Perpetua Resources Secures $2.9 Billion EXIM Loan for Stibnite Gold Project

When Private Capital Falls Short: The Architecture of State-Backed Mineral Finance

There is a class of industrial asset that private capital markets consistently undervalue until geopolitical reality forces a revaluation. Domestic critical mineral deposits sit squarely in this category. For decades, the economics of mining projects in high-cost, highly regulated jurisdictions like the United States struggled to compete against cheaper offshore supply chains. The result was a systematic hollowing out of domestic mineral production capacity, with the strategic consequences now becoming impossible to ignore.

The Perpetua Resources EXIM loan for the Stibnite Gold Project represents something more than a single financing transaction. It reflects a fundamental shift in how the U.S. government conceptualises the relationship between industrial policy, national security, and resource sovereignty. Understanding what this loan is, how it was structured, and why it matters requires examining both the mechanics of the deal and the broader forces driving it.

What EXIM's Make More in America Initiative Actually Does

The Export-Import Bank of the United States was historically associated with a narrow mandate: providing financing to support American exports, helping U.S. companies compete for contracts in foreign markets. The Make More in America Initiative (MMIA) represents a meaningful expansion of that role, pivoting EXIM's toolkit toward financing domestic manufacturing and production capacity.

This is a structurally significant departure. Traditional export credit agencies do not generally finance domestic infrastructure. The decision to apply EXIM's financing mechanisms to a domestic mining project signals that policymakers have concluded that conventional capital markets alone cannot adequately fund the development of strategically critical domestic mineral assets.

Furthermore, the broader US critical minerals strategy has increasingly recognised that market forces alone will not deliver the supply chain resilience that national security demands.

The Stibnite approval illustrates how EXIM's mandate has been reframed from facilitating trade to actively building the domestic industrial base for materials that underpin defence and industrial supply chains.

The MMIA framework is designed to bridge the gap between what private capital will finance and what national interest requires to be built. For projects like Stibnite, where the strategic rationale extends well beyond commercial returns, this gap has historically been prohibitive.

Breaking Down the $2.9 Billion Loan Structure

The Perpetua Resources EXIM loan for the Stibnite Gold Project is the largest EXIM financing commitment directed at a single domestic mining project in the bank's history. Its structure reflects both the scale of the undertaking and the complexity of securing long-tenure project finance for a greenfield mining operation.

The interest rate mechanism is worth understanding in detail. By anchoring the rate to the long-term U.S. Treasury bond rate plus 100 basis points, the structure offers Perpetua a degree of cost certainty that commercial project finance rarely provides. The rate is fixed at the point of first drawdown, insulating the project from subsequent Treasury rate movements during the construction and early operational phases.

How the Engagement With EXIM Evolved

The path from initial interest to board approval spanned multiple years and several escalating commitments. This strategic antimony loan process demonstrates how large-scale government financing engagements are built incrementally over time:

1. 2024: EXIM issued a non-binding Letter of Interest for up to $1.8 billion, signalling preliminary appetite for the project.

2. May 2025: Perpetua submitted a formal application for up to $2 billion, supported by updated employment projections and an expanded project scope.

3. September 2025: EXIM issued a Preliminary Project Letter and indicative term sheet, with final board consideration flagged for spring 2026.

4. Pre-Approval: EXIM advanced a proposed $2.7 billion package to the mandatory 25-day congressional notice period, the final procedural step before a board vote.

5. May 2026: The EXIM Board approved the full $2.9 billion senior secured facility following completion of the congressional notice requirement.

The incremental growth in the loan quantum from $1.8 billion at the LOI stage to $2.9 billion at approval reflects the deepening due diligence process, updated capital cost estimates, and the incorporation of capitalised interest and fees into the total facility.

The Stibnite Mining District: Geography, History, and Strategic Potential

The Stibnite Mining District in central Idaho carries a layered history. The area was actively mined during World War II, primarily for antimony and tungsten, materials critical to the wartime industrial effort. Decades of prior industrial activity left behind environmental liabilities that any responsible redevelopment plan must directly address.

Perpetua's project framework treats ecological remediation not as a peripheral compliance obligation but as a core component of the development thesis. This includes addressing legacy contamination and restoring ecological function to waterways affected by historical mining operations. The redevelopment is structured around the concept of responsible reactivation, simultaneously extracting economic value and reversing prior environmental degradation.

Idaho's geography also matters from a logistics and infrastructure perspective. The state's existing mining services ecosystem, combined with access to regional power infrastructure, supports the operational feasibility of a large-scale mining operation at this location.

Antimony: The Strategic Mineral That Makes This Project Different

Gold will drive the majority of revenue at Stibnite. However, antimony is the reason the U.S. government deployed nearly $3 billion in state finance to build it. The growing concerns around antimony supply risks have been central to the policy justification for this unprecedented level of public financing.

