I found the following information in my search of my Wyoming mining accident database:

Date of Accident / Name of Victim / Age / Mine or Location / F=fatal or N=nonfatal / Reference Source / Page / Report Year

1908 BURTON, F C HANNA F W2B 1
1895MAR20 BURTON, HENRY RED CANYON F gend
1908MAR28 BURTON, JOHN HANNA No.1 N W2A
1908MAR28 BURTON, JOSEPH HANNA No.1 F W9
1970AUG BURTON, W H CASPER N 74 71 1970

If any of the above are of interest to you, get back with me. I do have a little more information about these specific accidents.

A newspaper article about the 1895 accident can be found at
http://www3.gendisasters.com/taxonomy_menu/2 “Gendisasters”

From Jerry,
http://www.genealogy.com/users/s/h/e/Jerry-Sherard/ “Mining Accidents U.S., Canada, New Zealand and Australia”