REUTERS/ Police used tear gas against striking subcontractors and arrested 16 on the second day of strikes at the the open pit Collahuasi mine, one of the world's largest copper deposits.
Subcontractors are employed by foreign and local companies that provide services ranging from catering to transportation and mine excavation. They usually get lesser benefits and salaries than their full-time peers. A prolonged protest could push up copper prices that plunged this week on Greek debt contagion fears.
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