Cesium (Cs) Central, page-5

and just following through on Sinclair Mine in WA (which according to Edison report of Nov'19 had "depleted this year"

https://wcsecure.weblink.com.au/pdf/PIO/02242421.pdf





and the most important bit



Now this is a different product again .... Cesium Oxide ...

And of course the Chinese (Sinomine - same mob who acquired Tanco from Cabot) have also sown up this source of supply.

And Pioneer Resources (PIO) became Essential Metals (ESS) in Aug 2020 (focus on Lithium)



This is a really good, quick read article
https://investorintel.com/markets/technology-metals/technology-metals-intel/cesium-a-critical-metal-and-an-opportunity-for-avalon-advanced-materials/