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

L. E. Howard, P. Elangovan, S. C. Dominy, R. Armstrong, D. Hezel, R. L. Abel

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationGeoMet 2011 - 1st AusIMM International Geometallurgy Conference 2011
Pages321-330
Number of pages10
Publication statusPublished - 2011
Externally publishedYes
EventInternational Geometallurgy Conference 2011 - Brisbane, Australia
Duration: 5 Sep 20117 Sep 2011
http://www.ausimm.com.au/geomet2011/home.asp

Conference

ConferenceInternational Geometallurgy Conference 2011
Abbreviated titleGeoMet 2011
CountryAustralia
CityBrisbane
Period5/09/117/09/11
Internet address

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