Northern Dynasty Minerals Ltd. unit Pebble LP is looking at reducing the footprint of its Pebble copper-gold project in Alaska to about 5.4 square miles.
The development scenario under consideration includes eliminating the primary mine operations in the Upper Talarik watershed region and constructing enhanced tailing storage facilities with improved safety.
Pebble LP President and CEO Tom Collier said the Pebble mine would not use cyanide in the recovery process "in order to respond to stakeholder concerns."
Potentially acid-generating tailings would be separated from other tailings, and all tailings storage would be consolidated to the North Fork Koktuli area.
Additionally, the Pebble mine would be designed to withstand seismic activity, Collier said.
In mid-July, the U.S. Environmental Protection Agency started a process to withdraw a proposed determination it issued under the Clean Water Act in 2014 that would have restricted development of the Pebble project.