Gravity Survey Defines Core of Large VHMS Copper-Gold System at Oval Targets
Great Western Exploration’s recent gravity survey at the Oval Targets in Western Australia reveals a promising core of a large VHMS copper-gold system, prompting plans for a deep drill test supported by government funding applications.
- Close-spaced ground gravity survey defines core of large VHMS copper-gold system
- Gravity anomaly coincides with geologically modelled prospective VHMS horizon
- Oval and Oval South targets interpreted as one mineralisation system
- Diamond drill hole designed to 750m depth to test anomaly
- Company seeks WA Government co-funding under Exploration Incentive Scheme
Gravity Survey Highlights New Exploration Frontier
Great Western Exploration (ASX, GTE) has announced a significant breakthrough in its Yerrida North Project with the completion of a close-spaced ground gravity survey at the Oval Targets in Western Australia. The survey has delineated a gravitational anomaly interpreted as the potential core of a large Volcanic Hosted Massive Sulphide (VHMS) copper-gold mineralisation system. This discovery is particularly notable given its geological similarity to the nearby DeGrussa Copper-Gold Deposit, one of the region’s most prolific VHMS systems.
Interpreting the Anomaly, A Potential ‘Black Smoker’ Zone
The gravity anomaly aligns closely with a previously modelled VHMS horizon hosted by a siltstone unit exhibiting a strong VHMS geochemical signature. Great Western Exploration interprets this zone as representing higher density rocks, likely massive sulphides, situated near the central vent or “black smoker” position of the mineralising system. The company now views the Oval and Oval South Targets as components of a single, extensive VHMS system, expanding the potential scale of mineralisation.
Strategic Structural Setting Enhances Prospectivity
Geologically, the anomaly is positioned along the intersection of the Ida Fault and the Yerrida Basin Growth Fault, structures known to act as conduits for mineralising fluids. This structural setting is considered highly favourable for the development of VHMS deposits, which typically form from hydrothermal vents on the seafloor. The presence of these faults adds a compelling dimension to the exploration narrative, suggesting a focused pathway for copper-gold mineralisation.
Next Steps, Drilling and Government Support
To test the gravity anomaly and its associated VHMS horizon, Great Western Exploration has designed a diamond drill hole targeting a depth of 750 metres. The company plans to apply for co-funding from the Western Australian Government’s Exploration Incentive Scheme (EIS), with successful applicants to be announced in October 2025. This funding could accelerate the drilling program, which is pivotal for confirming the presence and extent of mineralisation.
Financial Position and Outlook
Great Western Exploration is well-positioned financially, reporting a strong cash balance of $2.7 million as of June 2025. This solid funding base supports the company’s upcoming exploration activities and underscores its commitment to advancing the Yerrida North Project. Investors will be watching closely for the government funding decision and subsequent drilling results, which could materially impact the company’s valuation and strategic outlook.
Bottom Line?
The upcoming drill test at Oval Targets could unlock a major VHMS copper-gold discovery, with government funding decisions set to shape the pace of exploration.
Questions in the middle?
- Will the planned 750m diamond drill hole confirm the interpreted massive sulphide mineralisation?
- How might the intersection of the Ida and Growth Faults influence the size and grade of the VHMS system?
- What impact will the Western Australian Government’s Exploration Incentive Scheme funding decision have on Great Western’s exploration timeline?
