A foreign-backed miner has sued Chile to block State-run Codelco from exploiting a lithium deposit where both have claims, according to a lawsuit filed in March that will be carefully watched by potential investors being courted by the country’s new government. The little-known and remote Maricunga salt flat is far smaller than the expansive Salar de Atacama, where top lithium producers Albemarle and Chile’s SQM rule supreme.