The European country holds between 1.2 to 1.4 million tonnes of lithium, located mostly around the tiny village of Cinovec, on the border with Germany.
The firm, the world's largest primary silver producer and Mexico's second-largest gold miner, said output of the grey precious metal hit 13.5 million ounces in the quarter.
The miner said decision was unrelated to Elliott Management's call earlier this month to unlock shareholder value by spinning off about $22 billion of BHP's US oil assets.
The Morila operation continues to deliver value in its post-mining phase while progressing plans to develop the site into a commercial agricultural hub after its closure in 2019, Randgold Resources chief executive Mark Bristow said at an on-site media briefing today.
Shareholders voted overwhelmingly in favour of the cash takeover, which will make the South African firm the world's No.3 palladium producer and No.4 platinum group metals miner.
BMI Research expects prices to continue sliding for at least the next five years on rising supplies from Australia and Brazil and expectations for a surplus.