Koehler Coal Camp opened up in the early 1900's,ghost town by 1924 or so.(I had an uncle born there) I've never read of a major accident in Koehler, but no doubt daily accidents were a way of life.
You might check the death records here:
http://newmexicoalhn.net/colfax/
or the NM death records on familysearch.org for the fellow you seek. Deaths were not recorded "officially" in the NM until about 1919--but sometimes you get lucky!