This Elementium Ore farming guide will show you the best places for mining Elementium Ore.
I must also mention that Pyrite Deposits are rare spawns of Elementium Deposits in Uldum and Twilight Highlands.
Twilight Highlands the best zone for farming Elementium Ore.
Uldum is a great alternative if someone is already farming at Twilight Highlands.
IMPORTANT! If you are level 120, you will see the patch 8.3 version of Uldum. You can talk to Zidormi to switch between the new and old low-level phase of Uldum. (if you open the map, she will be marked with a white text bubble at Ramkahen)