Chilean state mining giant Codelco's incoming chief executive Ruben Alvarado has a mammoth task ahead of him: boosting copper output from its lowest level in 25 years, reining in ballooning costs, and spearheading a state push into battery metal lithium. Alvarado, 64, will start as CEO on Sept. 1 after a search to replace the outgoing Andre Sougarret, who abruptly announced in June he would step down, citing personal reasons and "complexities" running the world's largest copper producer. Alvarado, a chemical engineer, joined Codelco as a graduate in 1984, but for the last...