Why Canada’s Diamond Mining Sector Is Down to One Mine

Canada took roughly two decades to build itself into a top-five global diamond producer. It may lose that status in fewer.

The Northwest Territories has always been the geographic heart of this story. Three mines built the industry: Ekati, Diavik, and Gahcho Kué. By the time you finish reading this, two of the three have already stopped producing.

This is not an ordinary downturn. Reserve exhaustion, competition from lab-grown stones, and outright financing collapse have converged at once, leaving Canadian diamond mining a very different proposition than it was even two years ago. Here is the map of where the industry actually stands as of September 2026: one mine still running, one promising pipeline project years from a decision, and a sharply contracted global supply picture. By the end, you will know what drove the decline, which assets still matter, and what the structural shift means for natural diamond supply through the rest of the decade.

How Canada built a top-five diamond industry from scratch

Before the 1990s, Canada produced no commercial diamonds at all. That is worth sitting with for a moment, because within a single decade the country would be competing with the largest producers on the planet.

The modern industry has a clear starting gun: the opening of the Ekati mine in 1998. Ekati and Diavik, both in the Northwest Territories, drove the ascent together, and the scale of what that remote corner of the Arctic delivered was remarkable. Two mines carried an entire nation into the global top five.

Here are the three assets that built the industry, and where each stands today:

• Ekati (Northwest Territories): the first Canadian diamond mine, operated most recently by Burgundy Diamond Mines. Now in receivership.
• Diavik (Northwest Territories): operated by Rio Tinto for more than 23 years. Ceased production in March 2026.
• Gahcho Kué (Northwest Territories): a De Beers and Mountain Province Diamonds joint venture. The last major mine still operating.

The peak gives you a reference point. In 2024, Canada was the fourth-largest producer of rough diamonds by both volume and value, turning out 13.3 million carats that accounted for 12% of global volume and 11% of global value.

The scale of the peak: Canada’s 2024 diamond output was valued at approximately $1.47 billion.

Now read that peak against the trajectory. That 13.3 million carats in 2024 marked a 17% fall in volume and a 30% fall in value year-on-year, down from a 2022 benchmark of roughly 16.2 million carats.

Natural Resources Canada diamond facts confirm that the 2024 output of 13.3 million carats represented a sustained multi-year decline, with the government projecting continued downward pressure through subsequent years as mine closures, decreasing ore grades, and lab-grown competition compound simultaneously.

Notice the gap between those two decline figures. Value fell almost twice as fast as volume, which tells you the price of Canadian diamonds was dropping faster than output. The industry was losing ground on two fronts at once: producing less, and earning less for each carat it did produce. You need that baseline to grasp how much production is now being permanently pulled out of the market.

What Arctic diamond mining actually costs to run

Understanding why these mines are so exposed to financial stress means looking at what it costs simply to keep them running. Two structural burdens sit under every Canadian diamond operation, and neither shrinks easily when times get hard.

Logistics on ice: getting supplies to the world’s most remote mines

The Northwest Territories mines sit in genuine isolation. Their heavy-supply lifeline is the Tibbitt-to-Contwoyto winter road, an ice road built across frozen lakes each year to haul in the bulk cargo the mines cannot survive without: fuel and heavy equipment above all.

The road only exists while the ice holds, which historically meant a usable season of a few short weeks in the depths of winter. That window is the problem. Climate change is warming the region and shortening the season, reducing the road’s reliability and raising the risk that a mine cannot get enough fuel and equipment in before the ice softens.

Beyond the ice road window, permafrost infrastructure challenges affect foundation stability, tailings containment, and year-round operational reliability across Arctic mines, adding a layer of capital expenditure risk that does not appear in resource estimates calculated at more temperate latitudes.

For you as an analyst, that is a cost premium baked into the geography itself, and a rising one.

Indigenous consultation as a structural operating requirement

The second burden is not a logistical one but a legal and social one, and it is a defining feature of building anything in the Northwest Territories rather than a discretionary box to tick.

