WASHINGTON, Sept. 9 -- The U.S. Department of the Interior issued the following news release: * * * Wyoming's Black Butte Mine Expansion Approved, Extending Operations Through 2039 * WASHINGTON - The Department of the Interior has approved a mining plan change for the Black Butte Mine in Sweetwater County, Wyoming. The change allows the Black Butte Coal Company to recover about 9.2 million tons of federal coal in two new areas, known as Pit 15 and Pit 10. The Black Butte Mine has operated   more