The U.S. Army Corps of Engineers plans to prepare a supplemental environmental impact statement (SEIS) for the Donlin Gold Mine. This SEIS is the result of the legal victory by six Southwest Alaska Tribes who challenged the legality of the mine’s federal permits in the U.S. District Court in Alaska.

Specifically, the notice posted on Jan. 26, 2026, says the SEIS will “evaluate the impacts of a larger tailings spill” from the permitted gold mine. Following the completion of the SEIS, the federal permitting agencies will decide whether to “modify, reaffirm or rescind” the existing federal permits authorizing the project.

Importantly, the Army Corps announcement is accompanied by a short public comment period that began Jan. 26 and will continue through Feb. 24, 2026.