Calico ghost town is located on a relatively step hillside. It's not far from Death Valley and very arid. There is one shot of the coach traveling through Joshua trees, that's closer to Calico. However, most of the shots, including all of those that illustrate building/town infrastructure, appear to us to have been shot nearer to the Saugus/Newhall area of Southern California. Perhaps Corriganville? Through the decades there were several "Movie Ranches" in this general area. Most of the terrain in the film looks correct for the area. Regrettably, during the past thirty to forty years most of the sets were burned to the ground during various wildfires. https://en.wikipedia.org/wiki/Corriganville_Movie_Ranch