Transport/Scoping Study Build Up, page-17

It takes about 2 minutes to research such things........
Salar de Uyuni

https://www.dw.com/en/bolivias-evo-morales-plans-lithium-mining-offensive/a-39727810
"According to the US Geological Survey, the Salar de Uyuni salt flats in the country alone contain nine million tons of lithium, over a quarter of the world's known reserves. In total, Bolivia is estimated to possess about half of the world's lithium."

https://wealthminerals.com/investors/lithium-101/
"The extremely large Salar de Uyuni in Bolivia has a lithium grade in excess of 400 mg/l, but the Mg/Li ratio is 18.6, which is three times higher than the smaller Salar de Atacama in Chile."

If the ratio of Mg/Li was 1:1 instead of 18.6:1 in the Salar de Uyuni, all the hard rock resources in the world would be worthless.