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TitleTemporal variation in discharge chemistry and portal flow from the 8-Level adit, Lynx Mine, Myra Falls Operations, Vancouver Island, British Columbia
AuthorDesbarats, A J; Dirom, G C
SourceEnvironmental Geology vol. 47, 2005 p. 445-456,
Alt SeriesGeological Survey of Canada, Contribution Series 2003320
PublisherSpringer Nature
Mediapaper; on-line; digital
File formatpdf (Adobe Acrobat Reader)
ProvinceBritish Columbia
AreaMyra Falls; Vancouver Island
Lat/Long WENS-126.0000 -125.5000 49.7500 49.5000
Subjectshydrogeology; environmental geology; mineral deposits; copper; lead; zinc; sulphide deposits; tailings; tailings analyses; groundwater; groundwater pollution; groundwater regimes; groundwater discharge; acid drainage; acid mine drainage; base metals; leaching, heavy metal; heavy metals contamination; hydrographs; hydrography; regressions; conductivity; water analyses; water geochemistry; water quality analyses; water quality; Lynx Mine
Illustrationsplots; graphs; sketch maps
Released2004 10 15
AbstractThe Lynx mine, currently inactive, has produced copper and zinc concentrates from massive sulfide deposits on a lease within the rainy, mountainous interior of Vancouver Island. Tailings, used to back-fill a mined-out stope, are being leached by percolating groundwater and the resulting acidic, metal-laden drainage is discharging from the portal of the 8-Level adit. Temporal variations in the flow rate, specific conductance and temperature of the discharge were monitored continuously over a 2-year period while effluent chemistry was sampled weekly. Conductivity was relatively constant throughout most of the year but peaked with the first autumn storm events as accumulated soluble sulfide oxidation products were flushed from the workings. Concentrations of sulfate and most metals were closely correlated with conductivity as were low pH values as stored acidity was released along with dissolved species. Variations in pH controlled the speciation and partitioning of metals between dissolved and particulate phases.