Is there a balance pass on the ores planned? I've generated a number of worlds with default settings and am always finding opulent abundance of ores. For example near my camp are near a dozen surface chalcopyrite veins within 200 blocks. From a single one (which I haven't depleted), I've found 70+ ingots worth of ore.
Maybe reduce the value of it's nuggets even more? It is currently 2.5 units/per nugget, it could be dropped down even more, making it something that's okay to start with, but you want to find better types of ore asap, then come back later with bombs if you really need more copper.
Just a thought, could be applied to other ore types too.
