20-F: Ioneer Secures DOE Loan, Boosts Reserves for Nevada Lithium-Boron Project

Ioneer Ltd. has finalized a $996 million DOE loan and significantly increased its Rhyolite Ridge Project's mineral reserves, despite a partner withdrawal and ongoing legal challenges.

Summary

• Ioneer Ltd. (ioneer) has secured a US$996 million loan from the U.S. Department of Energy (DOE) Loan Programs Office for its Rhyolite Ridge Lithium-Boron Project in Nevada, which includes US$968 million in principal and US$28 million in capitalized interest.
• The loan amount represents a US$268 million increase from the conditional loan commitment announced in January 2023.
• The Rhyolite Ridge Project received its federal permit (Record of Decision ROD) from the Bureau of Land Management (BLM) on October 25, 2024, following the final Environmental Impact Statement (EIS) in September 2024.
• The project's mineral resource estimate increased by 45% to 510 million tonnes (Mt) in March 2025, and the ore reserve more than quadrupled to 247 Mt in June 2025.
• Updated project economics, released in June and September 2025, reaffirm Rhyolite Ridge's potential as a low-cost, long-life, and globally significant producer of lithium and boron.
• The total capital expenditure to complete the project is estimated at US$1,667.9 million, including a 10% contingency, a significant increase from the 2020 DFS estimate of US$785 million.
• Sibanye-Stillwater Ltd decided not to proceed with the proposed joint venture in the Rhyolite Ridge Project on February 26, 2025, leading to the termination of their agreement.
• The company reported a net loss of US$9,554,000 for fiscal year 2025, an increase from US$7,825,000 in fiscal year 2024, with accumulated losses reaching US$69,906,000 as of June 30, 2025.
• Ioneer has secured binding offtake agreements for approximately 90% of its expected first three years of lithium carbonate production and 100% of its first four years of projected boric acid production.
• The project is designed to produce technical-grade lithium carbonate for the first two years, transitioning to battery-grade lithium hydroxide from year three onwards, with boric acid accounting for approximately 25% of project revenue.

Sentiment

Score: 6

Explanation: The sentiment is moderately positive. While securing the DOE loan, significantly increasing reserves, and advancing permitting are strong positives, the increasing net losses, partner withdrawal, higher capital cost estimates, and ongoing legal/regulatory challenges introduce notable caution. The project's long-term economic viability is reaffirmed, but significant hurdles remain in the development phase.

Positives

• Secured a US$996 million loan from the U.S. Department of Energy, an increase of US$268 million from the initial conditional commitment.
• Received the federal Record of Decision (ROD) from the BLM on October 25, 2024, concluding the federal permitting process for the Rhyolite Ridge Project.
• Increased the mineral resource estimate by 45% to 510 million tonnes in March 2025.
• More than quadrupled the ore reserve to 247 million tonnes in June 2025, indicating a robust and long-life project.
• Updated project economics in September 2025 show material improvements, reaffirming the project's viability.
• Achieved significant lithium offtake agreements covering approximately 90% of expected first three years of production with major partners like Ford, PPES, EcoPro Innovation, and Dragonfly Energy.
• Secured boric acid offtake and distribution agreements covering 100% of the first four years of projected production.
• The project is expected to become a low-cost and globally significant producer of both lithium and boron, vital for a sustainable future.
• Approximately 70% of the project's engineering is complete, utilizing an AACE Class 2 capital cost estimate, indicating advanced development.

Negatives

• Net loss increased to US$9,554,000 in fiscal year 2025 from US$7,825,000 in fiscal year 2024, continuing a trend of increasing losses.
• Accumulated losses reached US$69,906,000 as of June 30, 2025, reflecting the development stage without revenue.
• Sibanye-Stillwater Ltd decided not to proceed with the proposed joint venture in February 2025, requiring ioneer to seek alternative equity partners.
• The estimated total capital expenditure of US$1,667.9 million is significantly higher than the 2020 DFS estimate of US$785 million, with expectations for further cost inflation.
• Ongoing legal challenges by non-government organizations against the BLM's Record of Decision and FWS's Biological Opinion could cause delays.
• The proposed listing of Fish Lake Valley Tui Chub (FLVTC) as an endangered species could potentially reinitiate Section 7 consultation under the ESA, leading to project delays.
• Finance income decreased significantly to US$653,000 in fiscal year 2025 from US$1,411,000 in fiscal year 2024.
• The company believes it was a Passive Foreign Investment Company (PFIC) for FY2025 and expects to be for the current taxable year, which could have adverse tax consequences for U.S. investors.

