Metal stall is way out of whack.
Sell 4 iron bars for only 500 sovereigns? Better to hunt and fish than to mine.
I concur. In my opinion, the true path to "human-ness" isn't mining materials for your craftsmen, but selling them to pay OTHER races craftsmen.
That's my understanding of the human theme as well. It's all about economics as opposed to the eudaimonia of perfect craftsmanship of the dwarves, or the oneness of nature with the elves.
There are certain basic goods which form a starter economy and would be needful in any fort in any environment:
1. Agricultural - meat (fish), hides, plants, food, alcohol, lumber
2. Ores - raw ores, processed bars, potentially stone, but certainly lignite, peat, anthracite should be highly valuable. gems should be worth a lot, lot more
3. processed goods - clothing, armor, weapons
I think the agricultural has been tweaked to a pretty good balance now. Meat is definitely appropriate, fish is still good but it's more appropriate to reflect the proper labor cost. Plants are near balanced, though some distinction should be made between above ground and underground crops, with underground being more valuable. I haven't figured out how to sell cooked food (if you even can) and alcohol is a great money-maker if you are in a biome where you can farm.
Ores and bars are not at all yet balanced. With the numbers the way they are now, there would be no "in theme" reason for the human race to ever expand outside of the fertile biomes. Humans will endure all sorts of hardships to create a settlement in a gold-rich area, or silver, or even iron. Even copper is worth a lot, and since those are non-renewable resources on any map, they should be a lot more valuable than the renewable resources like meat, fish, and plants.
I would suggest the following:
2 copper/lead/tin unprocessed ores sell for 500 sovereigns
1 iron sells for 500
1 silver sells for 1000
1 gold sells for 1500
Processed into bars, they sell for a lot more:
1 copper/lead/tin bar for 500
1 iron for 1000
1 silver for 1500
1 gold for 2500
Marble stone is dang near perfect, but I'd cut the number in half. 2 marble stones for 500. Marble is the stone of kings and mighty palaces are built out of it.