My great grandfather worked as a zinc miner in Ottawa County during the 1920's. He was born in Missouri in the 1872. He was married to a Cora E. Postlewait and had several children, Jessie, Alma, Blanche, Alfred & Hayes. Cora shows up on a census in 1930 in Los Angeles where she spent the rest of her life. We are trying to figure out what happened to Hayes. His family thinks he either died in a mining disaster or of lung cancer associated with mining. He mined in Missouri, Kansas and Oklahoma. Other than his birthday we know nothing about him. Any information would be very helpful. Thank you, Rachael H.