Was using the GE yesterday and I checked prices of some crap that could easily be autoed.

Came across Copper ores, they're like 69GP each. And SUPER easy to mine.

So yeah, a copper miner.

Places to mine it:

Rimmington,
Varrock East,
Port Khazard(With a quick box banking function)

And many more places.

The script would be good to raise money for an army, and I THINK, selling them for market price, they will be instantly sold, if not, minimum.