Rainbow–Neo Phalaborwa offtake: project economics and flowsheet notes for engineers
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Rainbow Rare Earths has secured an offtake and processing memorandum with Neo Performance Materials covering 40% of Phalaborwa’s separated NdPr oxide and 65% of its mixed SEG+ heavy rare earth carbonate, enabling a prefeasibility study in Q4 and pushing the definitive feasibility study to the first half of 2027. Neo will supply solvent extraction design and technical support, with test work on phosphogypsum-derived feed under way in Estonia and an integrated pilot planned in Johannesburg, de-risking the complex separation of dysprosium, terbium and yttrium. The $326 million project would recover magnet rare earths from legacy fertiliser gypsum stacks, potentially feeding Neo’s Estonian separation and sintered magnet plant and offering a non-Chinese supply route linked to European capacity.
Technical Brief
- Development capex for Phalaborwa remains guided at about US$326 million pending PFS update.
- Rainbow will define final products, flowsheet and waste streams in the upcoming PFS for financing.
- Neo’s current test work on Phalaborwa phosphogypsum is being executed at its Estonian separation facilities.
- An integrated pilot-scale processing campaign is scheduled in Johannesburg to validate the end-to-end flowsheet.
- Neo operates both light and heavy rare earth separation plus sintered magnet manufacturing capacity in Estonia.
- The SEG+ stream will contain samarium, europium, gadolinium alongside dysprosium and terbium magnet elements.
- Toll treatment of the remaining 35% SEG+ at Neo’s plant would return separated Dy, Tb and Y to Rainbow.
- Project schedule has slipped, with DFS now targeted for H1 2027 versus an earlier internal timetable.
- Progression from feasibility to construction still depends on permitting, financing and converting the MoU into binding contracts.
Our Take
US equity backing for Rainbow Rare Earths’ Phalaborwa project, highlighted in our 31 July 2026 coverage, means this Neo offtake sits within a capital stack already aligned with Western critical minerals policy, which should ease downstream qualification for NdPr and heavy rare earth supply into US and EU value chains.
Neo Performance Materials’ earlier sale of the Sarfartoq NdPr project in Greenland, alongside this Phalaborwa offtake, suggests Neo is pivoting from owning upstream ore bodies to securing chemically advanced feed (like SEG+ carbonate from legacy phosphogypsum stacks in South Africa) that can be optimised through its existing European processing footprint.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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