The resources on asteroids are really packed together sometimes. Twice now I've placed the auto-extractor on an exotic minerals deposit but also on a rare metals deposit, and the extractor starts with the rare metals. The second time it happened I tried and tried to not be on both but the amount of not flat terrain prevented me from being out of range of the rare metals. Need to be able to either pick what resource to mine, or set a priority list, or something like that.