“The structural detail of the Mawson intrusion that this survey has delivered is outstanding,” says Legend MD Mark Wilson.
Legend Mining Ltd (ASX:LEG) has completed the processing and modelling phase of the data from the 3D seismic survey over 6.5 square kilometres at the Mawson prospect within the Rockford Project, Fraser Range, Western Australia.
HiSeis field teams carried out the survey data collection in December 2021 and Legend is highly encouraged by the results.
Processing and modelling were completed with Barry Bourne from Terra Resources as external consultant.
Time and depth modelling has been completed, with the delivery of the final 3D cube.
Structural survey “outstanding”
Legend managing director Mark Wilson said: “The structural detail of the Mawson intrusion that this survey has delivered is outstanding.
“The seismic signature of the Mawson discovery zone is clearly evident in the modelled data and is replicated in an offset position below the Mawson fault.
“The Mawson chonolith also appears to extend at depth. These will be priority diamond drill targets when diamond drilling recommences in a couple of weeks’ time.”
“World-class outcome”
Terra Resources principal consultant Barry Bourne said: “A detailed geological and geophysical review led to the concept of seismic to further advance exploration at Mawson.
“Forward planning and modelling coupled with conventional seismic acquisition and advanced processing techniques have resulted in a world-class outcome as evidenced by the detail in this announcement.”
Compelling diamond drill target
The aim of the survey was to define the architecture of the Mawson intrusion in relation to the stratigraphic package, to a depth of investigation of a minimum 1,000 metres below surface across a 6.5 square kilometres area.
In addition, a more detailed survey on the western side of the survey area was designed to test for a direct detection signature of nickel-copper-cobalt sulphide accumulations at the Mawson discovery zone, given the shallow nature of mineralisation.
The seismic signature of the Mawson discovery zone is clearly evident and importantly appears to replicate in an offset position below the discovery zone, presenting a compelling diamond drill target.
Results
Results highlight the excellent correlation between the seismic dataset and the existing detailed constrained gravity inversion.
The newly acquired 3D seismic data supports the exploration model at Mawson, that a large intrusive source continues at depth below drilling completed to date.
Legend, in conjunction with consultants Terra Resources, MIRA Geoscience and HiSeis, is continuing to conduct the intensive process of interrogation, including incorporation of existing geophysical, geological, geochemical, and structural datasets.
The modelling to date has already identified multiple new drill targets, both outside, inside and below the existing drill coverage. The geological team is currently ranking new diamond drilling targets for an April start to the 2022 field season at Mawson.
Future Mawson programs
Seismic data modelling ongoing;
Incorporate completed drilling, geophysics, geochemistry, new structural model, and existing 3D modelling into seismic cube for diamond drilling target ranking and planning;
Statutory approvals; and
Diamond drilling planned for April 2022 start date.