By Charles Pitts
POÇOS DE CALDAS, Brazil : Meteoric Resources NL (ASX: MEI) has announced a substantial upgrade to the Mineral Resource Estimate (MRE) for its flagship Caldeira Rare Earth Project, reporting a 246% increase in the Measured Resource category. The update, based on extensive infill drilling across the Brazilian project, elevates the Measured Resource to 128 million tonnes (Mt) at a grade of 2,815 ppm Total Rare Earth Oxide (TREO).
The global MRE for Caldeira now stands at 1.6 billion tonnes (Bt) at an average grade of 2,317 ppm TREO, reinforcing its position as one of the world’s most significant high-grade ionic clay rare earth deposits. This milestone arrives as the company accelerates its Definitive Feasibility Study (DFS), providing the high-confidence data required for long-term mine planning and metallurgy.
Data-Driven Confidence: The Path to 1.6 Billion Tonnes
The resource boost is the culmination of a 304-hole, 9,200-meter drilling program completed earlier this year. By implementing a tighter 50m x 50m grid in key areas, Meteoric successfully converted a massive portion of its Indicated resources into the Measured category: the highest confidence level in mineral reporting.
“This 246% jump in Measured resources is a transformative moment for the Caldeira Project,” said a spokesperson for the company. “Moving over 100 million tonnes into the Measured category at such high grades provides the technical certainty needed to underpin the upcoming DFS and future project financing.”
The drilling focused primarily on the Capão do Meio, Figueira, and Soberbo deposits, which are expected to serve as the initial feedstock for the project’s processing facility.
| Resource Category | Tonnage (Mt) | Grade (ppm TREO) | Contained TREO (kt) |
|---|---|---|---|
| Measured | 128 | 2,815 | 360 |
| Indicated | 575 | 2,572 | 1,479 |
| Inferred | 897 | 2,156 | 1,934 |
| Total Global MRE | 1,600 | 2,317 | 3,773 |
High-Value Magnet REOs: Neodymium and Dysprosium Breakdown
The true value of the Caldeira Project lies in its high concentration of “magnet rare earths”: specifically Praseodymium (Pr), Neodymium (Nd), Terbium (Tb), and Dysprosium (Dy). These elements are critical for the production of high-strength permanent magnets used in electric vehicle (EV) motors and wind turbines.
According to the updated MRE, the contained oxide inventory for these critical minerals includes:
- Neodymium (Nd): 594,000 tonnes
- Praseodymium (Pr): 209,000 tonnes
- Dysprosium (Dy): 34,000 tonnes
- Terbium (Tb): 6,000 tonnes
The inclusion of heavy rare earths like Terbium and Dysprosium is particularly notable. While many rare earth projects are dominated by light REEs, the ionic clay nature of the Poços de Caldas caldera allows for a more diversified mineral suite that commands premium pricing in global markets.
Why Ionic Clays are the “Holy Grail” of Rare Earths
The Caldeira Project is classified as an Ionic Adsorption Clay (IAC) deposit. Unlike hard-rock deposits (such as Mountain Pass in the U.S. or Arafura’s Nolans project), ionic clays are typically found at very shallow depths and do not require the energy-intensive crushing and grinding associated with traditional mining.
In an IAC deposit, the rare earth elements are “adsorbed” onto the surface of clay minerals. They can be extracted using a simple leaching process: often with a dilute ammonium sulfate solution at near-neutral pH. This leads to significantly lower capital expenditure (CAPEX) and operating costs (OPEX). Furthermore, IAC deposits generally have lower concentrations of radioactive elements like thorium and uranium, simplifying the environmental permitting process.
Strategic Importance: Brazil’s Role in the Global Supply Chain
The expansion of the Caldeira resource comes at a time of heightened geopolitical sensitivity surrounding critical mineral supply chains. Currently, China controls over 90% of the world’s ionic clay production and a similar share of the magnet-making market.
Brazil, with its favorable mining jurisdiction and established industrial base, is emerging as the primary contender to diversify this supply. The Poços de Caldas region, in particular, is a historic mining district with existing infrastructure, including power, roads, and a skilled local workforce.
The scale of Meteoric’s 1.6 Bt resource suggests that Caldeira could potentially support a multi-decade mine life, positioning Brazil as a Tier-1 global supplier. This development aligns with broader trends in critical minerals watchlist and industry outlooks, where investors are increasingly prioritizing low-cost, ESG-compliant assets outside of China.
Market Snapshot: Rare Earths & Strategic Metals
July 9, 2026
| Commodity | Current Price (USD/kg) | 24h Change | 2026 Outlook |
|---|---|---|---|
| Neodymium-Praseodymium (NdPr) | $92.40 | +1.2% | Bullish |
| Dysprosium Oxide | $315.00 | +0.8% | Stable |
| Terbium Oxide | $1,180.00 | -0.2% | Neutral |
| Copper (LME) | $10,450/t | +0.5% | Bullish |
Next Steps: Moving Toward Production
With the Measured Resource now firmly established, Meteoric Resources is shifting focus toward the completion of the DFS. Key workstreams currently underway include:
- Pilot Plant Testing: Large-scale metallurgical testing to optimize recovery rates.
- Environmental Permitting: Finalizing the Environmental Impact Assessment (EIA/RIMA) for the project.
- Offtake Negotiations: Securing long-term supply agreements with Western OEMs and magnet manufacturers.
The company expects to transition into the development phase shortly after the DFS release, aiming to be one of the first major ionic clay producers to come online outside of Asia.
Analysis: A New Benchmark for Scale
The 246% increase in Measured resources at Caldeira isn’t just a win for Meteoric shareholders; it’s a data point that reshapes the valuation of the entire ionic clay sector. Previously, skeptics questioned whether the high grades found in initial exploration would hold up under rigorous infill drilling. This update confirms that they do.
At 2,815 ppm TREO in the Measured category, Caldeira sits at the very top of the global peer group. For comparison, most Chinese ionic clay deposits operate at grades between 500 and 1,000 ppm. Meteoric is effectively working with a resource that is three times as concentrated as the current industry standard.
As the industry moves into the second half of 2026, the focus will turn from “how much is there?” to “how quickly can it be built?” With 1.6 billion tonnes in the ground, the “how much” has been answered definitively.
Frequently Asked Questions
What is the Caldeira Project?
The Caldeira Project is a high-grade ionic adsorption clay (IAC) rare earth element project located in the Poços de Caldas region of Minas Gerais, Brazil. It is owned by Meteoric Resources NL.
How much did the Measured Resource increase?
The Measured Resource increased by 246%, rising from 37 Mt to 128 Mt.
What are the primary minerals found at Caldeira?
The project is rich in Total Rare Earth Oxides (TREO), with significant concentrations of magnetic rare earths including Neodymium (Nd), Praseodymium (Pr), Terbium (Tb), and Dysprosium (Dy).
Why are ionic clay deposits preferred over hard-rock deposits?
Ionic clays are typically easier and cheaper to mine because they are shallow, require no blasting or grinding, and use simpler chemical leaching for mineral recovery.
What is the total size of the resource?
The global Mineral Resource Estimate (MRE) for Caldeira is 1.6 billion tonnes at 2,317 ppm TREO.
