Mount Polley mine’s tailings dam had already exceeded the maximum height authorized under its environmental certificate when it experienced a catastrophic failure more than a decade ago, lawyers for Xatśūll First Nation told B.C.’s Supreme Court this week. Amanda Follett Hosgood reports. Amanda reports on northern B.C. for The Tyee. Published July 27, 2025. https://thetyee.ca/News/2025/06/27/Mount-Polley-Dam-Exceeded-Authorized-Height/