Calling mining pollution that’s existed for many decades an emergency now might seem a stretch. But participants in a transboundary mining conference in Juneau this week say there are circumstances — including recent natural and industry disasters — showing why a heightening of longstanding concerns is justified.

“I think that people are realizing that more and more this is an emergency situation,” Esther Aaltséen Reese, president of the Southeast Alaska Indigenous Transboundary Commission, said in…