A strike that has shut down operations at northern Chilean copper mine Escondida, the world's biggest, entered its fifth day on Monday with few signs of an imminent resolution.
Workers began a strike at the BHP Billiton-run mine on Thursday to put pressure on the company after contractual wage talks failed to end in agreement.
The union has said its 2,500 members are committed to action and is threatening a two-month stoppage, leading BHP last week to swiftly declare force majeure, an admission that it will not be able to meet its contractual obligations.
In two months' time, a new Chilean labor law kicks in that may strengthen the union's hand.
On Sunday, BHP said installations had been attacked by hooded protesters.
Union spokesman Carlos Allendes on Monday called the company's statement a "distraction." The union said late on Sunday that it had acted within the law in its handling of the strike and facilities, and that a peaceful march without incident had taken place on Saturday.
"The situation is the same," said Allendes. "There has been no rapprochement."