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Mine cited for violation after a quake-like blast
May 22, 2012 - The Associated Press
CHEYENNE -- Wyoming officials have issued two notices of violation to Cloud Peak Energy Inc. following a blast at the Cordero Rojo coal mine near Gillette that registered on seismographs on the scale of a small earthquake.
No injuries were reported after the blast May 1.
State officials say the blast was so large because explosives adjacent to the blast area were also accidentally set off upon detonation, causing more than the legal limit of explosives to go off.