Gawler HyLogger™

• HyLogger™ description
• Related links

High Resolution Hyperspectral Analysis of Drill Core and Chips in the central Gawler Craton

Geoscience Australia's Gawler HyLogger™ hyperspectral program was set up as collaborative work with Primary Industries and Resources South Australia (PIRSA) and the Cooperative Research Centre for Landscape Environment and Mineral Exploration (CRCLEME) hyperspectral programs and with the CSIRO's Mineral Mapping Technologies Group.

Figure 1: Operating the HyLogger™. Gawler project officer Matt Peljo operating the HyLogger™ at the PIRSA core library during the 2003 logging campaign (courtesy PIRSA).

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HyLogger™ description

HyLogger™ studies were carried out as a component of spectral geology research in the Gawler project, with related spectral programs in ASTER, ASTER DEM and PIMA regolith mapping and bedrock signature tracing studies.

HyLogger™ is a high resolution core scanner which can intepret mineralogy of up to four dominant minerals as well as 2D and 3D profiling of alteration signatures from depth to surface.

HyLogger™ spectroscopic mineralogical logging and imaging of drill core and chips for the Gawler project was done in collaboration with PIRSA and CSIRO using a specialised version of The Spectral Geologist software called TSGCore.

Figure 2: The HyLogger™ log screen. An example of the HyLogger™ processing display screen showing the high resolution linescan image of the core and a linear representation of the spectra for each sample as well as various selected spectral and mineralogical scalars.

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Figure 3: The HyLogger™ log screen. Another example of the HyLogger™ log screen with the last two columns being gold in ppm followed by white mica intensity which is a useful tool to trace high gold as associated to different white mica species.

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Figure 4: HyLogger™ scatter plots. An example of the scatter plots display in HyLogger™ where simulated core tray layouts can be coloured by assay values or any spectral parameter as well as custom-made scalars.

• Mineralogical abundance and white mica and chlorite chemistry define spatial trends; and
• Copper associated with Iron chlorite bounded by distal muscovite.

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Figure 5: HyLogger™ prototype. CSIRO's prototype HyLogger™ system is comprised of an Operational Airborne Research Spectrometer (OARS) hyperspectral sensor mounted above a robotic core try table which allows rapid loading and scanning of both drillcores and chips (up to 1,000 metres a day).

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Figure 6: Central Gawler Gold. Areas Gawler project is currently processing HyLogger™ data: Barnes, Tarcoola, Tunkillia, Menninne Dam, Nuckulla Hill, and Weednana

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Figure 7: 3D projection. Example of 3D projection of a cluster of drillholes from the Central Gawler highlighting copper-lead-zinc rich zones.

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Related links

• Spectral geology
• Gawler Craton Datasets
• Maps and online GIS
• Gawler Craton 3D model
• Gawler Craton Mineral Promotion Publications