Detailed gravity surveys and subsequent geophysical modelling have enabled Tasman to confirm that Pernatty is within an interpreted northwest to southeast corridor containing commercial IOCG deposits.
These include Olympic Dam, Wirrda and three deposits in the Carrapateena area, which is 20 kilometres northwest of Pernatty.
Recent BHP discovery in same area
BHP Group Ltd (ASX:BHP) also recently announced the potential discovery of a major new deposit at Oak Dam West, which is within this corridor and northwest of Carrapateena.
There has been no previous drilling within the Pernatty exploration tenement.
The area was initially targeted by Tasman due to available geophysical data, the possibility of reasonable basement depths and proximity to Carrapateena.
Two detailed gravity surveys
Tasman conducted two detailed gravity surveys at Pernatty, building on regional and relatively widely-spaced publicly available data.
The first consisted of 358 new gravity stations designed to infill existing data at a 1x1-kilometre spacing, and locally at a 200x200-metre coverage.
This defined some areas of interest but flagged the need for a further detailed survey.
The second consisted of 271 new stations on the eastern side of the project and was designed to bring the level of coverage up to a generally 250x250-metre grid spacing.
Modelling highlights anomalies
Modelling of all available geophysical data shows the residual gravity response obtained from the new data and highlights a number of distinctive anomalies.
Combined modelling of the gravity data with existing magnetics has defined a number of potential IOCG target areas at relatively shallow depths.
Within each of these target areas, a number of specific bodies of interest have been identified.
As a result, Tasman is considering potential options for drill testing including undertaking its own drilling program on one or more targets or seeking a joint venture partner.