Great Western Exploration Targets Copper-Gold Core at Yerrida North Project

Great Western Exploration Set to Test Core of Major Copper-Gold System

Great Western Exploration (ASX: GTE) has secured all necessary permits to drill what could be the core of a potentially large volcanic hosted massive sulphide (VHMS) copper-gold system at its Yerrida North Project in Western Australia. The announcement confirms drilling will commence in March 2026, targeting an extensive gravity anomaly that geophysics suggests represents the centre of a mineralisation system similar to the nearby DeGrussa Copper-Gold Deposit.

The upcoming drill programme represents a significant milestone for Great Western, with the company designing a 750-metre diamond drill hole to test the coincident gravity anomaly and modelled prospective horizon. The target sits adjacent to Sandfire Resources' DeGrussa and Monty deposits, providing compelling geological precedent for the potential discovery of a major copper-gold system.

Breakthrough Geophysics Points to Potential Discovery

Great Western's systematic exploration approach has culminated in identifying what the company believes represents the core of a VHMS copper-gold mineralisation system at the Yerrida North Project by Great Western Exploration Ltd. The breakthrough came through ground gravity surveying and 3D inversion modelling, which revealed a significant gravitational anomaly coincident with the most prospective geological horizon identified from previous drilling.

Key Technical Highlights:

• Gravity Anomaly: Extensive gravitational high interpreted to represent higher-density rocks, potentially indicating massive sulphides at the central 'black smoker' zone

• Strategic Location: Anomaly positioned at intersection of the crustal-scale Ida Fault and the GSWA Growth Fault, creating an ideal fluid conduit for mineralisation

• Geological Validation: Target horizon hosted within siltstone units showing strong VHMS pathfinder signatures from previous drilling

• System Scale: Both Oval and Oval South targets now interpreted as belonging to one large mineralisation system

The company's interpretation suggests previous drilling may have only tested the fringes of multiple VHMS system horizons. Furthermore, the upcoming programme is designed to target the potentially mineralised core for the first time.

Understanding VHMS Systems: The Key to Copper-Gold Wealth

Volcanic Hosted Massive Sulphide (VHMS) deposits represent some of the world's most significant copper-gold resources, formed through ancient underwater volcanic processes. These systems develop when hot, mineral-rich fluids from volcanic vents ('black smokers') deposit metals on the seafloor, creating concentrated zones of copper, gold, and other valuable minerals.

Why VHMS Systems Matter to Investors

VHMS deposits are particularly attractive because they typically contain high-grade mineralisation in relatively compact zones. This makes them potentially economic even at smaller scales. The nearby DeGrussa deposit, operated by Sandfire Resources, demonstrates the significant value potential of these systems in the region.

The geological setting at Great Western's Oval targets mirrors the conditions that created DeGrussa. Similar rock types, ages, and structural controls provide strong theoretical support for the potential to discover a comparable deposit system.

Formation Process

VHMS deposits form when underwater volcanic activity creates hydrothermal vents that spew mineral-rich fluids onto the ancient seafloor. These fluids, heated by magma chambers below, dissolve metals from surrounding rocks and concentrate them in specific zones.

When the hot fluids meet cold seawater, the metals precipitate out, forming layers of massive sulphide minerals containing copper, gold, zinc, and silver. The 'black smoker' zones represent the most concentrated areas of metal deposition, where temperatures and fluid flow rates are highest.

Strategic Positioning in Proven Copper-Gold Territory

Great Western's Yerrida North Project by Great Western Exploration Ltd benefits from its proximity to established copper-gold production and the geological similarities to the successful Bryah Basin. The company holds a strategic tenement package over the underexplored Yerrida Basin, which geological research indicates shares comparable formation conditions with the neighbouring Bryah Basin that hosts DeGrussa.

The intersection of the Ida Fault and Growth Fault at the target location represents what the company considers an optimal structural setting for VHMS mineralisation development. These large-scale fault systems can act as conduits for mineralising fluids, potentially focusing copper-gold enrichment in concentrated zones.

In addition, the announcement indicates that multiple geological attributes support the potential for a significant DeGrussa-style VHMS copper-gold mineralisation system. The drilled geological units and associated textures show alteration patterns that, supported by geochemical analysis, indicate a VHMS mineralisation environment.

Managing Director Shane Pike commented: "All permits have now been received to allow drill testing of a coincident gravity anomaly and modelled prospective VHMS horizon, interpreted to be the core of a potentially large VHMS copper-gold mineralisation system at the Oval Copper-Gold Target."

Expanding Pipeline: Six Additional Targets Await

Beyond the immediate Oval drilling programme, Great Western has identified six Juggernaut Copper-Gold Targets scheduled for drilling following the March 2026 programme at the Yerrida North Project. The announcement indicates access approvals for these additional targets are anticipated during the March 2026 quarter, providing the company with an extensive pipeline of exploration opportunities.

