Gateway Mining Extends Cowza Gold Strike to 3.5km at Yandal Project

Gateway Mining's Cowza Discovery Extends to 3.5km of Continuous High-Grade Gold Mineralisation

Gateway Mining Limited (ASX: GML) has reported that high-grade gold mineralisation at the Cowza prospect within its Yandal Gold Project in Western Australia has now been traced over an estimated 3.5 kilometres of continuous strike length, according to its ASX announcement dated 27 July 2026. The latest aircore drilling results add a further 1 kilometre to the 2.5-kilometre strike length outlined in the company's previous update on 21 July 2026.

The update matters because Cowza is showing both scale and consistency at an early exploration stage. Gateway has stated that mineralisation remains open in all directions, while a further 1 kilometre of drilling to the north has already intersected the same favourable geological setting, with assays still pending.

Cowza Expands Rapidly from 800 Metres to 3.5 Kilometres

According to the announcement, Cowza has grown quickly from an initial 800-metre mineralised trend to a defined footprint of 3.5 kilometres in a matter of weeks. That pace of growth reflects step-out aircore drilling designed to test continuity along strike rather than isolated infill success.

Gateway said every drill traverse completed to date has intersected gold mineralisation linked to a broad zone of shearing, quartz veining and alteration developed along a key mafic-intermediate contact. In practical terms, that means the company is not just finding isolated high-grade intervals, but repeatedly intersecting the same mineralised geological corridor.

For investors, continuity is often as important as headline grade. A discovery that continues to return mineralisation across multiple drill lines can suggest a larger and more coherent system, although further drilling is still required to define width, geometry and depth potential.

What Does the CEO Say?

"The rapid growth of the Cowza system continues to exceed expectations, with gold mineralisation now defined over an impressive ~3.5 kilometre strike length and remaining open in multiple directions," said Richard Pugh, Chief Executive Officer of Gateway Mining.

"The growing body of evidence suggests Cowza has the potential to become a significant gold discovery within the Yandal Project."

Key Assay Results Support Continuity Across the Trend

The latest batch of reported aircore assays includes several higher-grade intervals within broader mineralised zones. The strongest result came from CSAC0019, which returned 29 metres at 1.8 g/t Au from 72 metres, including 4 metres at 11.1 g/t Au to bottom of hole.

Other key reported intercepts include:

These results indicate a mix of high-grade shoots and broader lower-grade envelopes within the same system. That combination can matter in gold exploration because wider zones may support tonnage potential, while higher-grade sections can improve the overall quality of a discovery if continuity is maintained through follow-up drilling.

Furthermore, the company noted that significant intercepts were identified using aircore sampling, which is usually an early-stage exploration method. This means the current results are useful for mapping the trend, but deeper drilling into fresh rock will be important for confirming the true scale and grade profile.

Why the Geology at Cowza Is Attracting Attention

Gateway's announcement places particular emphasis on the mafic-intermediate lithological contact at Cowza. This is the boundary between two different volcanic rock types, and in parts of the Eastern Goldfields it can provide a favourable location for gold-bearing fluids to move and deposit mineralisation.

The company reported that mineralisation is consistently associated with:

• A persistent mafic-intermediate contact
• Intense demagnetisation
• Extensive shearing
• Silica-carbonate alteration
• Quartz veining

Taken together, these features point to a large hydrothermal system. Hydrothermal fluids are hot, mineral-rich fluids that move through cracks and weaknesses in the rock. When those fluids slow down or react with surrounding rocks, gold can be deposited.

What Is a Mafic-Intermediate Contact and Why Does It Matter?

A mafic-intermediate contact is the boundary between darker, iron- and magnesium-rich volcanic rocks and lighter volcanic rocks with a slightly different chemical composition. These contacts can become important in gold exploration because they often mark a contrast in rock strength, chemistry and structure.

Gold mineralisation in many Australian gold camps is linked to fluid movement through faults and shear zones. If those fluids encounter a rock boundary that creates open space, chemical change or structural complexity, gold may be deposited there.

