This 1942 photo of a copper mine in Utah is pretty cool:
http://www.shorpy.com/node/8945?size=_original
If you look carefully at the terraced slope in the background, you can see at least 8 short ore trains pulled by small, center-cab electric locos like the one on the bridge in the foreground. Also, there is a steam loco in the lower right corner, with the tender of another loco in front of it.
In the lower left corner is a small church, and what appear to be a couple houses, as well as portions of other buildings. Kind of surprising to see these so close to the workings of the massive open-pit mine.