Why every factory game is about mining/smelting iron and copper? Aren't there more intersting industrial processes?

There are, but I was trying to make the game for a more general audience. I'd be willing to add another game model with more realism, and some more processes too, if you'd be interested. I just don't see much appeal for such games.. If it's liked substantially by a few people, I'll add it as a gamemode, otherwise it feels like catering to a non-existent crowd :/

but, now that you mention it, I'll look into adding it soon, thanks!