Ioneer Weighs Takeover of Rio's U.S. Boron Assets to Fuel Energy-Mineral Push

Australian lithium miner Ioneer Ltd. is considering a bid for Rio Tinto Group's US boron assets, which include a major mine in California. The move aims to consolidate Ioneer's Nevada boron-and-lithium project with Rio's operations. CEO Bernard Rowe highlighted the strategic synergies between the two companies.

Boron, a critical mineral used in fertilizers and industrial applications, has gained attention in the

US government's critical minerals list. Rio's California operations account for about 30% of global boron demand. The element is vital for fiberglass, metal alloys, and rare-earth magnets.

Ioneer's Rhyolite Ridge project in Nevada has government backing but recently lost a key partner. The company is now seeking new investors, including private equity and chemical firms, to fund its expansion according to reports.

Strategic Market Position

The potential acquisition aligns with global trends in energy transition and industrial demand. Boron's use in semiconductors, defense technologies, and clean energy applications is growing. This makes it a strategic asset in an increasingly competitive market.

Ioneer's interest in Rio's assets is part of a broader industry shift toward securing critical minerals. The company believes combining its Nevada operations with Rio's California deposits could enhance efficiency and production scale.

Financing and Investment Plans

Ioneer is seeking a consortium-style equity funding model to attract diverse investors. The company is working with Goldman Sachs Group Inc. to secure new partnerships. Expected investment is projected for the first half of 2026.

The mining sector has seen increased government involvement globally. In Australia, Prime Minister Anthony Albanese recently announced a rescue plan for Rio's Tomago aluminum smelter, highlighting the importance of critical minerals in national supply chains.

Implications for the Boron Market

Rio Tinto is not the only company positioning itself in the boron market. 5E Advanced Materials, a California-based firm, is also preparing to scale production. The company has secured permits and is nearing commercial production with a cost-efficient model.

The global boron market is currently dominated by a few players. 5E Advanced Materials aims to disrupt this structure by offering competitive pricing and reliability. The company's strategy focuses on supplying the US and Asia, where demand is expected to rise.

Environmental and Community Considerations

Mining operations have faced scrutiny over environmental impact and community relations. Ioneer and 5E Advanced Materials emphasize sustainable practices, including low-impact mining techniques and local job creation.

In Australia, Rio Tinto has taken steps to improve community relations through modernized agreements with Indigenous groups. The company signed an interim deal with the Yinhawangka Aboriginal Group, focusing on environmental and cultural heritage collaboration.

Investor and Market Reactions

The news of potential bids and partnerships has generated interest among investors. Rio Tinto's shares showed a positive response following government support for the Tomago smelter. Investors are watching for further developments in the critical minerals market.

The lithium and boron sectors are closely linked, as both minerals support the clean energy transition. Ioneer's move into the boron space could diversify its portfolio and reduce dependency on lithium alone.

Looking Ahead

The next steps for Ioneer involve securing financing and formalizing its bid for Rio's boron assets. The company expects to finalize partnerships in early 2026, aligning with its broader growth strategy.

As the demand for critical minerals continues to rise, companies like Ioneer and 5E Advanced Materials are well positioned to capitalize on market opportunities. Their efforts to secure stable, domestic supply chains could reshape the global mineral landscape.