Förhöjda tungmetallkoncentrationer i Storjuktans sediment?: En jämförelse av metallkoncentrationer före och efter gruvbrytningen i Blaikengruvan
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
The impact on metal concentrations in Storjuktans sediment : How metals have varied before and after sulfide mining (English)
The main purpose of this study was to examine the effect on a lake as a result of sulfide mining. The mining industry leads to problems with acid mine drainage and leaching of heavy metals. This study examines concentrations of lead, copper, zinc and arsenic in the sediment of Lake Storjuktan close to the Blaikenmine. The main objective was to compare concentrations before mining operations started 2006 with samples from the same sediment basin 2015. Cores (n=2) was taken upstream and downstream the mining site at the same coordinates. To reveal spatial variations in concentrations six more sediment samples were taken. I found that; i) zinc concentration was distinctively higher in the surface sediment sampled in 2015 than 2006 while lead, copper and arsenic showed small to insignificant changes; ii) approximately an area of 22 hectare anthropogenic sediment has formed within Storjuktan with extremely high concentrations of zinc and high concentrations of lead and copper. In the latter case, the sediment was documented with an underwater camera. Lead isotope analysis of the anthropogenic sediment matched the lead ore at Blaiken. The conclusion of this study was that the mining has increased sediment concentrations of zinc in large parts of the lake and that contamination may at a local scale be of danger to aquatic organisms. However, more studies need to be conducted to evaluate the eventual ecological impact from sediment near the mining area and assess to what extent the regulated hydrological cycle may affects its fate.
Place, publisher, year, edition, pages
2015. , 15 p.
sulfide mining, heavy-metal drainage, sediment
IdentifiersURN: urn:nbn:se:umu:diva-104206OAI: oai:DiVA.org:umu-104206DiVA: diva2:818319
Subject / course
Examensarbete i miljö och hälsoskydd
Bachelor of Science in Environmental Health