PMID- 15223665
OWN - NLM
STAT- MEDLINE
DCOM- 20040921
LR  - 20131121
IS  - 1025-6016 (Print)
IS  - 1025-6016 (Linking)
VI  - 40
IP  - 2
DP  - 2004 Jun
TI  - Sources and circulation of water and arsenic in the Giant Mine, Yellowknife, NWT, 
      Canada.
PG  - 115-28
AB  - Recovery of gold from arsenopyrite-hosted ore in the Giant Mine camp, 
      Yellowknife, NWT, Canada, has left a legacy of arsenic contamination that poses 
      challenges for mine closure planning. Seepage from underground chambers storing 
      some 237,000 tonnes of arsenic trioxide dust, has As concentrations exceeding 
      4000 ppm. Other potential sources and sinks of As also exist. Sources and 
      movement of water and arsenic are traced using the isotopes of water and 
      sulphate. Mine waters (16 ppm As; AsV/AsIII approximately 150) are a mixture of 
      two principal water sources--locally recharged, low As groundwaters (0.5 ppm As) 
      and Great Slave Lake (GSL; 0.004 ppm As) water, formerly used in ore processing 
      and discharged to the northwest tailings impoundment (NWTP). Mass balance with 
      delta18O shows that recirculation of NWTP water to the underground through faults 
      and unsealed drillholes contributes about 60% of the mine water. Sulphate serves 
      to trace direct infiltration to the As2O3 chambers. Sulphate in local, low As 
      groundwaters (0.3-0.6 ppm As; delta34SSO4 approximately 4% and delta18OSO4 
      approximately -10%) originates from low-temperature aqueous oxidation of 
      sulphide-rich waste rock. The high As waters gain a component of 18O-enriched 
      sulphate derived from roaster gases (delta18OSO4) = + 3.5%), consistent with 
      their arsenic source from the As2O3 chambers. High arsenic in NWTP water 
      (approximately 8 ppm As; delta18OSO4 = -2%) derived from mine water, is 
      attenuated to close to 1 ppm during infiltration back to the underground, 
      probably by oxidation and sorption by ferrihydrite.
CI  - Copyright 2004 Taylor and Francis Ltd.
FAU - Clark, Ian D
AU  - Clark ID
AD  - Department of Earth Sciences University of Ottawa 140 Louis Pasteur Ottawa ON K1N 
      6N5 Canada. idclark@uottawa.ca
FAU - Raven, Kenneth G
AU  - Raven KG
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - Isotopes Environ Health Stud
JT  - Isotopes in environmental and health studies
JID - 9602611
RN  - 0 (Soil Pollutants)
RN  - 0 (Water Pollutants)
RN  - 7440-57-5 (Gold)
RN  - E1UOL152H7 (Iron)
RN  - N712M78A8G (Arsenic)
SB  - IM
MH  - Arsenic/*analysis
MH  - Environmental Monitoring
MH  - Filtration
MH  - *Gold
MH  - Iron/chemistry
MH  - *Mining
MH  - Northwest Territories
MH  - Oxidation-Reduction
MH  - Soil Pollutants/*analysis
MH  - Temperature
MH  - *Water Movements
MH  - Water Pollutants/*analysis
EDAT- 2004/06/30 05:00
MHDA- 2004/09/24 05:00
CRDT- 2004/06/30 05:00
PHST- 2004/06/30 05:00 [pubmed]
PHST- 2004/09/24 05:00 [medline]
PHST- 2004/06/30 05:00 [entrez]
AID - 7ECVY7VFKVE2GXJY [pii]
AID - 10.1080/10256010410001671014 [doi]
PST - ppublish
SO  - Isotopes Environ Health Stud. 2004 Jun;40(2):115-28. doi: 
      10.1080/10256010410001671014.