Mount Ridley has lodged a second provisional patent application for an adapted Selectro chemistry targeting industrial metal feedstocks, following first-pass bauxite recoveries of 92% aluminium and 97% iron. Gallium results are still pending, and the process has not yet been optimised for bauxite.
- Second provisional patent application lodged for industrial metal feedstocks
- First-pass bauxite testwork recovered 92% aluminium and 97% iron
- More than 90% of silica remained in a small, pH-neutral residue
- Gallium assay results and bauxite optimisation remain outstanding
- Separate applications could be licensed or commercialised independently
Second Selectro patent targets industrial feedstocks
Mount Ridley Mines Limited (ASX:MRD) is extending its Selectro chemistry beyond its own rare earths project, lodging a second provisional patent application aimed at industrial metal feedstocks. The application was filed with IP Australia on 15 October by wholly owned subsidiary Mount Ridley Tech and covers a tuned version of the reagent molecule designed for different mineralogy and metal suites.
The move follows the first test of Selectro outside Mount Ridley’s Grass Patch Complex. A composite from Australian Silica Quartz Group’s Darling Range bauxite project returned 92% aluminium recovery and 97% iron recovery in ALS testwork, while more than 90% of the silica remained in a small, pH-neutral residue. Those are encouraging first-pass figures, but they are not yet evidence of an optimised or commercially scalable process.
Bauxite results widen the technology story
The new application sits alongside, rather than inside, Mount Ridley’s original Selectro filing, which covers the recovery of scandium, heavy rare earth elements and gallium from regolith-hosted feed such as Grass Patch. The company has previously reported Selectro recovery improvements but, in this filing, says the bauxite work represents the first test under its third-party program and a separate industrial application for the chemistry. The two intellectual property streams can therefore be progressed, licensed or partnered independently.
That distinction matters because the bauxite work shifts Selectro from a processing concept tied primarily to Mount Ridley’s own resource into a potential platform technology. The company says its objective is to recover aluminium, iron, gallium and titanium from bauxite rather than leave valuable metals in residue. Bauxite is also the main source of gallium, which is generally recovered as a by-product of alumina refining, according to the US Geological Survey reference cited in the announcement.
Gallium results will test the broader claim
The next technical checkpoint is the gallium assay from the bauxite leach solution, which requires a more sensitive method. Mount Ridley also plans to optimise the adapted chemistry for bauxite, test the underlying Selectro chemistry on additional third-party feedstocks and progress both provisional applications towards international filing under the Patent Cooperation Treaty.
A provisional application is an early step in protecting an invention, not a granted patent. The more consequential evidence will come from repeat and optimised testwork: whether recoveries hold across representative feedstocks, what happens to gallium and titanium, and whether reagent use, residue handling and process economics support a viable industrial pathway. Until those details emerge, the filing expands the addressable idea more clearly than it establishes a business.
Bottom Line?
The bauxite results strengthen Selectro’s platform narrative, but pending gallium data and process optimisation will determine whether that narrative can move towards licensing or industrial deployment.
Questions in the middle?
- What gallium recovery will the more sensitive assay show in the bauxite leach solution?
- Can the adapted chemistry maintain strong recoveries after optimisation and across additional industrial feedstocks?
- Will Mount Ridley secure a partner or licensee for either Selectro application before committing to larger-scale development?