Lithium X are the operations at Salar de Los Angeles (NE of SdV) - I believe they were acquired by a HK group called NextView New Energy Lion Hong Kong Limited last year.
One of the directors of Lithium X Paul Matysek was also one of the founders of Lithium One who as some ppl may be aware, originally secured and explored the SdV project area before merging with Galaxy in 2012.