Heavy Rare Earths Maiden Drilling Programme Targets Prospect Hill Tin

Heavy Rare Earths Limited (ASX:HRE) is preparing to unlock the potential of South Australia's largest and most advanced tin project, with its heavy rare earths maiden drilling program at Prospect Hill now scheduled for early June 2026. The company has submitted its environmental protection plan and engaged a local drilling contractor for the 2,500-metre programme designed to establish the project's first mineral resource estimate.

The 24 reverse circulation holes and 5 diamond holes will test the South Ridge deposit, where historical drilling has already delivered impressive intersections including 5 metres at 3.22% tin. With tin prices surging nearly 20% year-to-date and reaching historically high levels, HRE's timing appears strategically advantageous for advancing this flagship asset.

Regulatory Approvals and Cultural Heritage Progress

The announcement reveals that HRE has successfully submitted an updated Program for Environment Protection and Rehabilitation (PEPR) to South Australia's Department for Energy and Mining, with a response anticipated within weeks. This regulatory milestone positions the company for imminent commencement of exploration activities.

In parallel, HRE is collaborating with the Dieri Aboriginal Corporation to conduct cultural heritage clearance surveys scheduled for early May. This partnership demonstrates the company's commitment to respectful engagement with traditional landowners and ensures all necessary cultural protocols are observed before drilling commences.

Chair Gabriel Chiappini commented: "Our collaboration with the Dieri Aboriginal Corporation on cultural heritage clearance surveys reflects our genuine commitment to respectful and constructive engagement with native title holders."

Furthermore, the announcement confirms that the company has engaged a South Australian-based drilling contractor, ensuring local expertise and logistics support for the upcoming programme.

Weather Delays Create Opportunity Amid Market Strength

According to the announcement, record rainfall across South Australia during Q1 2026 temporarily disrupted the original drilling timeline, with some regions receiving more than double their average annual rainfall within just two months. The exceptional weather caused widespread damage to regional access roads, affecting all sectors including mining and exploration.

However, the company reports that road conditions are rapidly improving as repairs progress, and HRE expects full access restoration in the near term. The delay, while initially challenging, coincides with increasingly favourable tin market dynamics that could enhance the project's economic potential.

Current Tin Market Highlights:

• +20% price gain year-to-date
• Supply risks in major producing regions (DRC, Indonesia, Myanmar)
• Rising electric vehicle demand driving consumption
• Expected supply deficit conditions

Understanding Reverse Circulation Drilling: A Primer for Investors

Reverse Circulation (RC) drilling represents one of the most cost-effective methods for mineral exploration, particularly suitable for initial resource definition programmes like HRE's heavy rare earths maiden drilling program.

How RC Drilling Works:
Compressed air forces rock chips up through the drill string, providing continuous samples every metre. This method proves faster and more economical than diamond drilling, making it ideal for testing large areas efficiently whilst gathering the data necessary for resource estimation.

Why This Matters for Investors:
RC drilling allows HRE to test extensive areas of the South Ridge prospect cost-effectively whilst gathering the data necessary for resource estimation. The planned 5 diamond holes will provide additional structural information and metallurgical samples, creating a comprehensive dataset for technical studies.

Key Terms for Understanding Exploration:

• Mineral Resource Estimate: Technical calculation of tonnage and grade based on drilling data
• Strike Length: Horizontal extent of mineralisation (500 metres identified at South Ridge)
• Metallurgical Testing: Laboratory work to determine processing characteristics and recovery rates

Project Foundation: Rich Historical Database and Strategic Location

According to the announcement, Prospect Hill spans 75 square kilometres across three exploration tenements located along the Curnamona Craton's northwestern margin. The project benefits from a substantial historical database including 56 drill holes and costeaning that has outlined mineralisation within a linear structural zone.

Historical Drilling Highlights:

• 5m @ 3.22% Sn intersection demonstrates high-grade potential
• 500-metre strike length defined at South Ridge
• Steeply dipping structural zone provides exploration target
• Polymetallic mineralisation in Palaeoproterozoic volcanic rocks

The announcement notes that HRE acquired comprehensive mineral rights to Prospect Hill in October 2025, positioning the company to advance the most prospective areas identified through decades of previous exploration work.

