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    Characterisation of gold ores by X-ray computed tomography - Part 1: Software for calibration and quantification of mineralogical phases

    Access Status
    Fulltext not available
    Authors
    Howard, L.
    Elangovan, P.
    Dominy, Simon
    Armstrong, R.
    Hezel, D.
    Abel, R.
    Date
    2011
    Type
    Conference Paper
    
    Metadata
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    Citation
    Howard, L. and Elangovan, P. and Dominy, S. and Armstrong, R. and Hezel, D. and Abel, R. 2011. Characterisation of gold ores by X-ray computed tomography - Part 1: Software for calibration and quantification of mineralogical phases, in Proceedings of the GeoMet 2011: 1st AusIMM International Geometallurgy Conference 2011, Sep 5-7 2011, pp. 321-330. Brisbane, Qld: AusIMM.
    Source Title
    GeoMet 2011 - 1st AusIMM International Geometallurgy Conference 2011
    ISBN
    9781921522505
    School
    Western Australian School of Mines
    URI
    http://hdl.handle.net/20.500.11937/11387
    Collection
    • Curtin Research Publications
    Abstract

    Micro-computed tomography (Micro-CT) is an X-ray imaging technique that produces highresolution 3D computerised 'virtual' models of geological specimens based on the X-ray attenuation of different materials in the specimen. The 'virtual' specimens are made up of voxels, the 3D equivalent of pixels, each assigned a gray value based on X-ray absorption. Micro-CT has enormous potential for allowing non-destructive, digital analysis of structure and composition when the mineralogical phases can be digitally separated. However, variation in X-ray flux between scans results in highly variable grayscale values for identical materials. Consequently, materials usually have to be segmented manually, which is subjective, inaccurate, labour-intensive and time consuming. Here we present a protocol and imaging software package that can be used to accurately and precisely extract quantifiable information in a repeatable and objective fashion. The software will allow the separation, visualisation, measurement and analysis of spatial and volumetric distribution of different mineral phases without damaging the specimen. This paper explains the potential use of this protocol and software package to ultimately allow automatic segmentation and quantification of gold in drill core samples, removing subjectivity and inaccuracies from data processing.

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