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. Author manuscript; available in PMC: 2015 Aug 15.
Published in final edited form as: Sci Total Environ. 2014 May 24;490:456–466. doi: 10.1016/j.scitotenv.2014.04.126

Figure 6.

Figure 6

Dissolved metals and other water quality parameters in (a) mine drainage discharge and (b) mine waste pile runoff from the 1980s and 2000s (current study). Comparisons between 1980s and 2000s data were evaluated using the Mann-Whitney U test. Significance level: * (p<0.05), ** (p<0.01), *** (p<0.001), n.s. (not significant). SpC = specific conductance, ANC = acid neutralizing capacity. In the absence of ANC data, alkalinity data were used when available. Statistical comparisons were not conducted for Fe, Pb, and Ni in MWP runoff due to data limitations described in text.