Today, Diné (Navajo) community organizations Tó Nizhóni Ání and Black Mesa Water Coalition, along with Sierra Club, filed a notice of intent (NOI) to sue Peabody Western Coal Company, a subsidiary of Peabody Energy, for failing to disclose the upcoming closure of its Kayenta coal mine in its permit renewal application. The 44,000-acre Kayenta coal mine is on track to end operations when the Navajo Generating Station (NGS) -- the mine’s only customer -- closes on December 22, 2019.