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Freeport-McMoRan Copper & Gold says 15 people have been killed and 56 injured in shootings at its open-cut Grasberg mine in Indonesia since July 2009.
According to Bloomberg the company said 32 shooting incidents in almost as many months were hampering mining operations at its joint venture operation with Rio Tinto.
The company said shooting victims included its employees, contractors, members of law enforcement, and civilians.
The Grasberg mine in Papua has long been troubled by violence, with separatist groups in the region fighting for political independence.
The mine has also been criticised in the past for human rights violations and environmental damage.
According to Bloomberg the company halted production and shipments from Grasberg earlier this month after employees protested wage agreements settled last year.
Workers have also been unhappy with safety on-site, and previously stopped work over the issue.
Freeport said the identity and motivation of the shooters was "unknown" but it had tried to take "precautionary measures".
It said it was using secured convoys on the road and the Indonesian Government had sidelined "additional security forces" for the region.
Grasberg is home to the world’s largest known gold deposit and second largest copper reserves.
Rio Tinto is the second largest investor in the project.
Nevertheless civil strife has hit production hard, with the company reporting an 18 per cent hit to copper production and a 71 per cent drop in gold output in January.
According to Bloomberg Freeport’s chief financial officer Kathleen Quirk said the company would be "reviewing its numbers" for the mine.