Where Chalice Mining’s Gonneville Project Actually Stands

Chalice Mining found what may be the Western world’s largest palladium-nickel-copper deposit back in March 2020. Six years on, the mine is still not built.

The reasons why illuminate everything a mining investor needs to understand about the gap between a world-class discovery and a world-class operation. The Gonneville project sits 70 kilometres north-east of Perth on company-owned farmland in the Julimar Complex, and its scale is exceptional: a 23-year open-pit mine plan, projected annual output of 220,000 ounces of palladium, platinum, and gold, alongside meaningful nickel, copper, and cobalt. If it reaches construction, it will be Australia’s first primary platinum group metals mine and its second-largest nickel mine. The path there runs through a bankable feasibility study, a critical pilot-plant run, a multi-year environmental approvals process, and the assembly of $820-840 million in pre-production capital.

This piece gives you a precise picture of where Gonneville actually stands right now, what the next 18 months of milestones look like, and which risks deserve the most scrutiny before the targeted 2028 Final Investment Decision. Treat it as a navigational map through the project’s current state, not a promotional summary.

From discovery to drill-out: what six years of technical work has built

Every mining project starts with a single hole in the ground. Gonneville’s came in March 2020, and what followed was one of the more intensive drill-out campaigns the Australian market has seen this decade.

Chalice has since completed more than 1,200 drill holes, totalling roughly 320,000 metres of drilling. That is an unusual amount of geological work for a project still years away from a construction decision, and it tells you something important: the company has spent heavily to understand exactly what sits beneath the farmland before committing to build anything on top of it.

Total investment since discovery has reached approximately $250 million. That figure is not just a cost. It is a measure of how much technical uncertainty has already been resolved.

The result is a fully drilled, resource-defined asset supporting a 23-year open-pit mine plan. Projected average annual production breaks down across several metals:

• Approximately 220,000 ounces of 3E precious metals (palladium, platinum, and gold combined)
• 7,000 tonnes of nickel
• 8,000 tonnes of copper
• 700 tonnes of cobalt

This is a genuinely multi-commodity deposit, which shapes both its economics and its risk profile in ways a single-metal mine never faces.

Gonneville is positioned as the largest palladium-nickel-copper resource in the Western world.

Here is why that matters for how you weigh the risks. Geological uncertainty, whether the ore body is real, how large it is, and what grade it carries, is usually the single biggest risk at this stage of a mining project. The scale of drilling and capital already deployed has substantially retired that risk. What remains sits in engineering, permitting, and financing, not in whether the deposit exists.

What Gonneville actually is, and why platinum group metals are different from other mining projects

Most investors have a rough feel for gold and copper. Far fewer know what platinum group metals actually do, and that gap matters here, because the nature of PGMs explains why this project takes longer to develop than a standard base-metal mine.

Palladium, platinum, and gold are grouped together at Gonneville as “3E” precious metals, meaning the three elements are counted together in the production figures. Palladium is the headline metal. Its largest end-use is in catalytic converters, the devices that reduce harmful emissions from petrol engines. Global supply is heavily concentrated: according to Chalice, roughly 90% of the world’s palladium comes from aging Russian and South African operations.

That concentration is the strategic heart of the project. A new primary PGM mine in a stable Western jurisdiction is rare, which is precisely why it draws interest from governments and export credit agencies later in the story.

A distinction worth holding onto: Gonneville is a PGM-primary project, not a nickel or copper mine that happens to produce a little palladium as a by-product. Palladium and its precious-metal companions drive the revenue, and the base metals come along with them. That flips the usual economics of an Australian resource project and changes how it gets financed and how it is perceived by the community around it.

The table below shows how the primary metal sits alongside the base-metal by-products.

For context, palladium currently trades around US$1,300-1,400 per ounce, while Chalice estimates roughly US$2,500 per ounce is needed to incentivise genuinely new supply. That gap is central to the risk picture later.

Why metallurgical complexity drives the pilot-plant requirement

Pulling six different metals out of a single ore stream is not simple. Palladium, platinum, gold, nickel, copper, and cobalt each require a validated, project-specific processing recipe, known in the industry as a flowsheet, that reliably separates them at commercial recovery rates.

Lenders will not commit hundreds of millions of dollars on the strength of laboratory modelling alone. They want independent proof that the flowsheet performs as designed under continuous, real-world operating conditions.

PGM processing and recovery at multi-metal deposits like Gonneville involves a sequence of flotation, leaching, and smelting steps that must be optimised for each ore’s specific mineralogy; even small improvements in recovery rates across six metals compound materially into the life-of-mine economics that lenders use to model debt serviceability.

