Heavy Rare Earths Critical Minerals Discovery Transforms Radium Hill Project

Heavy Rare Earths Unlocks Major Critical Minerals Discovery at Historic Radium Hill

Heavy Rare Earths Limited (ASX: HRE) has announced a breakthrough Heavy Rare Earths critical minerals discovery that transforms its Radium Hill project from a single-commodity uranium play into a diversified critical minerals opportunity. The company's reconnaissance rock chip sampling programme has revealed an 8-kilometre Critical Mineral Corridor (CMC) containing high-grade scandium and yttrium alongside uranium, extending from Australia's historic first uranium mine.

The results demonstrate compelling potential: scandium grades up to 959ppm Sc2O3, yttrium up to 2,236ppm Y2O3, and uranium up to 3,597ppm U3O8 across multiple prospects spanning 5 kilometres from the original mine site. These findings arrive at a critical time when global demand for these strategic materials is surging across aerospace, electronics, and emerging technology sectors.

Historic Mine Site Reveals Modern Critical Minerals Treasure

HRE's systematic approach combined aerial geophysics with historical mining records to identify the 8km structural corridor running southwest to northeast through the original Radium Hill uranium mine. According to the announcement, this corridor corresponds to a regional fold's axial plane and has controlled critical mineral distribution throughout the region for over a century.

Furthermore, the geological insights provide compelling evidence of untapped potential:

• 50% of the corridor remains covered by soil and sediments, unexplored by modern methods
• Multiple historical workings date back to the early 20th Century, predating the main uranium mining period
• The Railway Prospect, just 100 metres from the historic mine, returned 0.36% U3O8, 253ppm Sc2O3, and 1.26% TREO
• Bonython Hill, 5km northeast of the mine, delivered the highest scandium grade of 959ppm Sc2O3

The announcement indicates that continuity of mineralisation across this distance suggests significant scale potential for this Heavy Rare Earths critical minerals discovery.

Multi-Element Critical Minerals System Emerges

The 33-sample programme tested historical workings and radiometric anomalies across five key prospects, revealing consistent critical mineral enrichment along the entire corridor length. In addition, the systematic occurrence demonstrates a cohesive mineralising system rather than isolated occurrences.

The systematic occurrence of scandium, yttrium, and rare earth elements alongside uranium strengthens the geological model for systematic exploration. Moreover, Chair Gabriel Chiappini highlighted the exploration potential, stating:

"We feel there is considerable potential for discovery from a suite of critical minerals in a historical mining camp which has not been tested by a single drillhole in the past 64 years."

Understanding Critical Minerals: Why Scandium and Yttrium Matter

Scandium represents one of the world's most valuable critical minerals, essential for aerospace aluminium alloys, fuel cells, and advanced ceramics. With global production under 25 tonnes annually, scandium commands premium prices and strategic importance for technological applications.

The metal strengthens aluminium alloys significantly while reducing weight, making it crucial for aerospace manufacturing. However, supply constraints continue to limit broader adoption across industries.

Yttrium has become increasingly critical for electronics, lasers, and superconductors. The metal serves as a key component in LED phosphors, ceramic capacitors, and high-temperature superconductors. Following significant price increases in mid-2024, yttrium represents a high-value target for resource development.

Both elements are classified as critical minerals by major economies including Australia, the US, and EU due to supply constraints and strategic importance for emerging technologies. China currently dominates global supply chains for both materials, creating strategic supply security concerns for Western economies.

Competitive Context: HRE's Scandium Grades Stack Up

HRE's rock chip results compare favourably to established scandium resources across the ASX, positioning the company among potential scandium developers following this Heavy Rare Earths critical minerals discovery. Furthermore, the surface grades suggest competitive potential pending systematic drilling.

HRE's surface rock chips returning up to 959ppm Sc2O3 suggest potential for competitive resource grades, though systematic drilling will be required to establish continuity and tonnage. The company's highest scandium grade exceeds three of the four established projects listed in the announcement.

Strategic Positioning and Development Plans

Chair Gabriel Chiappini emphasised the significance of discovering critical minerals at a location that has remained virtually unexplored by modern methods. According to the announcement, the structural corridor represents a geological extension of Australia's first uranium mine, where 954,000 tonnes of ore averaging 0.12% U3O8 were processed between 1954 and 1961.

Immediate development catalysts demonstrate the company's systematic approach:

• Systematic exploration strategy for 2026 to be announced
• Geological modelling led by Maptek founder Bob Johnson
• Research collaboration with University of Adelaide REE expert Professor Carl Spandler
• Target generation for maiden drilling programme

The company reports that towards the end of historical mining operations, approximately 135kg of scandium oxide was recovered on a pilot scale from residues, demonstrating prior extraction potential from the area.

Technical Approach and Geological Controls

The announcement details how recent re-evaluation of aerial geophysical data collected earlier in 2025 has further defined the 8km structural corridor. Analysis indicates this structure corresponds to the axial plane of a regional, domed anticlinal fold, with approximately 6km of this trend lying within HRE's project area.

However, significant exploration opportunities remain untested:

• Multiple prospects identified through historical data analysis
• Structural corridor controls critical mineral distribution
• Approximately 50% of strike length covered by soils and sediments
• No systematic drilling undertaken in the area for 64 years

Geological work has been supported by Bob Johnson, founder of Maptek, alongside concurrent studies at the University of Adelaide. The preliminary sampling programme was designed to test mineralised lode and unmineralised host rocks across historical workings and radiometric anomalies.

Investment Implications and Market Positioning

This Heavy Rare Earths critical minerals discovery positions HRE as a diversified critical minerals opportunity at one of Australia's most historically significant mining locations. The combination of established geological controls, modern analytical techniques, and untested exploration potential creates a compelling investment proposition.

Key tracking points for investors include:

• Scale potential: 8km corridor with 50% unexplored by modern methods
• Grade confirmation: Multiple prospects returning high-grade critical minerals
• Strategic timing: Critical minerals demand surge coinciding with exploration breakthrough
• Technical expertise: World-class geological team and university collaboration
• Drilling catalyst: First systematic drilling in 64 years expected in 2026

The company's recently refreshed board brings renewed focus to aggressive exploration across HRE's project portfolio. For instance, Radium Hill now stands as a priority target following these encouraging assay results.

What Makes This Discovery Strategically Important?

The timing of HRE's Heavy Rare Earths critical minerals discovery aligns with increasing global focus on critical mineral supply security. Western governments are actively seeking to diversify supply chains away from Chinese dominance in rare earth and critical mineral production.

Australia's position as a stable jurisdiction with established mining expertise makes projects like Radium Hill strategically valuable for both domestic and international supply security considerations. The project's location in South Australia, a mining-friendly jurisdiction with established infrastructure, adds to its development potential.

Critical mineral demand drivers continue to strengthen:

• Expanding aerospace sector requiring scandium-enhanced alloys
• Growing electronics manufacturing needing yttrium components
• Defence applications requiring secure supply chains
• Renewable energy technologies incorporating rare earth elements

Investment Takeaway

Heavy Rare Earths Limited has positioned itself as a major critical minerals opportunity in Australia's historically significant Radium Hill district. With systematic exploration planned for 2026 and potential for significant resource discovery in an area untested by modern methods, HRE represents one of the ASX's most compelling critical minerals stories following this breakthrough discovery.

The convergence of historical mining heritage, modern geological understanding, and critical minerals market dynamics positions HRE for potential significant value re-rating as systematic exploration advances through 2026. Moreover, the 8km corridor's scale potential combined with exceptional surface grades creates a compelling exploration story in the rapidly expanding critical minerals sector.

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