The Bali Project is located approximately 250 kilometres west of Newman in Western Australia. It compromises a single granted exploration license within the Shire of Ashburton that covers an area of approximately 41 square kilometres.
There are a number of prospects within the Bali Project area with exploration largely focused on the northwest trending Bali shear zone. The Bali shear extends 8 kilometres through the centre of the tenement and hosts gold, base metal and uranium mineralisation.
Currently, five zones of mineralisation have been identified along the shear within the Bali project area. These zones of mineralisation have only been lightly drill tested to date with the majority of holes testing only the top 30 metres. Positive results from the historic drilling include:
- 9 metres @ 2.14% Copper & 9.8 g/t silver (Drill hole CL4)
- 3 metres @ 3.75% Copper & 18.3 g/t silver from 5 metres downhole (Drill hole CL1A)
- 6 metres @ 7.17% Copper & 27.3 g/t silver from 17 metres downhole (Drill hole CL1A).
An airborne electromagnetic (AEM) and magnetic survey was conducted across the entire Bali Project tenement area. The AEM and magnetic data was collected using the latest Xcite airborne system, developed by New Resolution Geophysics Australia’s (NRG).
The survey data was processed and assessed by Perth based Southern Geoscience Consultants.
The high-resolution airborne electromagnetic (AEM) and magnetic survey totalled 441 line-kilometres which covered the entire Bali Project. The survey was designed to highlight conductors representing potential primary copper mineralisation that may be present within the project area.
The survey data was planned, processed and assessed by Southern Geoscience Consultants. Feedback from SGC includes the following observations and comments:
- There are no strong, discrete EM anomalies that present as walk-up drill targets.
- Strike-extensive structures that host the known Cu mineralisation are evident in both the EM (as an IP effect) and magnetic datasets.
- The Bali mineralisation doesn’t have a conductive AEM response.
- Drill targeting will need to be driven by the known geology and drilling at this stage, with the geophysics to map out the host structures but not the mineralisation directly.
- Develop a structural and lithological interpretation of the magnetic and EM data to build a project-wide framework and develop a set of targets based on integrating the interpretation results with all available geological data.
- Characterise the physical properties of the known mineralisation to more accurately assess what geophysical methods may directly detect mineralisation – use fresh drill core or hand samples if suitable.
- Ground geophysical surveys need to be carefully considered given the difficult access and terrain.
- Test DHEM could be carried out if drilling proceeds, to assess if it can detect mineralisation in closer proximity.
Map showing Bali shear zone between the Ashburton Formation and Capricorn Group. Source Thorne et al., (2004)
Airborne EM and magnetics across full Bali tenement (100m line spacing)