That means the river should look like this every spring?
Maybe not quite that bright, the mine derived waters have a lot of silt/clay fines in them that tend toward that color.
Look up iron mountain in CA some time, that place was responsible for about 25% of the total metals discharged to surface waters in the US and that water was utilized for drinking and irrigation downstream. It had enormous subterranean surface area (~ 650 miles of tunnels IIRC) and bacteria actually evolved in it to lower the pH to ridiculous levels to free up metals they fed on. You could put a shovel in the water there and come back in a couple hours to a stick.
Yeah, that’s a load of bull.