Morella Establishes 8,300t Rubidium Resource at Mt Edon
Key Takeaways
- Morella Corporation (ASX: 1MC) has delivered a maiden JORC 2012 Inferred MRE at Mt Edon totalling 5.44 Mt at 0.16% Rb₂O, containing approximately 8,300 tonnes of contained Rb₂O — prepared by independent specialist Snowden Optiro.
- The resource covers only two prospect areas, Sophie and Miles & June, within a broader 16 km² pegmatite system, with Sophie alone contributing 7,100 of the 8,300 tonnes of contained Rb₂O.
- Laboratory metallurgical testwork at Edith Cowan University achieved peak Phase 2 extraction of 93.6% Rb into solution, supporting amenability to hydrometallurgical processing, though commercial viability has not yet been established.
- Rubidium was added to the US 2025 Critical Minerals List, with the United States remaining fully import reliant — positioning Mt Edon's inventory within a constrained global supply context.
- Sophie has been drilled over only ~600m of an interpreted 1.2km strike extent, and numerous mapped pegmatites north of Sophie remain untested, pointing to material resource growth potential from the next drilling phase.
Mt Edon maiden resource estimate establishes ~8,300 tonnes of contained Rb₂O
Morella Corporation (ASX: 1MC) has delivered its maiden JORC 2012 Inferred Mineral Resource Estimate (MRE) at the Mt Edon Critical Minerals Project in Western Australia, establishing a technical foundation for what the company describes as one of the larger reported Australian rubidium inventories. The estimate totals 5.44 Mt @ 0.16% Rb₂O, containing approximately 8,300 tonnes Rb₂O, reported at a 0.10% Rb₂O cut-off and prepared by independent specialist Snowden Optiro. Critically, this figure covers only two prospect areas, Sophie and Miles & June, within a substantially broader mapped pegmatite system.
A maiden MRE is the first formal technical benchmark for an exploration asset. It converts drill results into a reportable inventory under the industry’s most rigorous standard (JORC 2012), marking the transition from explorer to resource-holder. The MRE also contains approximately 3,600 tonnes Li₂O at 0.07% Li₂O, though lithium and tantalum have not been assigned economic contribution in the Reasonable Prospects for Eventual Economic Extraction (RPEEE) assessment at this stage.
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Breaking down the Mt Edon resource
MRE by prospect
The MRE is split across two prospects, with the Sophie area contributing the majority of the inventory.
| Prospect | Category | Tonnes (Mt) | Rb₂O (%) | Contained Rb₂O (t) |
|---|---|---|---|---|
| Sophie | Inferred | 4.50 | 0.16% | 7,100 |
| Miles & June | Inferred | 0.94 | 0.13% | 1,200 |
| Total | Inferred | 5.44 | 0.16% | 8,300 |
It is worth noting that the RPEEE assessment attributes no economic contribution to associated lithium or tantalum. These elements represent potential additional value, subject to future metallurgical testwork demonstrating recoverability and subsequent economic assessment. They are not factored into the current resource economics.
Near-surface geometry and higher-grade domains
The mineralisation at Mt Edon outcrops or occurs close to the surface, and the pegmatites dip at approximately 30° to the east. This shallow, near-surface geometry is considered amenable to conventional open-pit mining methods, keeping early-stage development economics within a practical range. The broader pegmatite footprint extends across approximately 16 km², with sensitivity analysis at higher Rb₂O cut-off grades demonstrating increasing average grade while retaining meaningful contained Rb₂O inventory. This points to higher-grade optionality within the broader MRE envelope rather than representing a separate resource.
What is rubidium and why does it matter?
Rubidium is a rare alkali metal that typically forms within highly fractionated lithium-caesium-tantalum (LCT) pegmatites. It is not a commodity most investors will have encountered, but its applications span several critical and high-value technology sectors:
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Specialty glass and fibre optic systems
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Advanced electronics
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Atomic clocks and frequency-control devices
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Biomedical applications
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Defence-related technology
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The United States added rubidium to its 2025 Critical Minerals List and remains fully import reliant for rubidium minerals
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Global supply is constrained, with production occurring mainly as a by-product from a relatively small number of mineral sources
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Unlike established bulk commodities, rubidium does not have a widely quoted transparent benchmark price; commercial value depends on product form, purity, specification and transaction volume
The significance of the Mt Edon MRE, then, is not determined by headline grade alone. What matters is the approximately 8,300 tonnes of contained Rb₂O, the recoverability of that rubidium, and the company’s ability to establish a commercially viable processing route and downstream customer base. That is what makes the metallurgical results from laboratory testwork so material to the investment case.
