Rainbow Rare Earths (LSE:RBW) has chosen solvent extraction (SX) as the preferred technique for separating rare earth elements at its Phalaborwa development in South Africa. The method, endorsed in a pre-feasibility review by ANSTO, is expected to deliver high-purity rare earth oxides and provides the clarity needed to lock in the project’s full processing flowsheet. SX is also aligned with the company’s plan to keep capital requirements low, supporting its schedule for construction in 2027 and first production the following year. The company also updated its estimates for annual SEG+ output, indicating it could generate roughly $160 million in yearly revenue.
From a market standpoint, Rainbow Rare Earths continues to face pressure from ongoing losses and the absence of current revenue, which heighten the company’s risk profile. Even so, technical indicators point to strong upward momentum, potentially reflecting investor optimism around Phalaborwa and other strategic initiatives. Valuation remains difficult due to negative earnings, but project progress provides a measure of longer-term confidence.
More about Rainbow Rare Earths
Rainbow Rare Earths is working to build a transparent and independent supply chain for rare earth elements, essential to clean-energy technologies. The company specializes in extracting these minerals from phosphogypsum—a residue from phosphoric acid production—offering a lower-risk, unconventional alternative to typical rare earth mining projects.

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