Direct-leach metallurgy at Kameelburg skips the flotation plant that swallows capex at most peer rare earth projects
Aldoro Resources (ASX:ARN) just delivered maiden metallurgical results at its Kameelburg Rare Earth and Strontium Project in Namibia, and the headline number is 72% Total Rare Earth Element recovery from a straight hydrochloric acid leach. For investors who follow rare earth developers, they may be intrigued by hearing ‘72%’, but we think the phase ‘straight hydrochloric acid leach’ is far more important.
Most rare earth projects on the ASX rely on monazite, bastnäsite or xenotime ores. Those minerals demand a flotation or magnetic separation plant up front, followed by a high-temperature acid-bake to crack the host mineral. Kameelburg’s ancylite mineralisation skipped both steps in this testwork and still pulled 69% of the rare earths into solution in a single pass.
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The other number worth circling is 99% strontium recovery, achieved consistently across every test. Kameelburg already hosts what Aldoro describes as the world’s largest reported strontium resource. A second revenue line, recovered alongside the rare earths, changes how this project should be modelled.
And yes, the ticker ARN used to belong to ARN Media before Aldoro picked it up. Different company, very different story, and a far more interesting one for resource investors right now.
Why skipping the beneficiation plant matters more than the recovery number
Beneficiation is the part of a rare earth project that quietly swallows capital. Building a flotation circuit, grinding circuit and a downstream acid-bake plant is typically the largest single line item on a rare earth feasibility study. Mt Weld, Mountain Pass and Yangibana all carry that cost.
Kameelburg’s ancylite is a hydrous strontium-cerium-lanthanum carbonate that dissolves directly in hydrochloric acid. The maiden testwork confirms this works in practice on a whole-rock composite. If that result holds up at pilot scale, Aldoro avoids the most capital-intensive unit in a conventional rare earth flowsheet.
That is a meaningful structural advantage, not a marketing line. The cautionary read is that the comparison projects in Aldoro’s table are all further down the development curve, so the cost gap is theoretical until a scoping study puts a number on it.
Where the 72% sits against peers, and where the work still needs to happen
Aldoro pointed out that the 69% single-pass recovery is materially above the 42.7% reported for Peak Rare Earths’ Ngualla project in Tanzania. That is a fair benchmark, with the caveat that Ngualla has been through bankable feasibility while Kameelburg has just completed its first leach test.
The recovery was achieved at ambient temperature, without grinding optimisation, and without pre-concentration. Aldoro has flagged elevated temperature leaching, finer grind, and flotation pre-concentration as the next levers. Industry experience suggests heating an ancylite leach to 60-90 degrees should lift kinetics meaningfully.
We think the real metallurgical question is not whether recovery can be improved. It is whether the acid consumption can be tamed once the testwork moves out of the laboratory.
The strontium story is the quiet asymmetry here
Strontium is not glamorous. It does not have the magnet rare earth tailwind that has pushed neodymium prices higher through 2026. But 99% extraction off a 2.67% head grade, on a resource base already described as the world’s largest reported, is the kind of co-product economics that can underwrite a project’s early cash flow.
Most rare earth developers are single-product stories with all the timing risk that implies. A strontium carbonate stream changes the funding conversation, particularly if magnet prices wobble through the build phase.
The skeptical read is that strontium carbonate is a relatively small global market, and a primary producer at Kameelburg’s scale would need to think carefully about pricing discipline.
The Investors Takeaway for Aldoro Resources
Maiden metallurgy is exactly that. Maiden. The 72% recovery is a strong baseline, the strontium numbers are eye-catching, and the direct-leach characteristic is genuinely differentiated. None of that is a process flowsheet, and none of it is a scoping study.
What we want to see next is QEMSCAN mineralogy on the leach residues, elevated temperature leach data, and a credible read on acid consumption at concentration. Those three pieces will determine whether Kameelburg becomes one of the more capital-efficient rare earth developments on the ASX, or just another promising metallurgical headline that struggles in scale-up.
Investors can read our previous coverage of the ARN ticker, from its prior life as ARN Media, at stocksdownunder. The company behind those letters has changed entirely. The story worth watching now is in Namibia.