93.6% rubidium extraction achieved in laboratory testwork
Metallurgical testwork at Edith Cowan University’s Mineral Recovery Research Centre (MRRC) has demonstrated encouraging early-stage extraction performance. Phase 1 peak extraction reached 89.3% Rb into solution, with Phase 2 achieving 93.6% Rb into solution.
It is important to frame these results accurately. The announcement is explicit: these figures represent laboratory-scale extraction and do not establish overall process recovery or commercial viability. For the RPEEE assessment, an overall Rb process recovery of 68% has been assumed, reflecting modelled recovery through beneficiation, leaching and purification combined. The processing pathway being advanced is a Direct Rubidium Extraction method (hydrometallurgical). Ongoing work will focus on extraction optimisation, purification and flowsheet development, with Morella continuing its collaboration with Edith Cowan University.
Significant resource growth potential remains
The current MRE covers only the drilled portions of Sophie and Miles & June within a much broader system. Sophie has been drilled over approximately 600m of strike out of an interpreted total strike extent of up to 1.2km. Miles & June has been drill-tested over approximately 250m. The MRE database contains 51 RC drillholes totalling 3,588m, and mineralisation remains open along strike and at depth in multiple directions.
Morella’s immediate next steps will include:
- Additional infill and step-out drilling at Sophie and Miles & June to test extensions and improve confidence in the geological and grade models
- Targeted diamond drilling to improve structural and geological understanding, provide representative density and metallurgical samples, and assess internal pegmatite zonation
- Continued metallurgical testwork to confirm the mineralogical deportment and recovery characteristics of rubidium, lithium and tantalum, and to refine potential processing pathways
- Expansion of density measurement coverage across the principal lithological and weathering domains
- Continued geological mapping, geochemical evaluation and target generation across the broader Mt Edon tenure package
Numerous mapped pegmatites north of Sophie have not yet been systematically drill-tested, and surface geochemistry across the broader tenure provides additional targets for follow-up exploration.
MD James Brown on the Mt Edon milestone
James Brown, Managing Director, Morella Corporation
“This maiden MRE is an important milestone for Mt Edon and establishes a substantial initial rubidium inventory of approximately 8,300 tonnes of contained Rb₂O from only the Sophie and Miles & June areas. Importantly, we do not see Mt Edon as simply a headline grade story. The scale of the mineralised system, its shallow and near-surface geometry, the contained rubidium inventory and, ultimately, our ability to efficiently recover the rubidium and produce a saleable product are all important in understanding the potential of the Project…”
Brown’s framing is deliberate: the MRE is not a grade story but a scale and recoverability story. He also noted “considerable scope to grow the MRE,” with the next work phase focused on expanding the estimate, defining higher-grade domains, and advancing the metallurgical programme.
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Investment thesis: from exploration to resource-holder
The maiden MRE positions Morella as a resource-holder in a critical mineral with constrained global supply. Four pillars underpin the investment case as it stands:
- Substantial inventory established: Approximately 8,300 tonnes of contained Rb₂O provides a meaningful starting point for a critical mineral not produced domestically in the US and subject to constrained global supply
- Shallow geometry: Near-surface, open-pittable mineralisation keeps early-stage development economics within a practical range, with a shallow ~30° dip and low expected stripping ratio
- Metallurgical progress: Laboratory-scale extraction of up to 93.6% Rb into solution supports amenability to hydrometallurgical processing, though further testwork is required to confirm commercial recoverability
- Significant upside: The MRE covers only two areas of a broader 16 km² pegmatite system, with resource growth drilling the immediate catalyst
Morella’s broader critical minerals portfolio spans lithium, rubidium and titanium across Tier 1 Australian and US jurisdictions, providing additional strategic context for the company’s positioning in the sector.
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