This guide shows you one or more of the best and most efficient routes to farm Thoriumerz and is exactly what you need if you want to farm this ore yourself instead of spending your gold on it.
You need Mining 250 to gather this ore (at least the small veins).
If you have never gathered ore before and you want to know how to level Mining fast and easy, take a look at our Classic Mining Leveling-Guide!
Winterspring is most likely the best zone to farm Thoriumerz. You may not even have to follow this route to get a lot of Thorium.
I hope you had fun with this guide!
You can send me suggestions for improvement or mistakes in my GoldGoblin Discord.