Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The effects of backfilling and sealing the waste rock on water quality at the Kimheden open-pit mine, northern Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7291-8505
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2013 (English)In: Journal of Geochemical Exploration, ISSN 0375-6742, E-ISSN 1879-1689, Vol. 134, p. 99-110Article in journal (Refereed) Published
Abstract [en]

Evaluating the water quality at reclaimed mines affected by acid mine drainage is an essential step in assessing and improving the performance of mitigation techniques. At the Kimheden copper mine in northern Sweden, reclamation involved the progressive backfilling of waste rock into the two small open pits and, in 1996, the application of a till dry cover that included a sealing layer. The data from both the long-term water quality monitoring by the mining company and the repeated sampling of the surface water and groundwater in 2009 and 2010 were used to assess the success of the reclamation in mitigating the acid mine drainage production from the mine waste. A substantial decrease in the concentrations of copper, zinc and sulphate ions by 95%, 81% and 81%, respectively followed by a rapid stabilisation of element concentrations was observed at the outlet of the receiving stream since early reclamation times. This trend initially suggested successful results for the reclamation, though another explanation for the diminution of contaminant release through depletion of the limited sulphidic source could not be neglected. However, in spite of the decrease, post-reclamation metal concentrations in the stream are still not satisfactory for the discharge of the mine drainage into the natural environment, indicating that the mitigation measures were insufficient. Seepage from one of the pits in 2009 had dissolved copper, aluminium and zinc concentrations of 1.6 mg/L, 4.4 mg/L and 0.45 mg/L, respectively and a pH of 3.0. Relatively high dissolved oxygen concentrations in the groundwater of the backfill in 2009 and 2010 (> 2 mg/L) suggest that the mixed outcome of the mitigation actions is due to on-going oxidation in the backfilled waste rock despite the dry cover. Moreover, stream discharge and dissolved sulphate and magnesium used as natural tracers in the drainage showed that water management in the form of ditches is not appropriate. In particular, due to poor sealing of the ditches, whilst a measurable part of the contaminated drainage in the collecting ditch is leaking to groundwater and dispersing in the surrounding natural areas, the water discharged to a treatment pond at the outlet of the stream is mostly uncontaminated background water.

Place, publisher, year, edition, pages
2013. Vol. 134, p. 99-110
Keywords [en]
Earth sciences - Exogenous eart sciences
Keywords [sv]
Tillämpad geovetenskap, Geovetenskap - Exogen geovetenskap
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-15392DOI: 10.1016/j.gexplo.2013.08.003ISI: 000327908300009Scopus ID: 2-s2.0-84886593932Local ID: ee60fd47-67f9-466d-baa8-6c58644c25b6OAI: oai:DiVA.org:ltu-15392DiVA, id: diva2:988366
Note
Validerad; 2013; 20130816 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-11-22Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Villain, LucileAlakangas, LenaÖhlander, Björn

Search in DiVA

By author/editor
Villain, LucileAlakangas, LenaÖhlander, Björn
By organisation
Geosciences and Environmental Engineering
In the same journal
Journal of Geochemical Exploration
Geochemistry

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 374 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf