Fastest Mining Exp?

granite alone is best, go there via magic carpet ride to badabin camp -> run south or tele to temple via the camle ammy and then run se.

 

I'd say mine iron or granite until 80, and then mine concentrated gold in Living Rock. The experience isn't bad and you'll make around 49 mil going from 80-99.

 

Granite is the fastest possible xp in mining.