Indigenous consultation shapes project design, permitting, and social licence from the outset. The frameworks fall into four broad types:

• Land Claims: The Tłı̨chǫ Land Claims and Self-Government Agreement applies directly to the Ekati and Diavik sites, influencing waste management permitting and mitigation.
• Impact and Benefit Agreements (IBAs): Agreements guaranteeing training, employment, and business opportunities for Indigenous and northern residents. A new mine cannot proceed without them.
• Environmental Monitoring Programs: Legally binding agreements that create independent oversight bodies embedding Indigenous communities in environmental decisions.
• Post-Closure Stewardship: Obligations that continue long after the ore runs out.

De Beers’ Ní Hadi Xa programme, established in 2014, is a live example of the third category, placing Indigenous communities directly inside the environmental and traditional-knowledge oversight of Gahcho Kué. The post-closure category is just as concrete: Rio Tinto signed a closure agreement with the Tłı̨chǫ Government in February 2026 and another with the Kitikmeot Inuit Association in September 2026, both for a mine that had already stopped producing.

Put the two burdens together and the picture sharpens. A climate-threatened ice road and non-negotiable stewardship obligations that outlast production mean the cost base does not fall in step with output. That is precisely why Canadian Arctic mines can tip into distress before their reserves are exhausted, and why any project that looks viable on a resource estimate may not survive softer diamond prices in the real operating environment.

Ekati, Diavik, and Gahcho Kué: three mines, three very different endings

Take the three mines in sequence and a single conclusion becomes unavoidable. The industry has contracted to one operating mine, and that mine is already planning its own end.

Start with Diavik. Operated by Rio Tinto, it delivered its final production on 26 March 2026, ending more than 23 years of operations after its economic reserves ran out. Over its life it produced more than 150 million carats, predominantly white gem-quality rough. Its closure alone removes an estimated 3 to 4 million carats annually from global output, and there is nothing cyclical about it. The ore is gone.

The Diavik closure removed more than Rio Tinto’s largest single diamond asset from global supply; it also ended the logistical and processing infrastructure that underpinned the broader Northwest Territories industry cluster, infrastructure that a future project could not quickly rebuild.

Then there is Ekati, and this is the instructive case. Burgundy Diamond Mines held 100% ownership through Arctic Canadian Diamond Company when the operation collapsed, not for want of ore but for want of money. Production had been slipping, and by Q1 2026 it had fallen to just 380,000 carats, with only 230,000 carats sold.

The collapse in numbers: Ekati’s Q1 2026 output of 380,000 carats marked a 53% year-on-year decline.

The parent company entered creditor protection after running out of funds. When a court-supervised sale process failed, the Northwest Territories government appointed PricewaterhouseCoopers (PwC) as receiver in July 2026 to wind down and clean up the site, ending Ekati’s 27-year run.

Ekati is the lesson worth internalising: geological viability and financial viability are separate questions. A mine can have ore in the ground and still close if the price environment and capital structure cannot carry it through to extraction.

That leaves Gahcho Kué, and here the news is genuinely strong for now. The De Beers and Mountain Province Diamonds joint venture recovered roughly 4.66 to 4.7 million carats (100% basis) in FY 2024 at an average grade of 1.28 carats per tonne, beating its guidance. A 2024 life-of-mine update estimates 36.3 million carats recoverable between 2024 and 2031.

But anchor your expectations in that end date. Gahcho Kué is preparing for its own end-of-life in the early 2030s.

The picture as of September 2026 is a single-mine industry counting down to its own closure. Any narrative of Canada as a multi-mine producing nation is now out of date.

Is there a next generation of Canadian diamond mines?

If Gahcho Kué is the present, the Star-Orion South Diamond Project in Saskatchewan is the most credible version of the future. On paper, it has real merit.

Star Diamond Corporation owns the project outright, at 100%, and it has already cleared two milestones that matter a great deal. It holds federal environmental approval granted in 2014 and provincial approval granted in 2018, which removes some of the regulatory uncertainty that sinks earlier-stage projects.

The resource picture strengthened too. A revised estimate on 24 July 2024 lifted the numbers meaningfully:

• Star Kimberlite: indicated resources up 22% to 34.8 million carats, at a grade of 19.4 carats per hundred tonnes (cpht).
• Orion South Kimberlite: indicated resources up 37% to 36.9 million carats, at a grade of 17.9 cpht.

