Navajo Nation President Jonathan Nez says the tribe will not financially back the bonds a tribal energy company needs for a trio of newly acquired coal mines off the reservation. The Navajo Transitional Energy Company recently bought Montana’s largest …Navajo Nation President Jonathan Nez says the tribe will not financially back the bonds a tribal energy company needs for a trio of newly acquired coal mines off the reservation. The Navajo Transitional Energy Company recently bought Montana’s largest …