Hi,
Thorium isn't a Rare Earth Element consequently it is not on the chart.
Jack Lifton has included Thorium in his Rare Metals list of metals produced with worldwide production of less than 32 million tons per year.
I am working through these and will eventually have several mini-sites dealing with them.
Australian Rare Earths
Australian Lithium
Australian Uranium
Australian Vanadium
Australian Gold
Australian Tantalum