Neometals Ltd Copper Discovery Confirms Primary Sulphides at Rinaldi

Neometals Strikes Copper at Depth: Primary Sulphides Confirmed at Historic Rinaldi Prospect

Neometals Ltd (ASX: NMT) has delivered a significant exploration breakthrough at its Barrambie Gold Project in Western Australia, confirming the presence of primary copper sulphides at the historic Rinaldi prospect. This Neometals Ltd copper discovery represents a major milestone, with the company's first-pass reverse circulation (RC) drilling programme identifying bornite and chalcopyrite mineralisation at approximately 70 metres vertical depth.

The drilling results extend well beyond the shallow historic workings that ceased at just 30 metres depth. Furthermore, this marks a step-change in understanding the prospect's potential, with initial copper assays from selected samples revealing encouraging grades and widths.

Most notably, hole 26RCRC002 returned 7 metres at 1.72% copper from 82 metres depth, including a high-grade interval of 1 metre at 5.06% copper. Additionally, a second hole, 26RCRC004, delivered 5 metres at 1.26% copper from 75 metres, including 1 metre at 2.43% copper.

These results represent only the first wave of assays from the programme, covering approximately 10% of the 526 drill samples collected across five holes totalling 495 metres. The company has strategically prioritised samples showing visible mineralisation indicators for expedited analysis, providing an early indication of the copper potential whilst routine analysis of remaining samples continues.

Historic Production Provides Strong Foundation

The Rinaldi copper prospect carries a compelling production history that adds weight to the current exploration success. Historic records show high-grade copper was mined from the prospect in 1944 and between 1956-1961 through shallow open pit and underground workings.

This historic production was limited to approximately 30 metres vertical depth, meaning the Neometals Ltd copper discovery has now extended the known mineralisation envelope more than double the historic mining depth. Consequently, this breakthrough opens up entirely new exploration territory.

According to the drilling programme, the laminated quartz vein hosting copper mineralisation maintains a consistent 7-metre thickness at depth. This indicates potential thickening compared to the 1-4 metre width reported in historic workings, suggesting the mineralised system may expand with depth.

What Makes This Discovery Significant?

Geological logging has identified copper mineralisation at the redox front, with oxidised copper minerals (malachite and chrysocolla) in the upper zones transitioning to primary sulphides (bornite and chalcopyrite) in the fresh rock. The presence of these primary sulphides is particularly encouraging as they indicate the drilling has intersected the main mineralised zone rather than secondary enrichment.

Understanding Copper Sulphides: Why Primary Minerals Matter

Primary copper sulphides represent the original copper mineralisation formed during the initial geological processes that created the deposit. Unlike secondary or oxide copper minerals that form through weathering and chemical alteration near the surface, primary sulphides like bornite and chalcopyrite indicate the drilling has reached the main source of copper mineralisation.

Bornite typically contains around 63% copper by weight, making it one of the higher-grade copper minerals. In contrast, chalcopyrite contains approximately 34% copper and represents the most common primary copper mineral in many deposits worldwide.

For investors, the identification of primary sulphides in the Neometals Ltd copper discovery is significant for several reasons. Firstly, it confirms the presence of a genuine copper deposit rather than just surface enrichment. Moreover, primary sulphides often indicate larger, more continuous mineralised systems.

Key Advantages of Primary Sulphide Discovery

The fresh sulphide zone typically extends much deeper than oxide zones, whilst primary sulphides can support larger-scale mining operations if grades and continuity prove sufficient. The transition from oxide minerals near surface to primary sulphides at depth suggests Neometals has successfully penetrated into the main mineralised system.

This provides a strong foundation for follow-up exploration and demonstrates the potential for significant resource expansion beyond current understanding.

Expanded Mineralised Zone Reveals Broader Potential

Beyond the core quartz vein, geological logging has identified pyrite, chalcopyrite and bornite sulphides adjacent to the main structure. This creates a wider quartz-sulphide mineralised trend up to 15 metres in downhole width, significantly expanding the potential mineralised envelope beyond the historic narrow vein concept.

The expanded mineralised zone suggests the Rinaldi prospect may host a more substantial copper system than previously understood. The presence of sulphide mineralisation adjacent to the main quartz vein indicates potential for bulk tonnage mineralisation rather than just narrow high-grade structures.

