Catalina Resources Reinterprets Pithara Gold Mine to Define RC Drill Targets

Catalina Resources Defines New Pithara Gold Drill Targets Through Geological Reinterpretation

Catalina Resources Limited (ASX: CTN) has reported the first known full geological reinterpretation of the historical Pithara Gold Mine since mining ended in 2011, with the work identifying multiple drill-ready targets beside the existing pit. The revised exploration model suggests the mineralised shear zone extends beyond the historical workings at a mine that previously produced about 9,000 ounces of gold at an average recovered grade of 15.4 g/t Au.

The update matters because Catalina has already moved from interpretation to execution. The company confirmed that a 26-hole, 3,120-metre Reverse Circulation (RC) drilling program has been designed around the new model, with land access secured, a Program of Work approved, and heritage due diligence nearing completion.

A High-Grade Historical Gold System With Limited Follow-Up

The Pithara Project sits within Western Australia's Dalwallinu Greenstone Belt and includes the historical Pithara open pit. Earlier drilling and subsequent mining confirmed an unusually high-grade gold system; however, broader structural controls were not fully understood when operations ceased.

Historical results cited in the announcement include several standout intercepts:

For investors, these historical numbers provide an important benchmark. Gold grades above 5 g/t Au are typically regarded as robust in many gold systems, so a historical recovered grade of 15.4 g/t Au places Pithara in a distinctly higher-grade category.

At the same time, the announcement makes clear that the previously mined quartz orebody within the current pit is interpreted to have been fully extracted. That means the investment focus is not on re-mining the old pit, but on whether the surrounding structures host extensions of the same mineralised system.

"Pithara has already demonstrated its ability to produce exceptionally high-grade gold, but our work shows there is still considerable untapped exploration potential beyond the historical pit," said Ross Cotton, Executive Director.

"Importantly, this program is not simply drilling around a historical mine. It is the first drill program designed around Catalina's revised geological model, which has identified compelling extensions to the historical high-grade gold system beyond the limits of previous mining."

What the Reinterpretation Identified at Pithara

In the report, Catalina said its geological review combined several datasets to rebuild the structural picture at Pithara. These included:

• Detailed pit wall mapping
• Historical drilling data
• Surface geochemistry
• High-resolution magnetic data reinterpretation completed by Southern Geoscience in November 2025

This integrated review appears to have improved targeting by connecting observed geology in the pit with broader geophysical patterns around it.

A North-South Shear Zone as the Main Control

According to the announcement, Catalina mapped a north-south trending shear zone within the pit and interpreted it as the principal mineralising structure. A shear zone is a deformed corridor in rock where movement has occurred over time. These zones are important in gold exploration because they can act as pathways for mineral-rich fluids.

The company reported that this structure is around 20 metres wide on the northern pit face and narrows southward to about 10 metres. It comprises:

• Mafic gneiss
• Hornfelsic gneiss with migmatitic textures
• Dolerite
• Associated felsic veins

These rock types sit within a broader granite gneiss host.

An Offset Continuation South of the Dyke

A second key finding relates to an east-west trending dolerite dyke that cuts across both the host rocks and the shear zone. Catalina's mapping indicates the shear zone is displaced eastward south of this dyke.

That detail is important because offset structures can leave a mineralised continuation in a position that earlier drilling may not have tested. In practical terms, the historical mine may have only exploited one segment of the broader system.

Does the Magnetic Anomaly Support the New Model?

The reinterpretation of magnetic data identified a distinct magnetic anomaly that coincides with the historical pit. Catalina stated this anomaly closely matches the mapped mafic rock units inside the mineralised shear zone, while surrounding magnetic lows are interpreted as granite gneiss host rock.

Furthermore, this provides a broader targeting framework. If the magnetic signature reflects the same shear-hosted geology outside the pit, it may help trace the mineralised corridor north, south, and into the interpreted offset area.

What Does Shear Zone-Hosted Gold Mean for Investors?

Shear zone-hosted gold deposits are common exploration targets in Australian greenstone belts. Understanding the concept helps explain why Catalina's reinterpretation is material.

A shear zone is a narrow rock corridor that has been compressed, stretched, or broken by tectonic forces. This deformation creates fractures and openings where hot fluids can move through the rock. If those fluids carry dissolved gold, the metal can be deposited in quartz veins or altered rock within the shear zone.

Key concepts relevant to the Pithara Gold Mine include:

Why does an offset extension matter? If a later rock intrusion or structural event shifted the gold-bearing zone sideways, older drilling may have missed the continuation simply because it was not tested in the correct position.

Catalina's work suggests that this may be the case at Pithara, particularly to the south-east of the historical pit. For investors, this type of target can be attractive because the system is already known to host high grades.

The Planned Drilling Program and How It Has Been Designed

Catalina's next step is a 26-hole RC drilling program for about 3,120 metres. The company stated the layout has been built specifically to test the revised geological interpretation.

Key program parameters are summarised below:

The chosen drill direction is a technical point worth noting. Catalina stated the holes are designed to intersect the steeply west-dipping quartz vein system at a favourable angle. That matters because drilling too parallel to a structure can understate its true thickness or miss it altogether.

The program is expected to test three principal target areas:

• Northern extension of the magnetic anomaly beyond the pit
• Southern extension of the magnetic anomaly
• South-eastern offset target, where magnetic and surface geochemical data indicate a displaced continuation of the shear zone

With 50m by 50m spacing and average depths of 120 metres, the plan is intended to provide broad coverage across the interpreted extensions. In addition, this is a relatively systematic program rather than a small first-pass test.

How Advanced Are the Drilling Approvals?

The report also outlined that pre-drilling requirements are well advanced. According to Catalina:

This matters because it reduces the gap between concept and catalyst. The principal remaining step before mobilisation appears to be completion of the heritage process, a standard requirement in Western Australian exploration. For market participants, that positions drilling as a near-term event rather than a distant plan.

Why the Pithara Update May Matter to Investors

Catalina's Pithara update combines three elements that often attract attention in the junior gold exploration space.

First, there is a verified high-grade historical mine record. Production of about 9,000 ounces at 15.4 g/t Au recovered grade, alongside historical drill hits such as 7m @ 21.8 g/t Au, indicates that the system has already demonstrated strong grade.

Second, the current targets are based on a new structural interpretation rather than a repeat of earlier drilling patterns. According to the company, interpreted strike and offset extensions of the mineralised system have now been identified for the first time.

Third, the company appears close to drilling. In many exploration stories, reinterpretation can take months to translate into field activity. However, at Pithara, the approvals pathway is already well advanced.

There are still important uncertainties. The revised model remains an interpretation until tested by drilling, and historical high grades inside the pit do not guarantee extensions outside it. Even so, the upcoming program is designed to answer a clear geological question.

"Catalina's upcoming drilling is expected to test whether a historically high-grade gold system at Pithara extends north, south, or into a displaced south-eastern position beyond the old pit. If drilling confirms continuity, it could materially expand the known footprint of mineralisation around the historical mine."

What to Watch Next From Catalina Resources

The next milestone is the start of drilling following completion of heritage due diligence. After that, investors are likely to focus on whether the first holes confirm:

• Continuity of the north-south shear zone
• Mineralisation along the northern and southern strike extensions
• Evidence for the eastward-displaced south-eastern continuation
• Alignment between the magnetic anomaly and gold-bearing geology

Catalina has moved the Pithara Gold Mine from historical review into active target testing. The coming RC program is expected to determine whether the revised model can extend a small but very high-grade historical gold mine into a broader exploration opportunity.

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