The owners of the Grasberg mine in Indonesia's Papua province have denied there were complaints about a part of the mine operations before it collapsed last month.
The world's biggest gold mine and second-biggest copper mine remains shut for repairs after the disaster in the training facility claimed 28 lives.
A separate accident at the Freeport McMoran-run mine two weeks ago killed a truck driver.
A mine worker, Darmawan Puteranto, says staff often complained about hearing falling rocks above the training facility which caved in.
A Freeport spokeswoman, Daisy Primayanti, says she's heard nothing about this, and that results from the government's investigation are still pending.
She says repairs and maintenance are being carried out over a large area.
"In general the facilities that we have, are in general stable, and it's safe for people to have activities there but there are also areas that are still closed for further inspection."