That is where the optimism has to meet the calendar. A resource estimate is only one gate among several, and Star-Orion South still has to pass through the rest in sequence:

1. Updated resource estimate (completed July 2024)
2. Pre-Feasibility Study (currently in preparation)
3. Full Feasibility Study (targeted late 2026 to Q4 2027)
4. Project financing secured
5. Permitting and community support maintained
6. Construction (3 to 5 years after positive studies)
7. First production

Read down that list and the timeline speaks for itself. Even if every gate opens on schedule, first production sits well into the 2030s, and construction only begins once financing, regulatory support, and improved diamond market conditions all line up, none of which any single company controls.

The honest conclusion is that Star-Orion South cannot replace the combined output of Diavik and Ekati in the timeframe that matters for today’s supply gap. The Canadian pipeline is thin and constrained, and the hole left by two closures in 2026 will not be filled domestically for at least a decade, if it is filled at all.

What a shrinking Canadian supply base means for global diamond markets

Step back from the individual mines and the picture becomes a supply-side story with global reach. The Canadian decline is not an isolated corporate saga; it is a structural input into how natural diamond prices and lab-grown competition play out through the rest of the decade.

The contraction is measurable. Industry forecasts suggest Canadian output could fall from the recent range of 13 to 16 million carats to roughly 8 to 10 million carats by 2028, a meaningful removal of rough supply from the global market.

Ordinarily, falling supply supports prices. This time, something is capping that effect.

The market pressure in one figure: Polished natural diamond prices have fallen roughly 40% in recent years.

That decline is driven in large part by lab-grown diamonds, which sell at a persistent discount and keep taking market share. Their presence structurally limits how far natural prices can recover, and the pressure lands hardest on standard-quality stones from high-cost Arctic operations, exactly the kind Canada produces.

The lab-grown diamond economics at work here follow a consistent pattern: synthetic stones enter markets at steep discounts, capture share in the standard-quality segment first, and structurally limit how far natural prices can recover even when mined supply contracts sharply.

For anyone holding Canadian diamond exposure, the risks cluster into four categories:

• Finite asset lives: With Diavik closed and Ekati in receivership, the sector leans on ageing infrastructure and depleting reserves.
• Financial and leverage risk: Ekati’s receivership is a live demonstration that financing failures can shut a mine even with ore remaining.
• Valuation and market sensitivity: Analysts rate remaining pure-play miner Mountain Province Diamonds as “High” risk, citing sensitivity to natural diamond prices, capital cost overruns, and USD/CAD exchange rate moves.
• Structural substitution: Lab-grown competition caps the upside that a supply squeeze would normally deliver.

Here is the paradox to hold onto. Supply is falling, which should push prices up, yet lab-grown substitution is smothering that recovery. That combination is the central question for whether the next generation of high-cost Canadian projects can ever be investable.

What remains, what has closed, and where the industry goes from here

As of September 2026, the state of Canadian diamond mining fits into a single sentence: one major operating mine in Gahcho Kué, one advanced pipeline project in Star-Orion South with a multi-year path to a decision, and a production trajectory pointing downward through the early 2030s.

What that means depends on where you sit. If you track global rough diamond supply, Canada’s contraction is a genuine structural input, subtracting several million carats a year from a market already reshaping around lab-grown competition. If you hold exposure to Canadian miners, the Ekati receivership is the clearest illustration of sector risk you are likely to find: ore in the ground is no guarantee a mine survives.

The Canadian diamond industry rose in two decades and is contracting in fewer, with the ground half-full and the economics running out first.

Star-Orion South remains the best remaining prospect, but its timeline, financing needs, and dependence on market conditions make it a decade-long question, not a near-term answer.

Arctic mineral extraction faces a consistent set of capital and regulatory challenges regardless of commodity, and the pattern visible in Canadian diamond mining, where operating costs outpace revenue before reserves run out, appears in other high-latitude projects where remoteness, climate, and Indigenous consultation overlap.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and financial projections are subject to market conditions and various risk factors.