So I managed to survey everything in the Sol system with Nuclear Thermal tech (except for two distant comets), I sent survey teams to every rock that had any minerals at all...
And those survey teams discovered nothing. Well, 1 discovery of a .1 deposit on Venus. Nothing else, in the entire system was found by my Geo Teams.
Fortunately, there is enough ore in the system to keep me busy.
And fortunately I noticed that the last two comets were actually out of my surveyor range, so my surveyors didn't gallivant over to them and have no way to get back.