Thousands of workers at Freeport-McMoran’s gold and copper mine and port in Indonesia’s Papua region are on strike.
Their union says some 90 percent of the mine’s staff have gone on strike, asking for an increase in the hourly minimum wage from $US2.10 to US$17.5 per hour.
The strike had already delayed around 133,000 tonnes of copper ore concentrate shipments on Friday.
Six vessels are now awaiting copper ore cargo to be delivered to smelter plants in Indonesia, China, the Philippines and Japan.
The Indonesian government says the strike is potentially cutting output of 230,000 tonnes of ore daily. Workers have threatened to strike for a month.