Alright, prospecting minerals is pretty difficult. While there is a warning that you've already scanned an asteroid, it only works if that asteroid contains the appropriate minerals..

What I would like to see, is already scanned meteors becoming marked while still in that sector. This would reduce the monotany of prospecting while still keeping it challenging.

HOWEVER.. this should be an option only for the mission scanners and other, better scanners.

Suggested before.

But still a good suggestion. I HATE those stupid mining missions.