Talk to Sir Eamos Woreld. Say that you want the ability to mine white ore and make white bars. Sir Eamos Woreld will say to go to Lumbridge Castle to talk to the cook. Go to Lumbridge Castle and talk to the cook. Say that you want to discover the in-depth secrets of the Smithing and Mining abilities of a minority of White Knights. Go back to the White Knights Castle and talk to Sir Renitee. He will say to go to Ardougne. Go to the bank of Ardougne, where there will be a brick wall. Climb it.