Estrella Resources Manganese Discovery Delivers World-Class 58% Grades

Estrella Resources Delivers World-Class Manganese Grades at Ira Miri Discovery

Estrella Resources Limited (ASX: ESR) has announced exceptional manganese drilling results from its Ira Miri prospect in Timor-Leste, with grades reaching 58% manganese – among the highest recorded in global stratiform deposits. The latest assays from 12 drill holes confirm the discovery of a significant high-grade manganese system with characteristics comparable to world-class deposits.

Outstanding High-Grade Results Confirm Major Discovery Potential

According to the report, the drilling programme has delivered spectacular results across multiple holes, with 10 out of 12 holes intersecting significant mineralisation. The standout intersections include:

Key Drilling Highlights:

• EMDD030: 1.10m @ 52.6% Mn, including 0.4m @ 58.02% Mn
• EMDD026: 3.00m @ 35.7% Mn, including 1.5m @ 55.1% Mn
• EMDD033: 11.97m @ 28.9% Mn, including 2.1m @ 46.8% Mn
• EMDD031: 4.00m @ 25.7% Mn, including 1.05m @ 49.6% Mn

Furthermore, the results demonstrate an approximate average grade of 35% manganese across mineralised intervals, with exceptionally low impurities that enhance the deposit's economic potential.

Managing Director Commentary

"Ira Miri continues to deliver exceptional grades, with results that rival those seen in some of the world's best sedimentary manganese deposits. The continuity of grades above 50% Mn, combined with exceptionally low impurity levels, positions Ira Miri as a strategic and potentially high-value discovery." – Chris Daws, Managing Director

Understanding Stratiform Manganese Deposits

Stratiform manganese deposits form in marine sedimentary environments and represent some of the world's largest manganese resources. These deposits develop through the precipitation of manganese from seawater onto the ocean floor, creating laterally continuous beds of high-grade mineralisation.

Key characteristics that make these deposits attractive:

• Consistent grade distribution across large areas
• Predictable geology enabling efficient mining
• High-quality manganese suitable for premium applications
• Low strip ratios due to near-surface occurrence

The Ira Miri deposit exhibits all these favourable characteristics, positioning it alongside globally significant deposits like Mexico's Molango and Australia's Groote Eylandt operations.

Moreover, these formations occur when manganese-rich solutions precipitate from ancient seawater, creating layered deposits with remarkable grade consistency across extensive areas.

Exceptional Mineralogy Rivals World-Class Deposits

The composition analysis reveals Ira Miri's manganese mineralisation possesses the hallmarks of premium-quality stratiform deposits. The high-silica, low-iron characteristics match those found in the world's largest manganese operations.

In addition, the exceptionally low phosphorus content of 0.04% is particularly significant, as phosphorus is a deleterious element in steel production. This positions Ira Miri's manganese as suitable for premium metallurgical applications.

High-silica, low-iron manganese deposits like Molango (Mexico) and Groote Eylandt (Australia) are among the world's most valuable manganese resources due to their consistent grade and favourable metallurgy.

Drilling Programme Reveals Extensive Mineralised System

The report outlined that Estrella has completed 45 diamond drill holes totalling 1,532.50 metres at Ira Miri, with 29 holes passing through the manganese-bearing Noni Formation. The systematic drilling has outlined a folded bed of manganiferous cherty mudstone with shallow northward dip.

Drilling Statistics:

• Total holes completed: 45
• Total metres drilled: 1,532.50m
• Holes in target formation: 29
• Significant intersections: 16 holes
• Success rate: 55% of holes in formation

However, the mineralisation presents as a coherent geological unit with excellent continuity, suggesting significant expansion potential along strike and at depth.

What Makes Manganese a Strategic Investment Opportunity?

Manganese is essential for steel production, with no substitute for its role in steelmaking. Approximately 90% of manganese is used in steel production as a deoxidising and desulfurising agent.

Key Market Drivers:

• Global steel demand continues growing, particularly in developing markets
• High-grade deposits command premium pricing
• Supply concentration in few major producers creates opportunity
• Battery applications emerging as new demand driver

For instance, the exceptional grade and low impurity profile make Ira Miri particularly attractive for metallurgical applications requiring high-quality feedstock. This positions it to supply premium markets, potentially commanding significant price premiums over lower-grade ores.

Upcoming Catalysts and Development Timeline

Immediate Next Steps:

• Final batch of assays imminent from remaining drill holes
• Werumata Limestone drilling nearing completion
• Sample export for comprehensive analysis
• Resource estimation planning following complete results

Medium-Term Milestones:

• Extended drilling programme to test strike extensions
• Metallurgical test work to confirm beneficiation potential
• Preliminary economic assessment of development scenarios
• Additional prospect testing across broader tenement package

Geological Expansion Potential

The Noni Formation extends across multiple locations in Timor-Leste with minimal modern exploration completed. Estrella considers the possibility of significant volumes of high-grade manganese mineralisation to be high across its broader tenement package.

Why Should Investors Watch Estrella Resources?

Compelling Investment Characteristics:

1. World-Class Grade Discovery – Results comparable to globally significant deposits
2. Early-Stage Opportunity – Minimal historical exploration in highly prospective region
3. Multiple Exploration Targets – Extensive tenement package with numerous prospects
4. Experienced Management – Proven track record in resource discovery and development
5. Strategic Location – Timor-Leste offers stable political environment and mining-friendly jurisdiction

Unique Competitive Advantages:

• First-mover advantage in underexplored Timor-Leste
• High-grade discovery in near-surface environment
• Low-impurity mineralogy suitable for premium applications
• Significant expansion potential across multiple prospects

Consequently, the combination of exceptional grades, favourable metallurgy, and substantial exploration upside positions Ira Miri as a potentially transformational discovery for Estrella Resources.

Investment Implications and Market Context

Valuation Considerations

High-grade manganese deposits typically attract premium valuations based on several factors. The exceptional grade profile at Ira Miri, combined with low impurity levels, suggests potential for premium product pricing.

Near-surface mineralisation could enable low-cost extraction methods, improving project economics. Furthermore, the consistent geological framework identified through drilling provides a solid foundation for resource estimation.

Resource Development Pathway

The folded bed structure with predictable geometry should enable efficient resource delineation drilling. Multiple targets across the broader tenement package offer exploration upside beyond the initial discovery.

Regional Strategic Value

Timor-Leste's emerging status as a mining jurisdiction offers potential advantages for project development. The regulatory framework appears supportive of mineral development, whilst the strategic location provides access to Asian steel markets where demand continues growing.

Key Investment Takeaway

Estrella Resources has demonstrated the discovery of world-class manganese grades at Ira Miri, with results that position the company among the most promising manganese exploration stories globally.

With exceptional grades up to 58% manganese, low impurities, and significant expansion potential across multiple targets, investors should closely monitor upcoming developments. The company continues advancing this potentially major discovery through its systematic exploration programme.

The combination of exceptional grades, favourable metallurgy, and exploration upside presents a unique opportunity in an essential industrial commodity market. Therefore, Estrella Resources represents a compelling investment proposition for those seeking exposure to high-quality manganese discoveries in underexplored regions.

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