Stage 1 : Mount Isa HyMap Project
This stage involved the collection and mineralogical processing of 8250 km2 of airborne HyMap data from along nine structural corridors 15 km wide across the Mount Isa region (see Figure 2). The main objective of the project included:
- Delivering a GIS-compatible suite of remote sensing derived mineral products;
- Validation of these mineral products through ground sampling and associated analyses;
- Assessing the geological/exploration significance of the mineral products for mapping alteration associated with the known regional structures;
- Generate data that may assist fluid flow modelling and other research tools used to identify new exploration targets.
The GIS-compatible HyMap derived geoscience products include the following:
- Natural and false colour
- Iron oxide abundance and the hematite-goethite ratio
- Kaolin abundance and crystallinity
- Al-smectite abundance
- White mica (paragonite-muscovite-phengite) abundance, composition (Al Tschermak substitution) and crystallinity (Figure 3)
- Carbonate abundance and composition
- Ferric/ferrous iron content in selected minerals (e.g. carbonate)
- Water content in selected minerals (e.g. micas)
- Opaques (carbon, sulphides, ferrous oxides)
ASTER geoscience products
In collaboration with pmd*CRC, the GSQ-CSIRO team have also been working with Geoscience Australia on developing tools for multi-scene processing of satellite ASTER imagery. One of the outcomes has been the development of prototype software and the generation of a calibrated reflectance ASTER image mosaic of the Mount Isa Block and derived geoscience products based on 130 ASTER scene, calibrated/validated using the airborne HyMap data.
The ASTER geoscience products include:
- Ferric oxide content;
- Ferrous iron in silicates/carbonates
- AlOH mineral group content and composition
- MgOH mineral group content and composition
The full suite of HyMap and ASTER derived geoscience products in ECW and JPEG2000 format together with their image metadata and associated field/laboratory data are available for anonymous ftp download via ftp://ftp.csiro.au/arrc/.
The final report is available as a PDF click here to download.
Figure 2: ASTER image mosaic of the Mount Isa region and showing the location of the nine blocks of Stage 1 airborne HyMap coverage.
Figure 3: Example of airborne HyMap imagery from Block H processed to deliver different information about white mica.