You believe this??
I lived it - Fished AK for 10 years and other places for 20 more. The run off from chemical gold mining operations is deadly, and no matter what, chemical gold mining ponds (arsenic) always find a way into the water table, and to the rivers where the salmon spawn, and then to the sea - killing every thing it its wake.
You likely never farmed, ranched, logged, or fished so when people who live it try to tell you what happens in the real world to us, to animals its often difficult to believe.