Rio's Jadar Project is an unconventional type of lithium deposit, more details see the Haytley report and RIO's website.
There's no comparison to AVZ's Manono, size, high grade, shallow and tin & tantalum by products, imo.
www.globalgeo.com.au/wp-content/uploads/2017/05/Brokers-Report-Hartleys-24-05-2017.pdf
http://www.riotinto.com/media/media-releases-237_22865.aspx