I wasn't able to find an obituary for Daniel Christen. Do you know his cause of death?
Looking at the 1920 U.S. Federal census, Daniel, Pearl and Pearl's three children are living in Bingham, Salt Lake, Utah. Daniels' occupation is "Miner".
Maybe Daniel was an employee of the "Calumet and Arizona copper Mining Co." in Bisbee, Arizona and worked the company mines in Cananea, Sonora Mexico. The company also mined silver.
All of the articles in various newspapers regarding the Calumet mining co. show it was a prosperous and safe mine, the last accident was 4 years prior to 1925.
I did not find anything for other mining companies in Arizona that related to accidents.