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Formation and composition of cemented layers in low-sulphide mine tailings, Laver, northern Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7291-8585
2006 (English)In: Environmental Geology, ISSN 0943-0105, E-ISSN 1432-0495, Vol. 50, no 6, p. 809-819Article in journal (Refereed) Published
Abstract [en]

Cemented layers (hardpans) are common in carbonate or sulphide-rich mine tailings and where pyrrhotite is the predominating Fe-sulphide. Laver, northern Sweden, is an abandoned Cu-mine where the tailings have low pyrrhotite content, almost no pyrite and no carbonates. Two cemented layers at different locations in the Laver tailings impoundment were investigated, with the aim to determine their effects on metal mobility. The cementing agents were mainly jarosite and Fe-oxyhydroxides in the layer formed where the tailings have a barren surface, whereas only Fe-oxyhydroxides were identified below grass-covered tailings surface. Arsenic was enriched in both layers which also exhibit high concentrations of Mo, V, Hg and Pb compared to unoxidised tailings. Sequential extraction indicates that these metals and As were mainly retained with crystalline Fe-oxides, and therefore potentially will be remobilised if the oxic conditions become more reducing, for instance as a result of remediation of the tailings impoundment.

Place, publisher, year, edition, pages
2006. Vol. 50, no 6, p. 809-819
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-15146DOI: 10.1007/s00254-006-0253-xISI: 000239296700005Scopus ID: 2-s2.0-33746407199Local ID: ea07bd10-6ddc-11db-83c6-000ea68e967bOAI: oai:DiVA.org:ltu-15146DiVA, id: diva2:988119
Note
Validerad; 2006; 20061106 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Alakangas, LenaÖhlander, Björn

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