No way to harvest minerals...
You can mine there and get both iron ore and minerals, but since minerals are what is in the most demand there, you often don't see any of it. The way to fix this is to mine whatever you see. Go mine all the iron ore nodes and drop it on the ground, and run around and find the minerals. As one is mined, they both appear. Many people don't know this though, and they mine only the one they want, which gradually steps a mine toward a temporary imbalance of resources. Mine 'em all, and watch the mine re-balance itself.