it would be a Big Help to you if you focus your DD on Chemtall, owned by ROC---its a lot of work, and Chemtall has subs too, also, check to see the Ownership pf ROC and the recent Add-Ons---it gave me the view of "something's UP" and its good

Production
The U.S. Geological Survey (USGS) collects domestic
production data for lithium from a voluntary canvass of U.S.
operations. The single U.S. lithium carbonate producer, Chemetall
Foote Corp. (a subsidiary of the German company Chemetall
GmbH, which is owned by Rockwood Holdings, Inc., of
Princeton, NJ), responded to the survey, representing 100% of
total production. Production and stock data were withheld from
publication to avoid disclosing company proprietary data (table 1).
Chemetall Foote produced lithium carbonate from brines
near Silver Peak, NV. The company’s other U.S. lithium
operations included a lithium hydroxide plant in Silver Peak; a
butyllithium plant in New Johnsonville, TN; and facilities for
producing downstream lithium compounds in Kings Mountain,
NC. Chemetall Foote’s subsidiary in Chile, Sociedad Chilena de
Litio Ltda., produces lithium carbonate from a brine deposit.
FMC Corporation’s Lithium Division produced a full range
of downstream compounds, lithium metal, and organic lithium
compounds at its facilities in Bessemer City, NC, and Bayport,
TX. FMC met its lithium carbonate requirements with material
produced at its Argentine operation, and, through a long-term
contract, Chilean producer Sociedad Química y Minera de Chile
S.A. (SQM) agreed to supply FMC with lithium carbonate