Meteoric Resources and the Caldeira Rare Earths Project in Brazil
Meteoric Resources has moved Caldeira from a large ionic-clay resource into a DFS-stage rare-earth project. The remaining execution questions are now permitting, financing, binding offtake, project delivery — and whether the separation step is ultimately built in Brazil or remains distributed across foreign downstream routes.
Meteoric Resources has taken the Caldeira Rare Earth Project to definitive-feasibility level, but it has not yet crossed into sanctioned construction.
The July 31, 2026 DFS models a 6 Mtpa operation based on a 151 Mt Probable Ore Reserve at 3,524 ppm TREO, average annual production of about 12,500 tonnes TREO, including 3,862 tonnes NdPr and 127 tonnes DyTb, and initial capex of approximately US$498 million.
The project already has pilot-plant validation, advanced engineering, environmental licensing work and several downstream relationships. But the public commercial structure remains incomplete: the major POSCO, Neo and Ucore arrangements are non-binding, the Installation License is still pending, project financing must be completed and Meteoric says FID comes after the LI and financing.
The strategic issue is therefore no longer whether Caldeira is a large rare-earth resource. It is how the project is financed, who captures the downstream separation step and which procurement packages become executable once licensing and FID are in place.
Meteoric Resources is now effectively a single-project rare-earth development story
Meteoric Resources Limited is an Australian-listed company focused on developing the Caldeira Rare Earth Project in southwest Minas Gerais. The company acquired Caldeira in March 2023 and has since concentrated on resource drilling, metallurgy, pilot-scale processing, feasibility work, permitting and commercial partnerships.
The company’s current Managing Director and Chief Executive Officer is Stuart Gale. That matters when reading older disclosures: 2024 statements around the Neo and Ucore MOUs were made under former CEO Nick Holthouse and contain project timelines that have since been superseded by the 2026 licensing and DFS schedule.
Caldeira combines a very large resource with a much narrower initial mine plan
The July 2026 DFS reports a global Mineral Resource of 1.631 billion tonnes at 2,317 ppm TREO. Measured Resources total 128 Mt at 2,815 ppm TREO. The DFS mine plan, however, uses only four deposits — Capão do Mel, Barra do Pacu, Figueira and Soberbo — and is supported by a 151 Mt Probable Ore Reserve at 3,524 ppm TREO.
This distinction is commercially important. The resource gives Meteoric long-term optionality, but the first project that suppliers would actually execute is based on the more constrained DFS footprint. Meteoric says more than 80% of its tenure is not included in the DFS mine plan.
The DFS lists 77 mining and exploration licences. Its most recent landholding figure is more than 18,292 hectares across the area between Caldas, Poços de Caldas and Andradas. The company website has previously described the broader holding as more than 193 km²; for current project metrics, this page uses the July 2026 DFS figure.
The DFS moves the discussion from geology to project execution
Meteoric completed the Caldeira DFS on July 31, 2026. The work incorporates more than 90,000 metres of drilling, over 55,000 assayed samples, three years of ANSTO metallurgical work, seven months of pilot-plant operation and detailed engineering supported by Ausenco.
Ausenco’s capital and operating cost estimates were completed to AACE Class 3 accuracy of ±10%. The process plant is designed around an initial throughput of 6 Mtpa and an initial mine life of more than 20 years.
| DFS metric | Spot-price case | Forecast-price case |
|---|---|---|
| Initial capex | US$498m | US$498m |
| Post-tax NPV8 | US$847m | US$2.721bn |
| Post-tax IRR | 24% | 47% |
| Payback | 4 years | 2 years |
| Pricing basis | July 2026 spot prices | Average of long-term Adamas and Argus values used by Meteoric |
Do not turn the two valuation cases into a single range.
The US$847 million and US$2.721 billion post-tax NPVs result from different price assumptions. The more useful execution signal is that the engineering has reached DFS level while permitting, financing and binding commercial agreements still remain ahead of FID.
