. The higher price assumption and the consolidation of the deposits into a single model accounted for much of the increase, the company stated.

Gosselin now hosts 310.9 million indicated tonnes grading 0.74 gram gold per tonne for 7.43 million oz., plus 41.4 million inferred tonnes at 0.67 gram per tonne for 890,000 oz. Iamgold expects the year-end work to convert part of that resource into reserves as Gosselin is integrated into the operating plan.

Tailings Requirements

A larger mining operation would necessitate additional waste and tailings storage. Côté's existing tailings facility has a capacity of approximately 233 million tonnes, but incorporating Gosselin will require supplementary capacity, chief operating officer Bruno Lemelin told analysts.

Iamgold is evaluating an expansion of the storage area as well as the possibility of depositing tailings and mine waste in depleted sections of the Côté pit. Management plans to use the coming years to advance environmental studies and permitting while finalizing the larger mine design. Tailings management remains one of the most scrutinized areas of mine development globally, with regulatory and investor pressure intensifying since the 2019 Brumadinho dam disaster in Brazil, making permitting timelines a key variable for any major expansion.

Financial Position

Iamgold enters this decision from a position of strengthened finances. The company ended June with $501 million in cash, no borrowings under its revolving credit facility, and approximately $1.35 billion of available liquidity. Iamgold reported $369 million in mine-site free cash flow during the second quarter.

This financial flexibility provides the company room to enhance the existing Côté operation while deferring its largest expansion expenditure until management determines the optimal scale of the combined Côté-Gosselin mine.

Iamgold posted second-quarter adjusted net earnings of $241.6 million, or 42¢ per share, more than triple the $77.3 million, or 13¢ per share, reported in the same period a year earlier. The company maintained its full-year production target of 720,000 to 820,000 attributable oz. of gold, with all-in sustaining costs of $2,000–$2,150 per oz. including royalties, and total capital spending of approximately $500 million.

Costs have been elevated through the first half of the year. First-half all-in sustaining costs reached $2,195 per oz., above the full-year guidance range. Iamgold anticipates lower costs in the second half as Côté production increases.