Several features of interest are apparent in the new data, including a gravity anomaly (G2) lying north of Jupiter. Notably, G2 lies on a prominent north-northwesterly trending lineament that parallels the structural trend of the copper-gold mineralised
Experienced geophysical contractor, Haines Surveys, completed field readings prior to Christmas 2019. High quality semi-detailed 500m x 200m spaced gravity data was collected between Jupiter and existing 500m x 100m spaced gravity data to the south. Prior to the current gravity survey there was only 2 km spaced gravity data available that was insufficiently detailed to allow meaningful interpretation.
As reported earlier, open file gravity data available on the SARIG website showed a distinctive circular gravity anomaly (G1) about 2 km across lying roughly 5 km south of the MT survey line (refer to ASX announcement of
Since the MT survey was the result of 2 km spaced readings along a single survey line, the north-south extent of the Jupiter conductive zone is not certain at this stage. Additional short MT survey lines are required to achieve more detail for the Jupiter conductive zone. New MT data, to be collected in the future, will be combined with the gravity and other geophysical data with the objective of defining a drilling target to test Jupiter.
Commenting on the results of the recent gravity survey, Havilah's Technical Director, Dr
'Our new gravity survey provides independent supporting data in the form of two discrete gravity anomalies lying on a regional north-northwesterly trending lineament that is coincident with the MT conductive zone.
'Our aim is to narrow down the geophysical indicators to a specific drilling target and the results of the present gravity survey will assist us in that regard' he said.
About Jupiter and MT geophysics
Jupiter was identified by Professor
MT is a geophysical method that relies on measuring the very small natural time variations of the Earth's magnetic and electric fields to determine the electrical resistivity in the subsurface. The method is able to distinguish zones of varying electrical conductivity in the earth's crust to depths of more than 20 km. It is a powerful technique because it can potentially identify major conductive zones in the earth's crust that could represent the feeder zones to large metal accumulations. For example, research work in the Gawler Craton has identified a large conductive zone at depth beneath the
About gravity surveying
Gravity measurements are influenced by the density of underlying rocks in relation to the earth's surface. Hence, at a given depth denser rocks (which can include metalliferous deposits or their host rocks) will generate a positive gravity anomaly or gravity high at surface. Circular gravity features can sometimes indicate intrusive igneous rocks or a pipe-like alteration zone that can be host to mineralisation. While the source of the circular gravity features identified in this announcement are unknown at this stage, it does indicate the potential usefulness of gravity as a targeting tool in this region.
Contact:
Email: info@havilah-resources.com.au
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