Fastest method to bank iron ores I think would be to have a lot of rings of dueling, teleport to dueling arena and run to the chasm mine where there are three iron rocks there. When your inventory is filled up just teleport to castlewars and repeat the process. If this method doesn't suite you then I think the next fastest way to bank iron is to use the mine near port khazard. All you need to do is run north out of Yanille bank until you get to the mine, mine your ores and then run back to the bank. Any kind of energy potion would probably speed up the runs more but they aren't neccessary.