There are a couple of layers of flashback here, and the voiceover done by the modern hero (William Price, who has a real “Aw gee, ma, there’s gold!” air about him) is weirdly hyperactive, almost to the point of parody at times. The inner story is the most interesting one, because it’s all about Ida Lupino running roughshod over Glenn Ford and Gig Young; together they almost made it worth watching.
Also: Edgar Buchanan and Glenn Ford were in at least 9 movies together. I know they both worked a ton, but that’s like 10% of Buchanan’s output which seems really high — I hope the liked one another, or at least got along. Otherwise, that would have been a drag.