I made a quick map with worldpainter and had a suprising result the map is really cool and has some great Caverns.

There is Diamond ore close to surface atone end of the island.



Included is only a map which shows where a small is;and is that had the giant cavern underneath on picture 2.

The Map is for download as a zip so use 7-Zip or other program to place it in the saves folder.