Oh, the “easy” way to increase the chance of having a belt: always pop the anoms in connected holes. I do it even when I am just daytripping - because I know that if I want higher chance of ore anom being there in the next hole that connects to my area then popping the anoms in the one connected to my area is the way to do it. It’s no guarantee - just a small increase in the chances of ore anom spawning in the hole that may connect to my area. [it is less likely that the same hole connects to your area twice in a row, but even if that happens they won’t despawn that fast]