Identification Of As-bearing Minerals
Associated With Mine Wastes From Former
Metalliferous Mines In France Using
Laboratory Reflectance Spectra
Author(s)
V. Carrère
Abstract
Arsenopyrite-rich wastes from former metalliferous mines in the Massif Central
Region, France, contribute, through intensive leaching, to the formation of thin
layers of As-Fe crusts on the tailing surfaces acting as a cement. When subject to
rainfall, acid mine drainage develops, As is remobilized and trapped secondarily
by oxyhydroxides or sulphates such as goethite, hematite, jarosite, etc.,
depending on water pH. The aim of this study is to assess the potential of
hyperspectral remote sensing in this particular environment (small outcrops,
important leaching process, vegetated environment). Samples were collected in
the field from tailings and stream bottoms in various sites. Reflectance spectra of
the samples were acquired in the laboratory using a field spectrometer under
artificial illumination (0.4–2.5 µm spectral range). Mineral composition was
estimated by comparing reflectance spectra to reference spectral libraries. This
was done after continuum removal, using two different techniques, in order to
minimize the influence of factors such as grain size or moisture content.
Geochemical and SEM-EDS analyses were performed to gather information on
the mineralogy. Preliminary results from spectral analyses show clear evidence
of jarosite, goethite or limonite, schwertmannite and scheelite in various
proportions, depending on crust types, confirmed by SEM-EDS analyses.
Keywords: surface spectral reflectance, mine wastes, continuum removal, iron
oxyhydroxides.
Keywords
surface spectral reflectance, mine wastes, continuum removal, iron
oxyhydroxides.
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