After your reach 300 in mining, it is now time to go into BRD, UBRS, LBRS or MC and acquire dark iron ore. If you haven't been trained upon smelting it make sure you go into BRD to become trained from one of the ghost in the chamber with the seven ghost. Then if you are any form of blacksmith acquire the patterns from within these places and make the items. Good luck though it take 8 dark iron ore to make one bar.