Christopher Sergeant

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The January 2019 collapse of a dam in Brumadinho, Brazil, sent mining tailings and mud over the landscape for miles, destroying this bridge and killing 300 people. Andre Penner/AP

Mine waste dams threaten the environment, even when they don’t fail

Christopher Sergeant, University of Montana and Julian D. Olden, University of Washington

Dams built to hold enormous quantities of toxic mining waste have a long history of spills. Decisions in the Pacific Northwest threaten three free-flowing rivers there.

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