That proof is the 8-week continuous pilot plant run scheduled for the second half of 2026. It is the specific technical gate that unlocks the rest of the financing conversation, which is why it sits at the centre of the timeline that follows.

The feasibility and approvals race: what has to happen before 2028

Getting to a Final Investment Decision is not one gate. It is two independent timelines, one technical and one regulatory, that must both arrive at the same point at roughly the same time.

On the technical side, Chalice completed its Pre-Feasibility Study (PFS) in December 2025 and moved straight into the Bankable Feasibility Study (FS), the detailed engineering and costing document lenders require. As of September 2026, management is targeting FS completion in Q3 2027. Feeding into that work is the pilot plant run, which draws its representative ore from an 11-hole metallurgical diamond-drilling campaign completed in April 2026.

On the regulatory side, the sequencing is longer and less within the company’s control. The Western Australian Environmental Protection Authority determined in April 2024 that it would formally assess the project at the Public Environmental Review level, and the proposal was designated a controlled action federally. A Proponent-prepared Environmental Scoping Document was approved on 12 November 2024, and Chalice is now preparing its Environmental Review Documents (ERDs) for submission in Q4 2026.

After submission, the ERDs face an 8-week public comment period, followed by an approvals process expected to run roughly three years from submission, pointing toward a ministerial decision around 2028.

Australia’s mining approval reforms in 2026 have introduced faster assessment pathways for projects designated as controlled actions, but Gonneville’s ERD process predates many of those changes, meaning the project is navigating an approvals track that sits between the old framework and the new one.

The chronological milestone sequence looks like this:

1. Pilot plant run, 8 weeks continuous (H2 2026)
2. ERD submission (Q4 2026)
3. Feasibility Study completion (Q3 2027)
4. Public comment period (following ERD submission)
5. Final Investment Decision target (H1 2028)
6. First production (around 2030)

An external check adds some confidence to the regulatory track.

An independent review by former WA EPA Chair Dr Tom Hatton, completed in August 2026, confirmed that Chalice has appropriately identified the project’s environmental risks and that its mitigation measures support the targeted H1 2028 FID timeline.

Reaching a bankable FS with approvals secured is estimated to require a further $25 million on top of the $250 million already spent.

Here is what this means for you as an investor. The 2028 FID is not a single event you can wait for; it is a chain of dependent milestones, and any slippage on either track pushes the timeline out without necessarily signalling that the project has failed. The observable signals to watch through 2026 and 2027 are the pilot-plant results, the ERD submission, FS completion, and the public comment outcome.

Assembling $840 million: the capital structure and who Chalice is talking to

A completed feasibility study and a validated flowsheet still leave the hardest question unanswered: where does $820-840 million in pre-production capital come from for a company that has never earned a dollar of mine revenue?

Chalice’s answer is a two-stage structure built around export credit agencies (ECAs), which are government-backed institutions that provide long-dated, low-cost debt to support strategically important projects. The plan targets 60-70% of total capital as ECA-backed debt, led by Export Finance Australia through its Critical Minerals Facility. Supporting agencies are expected from Canada, Finland, Germany, Japan, and Korea, all nations with significant nickel and copper processing infrastructure.

The concentration of global palladium supply in Russia and South Africa is exactly why this approach is realistic rather than wishful. Western governments have a strategic interest in new, secure sources of critical minerals, and Gonneville fits that policy objective precisely.

The remaining capital is expected to come from prepayment or streaming arrangements, and this is where a crucial caveat applies. As of 21 September 2026, no binding streaming agreement, royalty deal, or executed ECA facility term sheet has been publicly disclosed. Chalice reports strong interest from lenders and streaming companies, but interest is not commitment.

The table below sets out the financing mix and its current status.

The single most important thing to hold in mind is the gap between “strong interest” and “executed term sheet.” Strong interest is entirely normal at this stage for a project of this quality. It is not the same as capital in the bank, and closing that gap depends on the very milestones tracked in the previous section: a completed FS, a validated pilot plant, and binding offtake agreements.

Critical minerals financing at the scale Gonneville requires sits at the intersection of project-specific risk and broader institutional gaps in how Western capital markets price long-dated, pre-revenue mining assets, a structural problem that affects every project competing for ECA debt and streaming capital in the current cycle.

Why an interim streaming deal matters before construction financing closes

A streaming agreement is an upfront cash payment made in exchange for the right to buy a portion of a mine’s future metal output at a pre-agreed, usually discounted, price. It is a way to raise money without selling shares.

