The Chilkat Indian Village of Klukwan and three environmental conservation groups are appealing a decision from the federal District Court in Alaska to the U.S. Court of Appeals for the Ninth Circuit.

They say that the Bureau of Land Management (BLM) violated the National Environmental Protection Act when it approved Constantine Metal Resources’ mining exploration projects.

Chilkat Indian Village tribal council president Kimberley Strong said the issue is a matter of survival. “The river feeds…