Two closed mines on islands in Babine Lake are leaking dangerous levels of copper that could be damaging the Skeena watershed’s most valuable sockeye salmon spawning lake, The Tyee has learned.

In a report due out this week, SkeenaWild Conservation Trust and the Lake Babine Nation say an analysis of monitoring data from mine owner Glencore shows wastewater from the mines has included elevated levels of heavy metals, including copper contamination up to 20 times greater than provincial water quality guidelines.