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TitreMineral markers of base metal mineralization: progress report on the identification of indicator minerals in the fine heavy mineral fraction
TéléchargerTéléchargement (publication entière)
AuteurLougheed, H D; McClenaghan, M B; Layton-Matthews, D
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 2; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8373, 2018 p. 101-108,
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 2, Commission géologique du Canada, Dossier public 8373
Sujetsgisements minéraux; prospection minière; méthodes d'exploration; métaux de base; gisements porphyriques; genèse des minerais; minéralisation; analyses des minéraux lourds; analyses granulométriques; fractionation; dépôts glaciaires; tills; alluvions; échantillons de sédiment de cours d'eau; Méthodologie; géologie économique; géologie des dépôts meubles/géomorphologie; minéralogie
Illustrationstables; photographs; schematic representations; photomicrographs
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes porphyriques, Initiative géoscientifique ciblée (IGC-5)
Diffusé2018 03 01
Résumé(disponible en anglais seulement)
Indicator minerals from heavy mineral concentrates have long been used in exploration for diamonds and gold, and more recently porphyry copper and volcanic massive sulphide deposits. This study is investigating the application of rapid automated mineralogy to identify and characterize indicator minerals in till and stream sediment samples. The fine (<0.250 mm) heavy mineral fraction is well suited to automated mineralogy as a large number of mineral grains can be analyzed from an individual sample. These small grains are difficult to visually recognize using traditional microscopic methods.
The initial phase of this study has assessed methods to process and analyze the <0.250 mm heavy mineral concentrate using archived samples from three test sites. Investigations focused on identifying key areas of loss and contamination during processing and workflow, and establishing mitigating protocols. Concentrates were split into four size fractions to better represent the large number of grains in a sample. Single-use sieves were developed to reduce potential for cross-contamination. Fractions were mounted into an epoxy plug, which were quartered and remounted to capture both basal and cross-sectional planes to compensate for any density settling, prior to rapid automated scanning by mineral liberation analysis.