Highlights

• Rainbow Rare Earths secures £11.1 million capital raise and strategic alignment with Traxys for phosphogypsum-based rare earth extraction, targeting production by 2029-2030 with significantly reduced capital costs compared to traditional mining.
• The company's unconventional model extracts rare earths from fertilizer waste at Phalaborwa (South Africa) and Uberaba (Brazil), potentially eliminating 60% of conventional project costs while achieving projected EBITDA margins around 70-75%.
• Despite compelling economics and U.S.-backed strategic interest, Rainbow remains a development-stage investment requiring completion of feasibility studies, separation validation at scale, and construction financing before proving commercial viability.

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Rare Earth Exchanges™ interviewed (opens in a new tab) Rainbow Rare (opens in a new tab) Earths CEO George Bennett (opens in a new tab) recently, and the company just announced (opens in a new tab) via Proactive Investors an £11.1 million capital raise and strategic alignment with Traxys (and the U.S. Vault initiative) linked to U.S. critical mineral initiatives. The discussion highlights Rainbow’s unconventional phosphogypsum-based extraction model, its positioning in the ex-China supply chain, and the key investor question: can this approach materially de-risk timelines and costs in a sector where most projects fail?

Waste to Wealth—or Capital at Risk?

In a sector defined by delays and blown budgets, Rainbow Rare Earths (LSE: RBW) is attempting a different path. Rather than developing a traditional mine, the company is extracting rare earth elements from phosphogypsum—industrial waste generated during fertilizer production, as was discussed via the Rare Earth Exchanges™ podcast. Now, backed by a fresh £11.1 million raise and growing alignment with U.S.-linked supply chain initiatives via Traxys, Ian Lyall reports CEO George Bennett positions Rainbow as a near-term, low-cost producer outside China.

George Bennett, CEO

Source: LinkedIn

For investors, the proposition is clear: reduced capital intensity, accelerated timelines, and exposure to geopolitical tailwinds favoring non-China supply.

Rewriting the Playbook: Turning Waste Into Feedstock

Rainbow’s two flagship projects—Phalaborwa (South Africa) and Uberaba (Brazil) as reported by _Rare Earth Exchanges_—rely on pre-processed chemical stockpiles rather than newly mined ore. By bypassing mining, crushing, and concentration, the company removes up to 60% of a conventional rare earth project’s cost structure .

Management cites relatively high grades (~0.44–0.52% TREO for this class of material) and faster development timelines, targeting production in 2029–2030—well below the industry’s typical 15–20 year cycle. Conceptually, the model is compelling. Operationally, it remains unproven at commercial scale.

Where the Investment Case Holds—and Where It Stretches

Signals of Credibility

• Waste-derived feedstocks can materially lower CAPEX and environmental complexity.
• Strategic interest from U.S.-aligned entities reflects growing policy support for ex-China supply.
• Industry reality supports the thesis: most rare earth projects fail before production.

Points of Friction

• Claims of “lowest-cost producer” and ~75% EBITDA margins remain model-based, not realized.
• Separation—the critical midstream step—still requires execution, capital, and technical validation.
• Timelines, while shorter than peers, remain ambitious in a sector prone to delays and cost overruns.

The Bigger Frame: Capital Meets Geopolitics

Rainbow’s rise and positioning reflect a broader shift—what Rare Earth Exchanges defines as Great Powers Era 2.0. Governments and capital markets are increasingly aligned around securing critical mineral supply chains outside China. Yet structural realities persist: China continues to dominate roughly 85–90% of rare earth refining and magnet production. Upstream innovation alone does not solve midstream dependence.

Final Take: A Smarter Model, Still an Execution Story

Rainbow Rare Earths presents a differentiated approach that addresses some of the industry’s most persistent bottlenecks—cost, timeline, and environmental burden. The £11.1 million raise provides near-term runway and signals growing strategic interest.

But investors tracking the Rare Earth Exchanges REEx Insights understand this remains a development-stage investment. Until feasibility studies are completed, separation is demonstrated at scale, and financing for construction is secured, the story is one of potential—not proof. But Bennett and the team have a vision, a strategy, and a plan, so the prospects are intriguing, as the risks remain high.

Corporate Profile

Rainbow Rare Earths positions itself as a differentiated rare earth developer by focusing on extracting critical elements from phosphogypsum waste rather than traditional mining. The March 2026 corporate presentation (opens in a new tab) emphasizes a “low-cost and responsible” supply model built on proprietary IP that leverages already processed chemical stockpiles, eliminating much of the cost and complexity of mining, crushing, and concentration . Its two core assets—Phalaborwa in South Africa and Uberaba in Brazil—are framed as Tier 1 projects with strong economics, including projected EBITDA margins around 70%, post-tax IRRs of ~38–45%, and capital expenditures in the ~$279M–$326M range. The company highlights strategic backing from U.S.-aligned entities such as the DFC and TechMet, reinforcing its positioning as part of an emerging ex-China supply chain for magnet-critical elements like neodymium, praseodymium, dysprosium, and terbium.

Technically, Rainbow’s process relies on the fact that rare earths become concentrated in phosphogypsum during fertilizer production, creating a “chemically cracked” feedstock amenable to direct leaching and simplified downstream processing.

Pilot plant work has demonstrated production of high-grade mixed rare earth products (~55% TREO), exceeding typical Chinese specifications, while ongoing test work aims to finalize a streamlined flowsheet combining continuous ion exchange and limited solvent extraction.

The company outlines a relatively accelerated pathway to production, targeting construction by 2027 and initial output by 2028–2030, with scalability through replication at Uberaba.

Investors should note, however, that the presentation also makes clear that key milestones—definitive feasibility studies, permitting, and financing—remain ahead, and explicitly cautions that forward-looking statements carry material uncertainty, underscoring that the investment case hinges on successful execution rather than concept alone.

In rare earths, capital follows execution. And execution, not concept, will determine whether Rainbow becomes a meaningful player—or another well-structured idea in a difficult market.