Combined mineralogy and chemistry on drill cores: challenging for on-line-real-time analyses - BRGM - Bureau de recherches géologiques et minières Access content directly
Conference Papers Year : 2017

Combined mineralogy and chemistry on drill cores: challenging for on-line-real-time analyses

Marco Zanatta
Monique Le Guen
  • Function : Author
Anne Salaün
  • Function : Author
Céline Rodriguez
  • Function : Author
Fabien Trotet
  • Function : Author
Mohamed Kadar
  • Function : Author
Karen Devaux
  • Function : Author
Thomas Lefèvre
Fons Eijkelkamp
  • Function : Author
Harm Nolte
  • Function : Author
Peter Koert
  • Function : Author

Abstract

In order to evaluate the instrumental parameters for the combined on-line-on-mine-real-time expert system SOLSA (http://www.solsa-mining.eu), portable and laboratory analyses were carried out on coarse granite, sandstone, serpentinized harzburgite and siliceous breccia. Each sample was studied at 5 different surface roughnesses (sonic or diamond drilled, cut, polished at 6 µm and 0.25 µm, sample powders). X-ray diffraction (XRD), portable Infra-Red (pIR) and X-ray-fluorescence (pXRF), and laboratory micro-Raman spectroscopy gave complementary and corroborating results. No major effect on the analyses was noted for the selected surface states. pXRF gave variable results except for the homogeneously serpentinized harzburgite, related to coarse or contrasting grain sizes or pores, small spot size (3 mm) and needs close-to-surface analyses. Portable IR (spot size 1.76 cm 2) is carried out close to surfaces while Raman spectroscopy (1-2 µm) is performed at distance. Sampling strategies have to be defined for each lithology. Major challenges for a combined on-line analysis are to adapt the specificities of the techniques to (1) analyse similar surface areas (from ~2 cm 2 (pIR) to < µm (Raman)), (2) smartly combine all the techniques into a single instrument, and (3) develop appropriate databases to reach a reliable " real-time " outcome results, which can be used for more precise geomodeling, and to rapidly define exploration and beneficiation parameters.

Domains

Geochemistry
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Dates and versions

hal-01536653 , version 1 (12-06-2017)

Identifiers

  • HAL Id : hal-01536653 , version 1

Cite

Cédric Duée, Nicolas Maubec, Valérie Laperche, Laure Capar, Anne Bourguignon, et al.. Combined mineralogy and chemistry on drill cores: challenging for on-line-real-time analyses. SGA Québec 2017, 14th biannual meeting, Aug 2017, Québec City, Canada. ⟨hal-01536653⟩
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