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

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Abstract

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
Pages1325
Number of pages1328
VolumeVolum 3
Edition15
ISBN (Print)9780852619643
Publication statusPublished - 27 Aug 2019

Fingerprint

mica
gold
hydrothermal fluid
shear zone
carbonate group
scapolite
inlier
tourmaline
mineral
crystallinity
protolith
carbonate rock
footprint
chlorite
fluid flow
craton
biotite
silicate
sulfide
mineralization

Keywords

  • Hyperspectral imaging
  • Gold deposit
  • Sadiola Hill
  • ITC-GOLD

Cite this

Martynenko, S., Tuisku, P., van Ruitenbeek, F. J. A., & Hein, K. (2019). High-resolution short-wave infrared hyperspectral characterization of alteration at the Sadiola Hill gold deposit, Mali, Western Africa. In 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits: Life with ore deposits on Earth (15 ed., Vol. Volum 3, pp. 1325). [Proceedings Volume 3] Glasgow: University of Glasgow.
Martynenko, Semyon ; Tuisku, Pekka ; van Ruitenbeek, F.J.A. ; Hein, Kim. / High-resolution short-wave infrared hyperspectral characterization of alteration at the Sadiola Hill gold deposit, Mali, Western Africa. 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits: Life with ore deposits on Earth. Vol. Volum 3 15. ed. Glasgow : University of Glasgow, 2019. pp. 1325
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keywords = "Hyperspectral imaging, Gold deposit, Sadiola Hill, ITC-GOLD",
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Martynenko, S, Tuisku, P, van Ruitenbeek, FJA & Hein, K 2019, High-resolution short-wave infrared hyperspectral characterization of alteration at the Sadiola Hill gold deposit, Mali, Western Africa. in 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits: Life with ore deposits on Earth. 15 edn, vol. Volum 3, Proceedings Volume 3, University of Glasgow, Glasgow, pp. 1325.

High-resolution short-wave infrared hyperspectral characterization of alteration at the Sadiola Hill gold deposit, Mali, Western Africa. / Martynenko, Semyon; Tuisku, Pekka; van Ruitenbeek, F.J.A.; Hein, Kim.

15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits: Life with ore deposits on Earth. Vol. Volum 3 15. ed. Glasgow : University of Glasgow, 2019. p. 1325 Proceedings Volume 3.

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

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AU - Martynenko, Semyon

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AU - Hein, Kim

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N2 - 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.

AB - 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.

KW - Hyperspectral imaging

KW - Gold deposit

KW - Sadiola Hill

KW - ITC-GOLD

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Martynenko S, Tuisku P, van Ruitenbeek FJA, Hein K. High-resolution short-wave infrared hyperspectral characterization of alteration at the Sadiola Hill gold deposit, Mali, Western Africa. In 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits: Life with ore deposits on Earth. 15 ed. Vol. Volum 3. Glasgow: University of Glasgow. 2019. p. 1325. Proceedings Volume 3