Feds : Violations by Utah mine 's operator led to 2007 collapse that killed six . Score: 6 Mine operator fined more than $ 1.5 million .
Feds : Violations by Utah mine 's operator led to 2007 collapse that killed six . Bad design , improper mining led to Crandall Canyon collapse , feds say . Mine operator fined more than $ 1.5 million .