Ten workers have been rescued alive following the accident yesterday at US firm Freeport-McMoRan's Grasberg, one of the world's biggest gold and copper mines high in the mountains of rugged Papua province.
Freeport said it had also discovered that another worker had escaped from the tunnel unharmed when the accident happened. The worker initially failed to inform authorities, a source close to the rescue effort told AFP.
"Rescuers recovered another body from the debris at 2:50 am local time (2320 IST)," Freeport Indonesia, the local subsidiary of the US firm, said in a statement.
The tunnel was part of an underground training facility and not one of the mining areas. Those inside at the time of the accident were direct employees and contract workers attending a safety training course.
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Freeport Indonesia head Rozik Soetjipto arrived at the mine today to talk to rescuers and relatives of the dead, as operations remained suspended after a shutdown the previous day to show sympathy with those affected.
The company has given no indication when operations will resume, or what might have caused the accident.
In 2011, a three-month strike by thousands of workers at Grasberg crippled production, and only came to an end once management agreed to a big pay hike.
The industrial action sparked a wave of deadly clashes between police and gunmen around the mine, with at least 11 people, all Indonesians, killed.