The CALUMET & HECLA EMPLOYMENT RECORDS are not on line. I have several mining records, but not William James Boase.
All the C&H employment records are at :
Michigan Technological University
1400 Townsend Drive
Houghton, Michigan 49931-1295
You might call or write them to do a search for you and you can have them copied for a fee.
Hope this helps....
Pat Korby Dickow