The volume of coal mined on the Navajo Nation land has declined in the early 21st century. The Chevron Corporation's P&M McKinley Mine was the first large-scale surface coal mine in New Mexico when it opened in 1961. It closed in January 2010. Peabody Energy's Black Mesa coal mine, a controversial strip mine, was shut down in December 2005 because of its environmental impact and lost an appeal to reopen in January 2010. The Black Mesa mine fed the 1.5 GW Mohave Power Station at Laughlin, Nevada, via a slurry pipeline that used water from the Black Mesa aquifer. The nearby Kayenta Mine used the Black Mesa & Lake Powell Railroad to move coal to the former Navajo Generating Station (2.2 GW) at Page, Arizona. The Kayenta mine provided the majority of leased revenues for the tribe. The Kayenta mine also provided wages to those Navajos who were part of its 400 employees. The Navajo Mine opened in 1963 near Fruitland, New Mexico, and employs about 350 people. It supplies sub-bituminous coal to the 2 GW Four Corners Power Plant via the isolated 13-mile Navajo Mine Railroad. Parts of the Navajo Nation acquired the mine and three mines in Montana and Wyoming.