...or is this a feature?
Sometimes, when you prospect, you get the 'ol familiar pie chart arrow. So when you follow the arrow and prospect again in the direction indicated, instead of another arrow or even the "appears to be" message, you get no minerals found. What gives? Is this a bug or are you just screwing around with us poor prospectors again?
I got high-ass exploration and good quality rustroot, so issue is not about the rr range.