Workers at a Campbell County mine are celebrating a safety milestone.
Cloud Peak Energy says its Cordero Rojo Mine, located about 20 miles south of Gillette, has operated for more than one million consecutive work hours without a single Mine Safety and Health Administration reportable injury.
The mine employs 590 workers and is the third largest coal mine in the U.S. It produced 36.7 million tons of coal last year.
Mine managers say one of their core values is safety and the employees know how to stay careful when using massive machinery.
"It's a cultural thing. You try to drive the culture of safety and if you live that way both at work and at home you've got a lot better chance of achieving zero injuries," said the mine's general manager Joe Vaccari.
Cloud Peak officials say the Spring Creek Mine in southern Montana has also gone more than one million work hours without an injury.