JUNEAU, Alaska (AP) — Build-out of a large-scale mine near the headwaters of a world-class salmon fishery in Alaska could wipe out as many as 90 miles of streams and alter flows in other waterways, the U.S. Environmental Protection Agency said in a revised assessment released Friday.

The report said mining activity would claim at least 24 miles of streams in the Bristol Bay region, based on the scenarios evaluated, with the loss of wetlands ranging from 1,200 to 4,800 acres.