Very nice

My only criticism is that you didn't properly set the height of the 'Visible area' (the blue rectangle) and that the veins at the top of the map overlap part of a water cliff, part of a river and also the tree group.
Also take in mind that there are no units capable of harvesting the veins in DTA, so you're best off disabling their growth (Edit>Basic>Growing Veins: no).

Other than that I'd say it's perfect; so I'll definitely add this one to the mod as well