Canadian gold mine spill raises fears among Alaskans on the Yukon

A cyanide spill at a major gold mine in the Yukon Territory — high in the Yukon River watershed — has sparked widespread concern in Canada.

But Alaska salmon advocates say the mishap isn’t just a problem for Yukoners: The spill happened upstream of a tributary of the Yukon River. The Yukon is Alaska’s biggest transboundary waterway, and residents along its shores who have depended on salmon for generations are already suffering amid crashes of multiple species.

Officials on both sides of the border say it’s too early to know the full impact of the spill, which happened in late June. And they’v...