• Drilling at Mount Ridley’s namesake project confirms the continuity of high-grade clay hosted rare earths
  • Grades frequently exceeded 1,200ppm TREO, with mineralisation ranging between 6m- 41m true thickness
  • Drilling will resume at Mia shortly and 7,500m is planned before Christmas, with holes drilled on a 400m x 400m grid


New assays confirm the continuity of high-grade (>700ppm TREO) clay-hosted rare earth element (REE) mineralisation at the Mia prospect, with more drilling on the way.

Mount Ridley’s (ASX:MRD) namesake project in WA’s Fraser Range sub-basin, initially acquired for its nickel and copper sulphide potential, is now recognised as being prospective for clay REE deposits.

The 3,400km2 project is in a region shown to have high percentages of high value neodymium and praseodymium (NdPr) dysprosium and terbium, which are used in the production of permanent magnets for electric vehicles and wind turbines.

Mount Ridley’s focus has been the 9km long, 4km wide Central Mia prospect – one of 11 at the project – which it has been drilling since the July quarter.


High-grade results as drilling tests swarm of clay units

New drill results confirm the continuity of thick, high grade and magnet REE rich mineralisation between previously announced drilling, which was drilled on 400m spacings.

These 157 new holes, drilled at tighter 100m spacings, pulled up intervals with grades frequently exceeding 1,200ppm TREO and mineralisation ranging between 6m and 41m true thickness at an average of 12m.

Best intersections include:

  • 22m at 2,160ppm TREO from 11m;
  • 26m at 1,780ppm TREO from 30m;
  • 18m at 1,386ppm TREO from 9m; and
  • 6m at 5,374ppm TREO from 24m.


Mineralisation continuity as drilling readies again

Mount Ridley chairman Peter Christie says these results tick another important box as the company advances the project.

“The results confirm mineralisation continuity between the drill holes,” he says.

“Other highlights achieved this year include the many high grade, thick intersections of REE mineralisation at Mia, a projected grade upgrade of approximately 160% through screening of Mia samples, and the efficacy of HCl to leach REE’s into solution.

“Drilling will resume at Mia shortly and 7,500m is planned before Christmas, with holes drilled on a 400m x 400m grid.”

Meanwhile, the company has engaged with South Australian process engineering group WGA, a company which has expertise with clay-hosted REE mineralisation.

WGA is tasked with proposing a flow sheet, test work for each of the stages, and capital and operating cost estimates for each stage.



This article was developed in collaboration with Mount Ridley Mines, 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.