FILE - In this July 13, 2007, file photo, workers with the Pebble Mine project test drill in the Bristol Bay region of Alaska, near the village of Iliamma. A proposed gold and copper mine at the headwaters of the world's largest sockeye salmon fishery in Alaska would cause "unavoidable adverse impacts," the U.S. Army Corps of Engineers said in a letter to the developer released Monday, Aug. 24, 2020. The corps is asking the backers of Pebble Mine to come up with a mitigation plan within 90 days for nearly 3,000 acres of land and nearly 200 miles of streams it says could be affected if the controversial mine moves forward. (AP Photo/Al Grillo, File)
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