Showing results for: [ COE - 3D Mineral Mapping ]
The Rocklea Dome 3D Mineral Mapping project was conducted by the Western Australian Centre of Excellence for 3D Mineral Mapping from 2009 to 2012 to showcase the opportunities offered by existing hype... morerspectral remote and proximal sensing technologies for comprehensive minerals systems analyses.
Key achievements of the Rocklea Dome 3D Mineral Mapping project are (Haest et al., 2012 a,b; 2013):
•Quantification of iron oxide phases and associated mineralogy derived from hyperspectral data and validated using X-ray diffractometry and geochemistry:•iron (oxyhydr-)oxide content: RMSE of 9.1 wt % Fe
•Al clay content: RMSE 3.9 wt % Al2O3
•hematite/goethite ratio: RMSE 9.0 wt % goethite
•Spatial characterisation of vitreous vs. ochreus goethite
•Defining the Tertiary channel boundary using key mineralogical parameters, such as the kaolin crystallinity
•Modelling the iron ore resource of the Rocklea Dome CID
•Identification of drill holes that were sunk into barren (i.e. bedrock) lithologies, suggesting that about a third of drill holes could have been saved
•Detailed characterisation of clay mineralogy that is associated with distinct domains of the CID and its cover (i.e. kaolin group vs. Al-smectites vs. Fe-smectites)
•Characterisation of mineral assemblages in the Quaternary cover of the Tertiary channel (e.g. calcrete)
•Improvement of quality of mineral maps by application of vegetation unmixing methods
All of the above points showcase how hyperspectral data can be used for the whole of mine life cycle, from exploration to resource characterisation.
COE - 3D Mineral Mapping - Exploration Through Cover - Published 04 Jun 2020
The ASTER geoscience map of Australia is a set of digital geoscience products generated from satellite ASTER data. ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) is a Japanese ... moreimaging instrument on board USA’s TERRA satellite. The multispectral imaging sensor is the world’s first “geoscience tuned” satellite Earth Observing System. The ASTER geoscience maps of Australia represent the first continent-scale maps of the Earth’s surface mineralogy.
ASTER has 14 spectral bands spanning wavelengths sensitive to important rock forming minerals, including: Iron oxides; clays; carbonates; quartz; muscovite and chlorite.
Each ASTER image covers a 60 by 60 km area with individual pixel elements ranging from 15 to 90 m suitable for geoscience mapping from continent (1:2,500,000) down to mineral prospect (1:50,000) scale. The Australian mosaic is sourced from ~35,000 ASTER scenes with approximately 3500 used in the final mosaic.
The products are: False colour; CSIRO Landsat TM Regolith Ratios; Green vegetation content; Ferric oxide content; Ferric oxide composition; Ferrous iron index; Opaque index; AIOH group content; AIOH group composition; Kaolin group index; FeOH group content; MgOH group content; MgOH group composition; Ferrous iron content in MgOH/carbonate; Silica Index; Quartz Index; Gypsum Index.
COE - 3D Mineral Mapping - Mineral Mapping - Published 06 Mar 2020