Leo Heller 
Earth: the Salvage Game [EPUB ebook] 
Lunacy and Lobotomy in the Leadbelt

When Charles, a 72 year old retired truck driver arrives in Farmington to try to find his son, who had been committed to the local mental institution 40 years ago, he runs into a strange meth addict who promises to help him find his son, dead or alive. He finds himself in graveyards late at night and in abandoned lead mines, but the truth emerges when he enters a log cabin inhabited by an old man with no tongue, an old man who despises his new-found friend. When he discovers a strange group of people living in an abandoned mine, his life will never be the same.