Freeport-McMoRan Copper & Gold has resumed operations at its Grasberg mine complex in Indonesia, which was shut down following a tunnel collapse that killed 28 people.
Operations were suspended at the complex on May 14 when a nearby underground training facility collapsed.
Open pit mining and concentrating activities have now resumed at the complex, following government approval and the completion of investigation by state officials.
Freeport, however, is yet to restore underground operations of the complex and is in talks with government authorities to do so.
The mine had originally resumed production on 28 May, amid strong objections from a workers' trade union seeking complete investigation on the accident.
A few days later, one worker was killed in a separate accident, prompting both government and the workers' union to call for a temporary shutdown at the Grasberg mine complex.
The six-week closure of the complex is estimated to have cost Freeport about 52,000t of copper and 115,000oz of gold.
Papua-based union spokesman Juli Parorrongan told Reuters that workers are now returning to work at the Grasberg mine.
"What we are doing now is mainly maintaining the mine and equipment because it has been left by workers for a period of time," Parorrongan added.
Image: The Grasberg Open Pit, originally a 4,100m-high mountain, has been mined down to 3,000m. Photo: Alfindra Primaldhi.