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\bibitem{Pettit_etal1999} Pettit, C. M., Scharer, J. M., Chambers, D. B., Halbert, B. E., Kirkaldy, J. L., \& Bolduc, L. (1999). Neutral mine drainage. In D. Goldsack, N. Belzile, P. Yearwood, \& G. J. Hall (Eds.), \textit{Sudbury {\textquoteright}99; mining and the environment II; Conference proceedings}. Sudbury: Sudbury Environmental.

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