Machine learning for mineral identification and ore estimation from hyperspectral imagery in tin-tungsten deposits : Simulation under indoor conditions
Lobo, Agustin (Geosciences Barcelona)
Garcia, Emma (Lithica)
Barroso, Gisela (Universitat Autònoma de Barcelona)
Martí, David (Lithica)
Fernandez-Turiel, Jose-Luis (Geosciences Barcelona)
Ibáñez-Insa, Jordi (Geosciences Barcelona)

Data:	2021
Resum:	This study aims to assess the feasibility of delineating and identifying mineral ores from hyperspectral images of tin-tungsten mine excavation faces using machine learning classification. We compiled a set of hand samples of minerals of interest from a tin-tungsten mine and analyzed two types of hyperspectral images: (1) images acquired with a laboratory set-up under close-to-optimal conditions, and (2) a scan of a simulated mine face using a field set-up, under conditions closer to those in the gallery. We have analyzed the following minerals: cassiterite (tin ore), wolframite (tungsten ore), chalcopyrite, malachite, muscovite, and quartz. Classification (Linear Discriminant Analysis, Singular Vector Machines and Random Forest) of laboratory spectra had a very high overall accuracy rate (98%), slightly lower if the 450-950 nm and 950-1650 nm ranges are considered independently, and much lower (74. 5%) for simulated conventional RGB imagery. Classification accuracy for the simulation was lower than in the laboratory but still high (85%), likely a consequence of the lower spatial resolution. All three classification methods performed similarly in this case, with Random Forest producing results of slightly higher accuracy. The user's accuracy for wolframite was 85%, but cassiterite was often confused with wolframite (user's accuracy: 70%). A lumped ore category achieved 94. 9% user's accuracy. Our study confirms the suitability of hyperspectral imaging to record the spatial distribution of ore mineralization in progressing tungsten-tin mine faces.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Hyperspectral imaging ; Machine learning ; Spectral geology
Publicat a:	Remote sensing (Basel), Vol. 13, Issue 16 (August 2021) , art. 3258, ISSN 2072-4292

DOI: 10.3390/rs13163258

18 p, 2.4 MB

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