(Bloomberg) -- A deadly explosion at a Chinese-owned facility in Indonesia has highlighted the hidden costs of Jakarta’s ambitious bet on battery metal processing to accelerate industrial development, a signature policy of outgoing leader Joko Widodo.Most Read from BloombergIslamic State Claims Responsibility for Deadly Iran BlastsJust a Billion Doesn’t Cut It on This Exclusive Florida IslandBusiness Insider Says Ackman’s Wife Plagiarized Doctoral ThesisTech’s Losing Streak Extends Ahead of Jobs