If you want some serious cash, you'd mine Pure Ess..
Look at my youtube for the video I made for it...I got a whip real fast.
(Youtube.com/reavenis)
This took me 2 hours and 32 minutes to make.
If you make your own pure ess, I recommend you at least craft some runes out of them. You'd probably make less money per hour overall but at least that would train another skill than just Mining.
