This article put pond production efficiency at 50%
https://dxi97tvbmhbca.cloudfront.net/upload/user/image/Ezama-Hoyos-Cortegoso-Braun-Spent_Brine_Disposal-TMW_Presentation20191129232043047.pdf
This one accuses ponds of killing yaks. Think of the yaks.
https://www.wired.co.uk/article/lithium-batteries-environment-impact
This one is harsh puts pond recovery rate at 30%
https://www.innovationnewsnetwork.com/direct-lithium-extraction-boost-lithium-mining-efficiency/26283/
This one says 30% but gives hope that new filtering technology could improve the recovery rate
https://www.mining.com/filtering-technology-increases-speed-recovery-rates-from-lithium-brines/