Upcoming Exploration Timeline:

1. March 2026: Commencement of 750m diamond drilling at Oval South
2. Q1 2026: Expected access approvals for Juggernaut targets
3. Mid-2026: Planned drilling of six Juggernaut targets

This systematic approach demonstrates Great Western's methodical strategy for unlocking the potential of its comprehensive tenement package across the Yerrida Basin. Moreover, the company reports that trace element data of the mafic volcanic rocks indicates a subduction-related formation setting prospective for VHMS mineralisation.

Technical Validation Points:

• VHMS Pathfinder Evidence: Co-enrichment of copper, gold, bismuth, sulphur, zinc, arsenic, lead, silver, tellurium, antimony, and indium on discrete sedimentary horizons indicates multiple possible fallout zones from adjacent VHMS "black smokers"

• Stratigraphic Correlation: Volcanic and sedimentary rocks intersected are interpreted to be part of the Killara Formation, with previous work indicating this package is the stratigraphic equivalent of the DeGrussa Formation

• Structural Advantage: Position on the crustal scale fertile Ida Fault, intersected by a basin defining "growth fault", is regarded as a favourable position to produce a VHMS mineralisation system

Investment Thesis: Positioned for Potential Major Discovery

Great Western Exploration presents a compelling investment opportunity based on several converging factors that support potential for a significant copper-gold discovery at the Yerrida North Project by Great Western Exploration Ltd:

Discovery Potential Factors:

• Proven Geological Model: Operating in a basin with demonstrated VHMS copper-gold potential
• Strategic Location: Adjacent to producing mines with similar geological characteristics
• Technical Validation: Multiple geological and geophysical indicators supporting mineralisation potential
• Systematic Approach: Progressive exploration programme building towards high-priority drill targets
• Resource Leverage: 750m drill hole designed to test extensive geological and geophysical anomalism

The company's interpretation that previous drilling tested only the fringes of the system, combined with the new geophysical targeting of the interpreted core, suggests the upcoming drilling represents the most significant test of the project's potential to date.

Technical Confidence Indicators

The announcement details that inversion 3D modelling of ground gravity data found the gravity anomaly was coincident with the modelled prospective VHMS horizon at the Oval South Target. The company interprets this anomaly to reflect higher-density rocks, potentially representing massive sulphides situated at the central 'black smoker' zone of a large VHMS copper-gold mineralising system.

Risk-Reward Profile

While exploration inherently carries discovery risk, Great Western's systematic approach and the geological precedent provided by nearby successful operations offer compelling upside potential. However, investors willing to participate in early-stage copper-gold exploration should consider this risk-reward profile carefully.

Why Investors Should Follow Great Western Exploration

Great Western Exploration has positioned itself at the forefront of copper-gold exploration in one of Western Australia's most prospective yet underexplored regions. The company's methodical progression from regional targeting to drill-ready prospects demonstrates technical competence and strategic focus.

Key Tracking Points for Investors:

• March 2026 drilling results from the interpreted core of the VHMS system
• Progress on Juggernaut target approvals expanding the exploration pipeline
• Geological interpretation updates as drilling provides new data on system scale and grade potential
• Resource estimation potential if drilling confirms significant mineralisation

The announcement confirms Great Western's preferred drill contractor has been engaged and is scheduled to commence drilling in March 2026. This timeline provides investors with clear milestones for monitoring progress and potential value creation catalysts.

Market Context

The copper-gold sector continues to attract strong investor interest due to the critical role these metals play in renewable energy infrastructure. In addition, the ongoing global energy transition has increased demand for these strategic metals.

VHMS deposits, with their typically high-grade characteristics, represent particularly attractive targets for development in the current commodity price environment. These deposits often contain concentrated mineralisation that can be economically viable even at smaller scales.

Key Takeaway: Great Western Exploration stands at a pivotal moment with drilling scheduled to test what could be the core of a major copper-gold system. With geological conditions mirroring the nearby successful DeGrussa deposit and systematic exploration pointing to significant discovery potential, the March 2026 drilling programme could be transformational for the company and its shareholders.

The combination of proven geological concepts, strategic location, and systematic exploration approach positions Great Western as a compelling opportunity in the copper-gold exploration space. Furthermore, this presents particular value for investors seeking exposure to potential major discoveries in established mining regions.

Ready to Capitalise on the Next Major Copper-Gold Discovery?

Discovery Alert's proprietary Discovery IQ model delivers real-time alerts on significant copper-gold discoveries like Great Western's upcoming drilling results, instantly empowering subscribers to identify actionable opportunities ahead of the broader market. Understand why major mineral discoveries can lead to substantial market returns by exploring Discovery Alert's dedicated discoveries page, then begin your 30-day free trial today to position yourself ahead of the market.