Meteoric Resources has expanded its Ore Reserve at the Caldeira Rare Earth Project in Brazil by 42%, underpinning over 20 years of production and reinforcing its Tier 1 status in the global rare earths market.
- Ore Reserve grows 42% to 146 million tonnes
- Contained TREO increases 24% to 517,000 tonnes
- Over 20 years production at 6Mtpa planned
- Low-cost ionic clay processing confirmed
- Early MOUs with key rare earth players
Ore Reserve Expansion Solidifies Caldeira's Long-Life Profile
Meteoric Resources Limited (ASX:MEI) has unveiled a substantial 42% increase in Ore Reserves at its wholly owned Caldeira Rare Earth Element Project in Brazil, lifting the reserve to 146 million tonnes at an average grade of 3,546 ppm total rare earth oxides (TREO). This upgrade supports a robust production profile exceeding 20 years at 6 million tonnes per annum, with contained TREO rising 24% to 517,000 tonnes, and magnetic rare earth oxides (MREO) reaching 126,000 tonnes.
The increase follows extensive infill drilling campaigns that converted significant Inferred Resources to Measured and Indicated categories, enhancing geological confidence. The company highlights that 28% of the Ore Reserve is now classified as Measured Resources, particularly from the Capão do Mel, Soberbo, and Figueira deposits, which were drilled at 50m by 50m spacing. This upgrade feeds directly into the imminent Definitive Feasibility Study (DFS), expected to provide greater operational and financial clarity.
Mining and Metallurgical Simplicity Underpin Cost-Effective Production
The Caldeira Project’s mining method involves open-cut extraction using trucks and excavators, targeting free-digging clay material without the need for drilling and blasting. Mining design incorporates conservative slope angles and a 5% unplanned ore loss, yielding a 95% mining recovery. Processing leverages the ionic adsorption clay mineralisation style, enabling low-cost, straightforward leaching with ammonium sulfate at mild acidity, producing a Mixed Rare Earth Carbonate (MREC) product.
Extensive metallurgical testing by the Australian Nuclear Science and Technology Organisation (ANSTO) and a continuous pilot plant in Brazil have confirmed recoveries consistent with DFS assumptions, with magnet rare earth oxide recoveries averaging 71% and recently reaching 80% over a sustained period. The process avoids complex beneficiation steps like flotation or roasting, a notable advantage over hard rock deposits.
Favourable Environmental and Infrastructure Settings
Located in Minas Gerais, the project benefits from proximity to established mining infrastructure, including paved and gravel roads, power supplied via a 29km 138kV transmission line under construction, and water sourced mainly from a nearby dam with high recycling efficiency. Environmental permitting is progressing, with a Preliminary License granted and the Installation License expected by the end of 2026. Mining activities are confined outside a protected ecological sanctuary, with operations permitted in the surrounding buffer zones.
Waste management plans eschew tailings dams in favour of progressive backfilling of mined pits with spent clay, minimising environmental footprint. The low acidity and inert nature of waste materials further reduce environmental risks.
Strategic Market Position and Early Industry Engagement
Caldeira’s MREC product is rich in critical magnet rare earths; neodymium, praseodymium, dysprosium, and terbium; key to electric vehicles, wind turbines, and advanced technologies. With global rare earth oxide demand exceeding 180,000 tonnes annually and expected supply shortages by 2030, the project is well positioned to diversify supply away from China, which currently dominates over 90% of global separation capacity.
Meteoric has secured non-binding Memoranda of Understanding with Ucore Rare Metals Inc. and Neo Performance Materials Inc., signalling strong early-stage interest from Tier-1 industry players. The company aims to convert these into binding offtake agreements during the DFS phase, supported by rigorous product qualification and alignment with downstream processing requirements.
Social Engagement and Community Relations
Meteoric has engaged extensively with local communities, indigenous groups, and municipal authorities in Caldas and surrounding areas, conducting over 50 meetings in 2024 alone. The company supports local social programs in education, sports, and culture, and maintains open communication channels including a dedicated WhatsApp line. These efforts aim to foster transparency and build social license ahead of project development.
The DFS incorporating this Ore Reserve update is the next critical milestone, expected to refine economic parameters, capital requirements, and market strategy. With environmental licensing advancing and pilot plant results underpinning processing assumptions, Caldeira is shaping as a globally significant, low-cost rare earth project poised to meet surging demand amid geopolitical supply chain shifts.
Bottom Line?
Meteoric’s Ore Reserve upgrade at Caldeira strengthens its position as a long-life, low-cost rare earth producer, but final project economics hinge on the upcoming DFS and binding offtake deals.
Questions in the middle?
- How will binding offtake agreements shape Caldeira’s financing and development timeline?
- What impact will evolving rare earth prices and geopolitical dynamics have on project economics?
- Can Meteoric secure the remaining environmental and mining licenses without delay?