Speaking of the "Largest undeveloped Lithium rich, Tantalum deposits in the World, can't forget Niobium and of course the old Rin Tin Tin Deposit, plus a few others ( Icing on the AVZ cake ) especially as,
The 2020 list confirms 26 of the 2017 CRMs.
Three CRMs in the 2020 list were not considered as critical in the 2017 list: Bauxite, Lithium and Titanium.
* Fwiw, Well worth a look if you haven't already imo !
Study on the EU's list of Critical Raw Materials
(2020) Final Report
https://rmis.jrc.ec.europa.eu/uploads/CRM_2020_Report_Final.pdf
*To Remind
Food for thought
Frank