FILE PHOTO: Technicians from the Orocobre mining company work on an evaporation pond test in the salt flat at Olaroz, 4,000 meters (13,123 feet) above sea level and north of the Argentine province of San Salvador de Jujuy August 7, 2010. Orocobre’s assets are now part of Arcadium Lithium, which global miner Rio Tinto wants to buy. Picture taken on August 7, 2010. REUTERS/Enrique Marcarian/File Photo
