The world can find rare earths. What it can’t do — at least not easily — is separate them.
Exploration headlines and resource estimates get the fanfare, but the choke point for Western rare earths is not mining. It’s metallurgy: the downstream, chemical-heavy process that turns crushed rock into the ultra-pure oxides needed for permanent magnets powering EV motors, wind turbines and advanced defence systems.
Today half of the world’s rare earths are mined outside China. But more than 85% of downstream processing still happens inside China. That means even when deposits are discovered in “friendly” jurisdictions, the value chain — and the leverage — sits somewhere else.
Rather than waiting for a downstream partner to appear, Great Northern Minerals Ltd (ASX:GNM) has moved upstream — securing exclusive access to a US-developed flotation technology that lifts recoveries to 80–90% at lower operating cost.
A tech partnership aimed at the real bottleneck
Great Northern announced last week that it has executed an exclusive patent option agreement with the University of Arizona, giving it first rights to license a new flotation process specifically designed for bastnaesite — the dominant rare earth mineral at Mountain Pass, the only producing rare earth mine in the United States.
This isn’t blue-sky R&D. Arizona’s technology has already been pushed to TRL-5 (lab-scale validation) using ore from MP Materials’ Mountain Pass Mine. The next step — supported by Great Northern — is advancing to TRL-6, which means a pilot-scale processing plant.
If successful, Great Northern gets a ready-to-run flowsheet directly applicable to its own Catalyst Ridge Project in the Mountain Pass district.
Here’s why this matters.
The tech: Flotation, but smarter
Most Western rare earth element (REE) developers still rely on oleic acid-based flotation systems, a decades-old approach that works — just not efficiently. It requires high reagent volumes, elevated temperatures, and still produces middling concentrate grades.
Arizona’s patented method is fundamentally different:
- Hydroxamic acid-based collectors — delivering superior selectivity for bastnaesite.
- 80–90% rare earth recovery and 30–40% REO concentrate grades.
- Up to 50% lower reagent consumption.
- Lower processing temperature (40–60°C) translating to reduced energy costs.
- Simplified flowsheet means fewer stages, lower complexity and less waste.
For investors, that combination of higher grade and lower operating expense equates to more viable project economics. For policymakers, it means a defensible Western processing route, not just another mine that ends up shipping concentrate into someone else’s value chain.
Tech = optionality, not just recovery
The US critical minerals conversation has shifted from resource security to processing sovereignty. It’s not enough to dig. A viable domestic refinery pathway is now the price of admission for Department of Defense, DOE and Inflation Reduction Act funding.
Great Northern’s agreement aligns with several practical advantages that matter for US critical minerals projects:
- collaboration with a US research institution;
- a technology already tested on ore from the Mountain Pass mine;
- work that fits within existing US downstream supply chain initiatives.
The move places the company inside the conversation about processing capability and domestic refining pathways — an area where most juniors are still on the sidelines.
Non-executive chairman Eddie King called it “a major step forward in unlocking the full value of Catalyst Ridge”.
“Given the current global significance of processing at the MP Materials Mountain Pass Mine, this collaboration is especially timely,” he added. “By leveraging world-class research and proven flotation innovations, we aim to significantly enhance REE recovery and reduce processing costs.”
The bigger signal for investors
In rare earths, the value is increasingly captured after the drill bit.
Tech that reduces reagent intensity, simplifies flowsheets and increases recoveries has outsized impact because:
- It determines capex/opex viability.
- It influences permitting (less waste, lower energy).
- It dictates eligibility for strategic investment.
Great Northern’s deal shows how juniors can punch above their weight: by buying time, not just drilling metres. The rare earth race may be won not by the biggest resource, but by the best flowsheet.