Black Thunder Thermal Coal Mine, Wyoming .
The Black Thunder thermal coal mine, located in the Southern Powder River Basin of Wyoming, opened in 1977 and for many years was the largest single coal operation in the world. It is also the first coal mine in the world to transport one billion tons of coal. Having in 2004 been relegated to secondlargest, after Peabody''s North AntelopeRochelle operation, also in the Powder River Basin ...