The pilot plant has materially reduced process risk
Caldeira’s weathered ionic-clay mineralisation is designed to be processed under mild acidic conditions using ammonium sulfate, producing a Mixed Rare Earth Carbonate rather than separated oxides at the mine site.
The pilot plant at Poços de Caldas began operating in late 2025. Between January and May 2026 it processed 43 tonnes of dry ore and produced 213.8 kg of MREC. Average recovery of the magnetic rare-earth oxides Nd, Pr, Dy and Tb was 71%, rising to 80% in May. The plant also demonstrated approximately 85% water recovery and 90% ammonium-sulfate recycling.
Samples have been supplied to existing and potential offtake partners in the United States, Europe and Asia, to Magbras in Brazil, and into studies evaluating oxide separation in Brazil. That gives Caldeira a stronger technical base than a project supported only by laboratory-scale metallurgy.
Caldeira’s mine-site product is MREC, not a finished separated oxide. The project therefore creates one procurement chain for mining and hydrometallurgical processing in Minas Gerais — and a second, still unresolved chain for separation and downstream manufacturing.
The critical near-term gate is the Installation License
Caldeira received its Preliminary License in December 2025. Meteoric then submitted the application for the Installation License (LI) in March 2026. A June 18 licensing update said SEMAD consideration remained scheduled for early in the fourth quarter of 2026.
The DFS is explicit about sequencing: Meteoric plans the Final Investment Decision after the LI is granted and project financing is completed. That makes the current project stage more precise than simply calling Caldeira “construction-ready”.
Caldeira has several downstream options — not three secured offtakes
Meteoric’s commercial network is real, but the agreements have to be read carefully. The major disclosed routes differ by date, counterparty and purpose, and the offtake volumes are not additive committed sales.
| Partner | Date | Status | Publicly disclosed role | Downstream route |
|---|---|---|---|---|
| POSCO International | 29 Jul 2026 | Non-binding strategic memorandum | Up to 30% of production contemplated; strategic financing and Korean ECA support also discussed | Korea / potential Brazil–Korea rare-earth chain |
| Neo Performance Materials | 1 May 2024 | Non-binding MOU | Framework for 3,000 t TREO/y in MREC; right of first refusal above 6,000 t TREO/y | Silmet separation in Sillamäe, Estonia → Narva magnet production |
| Ucore Rare Metals | Aug 2024 | Non-binding MOU | Framework for 3,000 t TREO/y in MREC | Louisiana Strategic Metals Complex, Alexandria, using RapidSX |
The volumes should not be summed.
POSCO’s “up to 30%”, Neo’s 3,000 t TREO/year and Ucore’s 3,000 t TREO/year are overlapping non-binding commercial intentions around future production. They do not represent a cumulative secured sales book.
There is also a technology-development route with Metallium (formerly MTM Critical Metals). A June 2025 MOU followed Flash Joule Heating testwork on Caldeira MREC and is aimed at evaluating an alternative route for upgrading and separating magnetic rare-earth elements. That relationship is relevant to downstream technology optionality, but it is not the same thing as a committed offtake agreement.
The strategic question is whether separation stays in Brazil
The three international routes make the downstream geography unusually visible. Neo points toward Estonia, Ucore toward Louisiana and POSCO toward a possible Korea-linked chain. At the same time, Meteoric is participating in Brazilian efforts to build local rare-earth processing and magnet capacity.
In June 2025, Caldeira was included in the Finep/BNDES Strategic Minerals funding program. Meteoric’s application included pilot work, downstream rare-earth separation leading toward magnet production, and project scaling. The company has also worked with SENAI/Magbras around Brazilian magnet-chain development.
The July 2026 DFS still describes Brazilian downstream MREC separation as preliminary studies. That distinction matters: domestic separation is strategically attractive, but it is not yet presented as a fully sanctioned plant integrated into the Caldeira base-case project.
Caldeira is more advanced upstream than it is downstream. The mine and MREC process have reached DFS-level definition. The location, ownership and financing of the separation stage remain open — creating competing pathways into Brazil, Korea, Europe and the United States.
