Mine officials say 11 others are believed buried under the rubble.
The Big Gossan underground training facility at the PT Freeport Indonesia mine collapsed last week when 38 workers were undergoing safety training. Ten injured miners were rescued.
The company said in a statement today that recovery efforts were continuing around the clock.
Mining operations at the Grasberg mine, owned by Phoenix, Arizona-based Freeport-McMoRan Copper and Gold Inc, have been suspended since the accident to pay respects to the victims and to concentrate on the recovery effort.