Mount Ridley Mines Rare Earth Discovery Delivers 123Mt World-Class Resource

Mount Ridley Delivers Massive 123Mt Heavy Rare Earth Resource – One of the World's Largest Regolith-Hosted Systems

Mount Ridley Mines has announced a game-changing 122.54Mt @ 889 ppm TREO Mineral Resource Estimate, establishing the Mount Ridley Mines rare earth discovery as one of Australia's most significant critical minerals discoveries. With a premium 41% heavy rare earth ratio and strategic positioning near Esperance infrastructure, this resource represents a major step toward establishing Australia as a key supplier in the global rare earth supply chain.

Resource Highlights Showcase World-Class Scale and Quality

Mount Ridley's new Mineral Resource Estimate demonstrates exceptional scale across two distinct blocks. The comprehensive assessment reveals the substantial nature of this Mount Ridley Mines rare earth discovery.

Block 1 (Central Zone) contains 35.36Mt @ 746 ppm TREO with 26,366t TREO metal. Furthermore, it holds 10,783t contained Heavy REE oxides with high-grade zones featuring individual samples exceeding 3,950 ppm TREO.

Block 2 (Northern Zone) presents 87.18Mt @ 947 ppm TREO containing 82,588t TREO metal. In addition, this zone hosts 33,827t contained Heavy REE oxides with a superior grade profile and extensive high-grade continuity.

The resource contains 4,272 tonnes of dysprosium and 719 tonnes of terbium. These represent some of the most strategically critical elements in the global transition to clean energy technologies.

Understanding Heavy Rare Earths: The Premium End of Critical Minerals

What Are Heavy Rare Earth Elements (HREE)?

Heavy rare earth elements represent the premium segment of the rare earth market due to their unique magnetic properties and supply constraints. Unlike light rare earths, HREEs are essential for high-performance applications where standard magnets cannot operate effectively.

Dysprosium enables magnets to function at elevated temperatures (up to 200°C) without losing magnetic strength. Terbium dramatically increases magnetic coercivity, allowing smaller, more powerful magnets.

Supply concentration in Chinese ionic clay deposits creates structural supply risks. Moreover, growing demand from electric vehicle motors, wind turbine generators, and defence applications continues to intensify.

The Mount Ridley Mines rare earth discovery features a 41% HREO ratio that significantly exceeds typical rare earth deposits. Most deposits average 15-25% heavy rare earth content, making this enrichment translate directly into higher potential revenue per tonne of ore processed.

Multi-Commodity System Creates Unique Value Proposition

The Mount Ridley project hosts rare earths alongside significant scandium and gallium resources within the same regolith profile. This creates exceptional synergy opportunities for integrated development.

Co-Located Resources include:

• 367.98Mt @ 57.3 ppm Scandium (existing resource)
• 838.7Mt @ 29.3 ppm Gallium (existing resource)
• 122.54Mt @ 889 ppm TREO (new resource)

This polymetallic system offers exceptional development advantages through shared infrastructure and processing pathways. Additionally, it provides enhanced project economics through multiple revenue streams and risk diversification across multiple critical minerals markets.

"The delivery of a JORC (2012) Inferred REE Mineral Resource of 122.54Mt at 889 ppm TREO represents another defining milestone for Mount Ridley Mines and firmly positions the Mount Ridley Project among the most significant rare earth and critical mineral regolith-hosted deposits in Australia," stated Allister Caird, Managing Director & CEO.

Metallurgical Progress Demonstrates Processing Potential

Mount Ridley's metallurgical testwork has achieved encouraging rare earth recovery rates across multiple prospects. The results demonstrate the technical viability of extracting valuable heavy rare earths from the regolith-hosted system.

Heavy Rare Earth Recovery Results

Up to 86.5% HREE recovery has been achieved at Winston's Prospect. Furthermore, average ~50% HREE recovery has been demonstrated across multiple prospects with up to 85% magnet REE recovery at Vincent Prospect.

The testwork demonstrates multiple metallurgical pathways. Some areas show exceptional heavy rare earth extraction whilst others excel in magnetic recovery, providing operational flexibility and optimisation opportunities.

Key Processing Advantages include:

• Simple acid leach processing using readily available hydrochloric acid
• Beneficiation potential through screening to concentrate rare earths
• Established clay processing techniques applicable to regolith-hosted systems
• Shallow, near-surface mineralisation suitable for low-cost open pit mining

Exceptional Growth Potential Across 1,000km² Project Area

The Mount Ridley Mines rare earth discovery represents only the beginning of the project's potential. More than 80% of the 1,000km² tenure package remains untested for rare earth mineralisation.

Immediate Expansion Opportunities

Block 1 Extensions feature an 11km southwest strike extension identified through geophysics. There is 6km width potential for resource expansion with open-ended mineralisation requiring systematic drilling.

