Here is the article.
Tasmania's lakes among most contaminated in the world
These are not next to mines nor down stream but up in the elevated mountains, they are polluted from airborne sources from the mines over a 100 km away.
They are Lead, Arsenic, Copper and Cadmium. All from mining and far away from the source.
This is a ANU study from one of the worlds experts, so is very credible not propaganda before Storchy asks.