WOW Gold 50 smithing

Go to Falador's east bank. Outside you can say selling steel bars 600gp each,WOW Items Database, or there is always someone buying them (it may be 550each though) 500 steel bars is roughly 300k.

and coal ores are used up. You should now have 500 steel bars. You may now proceed to world 1 if you do not wish to continue mining to get more to sell.

You can try to better way to make even more money from mining. This requires 60 mining, 50 smithing, and 43 magic. Enter the mining guild and mine mithril rocks.