Locked inside a mineral crystal
The mineral may need crushing, concentration and chemical opening before its rare earths enter solution.
Follow the element
Same elements. Very different journeys.
Two deposits can report the same headline TREO and require radically different work before a customer can buy anything. The reason begins at a smaller scale: where—and how—the rare earth is held.
- 01DepositWhere it occurs
- 02BindingHow it is held
- 03ProcessWhat must release it
- 04ProofWhat has been demonstrated
Follow one magnet rare-earth element through the evidence chain.
The grade paradox
A headline assay tells you how much. Not how to release it.
TREO measures oxide-equivalent content in the sampled material. It does not say whether the rare earth is exchangeable, recoverable, separable, payable—or economic.
Partly exchangeable on clay
A mild salt may mobilise the exchangeable fraction—but only representative testing can establish how much.
THE INVESTOR QUESTIONWhat must happen between this assay and a qualified product?Zoom beneath the grade
Interactive field guide
Follow one element from deposit to potential product.
Choose a family. The geological setting, binding state and front-end route will change; the downstream proof burden does not disappear.
These four commercially representative pathways are a comparison framework, not an exhaustive geological taxonomy. They deliberately connect setting with the more decisive process question: where the element resides.
Carbonatite-related ore selected.
Carbonatite-related ore
Carbonate-rich igneous systems that can host bastnaesite, monazite and related rare-earth minerals.
WHERE THE ELEMENT SITSInside a mineral crystal
The rare earth is part of a discrete mineral lattice. The mineral must first be liberated from the surrounding rock, then chemically opened before the elements can enter solution.
Investor read: Head grade can be comparatively high, but grade does not remove the need for beneficiation, chemical treatment and separation.
POTENTIAL ADVANTAGES
- Established operating precedents
- Potential for high head grades and scale
- Concentrate can reduce the mass sent to chemical processing
RECURRING CHALLENGES
- Crushing, grinding and mineral concentration
- Thermal or chemical cracking before separation
- Basket, reagent, residue and radionuclide behaviour vary by project
03 · PROCESS ROUTE
Follow the element toward a potential product.
The front end changes with geology. After a rare-earth-bearing solution exists, every route still faces purification, product formation, separation and qualification.
- 01MINEAccess
Extract and prepare competent or weathered ore.
- 02MINERALLiberate
Crush, grind and concentrate the rare-earth-bearing mineral.
- 03CHEMISTRYCreate solution
Use project-specific thermal or chemical treatment and leaching.
- 04SOLUTIONPurify
Control impurities and condition the rare-earth-bearing solution.
- 05INTERMEDIATEMixed product
Precipitate or otherwise form a defined mixed intermediate.
- 06OXIDESSeparate
Separate chemically similar rare earths into specified streams.
- 07CUSTOMERQualify
Demonstrate purity, consistency, scale and commercial acceptance.
Typical route step for the selected family Potentially different or project-specific Shared downstream evidence gate
The decisive distinction
On the clay is not the same as inside a mineral in the clay.
“Clay-hosted” describes where material occurs. “Ion-adsorption” describes a binding mechanism. Confusing the two can lead investors to assume a process advantage that has not been demonstrated.
Exchangeable surface ion selected.
ION-ADSORPTION BEHAVIOUR
A mild salt may exchange the ion.
This is the potentially attractive ionic-clay mechanism. It must be demonstrated through representative extraction, variability and mass-balance work—not inferred from appearance or head grade.
SCIENTIFIC BASIS
Peer-reviewed spectroscopy has identified genuinely exchangeable rare earths as hydrated outer-sphere complexes adsorbed predominantly on kaolinite. That mechanism is the scientific basis for mild salt desorption—not the visual presence of clay alone.
Open the Nature Communications studyFive-question investment test
Ask these before comparing grades.
Every answer changes the amount of technical, capital and commercial work between geology and revenue.
- 01Where is it hosted?
Competent rock, liberated mineral sands, shallow regolith, a residue or another material stream?
- 02How is the element held?
Structurally bound in a mineral, naturally liberated as a grain, or exchangeable on a clay surface?
- 03Which elements drive the basket?
Nd and Pr, with meaningful Dy and Tb—or a larger total dominated by lower-value elements?
- 04What creates a payable product?
Mining, beneficiation, chemical treatment, purification, precipitation, separation and qualification?
- 05What has actually been proven?
Assay, selected diagnostic test, representative recovery, mass balance, pilot product, study or operating performance?
Every rare-earth project moves the difficult step. None eliminates it.
Representative project atlas
Projects—not company labels.
One company can own several geological styles. These source-dated examples illustrate routes and stages; they are not rankings, peer scores or statements of relative value.
8 representative projects shown · source-reviewed 13 August 2026
Mountain Pass
MP Materials · California, United States
Bastnaesite-bearing carbonatite; mining, beneficiation, separation and refining are operating at the site.
Open primary project source (opens in a new tab)Reviewed 7 Aug 2026Tanbreez
Critical Metals Corp. (92.5%) · Southern Greenland
A peralkaline igneous REE-Zr deposit hosted by the Ilímaussaq Alkaline Complex; the owner reports it at the exploration and evaluation stage.
