ABC Report: Toxic water from old mine entering Sydney's drinking catchment, research warns
KEY REPORT FINDINGS
"Median concentrations of nickel (430 ug/L), manganese (12667 ug/L) and zinc (1400 ug/L) are at extremely high levels
89% of aquatic insects sampled in the vicinity of discharge have been wiped out (Ephemeropetera, Plecoptera and Trichoptera species)
Overall pollution has increased despite the mine's closure in 2013
Other contaminants include high levels of acidity, salinity, iron and sulfates."