Right after the maintenance tonight I went out and completed my leftover Survey maps. I had two Blacksmith Surveys for the same location and it appears to have consumed them both after only one pickup. I don't think I picked up any additional ore per node and I'm out of Survey maps to check again. I could be wrong though, Lost Treasure showed I had Quantity: 2 when I hovered over the marker, but was only able to pick them once, I checked my inventory and no more Surveys in my bags.