FILE - In this Aug. 9, 2010 file photo, a drill machine being used to try to contact 33 trapped miners stands in the distance in Copiapo, Chile. Chile marks on Sunday, Aug. 5, 2012 the two year anniversary since 33 miners were trapped in the mine that collapsed and trapped them for 69 days before their rescue. (AP Photo/Luis Hidalgo, File)

Associated Press
FILE - In this Aug. 9, 2010 file photo, a drill machine being used to try to contact 33 trapped miners stands in the distance in Copiapo, Chile. Chile marks on Sunday, Aug. 5, 2012 the two year anniversary since 33 miners were trapped in the mine that collapsed and trapped them for 69 days before their rescue. (AP Photo/Luis Hidalgo, File)
FILE - In this Aug. 9, 2010 file photo, a drill machine being used to try to contact 33 trapped miners stands in the distance in Copiapo, Chile. Chile marks on Sunday, Aug. 5, 2012 the two year anniversary since 33 miners were trapped in the mine that collapsed and trapped them for 69 days before their rescue. (AP Photo/Luis Hidalgo, File)
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