Almost everyone knows this mission is pretty 'hard' and the reward is kinda low so I had the following idea... When you scan a rock, don't say 'xxx not found', but make it report what IS in the rock.

That way, if you get a scan mission with a certain type of ore to be found, you know what to look for.
Ofcourse you could get the same knowledge by asking other ppl who did manage to complete such a scanning mission, but it'd be a pain if ppl keep asking 'where can I find xxx ore in rocks?'

So, just an idea, make a scanner print out what is in a rock (cna even do it with the default target system, target the rock, scan it, then open it's info window) orcourse this could mess up the radar system etc, I don't know :)

If not that, then maybe the mission info could have a little picture inset of the kind of roid that generally carries the ore (like the sharp-edged roids that carry the ferric ore)