Chilwa Minerals Resource Upgrade Transforms Mposa Critical Minerals Project

Chilwa Minerals Limited has achieved a significant milestone with the Chilwa Minerals resource upgrade at Mposa, delivering substantial improvements in both resource classification and overall tonnage for its flagship deposit in Southern Malawi. The updated JORC 2012 compliant mineral resource estimate represents a major advancement for the Critical Minerals project, positioning the company as a potential key player in the rapidly expanding mineral sands sector.

Major Resource Classification Breakthrough Achieved

The standout achievement from this latest update is the reclassification of 83% of the Mposa deposit resources to Measured category – the highest confidence level under JORC guidelines. Furthermore, this represents a dramatic improvement from the previous estimate where all resources were classified as Indicated.

Updated Mposa Resource Summary:

The total Measured and Indicated resources increased by 3.35Mt to 25.65Mt, with contained Heavy Mineral Concentrate (HMC) rising from 0.9Mt to 1.07Mt – an increase of approximately 19%.

High-Grade Core Zone Identified for Strategic Development

Perhaps equally significant is the identification of distinct northeastern and southwestern zones within the main Mposa deposit. In addition, the NE zone has emerged as a standout high-grade core:

Mposa Main NE Sub-deposit Highlights:

• 11.26Mt at 5.61% THM (Total Heavy Minerals)
• Contains 52% of total Measured Resources
• 17.08% slimes content (well below licence average)
• Enhanced mineral grades across key products

However, this high-grade core provides Chilwa with significant optionality for staging and early-phase development, potentially allowing for selective mining of the highest-value areas first.

Rare Earth Component Confirmed Through Advanced Mineralogy

For the first time, the MRE includes estimates for Monazite – a rare earth element (REE) bearing mineral. Consequently, this expansion includes Leucoxene and Garnet within the mineral assemblage, adding significant strategic value to the project.

Confirmed Product Portfolio:

The confirmation of Monazite is particularly significant given the current global focus on critical minerals security. Furthermore, rare earth supply chains have become increasingly important. Head characterisation and flowsheet studies from a 4.2-tonne sample have validated the commercial viability of producing Monazite concentrates.

What is Heavy Mineral Concentrate (HMC)?

Heavy Mineral Concentrate refers to the valuable dense minerals recovered from mineral sands through gravity separation techniques. These minerals – primarily ilmenite (titanium), zircon, rutile, and in this case monazite – are significantly denser than the surrounding quartz sand, allowing for efficient separation.

Why HMC Matters to Investors:

• Direct revenue generator: HMC tonnage directly correlates to potential revenue
• Processing efficiency indicator: Higher HMC grades mean more efficient operations
• Market flexibility: Multiple products provide revenue diversification
• Critical minerals exposure: Titanium and zircon are essential for modern manufacturing

Comprehensive Project Resource Portfolio

While the Chilwa Minerals resource upgrade at Mposa represents the headline achievement, Chilwa's total project resources across all ten identified HMS deposits now stand at impressive levels:

Total Project Resources (1.0% THM cut-off):

This positions Chilwa among the larger undeveloped mineral sands projects globally. In addition, contained HMC of 4.54 million tonnes provides substantial scale for potential development.

Advanced Technical Foundation Supports Development Pathway

The resource update is underpinned by comprehensive technical work that positions the project for potential development. Moreover, this technical foundation demonstrates the project's commercial viability:

Technical Achievements:

• 773 sonic drill holes totalling 4,787 metres
• 50m x 50m drill spacing in central deposit areas
• QEMSCAN mineralogical analysis for precise mineral identification
• 4.2-tonne bulk sample metallurgical testing completed
• Proven flowsheet development for multiple product streams

Managing Director Commentary

"With 11.26 Mt of Measured Resources at 5.61% THM, the Mposa Main NE sub-deposit stands out as a high-grade core and provides Chilwa with increased optionality for staging, scheduling and early-phase development," said Cadell Buss, Managing Director.

Strategic Development Timeline and Catalysts

Looking ahead, Chilwa has outlined a clear pathway toward potential development. Furthermore, the company has established specific milestones:

Near-term Catalysts:

• Q1 2026: Completion of comprehensive scoping study
• Ongoing: Further MRE updates for remaining deposits
• 2025: Completion of sonic drilling at Mpyupyu Flats (100m x 200m grid)
• Q1 2026: Northern deposits exploration focus

The company's systematic approach to resource definition and metallurgical optimisation provides a structured foundation for investment evaluation. Consequently, this supports potential development decisions.

Investment Implications and Market Positioning

The Chilwa Minerals resource upgrade at Mposa significantly enhances the company's investment proposition across multiple dimensions. For instance, several key metrics have improved substantially:

Enhanced Investment Metrics:

• 83% Measured classification provides development certainty
• 25.65Mt total resource at Mposa alone offers substantial scale
• Multi-product revenue streams including critical minerals exposure
• High-grade core zone enables staged development approach
• Proven metallurgy reduces technical risk

The inclusion of Monazite (REE) and Leucoxene in the product suite aligns perfectly with global critical minerals strategies. However, this also supports supply chain security initiatives, potentially providing additional value uplift and strategic importance.

Key Investment Takeaway

The Chilwa Minerals resource upgrade at Mposa has transformed the flagship deposit from a promising exploration target into a substantial, well-defined resource. Moreover, with 83% Measured classification and confirmed rare earth potential, the project offers compelling investment prospects. With a comprehensive scoping study due Q1 2026 and multiple development options available, the company represents a compelling opportunity in the rapidly expanding critical minerals sector.

Why Investors Should Continue Monitoring Chilwa

The successful upgrade to Measured category resources demonstrates significant technical progress. In addition, the confirmation of rare earth potential and identification of a high-grade development core positions Chilwa as a serious contender in the mineral sands sector.

The company's systematic exploration approach, proven technical capabilities, and strategic location in Malawi provide multiple pathways for value creation. Furthermore, global demand for critical minerals continues accelerating.

With the scoping study completion targeted for Q1 2026 and additional resource updates pending across the broader project area, Chilwa offers investors exposure to a rapidly advancing critical minerals development story. Consequently, this provides substantial scale and multiple value drivers for potential investors.

Want to Explore Chilwa's Investment Opportunity Further?

With 83% of resources now classified at the highest confidence level and confirmed rare earth potential, Chilwa Minerals' Mposa deposit has been transformed into a compelling critical minerals investment proposition. The company's systematic approach to resource development, combined with a clear pathway to a Q1 2026 scoping study, offers investors exposure to a rapidly advancing project with substantial scale and multiple value drivers. To discover more about Chilwa's strategic positioning in the critical minerals sector and explore the full investment opportunity, visit www.chilwaminerals.com.au.