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The resurrection of a biologically dead lake: a case study from northern Sweden
Envix Nord AB.
Umeå Universitet.
Boliden AB.
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2012 (English)In: Heavy Metals in the Environment: Selected Papers from the ICHMET-15 Conference / [ed] Jerome Nriagu, The Netherlands: Maralte Publishers , 2012Chapter in book (Refereed)
Abstract [en]

A major release of heavy metals to surface water in Sweden is derived from oxidation of sulfidic waste sand and waste rock. The Lake Hornträsket in Northern Sweden has experienced a gradual loss of fish over the last three decades caused by leaching from abandoned zinc–copper mines. In 2002, a semi-quantitative budget was brought forward which indicated one of three abandoned zinc–copper mines as the major source of metals to the lake. Copper has been identified as the main toxicant and the proximity of the Hornträsk mine to the lake allows little retention of copper before the drainage water reaches the lake. Several remediation measures such as diversion of drainage from upstream unpolluted areas and neutralization of the coarse sulfidic waste rock by injection and sprinkling with mesa-chalk (a waste product from paper mills) have been tested and found to be partially successful. This has resulted in decreasing levels of heavy metals in the lake and notably of copper concentrations. It has been found necessary to remove sulfide ore from some hot spots that could be identified by groundwater analysis from a dense network of piezometers. It is expected that the fish population will recover in 5–6 years as a result of the remediation.

Place, publisher, year, edition, pages
The Netherlands: Maralte Publishers , 2012.
, Progress in Environmental Science,Technology and Management, ISSN 1879-8756
Keyword [en]
mine tailings, oxidation, copper, aquatic toxicity, neutralisation
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-85528DOI: 10.5645/b.2.12ISBN: 978-94-90970-00-0ISBN: 978-94-90970-07-9OAI: diva2:500016

QC 20130109

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2013-01-09Bibliographically approved

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Jacks, Gunnar
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Environmental Geochemistry and Ecotechnology
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