The union representing workers at Chile’s La Escondida copper mine said its members voted to reject the most recent contract offer from the mine’s owner and go on strike, potentially risking disruptions to the supply of a key metal as the world’s economy continues to recover from the impact of the coronavirus pandemic. BHP Group Ltd. -controlled Minera Escondida, located in Chile’s northern Atacama Desert, is the world’s largest copper mine, producing almost 5% of the world’s supply of the metal, which is used to make electrical wiring and motors and in construction, among many other applications. By law, the...