Understanding Antimony's Dual-Use Profile

Antimony is not a household name in commodity markets, but its applications span both industrial and defence sectors in ways that make its supply security genuinely consequential. The wide range of antimony defence applications explains why this mineral has attracted such significant policy attention:

• Flame retardants: Antimony trioxide is a synergist used in flame retardant formulations across construction, electronics, and textiles industries.
• Lead-acid batteries: Antimony strengthens lead alloys in conventional battery grids.
• Defence applications: Antimony compounds are used in armour-piercing ammunition, night vision equipment, infrared sensors, and various munitions components.
• Semiconductors: Emerging applications include use in certain semiconductor compounds.

The defence applications are particularly sensitive because they involve materials embedded in weapons systems and surveillance technologies where supply chain disruption carries direct operational risk.

The China Concentration Problem

China currently dominates global antimony production and processing, accounting for the substantial majority of world supply. This concentration creates a single-point-of-failure risk in the defence supply chain that U.S. policymakers have been increasingly vocal about addressing.

The strategic logic is straightforward: a nation that controls the processing of materials embedded in another country's weapons systems holds a form of leverage that extends well beyond conventional trade competition.

Stibnite's significance in this context is amplified by a stark reality: it is currently identified as the only domestic U.S. reserve of antimony. There is no comparable project in the development pipeline that offers a near-term alternative.

Gold Versus Antimony: A Strategic Comparison

This asymmetry explains why a project with gold as its primary revenue commodity attracted state financing at a scale that would be unusual for a gold-only development. The antimony component transforms Stibnite from a commercial mining project into a national security asset.

The Full Capital Stack: How the Financing Pieces Fit Together

The EXIM loan does not stand alone. It completes a capital structure assembled over several years:

• October 2025: Perpetua closed a $255 million private placement equity round with participation from Agnico Eagle Mines and JPMorganChase.

• May 2026: The $2.9 billion EXIM senior secured loan was approved, with availability expected in the second half of 2026.

• Combined with existing cash reserves, the total financing package is designed to fully fund construction through to first production.

The identity of the equity investors matters as much as the quantum. Agnico Eagle Mines is one of the world's largest gold producers by market capitalisation, with a track record of operating complex mining projects across multiple jurisdictions. Its willingness to commit equity capital signals a credible independent assessment of the project's technical and commercial merits. JPMorganChase's participation adds institutional credibility from the financial sector.

Strategic equity participation from one of the world's leading gold producers carries significant weight in any technical due diligence assessment, providing validation that extends beyond the government financing dimension.

Endeavour Financial is acting as financial advisor for the EXIM loan transaction, with Hunton Andrews Kurth providing legal counsel.

EXIM's Due Diligence Framework: Four Pillars of Evaluation

The approval of the Perpetua Resources EXIM loan followed one of the most comprehensive project finance evaluations conducted under the MMIA framework. EXIM's assessment covered four distinct dimensions:

1. Technical Assessment: Engineering feasibility, mine design, processing methodology, and production projections were independently evaluated to validate the technical basis for capital cost estimates.

2. Financial Assessment: Project economics, debt serviceability modelling under various commodity price scenarios, and capital cost validation were stress-tested against benchmark assumptions.

3. Environmental Assessment: Compliance with U.S. environmental standards, the scope and credibility of remediation commitments, and ecological impact assessments were reviewed in detail.

4. Social Assessment: Community engagement processes, employment projections, Indigenous and local stakeholder considerations, and regional economic contributions were all subject to scrutiny.

The mandatory 25-day congressional notice period adds a layer of democratic oversight to the process. This transparency mechanism requires that elected representatives have the opportunity to review and respond to major EXIM commitments before they are finalised, providing a governance check on the deployment of public finance.

Economic and Employment Contributions at the Project Scale

The Stibnite Gold Project is projected to sustain an average of more than 700 direct jobs annually throughout its operational life. In the context of rural Idaho's economy, this represents a substantial employment anchor with meaningful multiplier effects through local supply chains and service sectors.

Beyond direct employment, the project carries significant implications for:

• State and local tax revenues flowing to Idaho communities throughout the mine life
• Contractor and supplier employment in adjacent sectors including engineering, logistics, and equipment maintenance
• Regional economic activity generated by workforce spending and infrastructure investment

The employment and fiscal contribution projections formed part of the formal case presented to Congress during the notice period, providing elected representatives with a concrete basis for assessing the project's community-level impact alongside its strategic rationale.

Benchmarking the Stibnite Loan Against Other U.S. Critical Mineral Finance

EXIM's structural role differs meaningfully from the Department of Energy's loan programs or the Development Finance Corporation's investment mandates. EXIM operates as a senior secured lender at project finance scale, with loan terms calibrated to Treasury benchmarks rather than concessional rates.

This makes the Stibnite facility structurally closer to commercial project finance than to a grant or subsidy, while still providing access to capital at a cost and tenure that private markets would not replicate for an equivalent project. The critical minerals production push underpinning this approach reflects a broader legislative and executive commitment to rebuilding domestic supply chains.

