Meteoric Resources has completed a Definitive Feasibility Study for its Caldeira Rare Earth Project in Brazil, revealing a large, high-grade ionic clay deposit with a 20-plus year mine life and strong financial metrics.
- 151Mt Ore Reserve at 3,524ppm TREO
- Average annual production of 12,500 tonnes TREO
- Capital cost estimated at US$498 million
- Low operating costs around US$11.68/kg TREO
- Non-binding offtake agreements with major industry players
Caldeira DFS Validates Project Scale and Quality
Meteoric Resources Limited (ASX:MEI) has delivered a comprehensive Definitive Feasibility Study (DFS) for its Caldeira Rare Earth Project in Minas Gerais, Brazil, confirming the project’s technical and economic viability. The DFS highlights a substantial Ore Reserve of 151 million tonnes at 3,524ppm total rare earth oxides (TREO), positioning Caldeira as one of the largest and highest-grade ionic clay rare earth deposits outside China.
The project’s mine plan spans over 20 years at an initial processing rate of 6 million tonnes per annum (Mtpa), with an average annual production of 12,500 tonnes TREO, including significant volumes of strategic magnetic rare earth elements such as neodymium, praseodymium, dysprosium, and terbium. Early years benefit from higher grades exceeding 5,000ppm TREO, underpinning an expedited payback period.
Robust Financial Metrics and Low-Cost Operations
Financial modelling based on spot and forecast pricing scenarios yields a post-tax net present value (NPV8) of US$847 million and US$2.7 billion respectively, with internal rates of return (IRR) ranging from 24% to 47%. The project’s capital expenditure is estimated at US$498 million, including a 10% contingency, reflecting a detailed AACE Class 3 estimate with approximately ±10% accuracy.
Operating costs are competitive, with a life-of-mine cash operating cost (C1) of US$11.68 per kilogram of TREO and an all-in sustaining cost (AISC) of US$16.74/kg TREO. These costs translate to an NdPr operating cost of around US$27/kg after accounting for by-product credits, offering attractive margins against current and forecast rare earth prices.
Metallurgical Confidence Backed by Extensive Pilot Plant Data
Caldeira’s metallurgical process leverages the unique properties of ionic clay-hosted rare earths, enabling low-cost extraction via ammonium sulfate leaching at ambient temperature and pressure. The DFS incorporates over three years of bench and pilot-scale testwork conducted by the Australian Nuclear Science and Technology Organisation (ANSTO), complemented by more than six months of continuous pilot plant operation in Brazil.
The pilot plant has consistently exceeded design throughput and recovery targets, achieving magnetic rare earth oxide recoveries averaging 71%, with product purity meeting industry specifications and no radiological classification required for transport. This operational validation reduces technical risk and supports the project’s capital and operating cost estimates.
Strategic Location, Infrastructure, and Environmental Stewardship
Situated in Minas Gerais, Brazil’s largest mining state, the Caldeira Project benefits from established infrastructure, including proximity to major highways and the Port of Santos for export logistics. Power will be supplied via a dedicated 29km 138kV transmission line from Companhia Energética de Minas Gerais (CEMIG), with 100% renewable energy sourced, aligning with the project's environmental goals.
The project’s environmental impact has been extensively studied, with a Preliminary Environmental License granted and the Installation License expected in Q4 2026. The mine design eliminates the need for tailings dams by progressively backfilling spent clays into mined-out pits, reducing long-term liabilities and closure costs. Community engagement is robust, with no resettlement required in Stage 1 and strong local support.
Offtake and Financing Discussions Progressing
Meteoric has secured non-binding offtake agreements with major industry players including POSCO International Corporation (South Korea), Neo Performance Materials Inc. (Canada), and Ucore Rare Metals Inc. (Canada). These agreements facilitate ongoing negotiations on pricing, volume commitments, and integration with project financing solutions.
On the financing front, the DFS provides a solid foundation for discussions with export credit agencies, development finance institutions, commercial lenders, and strategic investors. Expressions of interest include potential support from the Export-Import Bank of the United States and Export Finance Australia, underscoring the project’s strategic importance in diversifying rare earth supply chains.
Path to Final Investment Decision and Construction
The DFS sets the stage for a Final Investment Decision (FID) following the granting of the Installation License and completion of project financing. Construction is planned to commence shortly thereafter, with a targeted 26-month build period leading to first production in 2029. The project execution strategy emphasises early contractor involvement and local content, leveraging the region’s mature mining and industrial workforce.
Operational readiness planning is well advanced, focusing on achieving world-class plant availability and mining productivity benchmarks. The project’s scale, cost profile, and strategic positioning aim to secure Caldeira as a cornerstone supplier in global rare earth markets amid growing demand driven by electrification, renewable energy, and defense applications.
Bottom Line?
Caldeira’s DFS confirms a technically and financially robust rare earth project poised to capitalize on growing global demand, but success hinges on timely permitting, final financing, and securing binding offtake agreements.
Questions in the middle?
- How will rare earth market price volatility impact Caldeira’s long-term profitability?
- What are the key risks in securing the Installation License by the targeted Q4 2026 timeframe?
- To what extent will binding offtake agreements influence project financing and development pace?