Upcoming Drilling Programme: Testing Resource Potential

The announcement details that the heavy rare earths maiden drilling program has been strategically designed to expand the known mineralisation model and provide data for resource estimation. The programme's dual approach combines efficiency with technical rigour.

Programme Structure:

1. 24 RC holes for broad area testing and resource definition
2. 5 diamond holes for structural understanding and metallurgical samples
3. Early June commencement following cultural clearance completion
4. Resource estimation focus based on expanded geological understanding

The company's longitudinal view of South Ridge shows clear zones for potential mineralisation extension, with drill hole placement designed to test these high-priority targets systematically.

Timeline Overview:

• Early May: Cultural heritage clearance surveys
• Coming weeks: PEPR approval anticipated
• Early June: Drilling commencement
• Q3 2026: Results and potential resource estimate

Investment Thesis: Positioned for Tin Market Upside

HRE's strategic positioning in the tin sector offers compelling investment characteristics as global supply-demand dynamics strengthen. The company's approach of advancing South Australia's largest tin project during a period of rising prices and supply constraints creates multiple value drivers.

Key Investment Drivers:

Market Timing Advantages:

• Tin prices at historically high levels
• Supply deficits emerging from major producing regions
• Electric vehicle growth driving demand acceleration
• Strategic metal classification supporting long-term demand

Project Quality Indicators:

• Historical high-grade intersections validate potential
• Substantial exploration database reduces technical risk
• Strategic location in mining-friendly South Australia
• Clear pathway to maiden resource estimation

Execution Capabilities:

• Experienced technical team with 35+ years expertise
• Local drilling contractor engagement ensures operational efficiency
• Strong regulatory and community relationships established
• Well-defined exploration strategy targeting near-term results

Why Investors Should Monitor Heavy Rare Earths Limited

HRE represents a focused approach to critical metals exploration during a period of exceptional market opportunity. The company's systematic advancement of South Australia's premier tin project, combined with favourable commodity dynamics, creates a compelling narrative for resource sector investors.

Near-Term Catalysts:

• PEPR approval (anticipated within weeks)
• Cultural clearance completion (early May)
• Drilling commencement (early June)
• Initial results (Q3 2026)
• Maiden resource estimate (potential Q4 2026)

Strategic Positioning:
The company's focus on a single, high-quality asset allows concentrated capital allocation and technical expertise application. Consequently, with tin prices responding to global supply concerns and demand growth, HRE's timing for resource definition appears strategically advantageous.

Chair Gabriel Chiappini noted: "South Australia's largest and most advanced tin project remains a flagship asset for HRE, and we look forward to updating shareholders as we use the drill bit to test and build upon historic data and quickly work toward a maiden tin resource estimate at Prospect Hill."

Tracking Rationale:
HRE offers exposure to the tin sector through a well-defined exploration programme on a proven prospect. The combination of historical validation, current market dynamics, and systematic exploration approach positions the company for potential value creation as drilling results emerge.

Heavy Rare Earths Limited has positioned itself as South Australia's leading tin exploration company, with significant upside potential driven by favourable market conditions and systematic project advancement. For instance, with drilling commencement planned for early June and multiple catalysts approaching, investors should monitor HRE's progress closely as the company works toward defining its maiden tin resource at the premier Prospect Hill project.

Ready to Explore Heavy Rare Earths Limited's Investment Potential?

With drilling scheduled to commence in early June and multiple near-term catalysts including PEPR approval and cultural clearance completion, Heavy Rare Earths Limited presents a compelling opportunity in the strengthening tin market. As the company advances South Australia's largest tin project during a period of rising commodity prices and supply constraints, savvy investors are positioning themselves ahead of potential resource definition results. Discover how HRE's systematic approach to critical metals exploration could fit into your investment strategy by exploring comprehensive company information and project updates at hreltd.com.au/investors/.