High-resolution short-wave infrared hyperspectral characterization of alteration at the Sadiola Hill gold deposit, Mali, Western Africa

Semyon Martynenko*, Pekka Tuisku, F.J.A. van Ruitenbeek, Kim Hein

*Corresponding author for this work

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

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Sadiola Hill is an ~8 Moz gold deposit located in western Mali within a ca. 2200-2050 Ma tectonic window known as Kédougou-Kénieba inlier (KKI), exposing the Western African craton. The deposit is hosted in a metasedimentary package made up of impure carbonate rocks, wackes, and arenites intruded by three distinct igneous phases. A N-S-trending Sadiola shear zone, related to the regional Senegal-Mali shear zone, and NNE-trending third order fault splays acted as conduits for auriferous hydrothermal fluid flow. The deposit has undergone a complex poly-phase alteration history. Alteration assemblages related to gold mineralization consist of biotite-carbonate-quartz-sulphide. Other assemblages include calc-silicates, chlorite, white mica, scapolite, and tourmaline (Hein and Tshibubudze 2007; Cameron 2010; Masurel et al. 2017). Current research is aimed at characterising alteration at the mineral-scale, as well as assessment of cooling trend(s) and alteration footprint(s) with high-resolution short-wave infrared (SWIR) hyperspectral scanning. In addition to detailed mineralogical classification, changes in fluid chemical parameters are determined with variations in white mica, namely, the position of Al-OH bond in the SWIR range and white mica crystallinity. Furthermore, hydrothermal fluid chemistry is assessed with Fe2+ content in carbonate group minerals. Protolith control on alteration expression is also investigated.
Original languageEnglish
Title of host publication15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits
Subtitle of host publicationLife with ore deposits on Earth
Place of PublicationGlasgow
PublisherUniversity of Glasgow
ChapterNew Techniques for Ore Discovery
Number of pages1328
VolumeVolum 3
ISBN (Print)9780852619643
Publication statusPublished - 27 Aug 2019


  • Hyperspectral imaging
  • Gold deposit
  • Sadiola Hill


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