I'd recommend "going west young man" and mine ores in the mountain tile and selling them to the Thalassar market when prices are good. Its a better source of income than hoping random herbs and ruin pots/chest spawn in nearby. Just run from the giant Slimes and Golems as they will mess you up without good gear.
(to Dev) On the note of building I'd like to add that I've had a minor issue with rocks/boulders respawn in the walls and flooring of my expanded shed house. I assumed after building on top of the area they'd not respawn on top of the building, or not at all since we can get plenty of rocks in the mountains.