Temporal variation in discharge chemistry and portal flow from the 8-Level adit, Lynx Mine, Myra Falls Operations, Vancouver Island, British Columbia |
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| Authors: | Alexandre J Desbarats Gavin C Dirom |
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| Institution: | (1) Geological Survey of Canada, 601 Booth St., ON, Ottawa, BC, K1A 0E8, Canada;(2) Boliden-Westmin Ltd., PO Box 8000, Campbell River, BC, V9W 6E6, Canada |
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| Abstract: | The 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. |
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| Keywords: | Acid mine drainage Metal loading Hydrograph Chemograph Specific conductance Regression Vancouver Island |
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