How do I find good mining spots?

I have a mining laser and a fault tracker and want to do some mining. However, most asteroid fields I come across only have worthless Metallic Ore with a few pieces of Obtainium. The only exception was an ice field which had some more vaulable stuff.

How do I find places that have more valuable materials? Is there a way to spot them without having to scan every minable asteroid individually to find out if there is anything valuable in the area?

Solution 1:

If you find the hackable transmitters flying around, about one in three times they tell you the location of mining spots. I haven't tried to quantify it, but my sense is they are better than the ones you find randomly. You do usually have to fight a few enemies when you arrive.