The Rifters by M. Pax
Summary: A junction between the worlds erupts.
The Gold Rush trickles to a fool’s quest and a string of stagecoach heists. In 1888, Earl Blacke decides to make a new start and become a better man. He escapes into the mountains, heading north. In the wilds of Oregon, a rift inside an ancient volcano opens and sends him into the future, into the present day. It also shaves forty years off his age, forty years to live over again and atone for what he’s done.