Really fun game, exactly the type of strategy and optimization I enjoy. However, I was a little annoyed with the placement mechanics. It seemed totally random,and I had a really hard time figuring out the strategy for that. On top of it, what was a good spot seemed to change randomly and for no reason. instead of being an interesting mechanic, this was mostly aggravating.
There was also a problem that I think was a bug - when the digging time was over on the expedition, I was unable to move the items from the dig site to the side bar, despite the game saying that I could. I lost a lot of valuable artifacts because of that.
Overall, I really enjoyed the game mechanics and ideas behind it, there are just a couple of kinks to iron out that might make it more enjoyable to play.