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Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia

Created 19/11/2025

Updated 19/11/2025

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The results of a pilot study into the application of an unsupervised clustering approach to the analysis of catchment-based National Geochemical Survey of Australia (NGSA) geochemical data combined with geophysical and geological data across northern Australia are documented. NGSA Mobile Metal Ion® (MMI) element concentrations and first and second order statistical summaries across catchments of geophysical data and geological data are integrated and analysed using Self-Organising Maps (SOM). Input features that contribute significantly to the separation of catchment clusters are objectively identified and assessed. A case study of the application of SOM for assessing the spatial relationships between Au mines and mineral occurrences in catchment clusters is presented. Catchments with high mean Au code-vector concentrations are found downstream of areas known to host Au mineralisation. This knowledge is used to identify upstream catchments exhibiting geophysical and geological features that indicate likely Au mineralisation. The approach documented here suggests that catchment-based geochemical data and summaries of geophysical and geological data can be combined to highlight areas that potentially host previously unrecognised Au mineralisation. Citation: M. J. Cracknell, P. de Caritat; Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia. Geochemistry: Exploration, Environment, Analysis 2017; 17 (3): 204–216. doi: https://doi.org/10.1144/geochem2016-012 This article appears in multiple journals (Lyell Collection & GeoScienceWorld)

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Field Value
Title Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/f0876518-5525-4a55-a8db-daa614c23f37
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 28/03/2017
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Catchment-based gold prospectivity analysis combining geochemical, geophysical and geological data across northern Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/catchment-based-gold-prospectivity-analysis-combining-geochemical-geophysical-and-geological-da1