March 4, 2019 — A new study commissioned by a Bristol Bay seafood marketing group paints a doomsday scenario if the bulk tailings dam at the proposed Pebble mine ever suffered a catastrophic breach, an outcome the U.S Army Corps of Engineers has called very remote and one the mine developer has taken steps to avoid.
Billions of gallons of mud would smother valley bottoms, covering vast stretches of salmon habitat, according to an executive summary released Friday. Finely ground-up waste material from mining would travel downstream and spill into Bristol Bay more than 200 river miles from the mine site, threatening the valuable salmon fishery.
“Given the fine-grained nature of the material, it is extremely likely that these tailings would continue to Bristol Bay, where they would eventually settle out in the Nushagak River estuary,” the summary says.