This is definatly the best place to farm copper vein, run to the green spots and when you're done with that they should have respawned.
Good thing about this is that you can farm them without almost no downtime, and they're close to eachother.
So stick to the green spots and don't forget to go inside the cave and up on the mountain. But there's also veins outside the green spots, ofcourse.
OH and you can kill the mobs to get linen cloth, that's always some extra money! The droprate is pretty high.