The U.S. Environmental Protection Agency Region 10 is issuing a proposal to protect one of the world’s most valuable salmon fisheries, in Bristol Bay, Alaska, from the risks posed by large-scale mining at the Pebble deposit. Science has shown that development of this mine, which is backed by Northern Dynasty Minerals and the Pebble Limited Partnership, would be one of the largest open pit copper mines in the world and would threaten one of the world’s most productive salmon fisheries. EPA Region 10 is seeking public comments on the proposal.