Mineralogical and geochemical characterisation of open-air tailing and waste-rock dumps from the Libiola Fe-Cu sulphide mine (Eastern Liguria, Italy)

Active acid mine drainage (AMD) processes at the Libiola Fe-Cu sulphides mine are mainly triggered by water-rock interaction occurring within open-air tailing and waste-rock dumps. These processes are mainly controlled by exposure to weathering agents, the grain size of the dumped materials, and by...

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Published in:Environmental earth sciences 2008-02, Vol.53 (8), p.1613-1626
Main Authors: Marescotti, P, Carbone, C, De Capitani, L, Grieco, G, Lucchetti, G, Servida, D
Format: Article
Language:English
Subjects:
Acid mine drainage
Acidification
Acidity
AMD
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental geology
Exact sciences and technology
Geochemistry
Geology
Libiola mine
Light microscopy
Mine tailings
Minerals
Original Article
Pollution, environment geology
Rocks
Studies
Sulfides
Sulphides oxidation
Tailing dumps
Waste dumps
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description Active acid mine drainage (AMD) processes at the Libiola Fe-Cu sulphides mine are mainly triggered by water-rock interaction occurring within open-air tailing and waste-rock dumps. These processes are mainly controlled by exposure to weathering agents, the grain size of the dumped materials, and by the quantity of sulphides, the sulphide types, and their mode of occurrence. Due to these factors, several paragenetic stages of evolution have been recognised at different depths at different sites and within the same site. The dump samples were investigated with mineralogical (reflected- and transmitted-light optical microscopy, XRPD, and SEM-EDS) and geochemical (ICP-AES, Leco) techniques. The AMD evaluation of the tailing and waste-rock samples was performed by calculating the Maximum Potential Acidity, the Acid Neutralising Capacity, (and the Net Acid Producing Potential. The results allowed us to demonstrate that the open-air tailings had already superseded their AMD apex and are now practically inert material composed mainly of stable goethite ± lepidocrocite ± hematite assemblages. On the contrary, the sulphide-rich waste rocks still have a strong potential to produce long term AMD, causing the acidification of circulating waters and the release of several hazardous elements.
doi_str_mv 10.1007/s00254-007-0769-8
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identifier ISSN: 0943-0105
ispartof Environmental earth sciences, 2008-02, Vol.53 (8), p.1613-1626
issn 0943-0105
1866-6280
1432-0495
1866-6299
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source Springer Nature
subjects Acid mine drainage
Acidification
Acidity
AMD
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental geology
Exact sciences and technology
Geochemistry
Geology
Libiola mine
Light microscopy
Mine tailings
Minerals
Original Article
Pollution, environment geology
Rocks
Studies
Sulfides
Sulphides oxidation
Tailing dumps
Waste dumps
title Mineralogical and geochemical characterisation of open-air tailing and waste-rock dumps from the Libiola Fe-Cu sulphide mine (Eastern Liguria, Italy)
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