A union leader says about 10,000 workers at the huge Freeport mine in Indonesia's Papua region are to strike for a month from next week in protest at a series of fatalities.
Four people were killed in September in the latest accident at the huge Grasberg mine when a giant haulage truck flattened a car.
Hundreds of workers staged a protest over the deaths at the start of this month, blockading the entrance and forcing a temporary suspension of operations.
A union official, Albar Sabang, has told AFP that anger among workers has peaked after a series of incidents at Freeport.
He says they blame management failures and want 54 management-level staff removed.
Grasberg has been plagued by accidents and production problems in recent years.
In the worst, in May last year, a training tunnel collapsed killing 28 miners.