Unless ore is 60g+ stack i wouldn't bother selling the ore straight up. Just prospect it and sell gems etc. There's a plugin or bot or something that automates prospecing. ProfessionBuddy i think.
Prospect, use lesser gems for rings or necklaces - vendor greens, AH blues that proc. Use higher gems to transmute Primal Diamond, AH thesem and vendor leftovers. I normally sell 15-20 primal diamonds a day - they go for 0,8-1,1K on my server.