Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Environmental Remediation Obligations [Abstract]    
Total environmental and mine closure obligations $ 218.2 $ 170.8