At Cowza, Gateway said the contact sits within a broad zone of demagnetisation. This term describes a reduction in magnetic response in the rock, often caused by alteration linked to fluid movement. In accessible terms, it can be a sign that mineralising fluids have moved through the system on a large scale.

For investors without a geology background, the key point is straightforward: a long, continuous geological contact with repeated gold intersections can suggest a system with room to grow, although this still needs to be tested by more drilling.

Glossary of Key Exploration Terms

The Broader Structural Corridor Suggests Further Upside

While the current defined mineralised strike is 3.5 kilometres, Gateway said this sits within a broader ~4.5-kilometre structural corridor along the Celia Shear. Management described this corridor as showing "all the hallmarks of a major gold system".

According to the company, drilling completed beyond the currently assayed area has continued to intersect the same sheared contact and associated alteration. Around 1 kilometre of additional drilling to the north has encountered similar shearing, veining and alteration on every drill section, with assays pending.

This matters because pending assays could extend the reported strike length again if the gold results match the geological observations. However, geology alone does not confirm grade, so investors will be watching closely for the next set of assay data. The company also stated that mineralisation remains open in all directions, meaning the current drilling has not yet identified the limits of the system along strike or at depth.

Next Steps Centre on RC Drilling and Fresh Rock Testing

The announcement outlines an active near-term exploration programme at Cowza. A second RC rig is due to commence drilling during the week of the announcement, with a sole focus on testing the scale of the mineralised footprint in fresh rock.

That is an important step in the exploration process. Aircore drilling is effective for identifying trends, but RC drilling typically provides more reliable samples from below the weathered zone. In addition, it can help clarify the true geometry and grade continuity of the mineralisation. Gateway also noted that RC drilling is currently underway at Haflinger, another prospect within the Yandal project area.

Key upcoming activities include:

For investors, these are the near-term catalysts most likely to influence sentiment around the project. Fresh rock RC results, in particular, are likely to be watched for evidence that the grades and widths seen in aircore work continue at depth.

Financial Position Supports the 2026 Exploration Programme

Gateway said it remained well capitalised at the end of the March 2026 quarter, with:

• $15.7 million in cash
• $5.6 million in liquid ASX securities
• A total liquid position of approximately $21.3 million

This is relevant because discovery drilling can become capital intensive as programmes expand from first-pass aircore work into larger RC campaigns. A stronger balance sheet can reduce near-term funding pressure while allowing a company to maintain drilling momentum. According to the announcement, that funding position supports Gateway's planned 2026 exploration activities across Yandal, including the accelerated work now under way at Cowza.

Why Cowza Is Drawing Investor Attention

Based on the ASX update, several factors are contributing to market interest in the Cowza prospect within the Yandal Gold Project:

1. Rapid strike growth, from 800 metres to 3.5 kilometres in a short period.
2. Consistent drilling success, with mineralisation reported on every traverse completed to date.
3. Higher-grade intervals, including 4m @ 11.1 g/t Au, within broader mineralised zones.
4. A coherent geological setting, centred on a persistent contact within a large altered structural corridor.
5. Pending assays from the north, where similar geological conditions have already been intersected.
6. A funded exploration programme, supported by more than $21 million in liquid assets at the March quarter end.

However, there are also factors that still require confirmation. The current results are from early-stage aircore drilling, true widths are not yet known, and the shape and continuity of mineralisation in fresh rock remain to be defined by RC drilling. Those next steps will be central to determining whether Cowza develops into a larger resource opportunity.

What Investors Should Watch Next

According to Gateway's latest announcement, the immediate focus is on converting early aircore success into a clearer picture of scale and grade in fresh rock. The pending northern assays and the start of a second RC rig are likely to provide the next major data points.

Cowza has already progressed from a newly identified target to a 3.5-kilometre continuous mineralised corridor within the Yandal Gold Project. The next phase of drilling should indicate whether that corridor continues to expand and whether higher-grade zones persist at depth.

For ASX gold investors tracking Western Australian exploration stories, Cowza is now moving into the stage where geological continuity, fresh rock grades and drilling pace become the key measures to watch.

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