I have a slightly different situation, the skill is pumped weakly, the search distance - 10m, if you find two places and extract from one point, the other disappears and does not reappear if you click search once again. If the disappearing collection points would reappear when you search again and resource tracking would show only available points for mining, then there would be no problems. But for now, mining for me - a continuous series of "nothing found" with rare appearances of resources :)