Thorium Ore farming
This Thorium Ore farming guide will list the places where I was able to farm the most amount of Thorium in the least amount of time. There are a two types of Thorium Veins you will encounter on these routes, small and rich. Rich Thorium Veins requires a mining skill of 215 while the Small ones requires 200. I would recommend to get your mining up to 215 before you start farming Thorium Ore.
I believe Winterspring is the best place for mining Thorium, there is so much Rich Thorium veins in this zone. You could actually just go off the route that I recommend and you will still find Thorium everywhere.
The reason I like Un'Goro is because of the layout of the zone, one big loop around the zone and that's it. It's so easy to farm there.
Silithus is also an excellent place to farm Thorium. There are bunch of caves filled with bugs, don't go inside them. If you go inside the caves you will have to fight mobs and you will get dismounted. You might also get lost in those caves because it is hard to find out.
These are the best zones if you want to farm Thorium Ore. Once you are done mining Thorium, go to my Fel Iron Ore Farming page!