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In this photograph taken on May 24, 2013 rescue and safety officials from Freeport-McMoRan's US gold and copper mining company accompanied by a representative from Indonesia's Ministry of Energy and Mineral Resources seal a tunnel entrance to the accident site at Big Gossan area at the Grasberg complex following rescue operations where 28 workers were killed and 10 rescued. Indonesia has ordered a halt in operations at a giant US-owned mine while inspectors probe a fatal tunnel collapse, an official said June 2, 2013, in a stoppage that could last two months. On May 14, a tunnel caved in at Freeport-McMoRan's gold and copper Grasberg mine in Indonesia's easternmost Papua province, killing 28 of 38 workers undergoing safety training. AFP PHOTO / TJAHJO ERANIUS (Photo credit should read TJAHJO ERANIUS/AFP via Getty Images)