A Chilean mining contract worker was shot dead on Friday as a labor strike against state-owned copper company Codelco stretched into its fourth day, the union representing the workers said. The Confederation of Copper Workers, or CTC, posted a statement on its website saying that contractor Nelson Quichillao had been shot and killed while protesting near Codelco's Salvador mine in northern Chile.  The union blamed the shooting on police who had been ordered in to unblock roads...The CTC has blocked roads and set up barricades at Codelco projects around the country after contract workers affiliated with the union went on strike Tuesday to demand the right to negotiate a benefits package similar to that offered to direct Codelco employees…Codelco has suspended all operations at its Salvador mine…Codelco said this week that increasing benefits for contract workers was "not compatible" with current market conditions…