Ore Hunting and Farming

After you do John's 2nd JQ, you can't redo the 1st anymore. It depends what ores you are looking for. 1st JQ is minerals (except gold). 2nd JQ is jewels (except diamond and bc).

I'm pretty sure it depends on the level when completed on the Ore/Mineral prize. I think Diamond/Gold/BC are 45+.

Also, I remember getting quite a few Lidium's from Scorpion's when I trained there on my Brawler.