Contained in…

Container	Area	Drop Chance
Hakkari Thorium Vein	Zul'Gurub	Very Low (3% - 14%)
Ooze Covered Rich Thorium Vein	Silithus	Very Low (3% - 14%)
Ooze Covered Thorium Vein	Feralas	Extremely Low (1% - 2%)
Rich Thorium Vein	Alterac Valley	Very Low (3% - 14%)
Small Thorium Vein	Felwood	Extremely Low (1% - 2%)
Small Thorium Vein	Blasted Lands	Extremely Low (1% - 2%)
Small Thorium Vein	Alterac Valley	Extremely Low (1% - 2%)