What Jestex and Siv are saying is correct. There is going to be an ore refresher that we are calling cave-ins. We are still working it out and therefore did not include it in the SP Beta.I thought, that the adventure maps are intended to be played without mining.
Right now there is no ore to be found in Sivania or the Lost Cavern's of Odin's Fjord. Once we have the cave-in logic fully implemented all types of ore will be generated (with conditions based on maps/locations).Let me guess we can only find Silver here.