Here's how I did it. First, I went to one of the starting areas and mined copper until I hit level 65. At that point I could mine tin, lesser bloodstone and incendite. Good supplies of tin can be found in Loch Modan (alliance). Incendite is found in some caves in the Wetlands and bloodstone in some caves in eastern Arathi. I just mined these until I hit 125. I then mined iron until I hit 175, the level for mithril. You basically have to mine mithril until you hit level 230. Arathi is a good area for iron. Most of my mithril I got from The Charred Vale in STM. It's one of the best areas for mining that I've found. You can basically loop in circles and get copper, tin, iron, mithril and some truesilver.