Two of my favourites, and you'll struggle to find two more contrasting films about the same theme, the Gold Rush..
McCabe & Mrs Miller (1971) ... The most realistic portrayal of life at the time i've ever seen in a western, a dark brooding epic of a film, don't expect sunshine and roses.. also starring Julie Christie, directed by Robert Altman and music by Leonard Cohen, what more do you need ..
https://youtu.be/F2BSHp9oYD0
An excellent Guardian review from 1999. https://www.theguardian.com/culture/.../artsfeatures1
And Paint Your Wagon, for pure and simple hokum entertainment value.
https://youtu.be/lBYlM3R9ExA