This observation could fundamentally change the economic potential of the prospect, as bulk tonnage operations typically offer greater scalability and longer mine life compared to narrow vein mining.

Strategic Next Steps: Geophysics to Define Scale

Neometals has moved quickly to capitalise on the drilling success, scheduling a Dipole-Dipole Induced Polarisation (DDIP) survey to commence in April 2026. This geophysical technique is specifically designed to identify chargeability anomalies associated with sulphide mineralisation, making it ideal for mapping the extent of copper sulphides at Rinaldi.

The DDIP survey will cover approximately 2km by 1km centred on the historic prospect, providing a comprehensive view of potential sulphide distribution across the broader target area. This systematic approach will enable the company to achieve several critical objectives.

How Will Geophysics Advance the Project?

The survey will model the geometry of the primary sulphide mineralisation whilst assessing the scale of the mineralised system. Furthermore, it will help prioritise targets for follow-up drilling and identify extensions beyond the current drill-tested area.

"This initial drilling programme has successfully confirmed the presence of primary copper sulphide mineralisation beneath the historic Rinaldi workings, which we consider a key step-change in understanding the prospect's potential," said Chris Reed, Managing Director.

Regional Context Strengthens Investment Case

The Neometals Ltd copper discovery gains additional significance from its location within the Barrambie Gold Project, which sits in a region experiencing renewed exploration interest. The prospect lies in proximity to Solstice Minerals' Nanadie Deposit, highlighting the area's mineral prospectivity.

Neometals' exploration team has identified three additional target zones for copper exploration through desktop review of favourable geological units and structural controls. This systematic targeting approach suggests the Rinaldi discovery may represent just the beginning of copper exploration across the broader project area.

The company's 100% ownership of the Barrambie Project provides complete control over exploration timing and strategy. Additionally, the project's location in Western Australia offers access to established mining infrastructure and services, reducing potential development costs and timelines.

Why Location Matters for Copper Projects

Western Australia's established mining infrastructure provides significant advantages for potential copper development. The region offers access to skilled labour, equipment suppliers, and processing facilities, whilst maintaining stable regulatory frameworks and established permitting processes.

Investment Thesis: Multiple Value Drivers Align

The Neometals Ltd copper discovery at Rinaldi represents a compelling addition to the company's diverse portfolio of mineral assets and processing technologies. The drilling success validates the company's exploration strategy and demonstrates the potential for resource expansion beyond current understanding.

Key investment considerations include:

• Proven mineralisation: Historic production provides confidence in deposit viability
• Depth extension: Primary sulphides confirmed well beyond historic mining limits
• Scale potential: Geophysics will test for larger mineralised system
• Exploration upside: Three additional copper targets identified
• Strategic location: Established mining region with infrastructure access
• Technical expertise: Systematic exploration approach with clear next steps

The transition from oxide to primary sulphide mineralisation suggests potential for a substantial copper resource if the geophysical survey confirms broader sulphide distribution. With copper prices supported by global decarbonisation trends and infrastructure development, successful resource definition could significantly enhance Neometals' project portfolio.

Market Timing Advantages

Current copper market dynamics favour new discoveries, with global demand driven by renewable energy infrastructure and electric vehicle adoption. Consequently, projects like Rinaldi that demonstrate primary sulphide mineralisation at accessible depths attract significant investor and industry attention.

Why Should Investors Follow Neometals?

The Rinaldi copper discovery demonstrates Neometals' ability to unlock value through systematic exploration of historic prospects using modern techniques. The company has successfully extended known mineralisation to more than double the historic mining depth, whilst identifying a broader mineralised envelope than previously recognised.

With the April 2026 geophysical survey scheduled and additional assay results pending, the next few months should provide crucial data on the scale and geometry of copper mineralisation at Rinaldi. The systematic approach of drilling to geophysics to follow-up drilling positions Neometals to efficiently advance the prospect toward resource definition.

The company's diverse portfolio spanning gold exploration, titanium-vanadium assets, and lithium processing technology provides multiple avenues for value creation. The copper discovery adds another dimension to the investment case, demonstrating management's ability to identify and advance quality mineral opportunities.

"Key Takeaway: Neometals has successfully confirmed primary copper sulphides at depth below historic Rinaldi workings, extending known mineralisation and identifying broader sulphide zones. With geophysical surveys planned and additional assays pending, the company is systematically advancing a prospect that could deliver significant resource growth in a strategic copper district."

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