Ah ha smithing, my expert skill (sort of). If you want to train smithing with mining, just mine addy sets (1 addy ore 6 coal) and then smelt them into bars and make whatever you can make. If you don't want to train smithing with your mining then all you need to do is get say 1k of steel and then go on the marketplace forums (on tip.it) and you will sell plenty of companies that will give you ores + cash for your bars. So then you have more ores to smelt and then you keep on trading.