Published September 4, 2023 | Version v1
Conference paper Open

Going the extra mile - Julimar, a case study from Western Australia

  • 1. Seequent, Skolegade 21, 8000 Aarhus C, Denmark, Camilla.soerensen@seequent.com
  • 2. CSIRO, 26 Dick Perry Avenue, Kensington, Australia, Tim.munday@csiro.au
  • 3. Seequent, Skolegade 21, 8000 Aarhus C, Denmark, toke.soeltoft@seequent.com

Description

The Julimar Complex, which is located in Western Australia, hosts the recently discovered Gonneville deposit which contains massive sulphide mineralisation (Pd, Pt, Ni, Cu and Co). The deposit was discovered by using a moving loop EM survey and follow up geophysics including AEM confirmed the find. In this study we use a SkyTEM AEM line which was acquired as part of the AUS-AEM initiative, which cross the Gonneville deposit. The objective is to extract as much information from that data as possible to demonstrate that AEM can be used for general geological mapping in addition to anomaly detection. By using several inversion methods and analysing the results we get an understanding of the most believable model. In addition to a deterministic full non-linear inversion of the data, we also use a stochastic reverse jump Monte carlo Markov Chain inversion on the SkyTEM data. The results from both algorithms are comparable and correlate well with the known geological information published by Chalice mining, based on drill holes and other geophysical surveys. Using Airborne EM for exploring for minerals under cover could provide a lot more information about the subsurface than just mapping highly conductivity sulphide mineralisation zones.

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Open-Access Online Publication: November 3, 2023

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