• Heavy Rare Earths has received the latest results from the expansion of its diagnostic leaching program at Cowalinya
  • These composites represent a broad range of feed grades, depths and magnet rare earth composition
  • More results are expected shortly


Special Report: Heavy Rare Earths has received results from the expansion of its diagnostic leaching program on rare earth mineralisation at the Cowalinya project near Esperance in WA.

Heavy Rare Earths (ASX:HRE) says the results over a large part of the Cowalinya rare earths (REE) resource have confirmed, and in some metrics exceeded, the results from last year’s sighter work.

Perth-based Strategic Metallurgy completed the sizing and diagnostic leach testing of 63 composites, with 57 of those from within the Cowalinya inferred resources (159Mt @ 870 ppm TREO) and the remainder from the project’s exploration target area (280-1390Mt @ 330-1,330ppm TREO).

The expanded program continues to deliver upgraded rare earth material by simple screening, “excellent” magnet rare earth extraction to leach (as high as 92.3%), and low acid consumption (as low as 3.8 kg/t).


Heavy Rare Earths asx HRE
Cowalinya metallurgical composites showing TREO extracted into solution. Pic via HRE


Solid foundation to larger-scale piloting

“We have demonstrated the efficient extraction of magnet rare earths, using modest volumes of commercial-grade acid, for many composite samples that represent a range of saprolite feed grades,” HRE executive director Richard Brescianini says.

“This data provides HRE with a solid foundation for leach optimisation test work, leading to larger-scale piloting and the analysis of the project from a commercial perspective.

“Our parallel workstream to produce mixed rare earth carbonate product has experienced delays associated with sample loss, assay turnaround and flowsheet modification.

“Nonetheless this program is nearing completion, and results are anticipated in the coming weeks.”




This article was developed in collaboration with Heavy Rare Earths, a Stockhead advertiser at the time of publishing.


This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.