What the DFS changes for suppliers
The supplier opportunity is becoming more concrete because the DFS has moved the project from conceptual flowsheets toward defined engineering and execution requirements. The document describes a 6 Mtpa processing plant, a new 138 kV power connection, water infrastructure, access roads, dedicated haul roads, off-site fabrication and local-contractor involvement.
Public disclosures also show that Meteoric has already used an Early Contractor Involvement process with preferred construction contractors to improve execution confidence. That means outside suppliers should not assume every equipment or construction package remains completely open.
Three business questions public disclosures do not fully answer
Which Caldeira packages become actionable immediately after the Installation License and FID, and which have already been shaped through ECI, preferred contractors or existing technical relationships?
Which process-equipment, construction and specialist-service categories remain realistically open to international suppliers, and what Brazilian partner, qualification or local-execution requirements apply?
Will Caldeira’s MREC ultimately be separated in Brazil, Korea, Estonia, Louisiana or through another route — and which investment decision would turn that strategic option into a procurement market?
Project-level research around Caldeira and Brazil’s rare-earth supply chain
Econosur can investigate specific commercial questions that public feasibility studies do not resolve.
Project economics, permitting schedules, production targets and commercial arrangements are forward-looking. This page separates current 2026 project milestones from older 2024 MOU timelines that have been superseded.
- Meteoric Resources, 31 July 2026 — Caldeira DFS: 151 Mt reserve, 1.631 Bt resource, production, capex, economics, engineering, infrastructure and FID sequence.
- Meteoric Resources, 9 July 2026 — measured-resource increase to 128 Mt and global resource update.
- Meteoric Resources, 18 June 2026 — Installation License process and current permitting sequence.
- Meteoric Resources, 11 June 2026 — pilot-plant production, 71% average MREO recovery and 80% May recovery.
- Meteoric Resources, 29 July 2026 — POSCO International strategic memorandum and contemplated offtake / financing relationship.
- Neo Performance Materials, 1 May 2024 — non-binding MOU for 3,000 t TREO/year, Silmet separation and Narva magnet route.
- Ucore Rare Metals, August 2024 — non-binding MOU for Caldeira MREC to the Louisiana Strategic Metals Complex.
- Meteoric / MTM, 17 June 2025 — Flash Joule Heating testwork and downstream technology MOU.
- Meteoric Resources, 13 June 2025 — inclusion in the Finep/BNDES Strategic Minerals funding program and Brazilian downstream scope.
- Meteoric Resources — current Caldeira project overview and process description.
- Meteoric Resources — current board and management, including Managing Director and CEO Stuart Gale.
FAQ
What stage is the Caldeira Rare Earth Project at?
The Definitive Feasibility Study was completed on July 31, 2026. The project still requires the Installation License, project financing, binding commercial arrangements and a final investment decision before construction.
How large is the Caldeira resource and reserve?
The July 2026 DFS reports a global Mineral Resource of 1.631 billion tonnes at 2,317 ppm TREO and a 151 Mt Probable Ore Reserve at 3,524 ppm TREO supporting the DFS mine plan.
What does Caldeira plan to produce?
The DFS models approximately 12,500 tonnes TREO per year in MREC on average, including about 3,862 tonnes NdPr and 127 tonnes DyTb annually.
Are the POSCO, Neo and Ucore offtake arrangements binding?
No. The publicly disclosed arrangements are non-binding memoranda or frameworks. Their contemplated volumes overlap and should not be added together as secured sales.
Will Caldeira separate rare earths in Brazil?
Meteoric is studying Brazilian downstream separation and participates in Brazilian strategic-minerals initiatives, but current public disclosures also show potential routes to Korea, Estonia and Louisiana. The final separation geography is not yet fixed.
Who currently leads Meteoric Resources?
Stuart Gale is Meteoric Resources’ Managing Director and Chief Executive Officer. Older 2024 releases quoted former CEO Nick Holthouse and also contained project schedules that have since been superseded.
