Kalgoorlie surface mineral mapping using airborne hyperspectral data - MERIWA Project M370

To demonstrate the potential of this technology, this twelve month collaborative research project was established to evaluate whether airborne and satellite spectral data could be processed to deliver mineralogical products of value for mapping the regolith and possible metasomatic alteration for the 1:100 000 scale special mapsheet centred over Kalgoorlie-Boulder in Western Australia (WA).

The project delivered twenty-three mineral maps in GIS compatible format from twenty-six flight lines of airborne hyperspecteral imagery (HyMap™) that are now available through the Geological Survey of Western Australia (GSWA) or via download. The mineral abundance maps include regolith-related minerals, such as kaolin, iron oxide (hematite-goethite) and gypsum, as well as “fresh rock” minerals, such as muscovite, pyrophyllite, chlorite, talc and actinolite. Maps showing the chemistries of chlorite (Mg number) and muscovite (Al-content), as well as the water content of pixels rich in white mica, iron oxide and kaolin, were also generated.

These mineral maps are accompanied with metadata that provide scale bars relating the image colours to mineral abundances/chemistries. The image mineral abundances and chemistries were validated through comparison with laboratory spectral, mineralogical and geochemical analyses of over 250 field samples.







© Copyright 2009 CSIRO. Last updated: 15th July 2009