The EPA issued a final determination last week, banning the local disposal of dredged waste from building and operating the mine. This dumping would have "unacceptable adverse effects" on local waters, including around 100 miles of streams and 2,000 acres of important breeding grounds for the bay's salmon, per the agency. "The Bristol Bay watershed is a vital economic driver, providing jobs, sustenance and significant ecological and cultural value to the region," says EPA Administrator Michael Regan in a statement. "With this action, EPA is advancing its commitment to help protect this one-of-a-kind ecosystem, safeguard an essential Alaskan industry, and preserve the way of life for more than two dozen Alaska Native villages."