Bank mine copper until level 21, buy a mith pick axe. Do the same to level 31, and to level 41.
At level 41 get a rune pick axe and powermine iron at rimmington to 99 F2P.
Or bank mine iron in P2P, like yanille. 20k xp/hr + 150k gp/hr.
1-41 M1D1 on copper or tin (at least on f2p where there's more competition, you will get beat to too many iron ores to make iron ore faster at 15.)
41-80 M1D1 on iron (as f2p I used varrock east but there's a big risk of getting reported. As p2p I think near argdougne or however you spell it.. you can tell i'm not a member )
80-99 Banking concentrated gold ores at the living rock cavern. This is however a p2p only method, but it's worth it since it makes you at least 30 million gp in the process. If you are f2p just M1D1 iron all the way to 99 from 41.