Mount Ridley’s scandium story moves from resource growth to processing optionality

Mount Ridley Mines is developing two linked parts of its Grass Patch story: a growing scandium resource and Selectro, a proprietary processing route. Cashu Research rates the stock a Speculative Buy with an A$0.144 price target, versus a last close of A$0.039 as at 7 October 2026, implying about 269% upside. The risk rating remains high.

Phase 2 re-assays found shallow scandium mineralisation extending as far as 8km beyond the existing Block 1 and Block 2 resource boundaries. Highlights included 40m at 102.1ppm Sc₂O₃ from 18m in MRAC1040 and 22m at 119.4ppm from 12m in MRAC1036. Another hole, MRAC1052, returned 13m at 124.6ppm from 16m.

These results sit outside the current resource model, but their grades are above the Block 1 and Block 2 resource averages of 77.3ppm and 74.7ppm Sc₂O₃. The mineralisation is generally shallow and commonly runs to the base of the weathered profile, meaning the reported depth is mainly controlled by the regolith rather than the drilling limit.

The existing Inferred Mineral Resource is 946Mt at 50.1ppm Sc for 47,357t of contained scandium. Phase 2 results have not yet been modelled into that estimate. A further 2,800 Phase 3 pulps reached the laboratory on 21 September 2026, with the company describing the wider programme as midway through its work.

The attraction is that Mount Ridley is re-assaying stored material from earlier drilling rather than relying entirely on new drilling. Phase 1 re-assays supported the increase in the resource from 368Mt to 946Mt without a drill rig. The next potential catalyst is an updated resource model that incorporates the Phase 2 results and assesses whether part of the Inferred resource can be lifted to Indicated.

Selectro’s bench results have improved materially across three tests, lifting scandium recovery from 62.1% to 80.0% and then 91.8%. Heavy rare earth recovery averaged 84% in Test 3. The test was conducted at atmospheric pressure and low temperature, using half the reagent dose applied in Tests 1 and 2.

The peer comparison is important because established scandium routes generally rely on more intensive heat, pressure or acid conditions. The report’s comparison table lists 88% recovery for Sunrise Energy Metals’ Syerston HPAL route, 70–80% for the Nyngan HPAL route and about 75% for Nyngan’s acid-bake route. Selectro’s 91.8% result therefore stands out on recovery and process intensity, although the comparisons are not directly equivalent.

The main limitation is the scale and nature of the test. Selectro results are initial laboratory-scale work on unbeneficiated composite material, using approximately 90g aliquots from one 16.8kg composite. The reagent chemistry is undisclosed, and the reported leach recovery is not the same as recovery to saleable oxide. Impurities, downstream separation and product quality remain unreported.

Gallium also moved in the opposite direction, falling to 41.5% at the lower reagent dose. That suggests the eventual process may involve a trade-off between recovering scandium and recovering other critical minerals. A further test on third-party ore would be a more meaningful validation than another result from the same Grass Patch composite.

Selectro could have value beyond Mount Ridley’s own project because potential feed sources include titanium and nickel by-product liquors, red mud, nickel laterite tailings and other Australian clay-hosted rare earth deposits. However, the note identifies four requirements before the technology can carry meaningful commercial value: third-party feed, bulk or pilot-scale validation, a workable commercial model and stronger intellectual-property protection.

The current protection is a provisional filing, with an international filing deadline in August 2027. A future partner could pursue a royalty, collaboration or joint-venture structure, but a licensee would need confidence that the process works on different ore types and can produce a saleable product at larger scale. The report treats a single announced third-party trial as the point at which Selectro would begin to carry value in its numbers.

The broader policy argument is that mining outside China does not fully solve supply-chain risk if the ore still has to be separated or refined in China. The US–China trade truce was extended only to 10 January 2027, while the April 2025 licensing controls on heavy rare earths and scandium remained in force.

Western funding is increasingly directed toward processing as well as mining. The report highlights a conditional commitment of up to US$400m in 25-year debt from the Office of Strategic Capital for Sunrise Energy Metals’ Syerston project, alongside Australia’s Critical Minerals Production Tax Incentive, which refunds 10% of eligible processing costs from July 2027 to June 2040. Australia also has a A$1.2bn Strategic Reserve and a A$5bn Critical Minerals Facility.

That backdrop gives Selectro a strategic angle: Australian-owned processing IP for metals subject to Chinese controls could potentially be licensed to a project in Japan, Europe or the United States. But policy support does not remove the technical risks, and a supportive market does not guarantee that a licensee will emerge.

The A$0.144 target applies A$4,000 per tonne of contained scandium to the 47,357t in the current JORC estimate. The report expects the target to rise if Phase 2 re-assays are successfully modelled into an updated resource, but that expectation is conditional and is not a forecast of the resource outcome.

The near-term work programme includes flotation testwork, bulk testwork, scoping work, continued re-assaying and validation of Selectro on third-party feed. Mount Ridley reported A$1.89m of cash at 30 June 2026 and completed a A$2.0m placement in September. The note says those funds support flotation, bulk testwork and scoping rather than a pilot plant.

For investors, the opportunity is therefore highly dependent on execution. Resource growth must become a formal estimate, Selectro must move beyond one composite and laboratory scale, and the provisional IP must develop into a licensable protection strategy. Until those milestones are met, the target reflects a speculative pathway built around resource expansion and processing optionality rather than a demonstrated commercial operation.