Alva Review-Courier -

JUNEAU, Alaska (AP) — The U.S. Environmental Protection Agency took an unusually strong step Tuesday and blocked a proposed mine heralded by backers as the most significant undeveloped copper and gold resource in the world because of concerns about its environmental impact on a rich Alaska aquatic ecosystem that supports the world's largest sockeye salmon fishery.

The move, cheered by Alaska Native tribes and environmentalists and condemned by some state officials and mining interests, deals a heavy blow to the proposed Pebble Mine. The intended site is in a remote area of southwest Alaska's B...