WRIGHT, Wyo., Nov. 30 /PRNewswire-FirstCall/ -- Thunder Basin Coal Company's Black Thunder mine surpassed 571 days and 4.0 million employee-hours without a single lost-time injury on Nov.

WRIGHT, Wyo., May 14 /PRNewswire-FirstCall/ -- Thunder Basin Coal Company's Black Thunder mine near Wright, Wyoming, surpassed 365 days and 2.5 million employee-hours without a single lost-time safety incident on April 28, 2009. During that time, Black Thunder's 1,200 employees have produced more than 8 percent of the annual U.S.

ST. LOUIS, Sept. 27 /PRNewswire-FirstCall/ -- The U.S. Department of the Interior's Office of Surface Mining (OSM) has honored one of Arch Coal's mines for its exemplary interaction, communication and involvement with the surrounding communities.