What did you find?
If no gallite, berthranite, gold, palladium, platinum, osmium, silver and so on are present you are maybe in the outer ring.
If that is the case you need to go into supercruise again and land very close to the planet. The rings are seperated by a thin gap. Sometimes hard to see.
If you are in the correct ring, you just got bad luck.
Painite heaven... well the ore is rare and maybe randomly distributed. So I could have been lucky.
But if you got the metals I mentioned above in that ring, there is Painite. I garantee that.