In the forest and hills I get alot of ore in the quest for getting Kelbi horns for the armorer and going up into the cave there is a place in the cave (1) and on the cliff on the outside of the cliff (2) and if you go to the top left hand side of your map at the top of the waterfall above the giant log (3) you can sometimes get ore and even get or a few times under the giant log. You will get alot of disk stone and stone but these can be effective in making Disk S ammo and other ammo. The ore will accumulate over time.