It's always interesting to speculate on how different careers turn. RKO Pictures needed a new B western star because Tim Holt was going in the service. So this guy Mitchum was spotted in one of the Hopalong Cassidy films he played a bit role in and in fact Mitchum had done other parts like Thirty Second Over Tokyo, etc. So he got signed to a long term contract with RKO for this to be the first in a series of B Westerns.
To show how much he was supposed to be a Tim Holt stand-in, Mitch was given Richard Martin who played Chito Rafferty the same part he played as Holt's sidekick. He also got a second sidekick in Guinn Williams. And the billing for Nevada read "introducing Robert Mitchum."
The western itself is standard fare, nothing truly spectacular about it. It's source was a Zane Grey story which is a plus. But even then you could tell the camera loved Robert Mitchum. It's a must for Mitchum fans of which I'm one.
The thing I wonder about though is if William Wellman hadn't spotted Mitchum and given him that career making part in The Story of GI Joe, would Mitch have continued as a B western star with his career petering out in the mid 50s or earlier. Food for thought.