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TZID:Europe/Berlin
TZUNTIL:20090329T010000Z
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DTSTART:20061029T030000
TZOFFSETFROM:+0200
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RDATE:20071028T030000
RDATE:20081026T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53321id
DTSTAMP:20260917T030919Z
DESCRIPTION:Mining activities generate large quantities of waste material\,
  known as mine tailings. In base-metal mines (Cu\, Zn\, Ni\, Pb\, etc.)\, 
 such tailings are often disposed of in open-air impoundments. They contain
  large amounts of pyrite\, which can easily undergo oxidation and generate
  acid-mine drainage (AMD). Several studies have looked at the microbial an
 d geochemical cycling of iron and sulfur in oxic tailings\, but very few h
 ave attempted to determine the driving factors behind Fe and S cycling in 
 the anoxic portion of the sediments. Past work in my laboratory has shown 
 that anaerobic bacteria\, mainly sulfate-reducing bacteria (SRB) and iron-
 reducing bacteria (FeRB) are present and active in mine tailings. Their re
 spective activity is however\, function of various physico-chemical factor
 s\, including temperature (seasonal fluctuations)\, pH and availability of
  both electron donors and acceptors. The presentation will focus on the re
 sults obtained so far for 2 types of sulfide-rich mine tailings\, i.e.\, a
 cidic Cu-Zn tailings and neutral Pb-Zn tailings in order to show that micr
 obial activity and the subsequent cycling of iron and sulfur at both sites
  are strongly dependent on the in situ chemical conditions of the sites. T
 he last portion of the presentation will briefly discuss the role SRB and 
 other bacteria in heavy metal (i.e.\, As and Hg) cycling in mine tailings.
DTSTART;TZID=Europe/Berlin:20070621T161500
DTEND;TZID=Europe/Berlin:20070621T235959
LOCATION:H6
SUMMARY:Prof. Dr. Danielle Fortin\, Environmental Geomicrobiology Group\, U
 niversity of Ottawa: Biogeochemical cycling of iron and sulfur in sulfide-
 rich mine tailings
TRANSP:TRANSPARENT
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