Risks

• Need for additional funds beyond the DOE loan and current strategic partnering efforts to fully develop the project and maintain liquidity.
• Uncertainty in achieving commercial extraction of mineral deposits and realizing profits in the short to medium term due to high financial risk in exploration and development.
• Risks inherent in the mining industry, such as geological formations, natural disasters, power/water shortages, labor disruptions, and environmental liabilities.
• Inability to access capital or financial markets on favorable terms, potentially limiting business plan execution and growth strategies.
• Failure to successfully secure a strategic equity partner or satisfy conditions precedent for the first draw of the DOE loan could adversely affect funding and project timelines.
• Lawsuits by third parties, such as non-governmental organizations, challenging permits or environmental decisions, could cause lengthy delays and uncertain outcomes.
• Government regulations, including the Endangered Species Act (ESA) and Federal Land Policy and Management Act (FLPMA), could impose restrictions, delays, or increased costs.
• Unpatented mining claims carry inherent uncertainties regarding title, discovery of valuable minerals, and potential forfeiture if statutory requirements are not met.
• Proposed legislation could impose federal royalties on production from unpatented mining claims, significantly affecting operational costs and financial performance.
• Cybersecurity risks, including unauthorized access to IT systems, theft of intellectual property, or data breaches, could harm competitive position and increase costs.
• Volatility in lithium and boron prices or demand, influenced by economic trends, technological changes, and new production, could adversely affect project economics.
• Changes in technology or development of substitute products could reduce demand for lithium and boron.
• New production from competitors could increase supply and negatively affect commodity prices.
• Loss of foreign private issuer status could increase regulatory and compliance costs under U.S. securities laws.
• The company's status as a Passive Foreign Investment Company (PFIC) could result in adverse U.S. federal income tax consequences for U.S. investors.

Future Outlook

The company aims to become a low-cost, globally significant producer of lithium and boron, with construction targeted to commence after all permitting is received, funding is in place, and a Final Investment Decision (FID) is made. Construction is expected to take approximately 36 months, followed by a 6-month ramp-up period. The company plans to continue its strategic partnering process to secure equity funding and further exploration programs in the South and North Basins. Market forecasts anticipate continued strong demand for lithium, particularly from the EV sector, and growing demand for boric acid, supporting the project's long-term viability.

Management Comments

• The Rhyolite Ridge Project's unique mineralogy allows lithium and boron to be extracted in a low-cost and environmentally sustainable manner.
• The Project's commercial viability is made possible by having both lithium and boron revenue streams.
• The updated Project economics reaffirmed Rhyolite Ridge can operate at scale, over a long life and with the potential to be a low-cost and globally significant producer of both lithium and boron.
• The conservative approach to plant availability, equipment downtime, and maintenance strategies is appropriate for a Project of this type and scale, despite reducing bottom line economics.
• Ioneer is committed to offering housing incentives and assistance programs to employees, believing it derives greater economic benefits for local communities and enhances housing infrastructure.

Industry Context

The Rhyolite Ridge Project is positioned to capitalize on the rapidly growing demand for lithium, primarily driven by the increasing adoption of electric vehicles (EVs) and lithium-ion batteries. While the lithium market is currently experiencing some price pressures due to supply-demand dynamics, the long-term outlook remains positive. The boric acid market, though less transparent, is also expected to see steady growth, with Ioneer aiming to diversify its customer base. The project's location in Nevada, a favorable mining jurisdiction, and its focus on producing materials essential for advanced technology vehicles, align with global trends towards sustainable energy and domestic supply chain security.

