Using hyperspectral imaging to vector towards mineralization at the Canadian Malartic gold deposit, Québec, Canada

Lypaczewski, Philip; Rivard, Benoît; Gaillard, Nicolas; Perrouty, Stéphane; Piette-Lauzière, Nicolas; Bérubé, Charles L.; Linnen, Robert L.

doi:10.1016/j.oregeorev.2019.102945

Cited by 35 publications

(13 citation statements)

References 37 publications

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“…The methodological study presented here, with a wavelength accuracy greater than 1 nm 7 , 41 , tested whether hyperspectral imaging can be used to discriminate a narrow range of dolomite stoichiometries and textures in a Middle Cambrian succession. We distinguished five phases of dolomite, ranging from 49.67 to 50.21%Ca, that are approaching a stoichiometric, well-ordered endmember following 100’s of millions of years of diagenesis and several kilometers of burial 23 – 26 .…”

Section: Discussionmentioning

confidence: 99%

“…The empirical line method has the advantage of correcting for the influence of the atmosphere on the target radiance 38 – 40 . In contemporaneous studies with the same camera 7 , 41 , the wavelength position of SWIR absorptions of a National Institute of Standards and Technology referenced Mylar standard were accurate within 1 nm.…”

Section: Methodsmentioning

confidence: 97%

“…Hyperspectral imaging involves the collection and analysis of reflectance data in the form of many, narrow and contiguous, spectral bands 1 , 2 . Laboratory-, field-, and satellite-based spectroscopy are well-established methods with numerous geological applications, including lithological mapping 3 , 4 , mineral prospectivity 5 – 7 , and environmental monitoring 8 , 9 . The application of such methods to carbonate rocks, however, is limited, with previous research largely focusing on the measurement of the laboratory-based spectral characteristics of minerals 10 – 13 and their abundance in rocks 14 – 16 .…”

Section: Introductionmentioning

confidence: 99%

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Shortwave infrared hyperspectral imaging as a novel method to elucidate multi-phase dolomitization, recrystallization, and cementation in carbonate sedimentary rocks

McCormick

Corlett

Stacey

et al. 2021

Sci Rep

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Carbonate rocks undergo low-temperature, post-depositional changes, including mineral precipitation, dissolution, or recrystallisation (diagenesis). Unravelling the sequence of these events is time-consuming, expensive, and relies on destructive analytical techniques, yet such characterization is essential to understand their post-depositional history for mineral and energy exploitation and carbon storage. Conversely, hyperspectral imaging offers a rapid, non-destructive method to determine mineralogy, while also providing compositional and textural information. It is commonly employed to differentiate lithology, but it has never been used to discern complex diagenetic phases in a largely monomineralic succession. Using spatial-spectral endmember extraction, we explore the efficacy and limitations of hyperspectral imaging to elucidate multi-phase dolomitization and cementation in the Cathedral Formation (Western Canadian Sedimentary Basin). Spectral endmembers include limestone, two replacement dolomite phases, and three saddle dolomite phases. Endmember distributions were mapped using Spectral Angle Mapper, then sampled and analyzed to investigate the controls on their spectral signatures. The absorption-band position of each phase reveals changes in %Ca (molar Ca/(Ca + Mg)) and trace element substitution, whereas the spectral contrast correlates with texture. The ensuing mineral distribution maps provide meter-scale spatial information on the diagenetic history of the succession that can be used independently and to design a rigorous sampling protocol.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Shortwave infrared hyperspectral imaging as a novel method to elucidate multi-phase dolomitization, recrystallization, and cementation in carbonate sedimentary rocks

McCormick

Corlett

Stacey

et al. 2021

Sci Rep

Self Cite

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“…Numerous studies have shown that the aluminum hydroxyl (Al-OH) absorption of sericite (white mica) near 2200 nm can be used to estimate its Al VI content [15,[29][30][31][32][33] . And the absorption position varies from 2190 nm to 2225 nm [34] , which can be used to distinguish Al-poor, Al-medium and Al-high sericite [15,16] .…”

Section: Methodsmentioning

confidence: 99%

Application of Gaofen-5 Hyperspectral Data in Uranium Exploration: A Case Study of Weijing in Inner Mongolia, China

Zhang

Pan

2021

Preprint

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Gaofen-5 (GF-5) satellite is the world's first full-spectrum hyperspectral satellite to achieve comprehensive observations of the atmosphere and land. The Advanced Hyperspectral Imager (AHSI) carried by GF-5 can acquire 330-chanel imagery covering 390 - 2500 nm. However, the application of GF-5 AHSI imagery in uranium exploration is currently unknown. In this paper, the AHSI imagery was used for prospecting uranium mineralization in the Weijing, Inner Mongolia, China. The matched filter (MF) and threshold segmentation were used for mapping goethite, Al-high, Al-medium and Al-poor sericite. And the principal component analysis (PCA) and gray-level co-occurrence matrix (GLCM) were used to extract the texture information of the study area. Subsequently, combined with geological information, the relationship between alteration information, texture complexity and uranium mineralization was discussed, and it was pointed out that goethite, Al-medium, Al-poor sericite and texture complexity in this area can be used as indicators of uranium mineralization. Finally, three prospects were delineated, which will guide the follow-up uranium exploration in this area and promote the application of GF-5 AHSI data.

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“…Previous studies have suggested the combined use of geochemical and hyperspectral data for the interpretation and validation of the results [25], [39], [41]- [44]. For example in [42], the geochemical and hyperspectral data sets are processed and analysed separately and their results are compared and used for a complete understanding and analysis of the correlation between stratigraphic control as well as mineralogical alterations.…”

Section: Introductionmentioning

confidence: 99%

Drill-Core Hyperspectral and Geochemical Data Integration in a Superpixel-Based Machine Learning Framework

Acosta

Khodadadzadeh

Tolosana‐Delgado

et al. 2020

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Using hyperspectral imaging to vector towards mineralization at the Canadian Malartic gold deposit, Québec, Canada

Cited by 35 publications

References 37 publications

Shortwave infrared hyperspectral imaging as a novel method to elucidate multi-phase dolomitization, recrystallization, and cementation in carbonate sedimentary rocks

Shortwave infrared hyperspectral imaging as a novel method to elucidate multi-phase dolomitization, recrystallization, and cementation in carbonate sedimentary rocks

Application of Gaofen-5 Hyperspectral Data in Uranium Exploration: A Case Study of Weijing in Inner Mongolia, China

Drill-Core Hyperspectral and Geochemical Data Integration in a Superpixel-Based Machine Learning Framework

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