Río Tinto : a western story
(Book)

Wil Chama gained his reputation as a gunman and sought to bury himself as a driver of a salt wagon in Río Tinto, Texas. What Wil never suspected is that he was engaged to work for the Red Devil Salt Works not because of his skill as a muleskinner but precisely because of his reputation as a gunman. This becomes clear to Wil when Randall Kellums, the owner of the Red Devil, tells him he wants Wil to give up his job as a wagoner and instead serve notice on Amos Montoya that his company and his people will no longer have access to the salt deposits at Tinto Flats.