St George Mining Limited (ASX: SGQ) has identified another significant target for nickel-copper sulphides identified from the seismic survey recently completed at its flagship high-grade Mt Alexander Project, located in the north-eastern Goldfields of Western Australia.
Executive Chairman, John Prineas, said the first-ever seismic survey at Mt Alexander continues to deliver strong results with another outstanding new target for a potential massive sulphide deposit. “The north-south seismic lines completed at Mt Alexander straddled the Cathedrals Belt and stretched to the north into our 100%-owned Exploration Licence 29/548, where an underexplored east-west oriented structure – the Transits Belt – has been identified by shallow drilling,” he said.
“Importantly, Cathedrals Belt style host lithologies were also confirmed in the drilling. “The seismic data has mapped the Transits Belt structure as dipping to the north, similar to the highly mineralised intrusive-host structure in the Cathedrals Belt to the south.
“S2 – the new, large target identified in the Transits Belt – has the same seismic properties as S1 in the Cathedrals Belt and just like S1 is interpreted to be a target for massive nickel-copper sulphides. “We are very excited to have two robust targets lined up for immediate drilling in our 2022 diamond drill programme.”
Targets
The ongoing modelling and interpretation of the seismic survey data have resulted in the identification of a second compelling target for potential massive sulphide mineralisation. Data acquisition and processing for the Mt Alexander seismic survey was completed by independent contractors Apex Geo Pty Ltd and Dayboro Geophysical Pty Ltd, respectively.
Interpretation of the seismic data has been completed by independent consultants, Rock Solid Seismic. The principal of Rock Solid Seismic, Mr Graeme Hird, has industry leading credentials in hard rock seismic projects. Prior to launching Rock Solid Seismic, Mr Hird was Principal Interpretation Geologist at HiSeis – one of the largest hard rock seismic consulting firms in Australia.
Further exciting results from the seismic at Mt Alexander: The three north-south seismic lines completed at Mt Alexander commenced to the south of the east-west Cathedrals Belt and continued north into E29/548 (100% St George), where underexplored structures parallel to the Cathedrals Belt are situated.
Interpretation of the data from the centre line in the seismic survey (Line 2) has resulted in the identification of a large, new target – S2 – that has seismic properties consistent with the shallow massive sulphides drilled in the Cathedrals Belt. S2 is located down-dip in the Transits Belt structure, an east-west trending north dipping structure which has many affinities to the Cathedrals Belt.
It is the most prominent of the east-west structures identified on E29/548. The target is located approximately 350m below surface and has a dip extent of 400m.
The reflective properties of S2 are consistent with the reflective properties of the known massive sulphides that lie along Line 1 of the seismic survey.
Previous shallow drilling by St George has intersected ultramafics in the Transits Belt, giving further support that the structure has potential to host high-grade mineralisation similar to the Cathedrals Belt structure to the south.
Deep-seated intrusive network: The seismic data shows the Transits Belt structure and the Cathedrals Belt structure dipping to the north and converging at more than 1,000m below surface into what is interpreted to be a larger mantle-tapping structure, which would have been a primary conduit through which intrusive rocks and nickel-copper sulphide mineralisation travelled to the surface.
Deep magmatic structures of this kind are indicative of a large mineral system with the potential to host significant volumes of mineralisation.
Modelling and interpretation of the seismic data are continuing and it is anticipated that further material findings will be delivered that will assist ongoing exploration.
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