Block 2 Growth Targets include a 4.35km eastern extension with strong geophysical signatures. Additionally, there is a 4.3km western extension along structural corridors and a 3km gap between blocks requiring infill drilling.

Seven High-Priority Target Zones span a 63km structural corridor with coincident scandium-gallium-REE signatures. Multiple aligned prospects follow deep-crustal fluid conduits with geophysically defined targets providing clear drilling priorities.

The geological continuity observed across existing resources strongly suggests the 63km Grass Patch Complex could host multiple large rare earth deposits once systematically explored.

Strategic Positioning in Critical Minerals Supply Chain

Mount Ridley's location 25km northeast of Esperance provides exceptional infrastructure advantages for future development. The proximity to established facilities significantly reduces development risks and costs.

Infrastructure Benefits

The Port of Esperance serves as an established bulk commodity export facility. Sealed road access connects to site and processing facilities, whilst power grid connectivity enables processing operations. The region benefits from a skilled mining workforce in an established mining area.

Market Positioning Advantages

Australia represents an allied jurisdiction providing supply chain security for Western nations. The project offers potential to supply electric vehicle manufacturers, wind turbine producers, and defence contractors.

This creates a diversification opportunity away from Chinese-dominated supply chains. Furthermore, Western Australia's established reputation as a reliable mining jurisdiction enhances the investment proposition.

The Australian Government's A$1.2 billion Critical Minerals Strategic Reserve specifically identifies rare earth elements as priority materials for strategic stockpiling. This highlights the growing recognition of these materials' strategic importance.

Investment Thesis: Positioning for the Critical Minerals Super-Cycle

The Mount Ridley Mines rare earth discovery represents a compelling investment opportunity in the critical minerals sector. The combination of scale, quality, and strategic positioning creates a unique value proposition.

Scale Advantages

Mount Ridley hosts one of the world's largest regolith-hosted HREE resources. The 122.54Mt resource provides decades of potential mining inventory through a multi-commodity system that reduces development risk and enhances returns.

Quality Profile Benefits

The 41% heavy rare earth ratio significantly exceeds industry averages. 4,272t dysprosium and 719t terbium target the highest-value market segments with premium positioning in supply-constrained heavy rare earth markets.

Development Advantages

Shallow, near-surface mineralisation suits low-cost open pit mining. Established metallurgical pathways show encouraging recovery rates with excellent infrastructure access near major port facilities.

A supportive regulatory environment exists in a stable jurisdiction. However, the most compelling aspect remains the growth potential with 80% of tenure untested for rare earth mineralisation.

Next Steps: Advancing Toward Development

Mount Ridley's immediate focus centres on resource expansion and metallurgical optimisation. The company has outlined comprehensive work programmes for 2026.

2026 Work Programmes

Targeted drilling will focus across the 12.8km eastern trend adjacent to existing blocks. Metallurgical studies will optimise heavy rare earth recovery processes whilst resource definition drilling upgrades confidence categories.

Geophysical surveys will define additional target zones. Moreover, combined processing approaches will incorporate scandium and gallium as by-products.

Partnership discussions with international rare earth processors are progressing. Flow sheet optimisation for regolith-hosted critical mineral systems continues alongside scoping study preparation for integrated development approaches.

Why Investors Should Track Mount Ridley Mines

Mount Ridley has established itself as a premier critical minerals development company with world-class resource endowment. The exceptional growth potential creates compelling investment opportunities.

Key Investment Drivers

Massive scale resources provide long-term development optionality. Premium grade profiles target highest-value heavy rare earth markets whilst multi-commodity systems offer diversified revenue streams.

Strategic location provides excellent infrastructure access. Furthermore, substantial exploration upside exists across largely untested tenure.

Unique Market Position

The Mount Ridley Mines rare earth discovery combined with existing scandium and gallium resources creates a genuinely multi-element critical minerals system. This capability enables supplying multiple strategic supply chains from a single operation.

With global rare earth demand projected to grow exponentially through the clean energy transition, Mount Ridley's world-class resource base positions the company. It could become a major supplier in the emerging critical minerals economy.

Mount Ridley Mines has established one of the world's largest regolith-hosted heavy rare earth resources, positioning the company as a potential cornerstone supplier in the global critical minerals supply chain. With exceptional resource scale, premium heavy rare earth grades, and substantial expansion potential, Mount Ridley represents a compelling opportunity for investors seeking exposure to the clean energy transition's most strategic materials.

Looking for Exposure to Critical Minerals Discoveries?

Discovery Alert's proprietary Discovery IQ model delivers instant notifications when significant ASX mineral discoveries like Mount Ridley's massive rare earth resource are announced, ensuring subscribers can capitalise on actionable opportunities ahead of the broader market. Begin your 14-day free trial today and gain the market-leading advantage needed to position yourself at the forefront of the critical minerals super-cycle.