I believe that the accident you are referring to is the 1912Jan10 Kemmerer No.4 mine accident in which six were killed. A newspaper article about the accident my be found at:http://www3.gendisasters.com/taxonomy_menu/2
“Gendisasters” Click the state on the left, then Mining Explosions and Accidents on the right
I also have the federal summary of the accident (no names) if interested.
“Mining Accidents U.S., Canada, New Zealand and Australia”