Comparison to Industry Standards

• The project's updated capital cost estimate uses an Association for the Advancement of Cost Engineering (AACE) Class 2 estimate (-10%, +15%), indicating a high level of engineering completion (approximately 70%) for a project of this stage.
• The project's expected lithium recovery is higher than typical brine or spodumene projects due to vat leaching of whole ore, two stages of crystal washing for sulfate salts, and contained processing systems that minimize losses.
• The project's estimated average annual production of 25,118 metric tons of lithium carbonate equivalent (LCE) over its first 20 years is expected to be absorbed by market demand by 2029-2030, according to Benchmark Minerals and Wood Mackenzie forecasts.
• Ioneer's boric acid production is expected to contribute to a market that will enter a deficit by 2035, based on an 85% utilization rate cap, positioning it as a new, alternative supplier in a market dominated by Eti Maden and Rio Tinto Minerals.
• The project's levered post-tax internal rate of return (IRR) of 20.9% (if DOE loan conditions are met) indicates strong economic viability compared to many large-scale mining projects.

Management Changes

Corporate Governance

Legal Proceedings

• A lawsuit was filed on October 31, 2024, by three non-government organizations (Center for Biological Diversity, Great Basin Resource Watch, and Western Shoshone Defense Project) against the BLM and FWS. The suit seeks to vacate the Department of Interior decisions related to the BLM's Record of Decision and FWS's Biological Opinion for the Rhyolite Ridge Project. Ioneer has joined the case as an intervenor, and the case is pending in the United States District Court for the District of Nevada, with no injunctions related to site construction issued to date.

Related Party Transactions

• No material related party transactions or loans occurred since the start of fiscal 2022, other than employment and compensation matters for key management personnel.

Stakeholder Impact

• Shareholders face potential dilution from future equity financings and risks associated with the company's PFIC status for U.S. federal income tax purposes.
• Employees will benefit from job creation during the construction (500 people for four years) and operational phases (350 people for 14 years), with the company committed to housing incentives and assistance programs.
• Local communities in Esmeralda County, Nevada, are expected to see enhanced public services and infrastructure upgrades due to a development agreement with Ioneer, alongside increased demand for housing, healthcare, and other services.
• Native American tribes are being consulted regarding potential impacts on cultural sites, resources, and traditional activities, with project design aiming to avoid direct surface impacts.
• Creditors, particularly the DOE, have secured a significant loan, but its full disbursement is contingent on further funding and strategic partnerships, impacting the company's ability to meet its obligations.

Next Steps

• Complete required financing activities, including securing a strategic partnering agreement for the equity component of the build cost and additional required funding.
• Commence construction of the Rhyolite Ridge Project, targeting approximately 36 months for completion, followed by a 6-month ramp-up of production.
• Continue exploration programs to define additional reserves and resources in the South Basin and assess economic potential of the North Basin.
• Secure additional boric acid distributor sales agreements in North America and Taiwan following the financial investment decision.
• Conduct additional hydrogeological data collection and modeling for NEPA analysis required for project expansion.

Key Dates

Recommendation

The Rhyolite Ridge Project has achieved significant milestones, including a substantial DOE loan, federal permitting, and a quadrupling of ore reserves, which are strong indicators of its long-term potential in the critical minerals sector. However, the company is still in a development stage, evidenced by increasing net losses and accumulated losses. The withdrawal of Sibanye-Stillwater as a joint venture partner necessitates securing new equity funding, and ongoing legal challenges pose potential delays. While the project's economics are robust, the inherent risks of large-scale mining development, capital requirements, and regulatory uncertainties warrant a cautious 'hold' recommendation. Investors should monitor progress on equity financing, resolution of legal proceedings, and the commencement of construction before considering further investment.

Keywords

lithium, boron, Rhyolite Ridge, Nevada, DOE loan, advanced technology vehicles, mining, mineral resources, ore reserves, SEC filing, Ioneer, EV battery materials, critical minerals