Key Highlights

  • Magnesium sulphate leach testing returned up to 1,062 ppm leachable TREO over 8.5m in hole EMA-TR-544.
  • Magnet rare earths averaged 43% of leachable TREO across 90 samples, reaching 46% in some intervals.
  • Dysprosium and terbium make up 2% to 6% of leachable TREO in basal samples.
  • The 55-hole infill program on a 100m by 100m grid is continuing, with 30 holes reported so far.

Brazilian Critical Minerals Limited (ASX:BCM) has reported magnesium sulphate leach assay results from 30 of 55 auger drillholes completed at Wellfield 1 of its Ema Ionic Rare Earth Project in Amazonas, Brazil. The announcement dated 11 November 2026 is part of a resource infill program on a 100m by 100m grid.

The leachable rare earth grades

Using a magnesium sulphate leach with results above 100 ppm, the company reported 8.5m at 1,062 ppm leachable TREO in EMA-TR-544, 8m at 1,019 ppm in EMA-TR-535, 10m at 912 ppm in EMA-TR-537 and 4m at 910 ppm in EMA-TR-507. Across the qualifying intervals in the 30 reported holes, the average leachable grade is about 510 ppm TREO across 219m of selected intervals.

Leachable TREO is the amount that can be extracted under the test conditions, which differs from total rare earth content measured by other methods.

Magnet rare earths and heavy elements

Magnet rare earths, comprising neodymium, praseodymium, dysprosium and terbium, averaged 43% of leachable TREO across 90 samples, reaching 46% in several selected intervals. Dysprosium and terbium were enriched towards the base of most holes, making up 2% to 6% of leachable TREO in basal samples. EMA-TR-537 returned 4m at 56 ppm combined dysprosium and terbium.

The company cited prices for dysprosium and terbium as reported by a rare earth price source in early November. The company used those prices to calculate the potential content per tonne, but this article does not assess any value.

Program progress and the testing still ahead

The company reported 30 of 55 holes so far, and the rest of the infill program is continuing. The leach results will feed into the resource estimate for the Ema Wellfield.

Leach tests on auger samples are an early stage of metallurgical assessment. Recovery, processing and cost questions remain to be answered in later work.

Final Word

Brazilian Critical Minerals has reported higher leachable rare earth grades and a magnet-rich composition at Wellfield 1, with dysprosium and terbium at the base of the holes. The remaining 25 holes, the resource update and further metallurgical testing will determine how much of this can be counted in a future estimate.