Risks, Conditions, and What Still Needs to Happen

Board approval does not mean unconditional funding. The Perpetua Resources EXIM loan for the Stibnite Gold Project remains subject to several conditions that must be satisfied before funds are drawn.

Investors and observers should note that all earlier EXIM instruments, including the Letter of Interest, Preliminary Project Letter, and congressional notice, were non-binding. While board approval represents a qualitatively different milestone, loan availability in the second half of 2026 remains contingent on completion of final documentation and customary conditions precedent.

Key risk factors to monitor include:

• Final documentation completion: Legal, financial, and technical documentation must be finalised before the facility becomes available.
• Regulatory and permitting timelines: Construction cannot commence until all necessary permits are in place. Any delays in the permitting pathway extend the pre-production period and affect the overall project timeline.
• Commodity price sensitivity: The project's debt serviceability is modelled against assumed gold and antimony price scenarios. Sustained weakness in either commodity would affect coverage ratios.
• Interest rate exposure at drawdown: While the rate is fixed at initial drawdown, the absolute level of that rate depends on Treasury yields at the time, introducing some residual uncertainty in total debt cost.

The Precedent This Sets for U.S. Mining Policy

The Stibnite financing model is likely to be studied carefully by project developers across the domestic critical minerals landscape. Several features make it potentially replicable:

• The combination of a strategic mineral with genuine national security implications and a primary revenue commodity that supports project economics
• Environmental remediation obligations that align with the government's interest in responsible domestic redevelopment
• A multi-year engagement pathway with EXIM that allowed the project case to be built incrementally
• Strategic equity participation from institutional investors that provided independent validation of commercial viability

For junior and mid-tier miners advancing domestic critical mineral projects, the Stibnite template offers a potential roadmap: identify the strategic mineral thesis, demonstrate environmental responsibility, build a credible capital stack with institutional equity, and engage government financing mechanisms early enough to allow the due diligence process to run its full course.

The broader parallel with legislative frameworks like the Inflation Reduction Act and the CHIPS Act is instructive. Each of these represented a deliberate decision to deploy public finance in domains where private capital markets were systematically underinvesting relative to national interest requirements. The board's approval announcement extends this logic to hard-rock domestic mining in a way that may define the template for future government-backed mineral project finance in the United States.

Frequently Asked Questions: Perpetua Resources EXIM Loan and Stibnite Gold Project

What is the Perpetua Resources EXIM loan?

It is a $2.9 billion senior secured long-term loan approved by the Export-Import Bank of the United States under its Make More in America Initiative to fund construction of the Stibnite Gold Project in Idaho.

How is the loan structured?

The facility comprises approximately $2.4 billion in an upfront direct loan tranche, with the remaining approximately $500 million covering capitalised interest and EXIM's exposure fee. Interest is fixed at the long-term U.S. Treasury rate plus 100 basis points at the time of initial drawdown.

What is antimony and why does it matter strategically?

Antimony is a metalloid element used in flame retardants, lead-acid batteries, and critically, in defence applications including ammunition, night vision systems, and infrared sensors. China dominates global production, making domestic U.S. supply a national security priority.

Is Stibnite the only U.S. source of antimony?

Based on current identification, the Stibnite Mining District is the only known domestic U.S. reserve of antimony, which is central to the project's strategic and policy financing rationale.

When will the loan become available?

The facility is expected to become available in the second half of 2026, subject to completion of final documentation and satisfaction of customary conditions precedent.

Who are the financial advisors for the transaction?

Endeavour Financial is acting as financial advisor to Perpetua Resources for the EXIM loan transaction, with Hunton Andrews Kurth serving as legal counsel.

How does the EXIM loan interact with existing equity financing?

The loan completes a capital structure that includes $255 million in private placement equity from Agnico Eagle Mines and JPMorganChase, secured in October 2025, alongside Perpetua's existing cash reserves. Together, these components are designed to fully fund project construction.

What environmental commitments come with the project?

The Stibnite redevelopment framework includes active remediation of legacy contamination from prior industrial activity in the district, including restoration of affected waterways. Environmental remediation is positioned as a foundational project obligation rather than a peripheral regulatory requirement.

Key Takeaways

• The $2.9 billion EXIM loan is structured as a senior secured facility with a ~$2.4 billion upfront tranche, with the remainder covering capitalised interest and fees.

• Interest is fixed at the long-term U.S. Treasury rate plus 100 basis points, with repayments beginning in 2030.

• The project's strategic value is anchored in antimony, a critical mineral with no other identified domestic U.S. reserve, alongside primary gold production.

• EXIM's approval followed multi-year due diligence across technical, financial, environmental, and social dimensions, including a mandatory 25-day congressional notice period.

• The broader capital structure includes $255 million in equity from Agnico Eagle Mines and JPMorganChase, alongside Perpetua's existing cash reserves.

• The loan is expected to become available in the second half of 2026, subject to final documentation and conditions precedent.

• The financing model may establish a replicable template for other domestic critical mineral projects combining strategic mineral output with environmental remediation obligations, where private capital markets alone are insufficient to bridge the development gap.

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