Kanmantoo’s Deep Alteration Zones Signal Potential Resource Risks and Opportunities
Hillgrove Resources’ latest Magnetotelluric survey at Kanmantoo reveals deep alteration zones extending over 2km and a southern extension beyond known mineralisation, setting the stage for targeted drilling at Emily Star in September 2025.
- MT survey identifies alteration zones extending beyond 2km depth
- Conductive zone extends south past Emily Star deposit
- Upcoming drilling targets Emily Star depth extensions in Q3 2025
- Survey data integrated with previous models to refine resource targeting
- Potential to expand mining inventory and increase plant utilisation
Survey Highlights New Depth and Lateral Targets
Hillgrove Resources Limited (ASX – HGO) has completed a Magnetotelluric (MT) geophysical survey over the southern and eastern margins of its Kanmantoo copper-gold deposit in South Australia. The survey, conducted in collaboration with Fleet Space Technologies, has identified a significant conductive alteration zone extending to depths exceeding 2 kilometres below surface. Notably, this conductive corridor also extends southward beyond the previously defined mineralisation boundary near the Emily Star deposit.
Implications for Resource Expansion and Drilling Strategy
The MT survey results provide a refined geological framework that aligns well with known mineralisation structures, particularly the shear corridor hosting copper-gold mineralisation. This enhanced understanding directly informs Hillgrove’s upcoming resource expansion drilling program, with initial focus on the Emily Star deposit scheduled for September 2025. Currently, Emily Star holds a resource estimate of 2.6 million tonnes at 0.77% copper and 0.08 grams per tonne gold. The planned drilling aims to test depth extensions and improve the geological model, potentially increasing the resource base.
Strategic Importance of Emily Star and Kanmantoo Processing
Emily Star represents a strategic opportunity for Hillgrove to develop an independent mining area that supplements existing operations at Kavanagh, Spitfire, and the soon-to-be-developed Nugent deposit. Expanding mining inventory at Emily Star could enhance utilisation of Kanmantoo’s 3.6 million tonnes per annum processing plant, supporting organic growth in production capacity. The integration of the 2025 MT survey data with previous surveys from 2018, 2019, and 2023 has allowed Hillgrove to build a comprehensive deposit-scale model, improving confidence in drill targeting and resource delineation.
Looking Ahead – Further Surveys and Resource Updates
Following the Emily Star drilling campaign, Hillgrove plans a further geophysical survey in the southeastern tenement area during the September quarter of 2025. Additionally, a Mineral Resource update is anticipated in the fourth quarter of 2025, incorporating approximately 48,000 metres of diamond drilling completed to date. These developments underscore Hillgrove’s commitment to methodical exploration and resource growth at Kanmantoo, leveraging advanced geophysical techniques to unlock deeper and lateral mineralisation potential.
Bottom Line?
Hillgrove’s deepening insight into Kanmantoo’s mineral system sets a promising stage for resource growth and production expansion in 2025.
Questions in the middle?
- Will the September drilling at Emily Star confirm significant resource extensions?
- How will the expanded resource impact Kanmantoo’s production profile and mine life?
- What new insights will the upcoming southeastern tenement survey reveal about Kanmantoo’s mineral system?
