By Ben Otto 
 

JAKARTA, Indonesia--Thousands of workers at Freeport Indonesia's massive mining operations in eastern Indonesia called off a strike Friday after the company suspended five managers in the wake of a deadly underground accident last month, although the mining giant's production operations remain at a standstill.

Union leaders representing three-quarters of Freeport's workforce of more than 24,000 said earlier this week that they would strike if the company took no action against five officials deemed responsible for the collapse of an underground tunnel that killed 28 miners.

Union leader Virgo Sallosa said Friday that the strike had been canceled after Freeport said the officials wouldn't be active at the mine site during an ongoing investigation of the accident.

In a release, the company said it had "reached an agreement" with union leaders and that workers would return to work maintenance activities at its mines in a remote, mountainous region of Papua in easternmost Indonesia.

The site is home to the massive Grasberg mine, one of the world's largest open-pit copper mines and the largest gold mine.

Production at all mines in the area has been halted since the accident May 14, with workers currently carrying out only maintenance duties until investigations into the accidents are completed. The accident occurred near Freeport's largest underground mine in the area, outside of production areas.

Freeport initially said it was suspending production operations out of respect for the deceased workers and that it hoped to resume work quickly, but the government has said production can't continue until investigations are completed, which could take months.

The company has declared force majeure to free itself from obligations to deliver copper concentrate.

Freeport Indonesia's parent company, the Phoenix-based Freeport-McMoran Copper & Gold Inc., said this week that the halt was causing a production loss of 3 million pounds of copper and 3,000 ounces of gold a day.

It has estimated lost production at 80 million pounds of copper and 80,000 ounces of gold for the May 15-June 11 period.

Deden Sudrajat in Jakarta contributed to this story.

Write to Ben Otto at ben.otto@dowjones.com

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