Tried to find it in my current universe. The "Geo Survey Complete" message is caught by the "System Events" Filter. And at least the "Accessibility Increase" message by the "Population Summary Events" Filter. Couldn't find a mineral increase, but I'm not sure if I had one. (subsequently: I had two lucky ground geo surveys in a row, the same "Population Summary Events" filter catches additional minerals, and the event type is "New Mineral Deposit"; that's the same as for space-based geo-survey finds, only, those are filtered by "Fleet-based Events" apparently.) The log gets laggy when I have to go very far back.