Chalice is exploring an interim streaming transaction to access this kind of non-dilutive capital during the stretch between now and when the ECA debt closes. The alternative, a large equity raise, would dilute existing shareholders, so avoiding it protects the value of a current holding.

The discussions focus primarily on gold and by-product metals. That is a deliberate choice, because it preserves the core palladium and nickel revenue stream that drives the project’s headline economics.

The risks that matter most: palladium prices, permitting delays, and the financing gap

Three risks stand between Gonneville and a mine, and they differ in how much control anyone actually has over them. Understanding which is which tells you what to monitor and how.

Palladium price risk sits largely outside anyone’s control, and it is the most material. Palladium accounts for roughly 50% of forecast revenue, and there is a genuine, unresolved disagreement about where the price is heading:

• Institutional forecasters Nornickel and the World Platinum Investment Council project the palladium market swinging into surplus, with roughly 200,000 ounces of oversupply emerging in 2027, driven by increased recycling and normalised mine supply.
• Chalice counters that structural supply is tightly constrained, pointing to the 90% dependence on aging Russian and South African operations, and argues current prices sit well below the level needed to bring on new production.

The palladium surplus projections from Nornickel and other institutional forecasters reflect a specific reading of recycling rates and mine supply normalisation that Chalice’s management disputes on structural grounds, pointing to how tightly the supply base remains tied to aging, geopolitically exposed operations.

Chalice estimates roughly US$2,500 per ounce is required to incentivise new palladium supply, against a current spot price of approximately US$1,300-1,400 per ounce.

This is a real debate, not one side being obviously right. What it means for you is direct: with palladium at half of projected revenue, a price sustained at or below US$1,300 materially weakens the economics at exactly the moment Chalice needs lenders and streaming partners to model those numbers into binding commitments.

Permitting and social-licence risk

The second risk is partly within Chalice’s influence but not fully. Because Gonneville sits close to populated areas rather than in a remote desert, environmental and social-licence risks are higher than for typical Australian mines.

Concerns raised through the ERD process include water usage, power supply, dust, noise, and biodiversity offsets. Chalice has engagement underway with Traditional Owners, regulators, and the local community, but the outcome of the approvals process is not guaranteed, and delay here is the central schedule risk. This one becomes visible through the ERD submission and public comment outcomes in 2026 and 2027.

The third risk, financing execution, is the most within management’s hands. Assembling $820-840 million as a pre-revenue, single-asset company is a substantial hurdle, and independent analysts caution that the project is highly leveraged to macroeconomic conditions such as interest rates and currently lacks a committed cornerstone partner. Progress on this front is disclosed through ASX announcements.

How base metal by-products change the risk picture

The base metals cut both ways. Nickel faces a near-term headwind, with Nornickel projecting the market surplus widening to roughly 55,000 tonnes in 2027 as Indonesian supply ramps up, while copper and cobalt benefit from electrification and data-centre demand.

That mix gives you diversification, no single metal completely determines whether the project works, but it also adds complexity, since more revenue streams mean more moving parts in the economics.

What the 2028 FID decision will actually depend on

Pull the five layers together and the shape of the decision becomes clear. Gonneville’s Final Investment Decision, targeted for H1 2028, depends on three parallel tracks all converging within a tight window.

The technical track requires the pilot plant to validate the flowsheet and the Feasibility Study to complete by Q3 2027. The regulatory track requires the ERD submission in Q4 2026 to move successfully through public comment to a ministerial decision around 2028. The financing track requires ECA debt and streaming arrangements to convert from discussion into executed agreements.

The useful distinction for you is between what Chalice controls and what it does not. The pilot plant, FS completion, and ERD submission are within the company’s hands. The rest depend on outside parties:

• The ministerial environmental decision
• ECA credit approval and term sheets
• Binding offtake agreements
• Execution of a streaming deal

From discovery in 2020 to the targeted FID, roughly eight years will have passed, at a total pre-FID cost near $275 million (the $250 million spent plus the $25 million remaining), with first production targeted around 2030.

Gonneville is genuinely one of the more significant critical minerals projects in Australia’s development pipeline: technically de-risked, strategically positioned against a supply base concentrated in geopolitically exposed jurisdictions, and following a credible pathway. Whether it becomes a mine rests on commodity prices, regulatory outcomes, and financing conditions all aligning within that narrow window. The pilot-plant results, ERD submission, and FS progress through 2026 and 2027 are your leading indicators for whether the 2028 timeline holds.

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. Financial projections and forward-looking targets are subject to market conditions and various risk factors, and remain speculative until confirmed.