** Arcadium Lithium's Australia-listed shares LTM.AX climb
as much as 50.5% to A$6.290, marking their biggest ever intraday
pct gain
** Stock hits its highest since early June, top gainer on
the ASX 200 benchmark index .AXJO
** Lithium miner confirms takeover approach from Rio Tinto
RIO.AX , without revealing any financial details
** Reuters had exclusively reported that the companies had
been holding talks, and Arcadium could be valued at $4 bln to $6
bln or higher
** If a deal goes through, it would make Rio the world's
third-largest producer of lithium
** Rio shares last down 1% to A$122.48
** As of last close, Arcadium Lithium's Australia stock was
down 62.7% YTD
(Reporting by Himanshi Akhand in Bengaluru)
((Himanshi.Akhand@thomsonreuters.com;))