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Automated gold grain counting: a quantum leap in drift exploration

Néron Alexandre, Bédard L. Paul et Girard Réjean. (2017). Automated gold grain counting: a quantum leap in drift exploration. Dans : 14th SGA biennal meeting proceedings : Mineral resources to discover , August 20-23 2017, Québec City, Canada.

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Counting gold grains in glacial drift is a wellproven exploration technique. However, it is limited by the size of grains that can be recovered and observed, experiencing a recuperation collapse below 50 micrometres. Since ore petrography indicates the overwhelming abundance of very small gold grains, concentrating observation on the smaller fractions will improve accordingly the efficiency of the method. A dependable counting of very small particles is beyond the realm of human skill and requires automation. First, recovery must be conducted by methods which achieve constant concentration factors in the orders of 1:100,000 with constant recovery. Second the identification process requires the use of fully automated scanning techniques based on visible light image analysis and scanning electron microscope (SEM) interoperability. The technique here described enable recovery and counting of gold grains down to a few microns, plus the acquisition of high magnification images to characterize grain shape and EDSSDD analyses. Results not only enable the detection of faint gold grains dispersion trains, but also characterized the grains in regard of their source rocks taking into account their chemical signature and morphology. A new classification of “pristine” grains in regard of their relation to host minerals is proposed.

Type de document:Matériel de conférence (Non spécifié)
Date:20 Août 2017
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Unités de recherche > Laboratoire des Matériaux Terrestres
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Mots-clés:gold grain, automated counting, exploration, comptage automatisé, grains d'or
Déposé le:21 déc. 2021 00:58
Dernière modification:21 déc. 2021 00:58
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