Heavy Rare Earths Limited

Cowalinya Re-Assay Program Confirms Rare Earth Grade Increase

Heavy Rare Earths Limited (“HRE” or “the Company”) is pleased to report final results from its Analytical (Re-Assay) Program, in which 729 two-metre composite samples from 102 air core holes drilled at its Cowalinya rare earth project in 2021 were re-assayed using Lithium Borate Fusion/ICP-MS.
  • Re-assaying of samples above the Cowalinya resource cut-off grade delivers an average increase of 3.8% in total rare earths
The program has delivered a length-weighted average grade in total rare earth oxides (“TREO”) of 856 ppm for samples where the original analytical work by 4-Acid Digest/ICP- MS (on largely four-metre composites) returned assays above 300 ppm TREO-CeO2, the cut-off grade for the project’s Inferred Mineral Resources of 28 million tonnes @ 625 ppm TREO1 hosted in clay-rich saprolite.

This represents a 3.8% increase in grade over the original assays which average 825 ppm (Table 1) in contrast to the more modest resource grade of 625 ppm that includes significant dilution in the grade estimate.

HRE earlier reported interim results from 67 two-metre composites from 16 holes drilled mainly in the southern part of the Cowalinya South resource (refer to ASX announcement 4 October 2022). For these samples a length-weighted average increase in TREO grade of

14.8% over the original assays was presented. The difference between that interim and this final (3.8% increase) result is likely due to spatial and compositional variation in rare earth- bearing phases across the resource, potentially linked to basement litho-types and long-lived weathering processes. This variation is being further investigated by HRE in the context of its metallurgical program.

The results from the Analytical (Re-Assay) Program confirm routine two-metre sample compositing for assay by Lithium Borate Fusion/ICP-MS (‘total digest’) as the basis for future grade estimation of rare earth mineralisation from the Company’s ongoing resource exploration and expansion drilling program at Cowalinya. Several batches of saprolite and end-of-hole basement samples from the drilling program have been delivered to LabWest Minerals Analysis in Perth for assay, with first results expected to be reported next month.


Click here for the full ASX Release

This article includes content from Heavy Rare Earths Limited, licensed for the purpose of publishing on Investing News Australia. This article does not constitute financial product advice. It is your responsibility to perform proper due diligence before acting upon any information provided here. Please refer to our full disclaimer here.

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