I found this throwback video on YouTube produced for Western Lithium that describes the lithium extraction process. The details appear to be a bit outdated as they are not all consistent with the PFS for Thacker Pass, but it provides a decent overview of the different steps in the process and what additional products can be made that will offset the cost of production. This is definitely not the best video, but putting it in context it shows how the process for extracting lithium has evolved in a relatively short period of time. 

https://youtu.be/Xl76aNZCvck

AXP