If you are asking about ghost building on anything, then shift left click is forced building, it will ignore anything in the way and just place the ghost down. If however you are specificaly asking about the stone mine, then that is a mod that lets you place ghosted mines with specifications you can set that determine how the mine gets build up and it will try to do so as efficiently as possible. See the descriptions of my video's for all mods used.
6 min in. You ghosted onto the stone... how did you do that?
If you are asking about ghost building on anything, then shift left click is forced building, it will ignore anything in the way and just place the ghost down.
If however you are specificaly asking about the stone mine, then that is a mod that lets you place ghosted mines with specifications you can set that determine how the mine gets build up and it will try to do so as efficiently as possible.
See the descriptions of my video's for all mods used.