Workers at Freeport-McMoRan's huge copper and gold mine in Papua in Indonesia will continue a strike into next month after rejecting a 35 per cent pay rise.
The Financial Times reports the company had offered to increase wages from one dollar US to one dollar 35 cents.
About 8,000 workers have been on strike since September the 15th, pressing for higher wages and better working conditions.
The strike has sparked violence with eight people reported to have been killed within the vicinity of the mine.
Last month, following the shootings, Freeport shut down production, which the company says is costing it millions of dollars a day.
The decision by union leaders to prolong the strike puts additional pressure on Freeport which is also being pushed by Indonesian authorities to renegotiate its contract and pay the government more revenue.
Workers had initially sought seven dollars 50 an hour but earlier this week cut this to four dollars.