Open primary project source (opens in a new tab)Reviewed 13 Aug 2026Donald
Astron / Energy Fuels JV · Victoria, Australia
A fine-grained heavy-mineral-sands deposit with zircon, titanium minerals and a rare-earth mineral concentrate route.
Open primary project source (opens in a new tab)Reviewed 7 Aug 2026Pela Ema
SVRE Holdings / Serra Verde · Goiás, Brazil
The plant has produced and sold mixed rare-earth carbonate; current disclosures describe commissioning, ramp-up and optimisation.
Open primary project source (opens in a new tab)Reviewed 7 Aug 2026Carina
Aclara Resources · Goiás, Brazil
An ionic-clay project with a filed feasibility study, environmental review and completed semi-industrial pilot campaign.
Open primary project source (opens in a new tab)Reviewed 7 Aug 2026Caldeira
Meteoric Resources · Minas Gerais, Brazil
A resource- and reserve-defined ionic-clay development project with PFS-level process and economic work.
Open primary project source (opens in a new tab)Reviewed 7 Aug 2026Makuutu
Ionic Rare Earths · Uganda
A licensed ionic-clay project with Stage 1 DFS work and mixed rare-earth carbonate produced at demonstration scale.
Open primary project source (opens in a new tab)Reviewed 7 Aug 2026Minas Americas
Magnes Rare Earths · Minas Gerais, Brazil
Shallow clay-hosted mineralisation with ionic behaviour observed in selected diagnostic tests; representative recovery is not established.
See the project evidenceReviewed 7 Aug 2026NOT DEPOSIT TYPES
Stockpiles, residues and by-products are alternative feed routes.
Iluka’s Eneabba monazite stockpile and other secondary streams can be commercially important, but they should not be classified as geological deposit families. Their advantage is a different starting point in the value chain; they still require a defined chemical and separation route.
See the Eneabba exampleMinas Americas evidence overlay
A promising ionic signal. A disciplined proof boundary.
Minas Americas is shallow and clay-hosted, with ionic-adsorption behaviour observed in selected initial diagnostic tests. Representative mineralogy, extraction, mass balance and product work are future evidence gates.
EXPLORATION STAGE · SOURCE POSITION AT 8 SEPTEMBER 2026- 01OBSERVED
Shallow, clay-hosted mineralisation
The supplied 16 June 2026 disclosure describes shallow, clay-hosted rare-earth mineralisation at Minas Americas.
- 02REPORTED
A growing head-assay record
The 8 September 2026 release reports 146 holes and 1,299 assayed metres, bringing cumulative reported assay drilling at Minas Americas to 443 holes and 3,628.8 metres.
- 03TESTED IN SELECTED DIAGNOSTICS
Initial ionic response
Initial selected-sample tests reported desorbable rare earths in solution under stated laboratory conditions. Dated, narrowed source quotation only. The results do not establish representative recovery, an optimised flowsheet, product specifications or economics. Sample/result reconciliation and representative metallurgical work remain outstanding.
- 04NEXT EVIDENCE GATE
Representative extraction and variability
Measure the exchangeable fraction, element-by-element extraction and variability on representative project material.
- 05NEXT EVIDENCE GATE
Mass balance and impurity control
Reconcile feed, solution, residue, losses, water, reagents and impurities before defining a process route.
- 06NEXT EVIDENCE GATE
Representative product and economics
Demonstrate a specified intermediate, separation interface, customer relevance and—only later—project economics.
- Shallow, clay-hosted head-grade mineralisation
- 443 drill holes with reported assay results as at 8 September 2026
- MREO reporting for Nd, Pr, Dy and Tb oxides
- Ionic behaviour in selected initial diagnostic tests
- Project-wide mineral hosts or representative exchangeable fraction
- Element-by-element extraction recovery or feed-solution-residue mass balance
- Column, pilot or continuous-circuit performance
- Representative product, payability, capital, operating costs or economics
Nature may simplify part of the front end. It does not create a product.
Read the metallurgy evidenceSources and limits
Independent science first. Project evidence second.
Deposit-family descriptions are general educational frameworks. Real mineralogy and process circuits vary by project. Project examples are representative, source-dated and unranked. Magnes-specific statements are limited to the cited disclosures.
- Deposit classificationUSGS · Conventional rare-earth element mineral deposits: the global landscape
Conventional deposit framework used as the geological starting point for this comparison.
- Binding mechanismNature Communications · Adsorption of rare-earth elements in regolith-hosted clay deposits
Peer-reviewed evidence for hydrated outer-sphere complexes adsorbed on clay surfaces.
- Value chainInternational Energy Agency · Rare-earth supply-chain pathways
A generalised downstream framework; real circuits remain ore- and project-specific.
- Project geology8 September 2026 first RC and auger results
Selected head-grade drilled intervals are not a mineral resource, reserve, recovery estimate or economic result. True thickness has not been determined. MAV_RC_0012 includes a documented 30-31 m no-recovery interval, and no composite crosses that gap. The separate Drill-Hole and Assay Results Annex referred to in the release is not included in this website package.
- Selected diagnostics21 October 2025 diagnostic screening
The narrative thorium shorthand conflicts with the numerical table. The website uses the Table 2 values reconciled against SGS certificate GQ2509212. Solution concentrations are not recovery percentages, a representative flowsheet, a project-wide radiological profile or evidence of economic extraction.