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Mineralogical and lithological unmixing with radiative transfer modelling in the open-pit context of Mine Canadian Malartic
- Source :
- Journal of Quantitative Spectroscopy and Radiative Transfer. 241:106707
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- In this study, Hapke's radiative transfer model is used to verify the feasibility of retrieving the composition and grain-size of the ground in an open-pit mine, seen as a regolith. Such a tool could be useful for dust surveys and thus preventing potential environmental risks such as acid mine drainage. As the true compositional endmembers of the medium are not retrieved but rather chosen from spectral libraries and the range of grain sizes (a few to hundreds of micrometers) and porosities (0.22 to 0.52 for the filling factor) vary greatly in an open-pit mine, we show that the mineralogical unmixing results are not reliable. Too many combinations of different relative abundances, grain sizes and porosities lead to fits between modelled and measured spectra under 0.3% in reflectance. To tackle this issue, we explore a lithological unmixing approach. Considering lithologies as endmembers, as opposed to considering minerals, reduces the variability in the solutions as fewer endmembers are used. The results show that the studied samples with multi-component grains behave spectrally as expected for mono-mineral grains. With no root mean square errors higher than 5%, the relative abundances retrieved are sufficiently precise to consider mapping lithologies with this method.
- Subjects :
- Radiation
010504 meteorology & atmospheric sciences
Lithology
Mineralogy
Context (language use)
Acid mine drainage
01 natural sciences
Regolith
Atomic and Molecular Physics, and Optics
Grain size
Root mean square
Atmospheric radiative transfer codes
Radiative transfer
Spectroscopy
Geology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 00224073
- Volume :
- 241
- Database :
- OpenAIRE
- Journal :
- Journal of Quantitative Spectroscopy and Radiative Transfer
- Accession number :
- edsair.doi...........52afd6db9b0cfd959dcf51a81e3125ce