Northern Dynasty Minerals dropped 7.69% to 78 cents on Friday.
The U.S. Environmental Protection Agency is proposing to invoke a little used provision that may block Pebble Mine from being built.
On Friday the EPA said that it is seeking comment on issuing regulation 404(c) whereby the ". . . EPA is authorized to prohibit or restrict fill activities if a project would have unacceptable adverse effects on fishery areas." The EPA said the provision is used "sparingly" with major projects that have "significant impacts."
The EPA said it is issuing the 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."