This True Iron Ore farming guide will show you the best places for mining True Iron Ore.
True Iron Ore
Frostfire Ridge is my favorite place to farm True Iron Ore because it's a low-level zone and you can mine most ore without having to kill any mobs.
Talador is also really good, but it's a higher level zone, so lower level players should stick to Shadowmoon or Frostfire.
Shadowmoon Valley is also a good place.